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  • highlight navigation PHP

    - by Kira
    I've launched a website a while back and successfully used Javascript + CSS to highlight the current page on the navigation. However, it is not working in Safari and it does not validate well, when using Javascript, so I decided to have PHP assign the CSS id to the HTML elements. So far, it works fine, compared to the other times where there was two of each link displayed, when it was attempted in PHP. My problem is that all links look normal and the CSS property is not applied. I have a feeling that it has to do with my PHP code, but I'm not certain. The site address is here As for the PHP code, here it is: <?php echo('<li><span class="bold">Main</span>'); echo('<ul>'); if ($page=="home") { echo('<li><a id="current" href="index.shtml">Home</a></li>'); } else { echo('<li><a href="index.shtml">Home</a></li>'); } if ($page=="faq") { echo('<li><a id="current" href="faq.shtml">FAQ</a></li>'); } else { echo('<li><a href="faq.shtml">FAQ</a></li>'); } if ($page=="about") { echo('<li><a id="current" href="about.shtml">About Bryce</a></li>'); } else { echo('<li><a href="about.shtml">About Bryce</a></li>'); } echo('<li><a href="contact.php">Contact Bryce</a></li>'); if ($page=="sign guestbook") { echo('<li><a id="current" href="sign.shtml">Sign Guestbook</a></li>'); } else { echo('<li><a href="sign.shtml">Sign Guestbook</a></li>'); } if ($page=="view guestbook") { echo('<li><a id="current" href="view.shtml">View Guestbook</a></li>'); } else { echo('<li><a href="view.shtml">View Guestbook</a></li>'); } echo('</ul>'); echo('</li>'); echo('<li><span class="bold">Info</span>'); echo('<ul>'); if ($page=="projects") { echo('<li><a id="current" href="projects.shtml">Projects</a></li>'); } else { echo('<li><a href="projects.shtml">Projects</a></li>'); } if ($page=="books") { echo('<li><a id="current" href="books.shtml">Books</a></li>'); } else { echo('<li><a href="books.shtml">Books</a></li>'); } echo('</ul>'); echo('</li>'); echo('<li><span class="bold">Misc.</span>'); echo('<ul>'); if ($page=="cover designs") { echo('<li><a id="current" href="coverdesigns.shtml">Cover Designs</a></li>'); } else { echo('<li><a href="coverdesigns.shtml">Cover Designs</a></li>'); } echo('<li><a target="_blank" href="http://www.lulu.com/brycecampbellsbooks">Lulu Store</a></li>'); echo('<li><a href="rss/">RSS</a></li>'); echo('</ul>'); echo('</li>'); ?> In order to give you guys an idea of what the highlighting effect should look like, here is the CSS that is supposed to be applied to the current page: #current { font-style: italic; text-decoration: none; color: #000000; } When looking up what I was doing wrong, it told me that I was implementing it right, but it does not seem that the PHP is getting the values.

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  • The best cross platform (portable) arbitrary precision math library

    - by Siu Ching Pong - Asuka Kenji
    Dear ninjas / hackers / wizards, I'm looking for a good arbitrary precision math library in C or C++. Could you please give me some advices / suggestions? The primary requirements: It MUST handle arbitrarily big integers (my primary interest is on integers). In case that you don't know what the word arbitrarily big means, imagine something like 100000! (the factorial of 100000). The precision MUST NOT NEED to be specified during library initialization / object creation. The precision should ONLY be constrained by the available resources of the system. It SHOULD utilize the full power of the platform, and should handle "small" numbers natively. That means on a 64-bit platform, calculating 2^33 + 2^32 should use the available 64-bit CPU instructions. The library SHOULD NOT calculate this in the same way as it does with 2^66 + 2^65 on the same platform. It MUST handle addition (+), subtraction (-), multiplication (*), integer division (/), remainder (%), power (**), increment (++), decrement (--), gcd(), factorial(), and other common integer arithmetic calculations efficiently. Ability to handle functions like sqrt() (square root), log() (logarithm) that do not produce integer results is a plus. Ability to handle symbolic computations is even better. Here are what I found so far: Java's BigInteger and BigDecimal class: I have been using these so far. I have read the source code, but I don't understand the math underneath. It may be based on theories / algorithms that I have never learnt. The built-in integer type or in core libraries of bc / Python / Ruby / Haskell / Lisp / Erlang / OCaml / PHP / some other languages: I have ever used some of these, but I have no idea on which library they are using, or which kind of implementation they are using. What I have already known: Using a char as a decimal digit, and a char* as a decimal string and do calculations on the digits using a for-loop. Using an int (or a long int, or a long long) as a basic "unit" and an array of it as an arbitrary long integer, and do calculations on the elements using a for-loop. Booth's multiplication algorithm What I don't know: Printing the binary array mentioned above in decimal without using naive methods. Example of a naive method: (1) add the bits from the lowest to the highest: 1, 2, 4, 8, 16, 32, ... (2) use a char* string mentioned above to store the intermediate decimal results). What I appreciate: Good comparisons on GMP, MPFR, decNumber (or other libraries that are good in your opinion). Good suggestions on books / articles that I should read. For example, an illustration with figures on how a un-naive arbitrarily long binary to decimal conversion algorithm works is good. Any help. Please DO NOT answer this question if: you think using a double (or a long double, or a long long double) can solve this problem easily. If you do think so, it means that you don't understand the issue under discussion. you have no experience on arbitrary precision mathematics. Thank you in advance! Asuka Kenji

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  • AJAX Password Change without Refresh

    - by Richard
    I'm trying to implement password change functionality into my website. I've got all the password changing script, validation, etc done. But now I need to prevent the page from going to the script page or refreshing. When the user clicks the submit button, I want nothing to change except a message displaying successfully changed or error. So here's my html: <form id="change_Pass" action="" method="post"> Current Password<input type="password" id="change_password" name="change_password"><br> New Password<input type="password" id="new_password" name="new_password"><br> Verify Password<input type="password" id="verify_password" name="verify_password"><br> <input type="submit" value="Submit" id="change_pass_submit"> </form> And my jquery: $('#change_pass_submit').click(function(){ var $this = $(this); $.ajax({ data: $this.serialize(), // get the form data type: "POST", // GET or POST url: "/Private/change_password.php", // the file to call success: function() { // on success.. //$('#success_div).html(response); // update the DIV alert("good"); }, error: function() { // on error.. //$('#error_div).html(e); // update the DIV alert("bad"); } }); return false; //so it doesn't refresh when submitting the page }); And my php: <?php session_start(); require_once '../classes/Bcrypt.php'; ini_set('display_errors', 'On'); error_reporting(E_ALL | E_STRICT); $usr = $_SESSION["username"]; $old_pwd = $_POST["change_password"]; $new_pwd = $_POST["new_password"]; $new_pwd = Bcrypt::hash($new_pwd); try { $link = new PDO('mysql:host=*;dbname=*;charset=UTF-8','*','*'); $query = "SELECT * FROM Conference WHERE Username = :un"; $stmt = $link->prepare($query); $stmt->bindParam(':un', $usr); $stmt->execute(); $row = $stmt->fetchAll(); $hash = $row[0]["Password"]; $is_correct = Bcrypt::check($old_pwd, $hash); if($is_correct) { $query = "UPDATE Conference SET `Password`=:new_pwd WHERE Username = :usr"; $stmt = $link->prepare($query); $stmt->bindParam(':new_pwd', $new_pwd); $stmt->bindParam(':usr', $usr); $stmt->execute(); return true; } else return false; } catch(PDOException $e) { print "Error!: " . $e->getMessage() . "<br/>"; die(); } But for some reason, when I hit the submit button, the page STILL goes to change_password.php. I have no idea why, i've looked at so many tutorials and my code matches theirs but for some reason mine won't stay on the same page. Where did I go wrong?

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  • Mercurial "hg clone" on Windows via ssh with plink issue

    - by Kyle Tolle
    I have a Windows Server 2008 machine (iis7) that has CopSSH set up on it. To connect to it, I have a Windows 7 machine with Mercurial 1.5.1 (and TortoiseHg) installed. I can connect to the server using PuTTY with a non-standard ssh port and a .ppk file just fine. So I know the server can be SSH'd into. Next, I wanted to use the CLI to connect via hg clone to get a private repo. I've seen elsewhere that you need to have ssh configured in your mercurial.ini file, so my mercurial.ini has a line: ssh = plink.exe -ssh -C -l username -P #### -i "C:/Program Files/PuTTY/Key Files/KyleKey.ppk" Note: username is filled in with the username I set up via copSSH. #### is filled in with the non-standard ssh port I've defined for copSSH. I try to do the command hg clone ssh://inthom.com but I get this error: remote: bash: inthom.com: command not found abort: no suitable response from remote hg! It looks like hg or plink parses the hostname such that it thinks that inthom.com is a command instead of the server to ssh to. That's really odd. Next, I tried to just use plink to connect by plink -P #### ssh://inthom.com, and I am then prompted for my username, and next password. I enter them both and then I get this error: bash: ssh://inthom.com: No such file or directory So now it looks like plink doesn't parse the hostname correctly. I fiddled around for a while trying to figure out how to do call hg clone with an empty ssh:// field and eventually figured out that this command allows me to reach the server and clone a test repo on the inthom.com server: hg clone ssh://!/Repos/test ! is the character I've found that let's me leave the hostname blank, but specify the repo folder to clone. What I really don't understand is how plink knows what server to ssh to at all. neither my mercurial.ini nor the command specify a server. None of the hg clone examples I've seen have a ! character. They all use an address, which makes sense, so you can connect to any repo via ssh that you want to clone. My only guess is that it somehow defaults to the last server I used PuTTY to SSH to, but I SSH'd into another server, and then tried to use plink to get to it, but plink still defaults to inthom.com (verified with the -v arg to plink). So I am at a loss as to how plink gets this server value at all. For "fun", I tried using TortoiseHg and can only clone a repo when I use ssh://!/Repos/test as the Source. Now, you can see that, since plink doesn't parse the hostname correctly, I had to specify the port number and username in the mercurial.ini file, instead of in the hostname like [email protected]:#### like you'd expect to. Trying to figure this out at first drove me insane, because I would get errors that the host couldn't be reached, which I knew shouldn't be the case. My question is how can I configure my setup so that ssh://[email protected]:####/Repos/test is parsed correctly as the username, hostname, port number, and repo to copy? Is it something wrong with the version of plink that I'm using, or is there some setting I may have messed up? If it is plink's fault, is there an alternative tool I can use? I'm going to try to get my friend set up to connect to this same repo, so I'd like to have a clean solution instead of this ! business. Especially when I have no idea how plink gets this default server, so I'm not sure if he'd even be able to get to inthom.com correctly. PS. I've had to use a ton of different tutorials to even get to this stage. Therefore, I haven't tried pushing any changes to the server yet. Hopefully I'll get this figured out and then I can try pushing changes to the repo.

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  • ASP.net User Controls and business entities

    - by Chris
    Hi all, I am currently developing some user controls so that I can use them at several places within a project. One control is a about editing a list of addresses for a customer. Since this needs to be done at several places within the project I want to make it a simple user control. The user control contains a repeater control. By default the repeater displays one address item to be edited. If more addresses need to be added, the user can click on a button to append an additional address to be entered. The user control should work for creating new addresses as well as editing existing ones. The address business entity looks something like this: public class Address { public string Street { get; set; } public City City { get; set; } public Address(string street, City city) { Check.NotNullOrEmpty(street); Check.NotNull(city); Street = street; City = city; } } As you can see an address can only be instantiated if there is a street and a city. Now my idea was that the user control exposes a collection property called Addresses. The getter of this property collects the addresses from the repeater and return it in a collection. The setter would databind the addresses to be edited to the repeater. Like this: public partial class AddressEditControl : System.Web.UI.UserControl { public IEnumerable<Address> Addresses { get { IList<Address> addresses = new List<Address>(); // collect items from repeater and create addresses foreach (RepeaterItem item in addressRepeater.Items) { // collect values from repeater item addresses.Add(new Address(street, city)); } return addresses; } set { addressRepeater.DataSource = value; addressRepeater.DataBind(); } } } First I liked this approach since it is object oriented makes it very easy to reuse the control. But at some place in my project I wanted to use this control so a user could enter some addresses. And I wanted to pre-fill the street input field of each repeater item since I had that data so the user doesn't need to enter it all by his self. Now the problem is that this user control only accepts addresses in a valid state (since the address object has only one constructor). So I cannot do: IList<Addresses> addresses = new List<Address>(); addresses.Add(new Address("someStreet", null)); // i dont know the city yet (user has to find it out) addressControl.Addresses = addresses; So the above is not possible since I would get an error from address because the city is null. Now my question: How would I create such a control? ;) I was thinking about using an Address DTO instead of a real address, so it can later be mapped to an address. That way I can pass in and out an address collection which addresses don't need to be valid. Or did I misunderstood the way user controls work? Are there any best practices?

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  • using xml type attribute for derived complex types

    - by David Michel
    Hi All, I'm trying to get derived complex types from a base type in an xsd schema. it works well when I do this (inspired by this): xml file: <person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Employee"> <name>John</name> <height>59</height> <jobDescription>manager</jobDescription> </person> xsd file: <xs:element name="person" type="Person"/> <xs:complexType name="Person" abstract="true"> <xs:sequence> <xs:element name= "name" type="xs:string"/> <xs:element name= "height" type="xs:double" /> </xs:sequence> </xs:complexType> <xs:complexType name="Employee"> <xs:complexContent> <xs:extension base="Person"> <xs:sequence> <xs:element name="jobDescription" type="xs:string" /> </xs:sequence> </xs:extension> </xs:complexContent> </xs:complexType> However, if I want to have the person element inside, for example, a sequence of another complex type, it doesn't work anymore: xml: <staffRecord> <company>mycompany</company> <dpt>sales</dpt> <person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Employee"> <name>John</name> <height>59</height> <jobDescription>manager</jobDescription> </person> </staffRecord> xsd file: <xs:element name="staffRecord"> <xs:complexType> <xs:sequence> <xs:element name="company" type="xs:string"/> <xs:element name="dpt" type="xs:string"/> <xs:element name="person" type="Person"/> <xs:complexType name="Person" abstract="true"> <xs:sequence> <xs:element name= "name" type="xs:string"/> <xs:element name= "height" type="xs:double" /> </xs:sequence> </xs:complexType> <xs:complexType name="Employee"> <xs:complexContent> <xs:extension base="Person"> <xs:sequence> <xs:element name="jobDescription" type="xs:string" /> </xs:sequence> </xs:extension> </xs:complexContent> </xs:complexType> </xs:sequence> </xs:complexType> </xs:element> When validating the xml with that schema with xmllint (under linux), I get this error message then: config.xsd:12: element complexType: Schemas parser error : Element '{http://www.w3.org/2001/XMLSchema}sequence': The content is not valid. Expected is (annotation?, (element | group | choice | sequence | any)*). WXS schema config.xsd failed to compile Any idea what is wrong ? David

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  • Implement OAuth in Java

    - by phineas
    I made an an attempt to implement OAuth for my programming idea in Java, but I failed miserably. I don't know why, but my code doesn't work. Every time I run my program, an IOException is thrown with the reason "java.io.IOException: Server returned HTTP response code: 401" (401 means Unauthorized). I had a close look at the docs, but I really don't understand why it doesn't work. My OAuth provider I wanted to use is twitter, where I've registered my app, too. Thanks in advance phineas OAuth docs Twitter API wiki Class Base64Coder import java.io.InputStreamReader; import java.io.BufferedReader; import java.io.OutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.URL; import java.net.URLEncoder; import java.net.URLConnection; import java.net.MalformedURLException; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; import java.security.NoSuchAlgorithmException; import java.security.InvalidKeyException; public class Request { public static String read(String url) { StringBuffer buffer = new StringBuffer(); try { /** * get the time - note: value below zero * the millisecond value is used for oauth_nonce later on */ int millis = (int) System.currentTimeMillis() * -1; int time = (int) millis / 1000; /** * Listing of all parameters necessary to retrieve a token * (sorted lexicographically as demanded) */ String[][] data = { {"oauth_callback", "SOME_URL"}, {"oauth_consumer_key", "MY_CONSUMER_KEY"}, {"oauth_nonce", String.valueOf(millis)}, {"oauth_signature", ""}, {"oauth_signature_method", "HMAC-SHA1"}, {"oauth_timestamp", String.valueOf(time)}, {"oauth_version", "1.0"} }; /** * Generation of the signature base string */ String signature_base_string = "POST&"+URLEncoder.encode(url, "UTF-8")+"&"; for(int i = 0; i < data.length; i++) { // ignore the empty oauth_signature field if(i != 3) { signature_base_string += URLEncoder.encode(data[i][0], "UTF-8") + "%3D" + URLEncoder.encode(data[i][1], "UTF-8") + "%26"; } } // cut the last appended %26 signature_base_string = signature_base_string.substring(0, signature_base_string.length()-3); /** * Sign the request */ Mac m = Mac.getInstance("HmacSHA1"); m.init(new SecretKeySpec("CONSUMER_SECRET".getBytes(), "HmacSHA1")); m.update(signature_base_string.getBytes()); byte[] res = m.doFinal(); String sig = String.valueOf(Base64Coder.encode(res)); data[3][1] = sig; /** * Create the header for the request */ String header = "OAuth "; for(String[] item : data) { header += item[0]+"=\""+item[1]+"\", "; } // cut off last appended comma header = header.substring(0, header.length()-2); System.out.println("Signature Base String: "+signature_base_string); System.out.println("Authorization Header: "+header); System.out.println("Signature: "+sig); String charset = "UTF-8"; URLConnection connection = new URL(url).openConnection(); connection.setDoInput(true); connection.setDoOutput(true); connection.setRequestProperty("Accept-Charset", charset); connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=" + charset); connection.setRequestProperty("Authorization", header); connection.setRequestProperty("User-Agent", "XXXX"); OutputStream output = connection.getOutputStream(); output.write(header.getBytes(charset)); BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream())); String read; while((read = reader.readLine()) != null) { buffer.append(read); } } catch(Exception e) { e.printStackTrace(); } return buffer.toString(); } public static void main(String[] args) { System.out.println(Request.read("http://api.twitter.com/oauth/request_token")); } }

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  • CSS: Labels in table columns

    - by hello
    Hello. BACKGROUND: I would like to have small labels in columns of a table. I'm using some implemented parts of HTML5/CSS3 in my project, and this section specifically is for mobile devices. While both facts are not necessarily relevant, the bottom line is that I don't have to support Internet Explorer or even Firefox for that matter (just WebKit). THE PROBLEM With my current CSS approach, the vertical padding of the cell comes from the <span element (set to display: block with top/bottom margins), which contains the "value" of the column. As a result there's no padding when the <span> is empty or missing (no value) and the label is not in place. The "full" coulmns should give you the idea of where I want the labels to be, even if there's no value, and the <span> is not there. I realize that I could use "non-breaking-space", but I would really like to avoid it. I wonder if any of you have a fix / better way to do this? current code is below. Thank you for any help. <!DOCTYPE html> <html lang="en"> <head> <title>ah</title> <style> body { width: 320px; } /* TABLE */ table { width: 100%; border-collapse: collapse; font-family: arial; } th, td { border: 1px solid #ccc; border-width: 0px 0px 1px 1px; } th:last-child, td:last-child { border-right-width: 1px; } tr:first-child th { border-top-width: 1px; background: #efefef; } /* RELEVANT STUFF */ td { padding: 3px; } td sup { display: block; } td span { display: block; margin: 3px 0px; text-align: center; } </style> </head> <body> <table> <tr> <th colspan="3">something</th> </tr> <tr> <td><sup>some label</sup><span>any content</span></td> <td><sup>some label</sup><span>any content</span></td> <td><sup>some label</sup><span></span></td><!-- No content, just a label --> </tr> </table> </body> </html>

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  • jquery-autocomplete does not work with my django app.

    - by HWM-Rocker
    Hi everybody, I have a problem with the jquery-autocomplete pluging and my django script. I want an easy to use autocomplete plugin. And for what I see this (http://code.google.com/p/jquery-autocomplete/) one seems very usefull and easy. For the django part I use this (http://code.google.com/p/django-ajax-selects/) I modified it a little, because the out put looked a little bit weired to me. It had 2 '\n' for each new line, and there was no Content-Length Header in the response. First I thought this could be the problem, because all the online examples I found had them. But that was not the problem. I have a very small test.html with the following body: <body> <form action="" method="post"> <p><label for="id_tag_list">Tag list:</label> <input id="id_tag_list" name="tag_list" maxlength="200" type="text" /> </p> <input type="submit" value="Submit" /> </form> </body> And this is the JQuery call to add autocomplete to the input. function formatItem_tag_list(bla,row) { return row[2] } function formatResult_tag_list(bla,row) { return row[1] } $(document).ready(function(){ $("input[id='id_tag_list']").autocomplete({ url:'http://gladis.org/ajax/tag', formatItem: formatItem_tag_list, formatResult: formatResult_tag_list, dataType:'text' }); }); When I'm typing something inside the Textfield Firefox (firebug) and Chromium-browser indicates that ther is an ajax call but with no response. If I just copy the line into my browser, I can see the the response. (this issue is solved, it was a safety feature from ajax not to get data from another domain) For example when I am typing Bi in the textfield, the url "http://gladis.org/ajax/tag?q=Bi&max... is generated. When you enter this in your browser you get this response: 4|Bier|Bier 43|Kolumbien|Kolumbien 33|Namibia|Namibia Now my ajax call get the correct response, but there is still no list showing up with all the possible entries. I tried also to format the output, but this doesn't work either. I set brakepoints to the function and realized that they won't be called at all. Here is a link to my minimum HTML file http://gladis.org/media/input.html Has anybody an idea what i did wrong. I also uploaded all the files as a small zip at http://gladis.org/media/example.zip. Thank you for your help! [Edit] here is the urls conf: (r'^ajax/(?P<channel>[a-z]+)$', 'ajax_select.views.ajax_lookup'), and the ajax lookup channel configuration AJAX_LOOKUP_CHANNELS = { # the simplest case, pass a DICT with the model and field to search against : 'tag' : dict(model='htags.Tag', search_field='text'), } and the view: def ajax_lookup(request,channel): """ this view supplies results for both foreign keys and many to many fields """ # it should come in as GET unless global $.ajaxSetup({type:"POST"}) has been set # in which case we'll support POST if request.method == "GET": # we could also insist on an ajax request if 'q' not in request.GET: return HttpResponse('') query = request.GET['q'] else: if 'q' not in request.POST: return HttpResponse('') # suspicious query = request.POST['q'] lookup_channel = get_lookup(channel) if query: instances = lookup_channel.get_query(query,request) else: instances = [] results = [] for item in instances: results.append(u"%s|%s|%s" % (item.pk,lookup_channel.format_item(item),lookup_channel.format_result(item))) ret_string = "\n".join(results) resp = HttpResponse(ret_string,mimetype="text/html") resp['Content-Length'] = len(ret_string) return resp

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  • Technology to communicate with someone with expressive aphasia?

    - by rascher
    A family member had a stroke a few years back and now has expressive aphasia. She understands what is said to her, is cognitive of what is going on, but cannot express herself. She is able to respond to yes/no questions (do you want to go shopping? are you looking for your earrings?) She is not, however, able to read (English is not her native language and she hasn't read Hindi for decades.) I am the technologist in the family, and I intend to come up with something to help us communicate. The idea is to have some sort of picture book where she can point to what she wants. My first question: does some sort of assistive technology for people with expressive aphasia already exist? These can be hardware or software devices? If not, then such a software doesn't seem difficult to write. My initial thought is to have an interface with pictures - maybe separated by category (food, shopping) - where she can point to an individual picture to indicate what she needs. We could easily add more items with such a software, and we could have an interface where she (or we) could "flip pages". Which suggests that the best solution would use a touch screen rather than a mouse. It would be really difficult to train her to aim a mouse or find keys on a keyboard. We're thinking of maybe getting a tablet and writing some basic software. But tablets computers are expensive and fragile - I'm not sure if it would be able to stand spills or being knocked about in a nursing home. So my next question: what kind of tablet-like devices are out there which I can program on? I don't know anything about hardware, but if there is something then we could special-order it. What would be safe and durable for such a project? We could do something on an iPod or cell phone, but I feel like that interface would be too small. Finally, does anyone here have experience with this kind of assistive technology? Things I might not anticipate when designing such a system? edit I've added a (pretty hefty!) bounty. I'd kinda like to open this question up to any suggestions, comments, and experiences that people might have. This is a pretty real and important project, so while we will (are working on) a solution, any insights would be particularly helpful. Right now the plan is to mount a screen in her room. We'll either teach her to use a trackball or use a touch-screen panel, after seeing what she is able to use with a simple prototype. Then software akin to an old "hypercard" deck: ---------------------------------------------------------------- | -------------- -------------- | | | Clothes | | Food | ... | | -------------- -------------- | | | | Pic of item 1 Pic of item 2 Pic of item 3 | | | | | | | | | | Pic of item 4 Pic of item 5 Pic of item 6 | | | | | | | | | | <-Back Next-> | ---------------------------------------------------------------- commentcommentcomment!

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  • being able to solve google code jam problem sets

    - by JPro
    This is not a homework question, but rather my intention to know if this is what it takes to learn programming. I keep loggin into TopCoder not to actually participate but to get the basic understand of how the problems are solved. But to my knowledge I don't understand what the problem is and how to translate the problem into an algorithm that can solve it. Just now I happen to look at ACM ICPC 2010 World Finals which is being held in china. The teams were given problem sets and one of them is this: Given at most 100 points on a plan with distinct x-coordinates, find the shortest cycle that passes through each point exactly once, goes from the leftmost point always to the right until it reaches the rightmost point, then goes always to the left until it gets back to the leftmost point. Additionally, two points are given such that the the path from left to right contains the first point, and the path from right to left contains the second point. This seems to be a very simple DP: after processing the last k points, and with the first path ending in point a and the second path ending in point b, what is the smallest total length to achieve that? This is O(n^2) states, transitions in O(n). We deal with the two special points by forcing the first path to contain the first one, and the second path contain the second one. Now I have no idea what I am supposed to solve after reading the problem set. and there's an other one from google code jam: Problem In a big, square room there are two point light sources: one is red and the other is green. There are also n circular pillars. Light travels in straight lines and is absorbed by walls and pillars. The pillars therefore cast shadows: they do not let light through. There are places in the room where no light reaches (black), where only one of the two light sources reaches (red or green), and places where both lights reach (yellow). Compute the total area of each of the four colors in the room. Do not include the area of the pillars. Input * One line containing the number of test cases, T. Each test case contains, in order: * One line containing the coordinates x, y of the red light source. * One line containing the coordinates x, y of the green light source. * One line containing the number of pillars n. * n lines describing the pillars. Each contains 3 numbers x, y, r. The pillar is a disk with the center (x, y) and radius r. The room is the square described by 0 = x, y = 100. Pillars, room walls and light sources are all disjoint, they do not overlap or touch. Output For each test case, output: Case #X: black area red area green area yellow area Is it required that people who program should be should be able to solve these type of problems? I would apprecite if anyone can help me interpret the google code jam problem set as I wish to participate in this years Code Jam to see if I can do anthing or not. Thanks.

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  • Select number of rows for each group where two column values makes one group

    - by Fábio Antunes
    I have a two select statements joined by UNION ALL. In the first statement a where clause gathers only rows that have been shown previously to the user. The second statement gathers all rows that haven't been shown to the user, therefore I end up with the viewed results first and non-viewed results after. Of course this could simply be achieved with the same select statement using a simple ORDER BY, however the reason for two separate selects is simple after you realize what I hope to accomplish. Consider the following structure and data. +----+------+-----+--------+------+ | id | from | to | viewed | data | +----+------+-----+--------+------+ | 1 | 1 | 10 | true | .... | | 2 | 10 | 1 | true | .... | | 3 | 1 | 10 | true | .... | | 4 | 6 | 8 | true | .... | | 5 | 1 | 10 | true | .... | | 6 | 10 | 1 | true | .... | | 7 | 8 | 6 | true | .... | | 8 | 10 | 1 | true | .... | | 9 | 6 | 8 | true | .... | | 10 | 2 | 3 | true | .... | | 11 | 1 | 10 | true | .... | | 12 | 8 | 6 | true | .... | | 13 | 10 | 1 | false | .... | | 14 | 1 | 10 | false | .... | | 15 | 6 | 8 | false | .... | | 16 | 10 | 1 | false | .... | | 17 | 8 | 6 | false | .... | | 18 | 3 | 2 | false | .... | +----+------+-----+--------+------+ Basically I wish all non viewed rows to be selected by the statement, that is accomplished by checking weather the viewed column is true or false, pretty simple and straightforward, nothing to worry here. However when it comes to the rows already viewed, meaning the column viewed is TRUE, for those records I only want 3 rows to be returned for each group. The appropriate result in this instance should be the 3 most recent rows of each group. +----+------+-----+--------+------+ | id | from | to | viewed | data | +----+------+-----+--------+------+ | 6 | 10 | 1 | true | .... | | 7 | 8 | 6 | true | .... | | 8 | 10 | 1 | true | .... | | 9 | 6 | 8 | true | .... | | 10 | 2 | 3 | true | .... | | 11 | 1 | 10 | true | .... | | 12 | 8 | 6 | true | .... | +----+------+-----+--------+------+ As you see from the ideal result set we have three groups. Therefore the desired query for the viewed results should show a maximum of 3 rows for each grouping it finds. In this case these groupings were 10 with 1 and 8 with 6, both which had three rows to be shown, while the other group 2 with 3 only had one row to be shown. Please note that where from = x and to = y, makes the same grouping as if it was from = y and to = x. Therefore considering the first grouping (10 with 1), from = 10 and to = 1 is the same group if it was from = 1 and to = 10. However there are plenty of groups in the whole table that I only wish the 3 most recent of each to be returned in the select statement, and thats my problem, I not sure how that can be accomplished in the most efficient way possible considering the table will have hundreds if not thousands of records at some point. Thanks for your help. Note: The columns id, from, to and viewed are indexed, that should help with performance. PS: I'm unsure on how to name this question exactly, if you have a better idea, be my guest and edit the title.

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  • Servlet stops without giving any exception

    - by Fahim
    Hi, I have implemented a Servlet hosted on Tomcat 6 server on Mandriva Linux. I have been able to make the client communicate with the Servlet. In response to a request the Servlet tries to instantiate a another class (named KalmanFilter) located in the same directory. The KalmanFilter tries to create four Matrices (using Jama Matrix package). But at this point Servlet stops without giving any exception ! However, from another test code in the same directory I have been able to create instance of KalmanFilter class, and proceed without any error. The problem occurs only when my Servlet tries to instantiate the KalmanFilter class and create the matrices. Any idea? Below are the codes: MyServlet.java import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.util.*; public class MyServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ doGet(request, response); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException{ PrintWriter out = null; //response.getWriter(); try{ System.out.println("creating new KalmanFilter"); KalmanFilter filter = new KalmanFilter(); out = response.getWriter(); out.print("filter created"); }catch(Exception ex){ ex.printStackTrace(); System.out.println("Exception in doGet(): " + ex.getMessage()); ex.printStackTrace(out); } } } KalmanFilter.java import Jama.Matrix; public class KalmanFilter { protected Matrix X, X0; protected Matrix F, Q; //protected Matrix F, B, U, Q; protected Matrix H, R; protected Matrix P, P0; private final double EPSILON = 0.001; public KalmanFilter(){ System.out.println("from constructor of KalmanFilter"); createInitialMatrices(); } private void createInitialMatrices(){ System.out.println("from KalmanFilter.createInitialMatrices()"); double[][] pVals = { {1.0, 0.0}, {0.0, 1.0} }; double[][] qVals = { {EPSILON, EPSILON}, {EPSILON, EPSILON} }; double[][] hVals = { {1.0, 0.0}, {0.0, 1.0}, {1.0, 0.0}, {0.0, 1.0} }; double[][] xVals = { {0.0}, {0.0}, }; System.out.println("creating P Q H X matrices in createInitialMatrices()"); try{ this.P = new Matrix(pVals); System.out.println("created P matrix in createInitialMatrices()"); this.Q = new Matrix(qVals); System.out.println("created Q matrix in createInitialMatrices()"); this.H = new Matrix(hVals); System.out.println("created H matrix in createInitialMatrices()"); this.X = new Matrix(xVals); System.out.println("created X matrix in createInitialMatrices()"); System.out.println("created P Q H X matrices in createInitialMatrices()"); }catch(Exception e){ System.out.println("Exception from createInitialMatrices()"+ e.getMessage()); e.printStackTrace(); } System.out.println("returning from createInitialMatrices()"); } }

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  • Analyzing bitmaps produced by NSAffineTransform and CILineOverlay filters

    - by Adam
    I am trying to manipulate an image using a chain of CIFilters, and then examine each byte of the resulting image (bitmap). Long term, I do not need to display the resulting image (bitmap) -- I just need to "analyze" it in memory. But near-term I am displaying it on screen, to help with debugging. I have some "bitmap examination" code that works as expected when examining the NSImage (bitmap representation) I use as my input (loaded from a JPG file into an NSImage). And it SOMETIMES works as expected when I use it on the outputBitmap produced by the code below. More specifically, when I use an NSAffineTransform filter to create outputBitmap, then outputBitmap contains the data I would expect. But if I use a CILineOverlay filter to create the outputBitmap, none of the bytes in the bitmap have any data in them. I believe both of these filters are working as expected, because when I display their results on screen (via outputImageView), they look "correct." Yet when I examine the outputBitmaps, the one created from the CILineOverlay filter is "empty" while the one created from NSAffineTransfer contains data. Furthermore, if I chain the two filters together, the final resulting bitmap only seems to contain data if I run the AffineTransform last. Seems very strange, to me??? My understanding (from reading the CI programming guide) is that the CIImage should be considered an "image recipe" rather than an actual image, because the image isn't actually created until the image is "drawn." Given that, it would make sense that the CIimage bitmap doesn't have data -- but I don't understand why it has data after I run the NSAffineTransform but doesn't have data after running the CILineOverlay transform? Basically, I am trying to determine if creating the NSCIImageRep (ir in the code below) from the CIImage (myResult) is equivalent to "drawing" the CIImage -- in other words if that should force the bitmap to be populated? If someone knows the answer to this please let me know -- it will save me a few hours of trial and error experimenting! Finally, if the answer is "you must draw to a graphics context" ... then I have another question: would I need to do something along the lines of what is described in the Quartz 2D Programming Guide: Graphics Contexts, listing 2-7 and 2-8: drawing to a bitmap graphics context? That is the path down which I am about to head ... but it seems like a lot of code just to force the bitmap data to be dumped into an array where I can get at it. So if there is an easier or better way please let me know. I just want to take the data (that should be) in myResult and put it into a bitmap array where I can access it at the byte level. And since I already have code that works with an NSBitmapImageRep, unless doing it that way is a bad idea for some reason that is not readily apparent to me, then I would prefer to "convert" myResult into an NSBitmapImageRep. CIImage * myResult = [transform valueForKey:@"outputImage"]; NSImage *outputImage; NSCIImageRep *ir = [NSCIImageRep alloc]; ir = [NSCIImageRep imageRepWithCIImage:myResult]; outputImage = [[[NSImage alloc] initWithSize: NSMakeSize(inputImage.size.width, inputImage.size.height)] autorelease]; [outputImage addRepresentation:ir]; [outputImageView setImage: outputImage]; NSBitmapImageRep *outputBitmap = [[NSBitmapImageRep alloc] initWithCIImage: myResult]; Thanks, Adam

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  • wpf display staggered content

    - by Chris Cap
    I am trying to display a rather dynamic list of data in WPF. I have essentially a LineItem class that contains a list of strings and a line type. The line type separates different categories of line items. All line items with the same type should be displayed the same and their data should line up. For example, this list will contain an order summary. And the there will be a line type that represents something with a width and height. The width and height must line up vertically. However, there may be other line types that don't have to line up vertically. I want to produce a table similar to what you see below: ------------------------------------------------------------------ | some content here | some more content here | last content here | |----------------------------------------------------------------| | some content here | | last content here | |----------------------------------------------------------------| | spanning content that is longer then most | last content here | |----------------------------------------------------------------| | some content that can span a really long distance | ------------------------------------------------------------------ I attempted to do this by creating ListView with a single column that had a datatemplate that contained a grid with a fixed number of fields and then bind to the Colspan value. Unfortunately, this didn't work. I ended up with incorrect or overlapping content anytime I tried to do a column span. Here's the XAML I was working with <ListView ItemsSource="{Binding}" > <ListView.View> <GridView> <GridViewColumn Header="Content"> <GridViewColumn.CellTemplate> <DataTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> </Grid.ColumnDefinitions> <TextBlock Grid.Column="0" Grid.ColumnSpan="{Binding Path=Tokens[0].ColumnSpan}" Text="{Binding Path=Tokens[0].Content}" ></TextBlock> <TextBlock Grid.Column="1" Grid.ColumnSpan="{Binding Path=Tokens[1].ColumnSpan}" Text="{Binding Path=Tokens[1].Content}" ></TextBlock> <TextBlock Grid.Column="2" Text="{Binding Path=Tokens[2].Content}"></TextBlock> </Grid> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView> </ListView.View> And here's the classes I was binding to public class DisplayLine { public LineType Linetype { get; set; } public List<Token> Tokens { get; set; } public DisplayLine() { Tokens = new List<Token>(); } } public class Token { public string Content { get; set; } public bool IsEmpty { get { return string.IsNullOrEmpty(Content); } } public int ColumnSpan { get; set; } public Token() { ColumnSpan = 1; } } Does anyone have any suggestions of maybe a way of making this work. I may be taking the wrong approach. I'm trying to avoid any solutions where I explcitily build something in the code behind as I'm using the MVVM pattern so it has to be something that I can bind from exposed through the controller. My intial plan was to create a factory and separate classes that display the data differently based on type. However, I'm struggling coming up with a strategy for this using MVVM as I really can't just build something and display it. I have toyed with the idea of making some kind of UI service class that is injected, but it would still require some pretty detailed UI information from the controller to do it's work.

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  • Need suggestions on how to extract data from .docx/.doc file then into mssql

    - by DarkPP
    I'm suppose to develop an automated application for my project, it will load past-year examination/exercises paper (word file), detect the sections accordingly, extract the questions and images in that section, and then store the questions and images into the database. (Preview of the question paper is at the bottom of this post) So I need some suggestions on how to extract data from a word file, then inserting them into a database. Currently I have a few methods to do so, however I have no idea how I could implement them when the file contains textboxes with background image. The question has to link with the image. Method One (Make use of ms office interop) Load the word file - Extract image, save into a folder - Extract text, save as .txt - Extract text from .txt then store in db Question: How i detect the section and question. How I link the image to the question. Extract text from word file (Working): private object missing = Type.Missing; private object sFilename = @"C:\temp\questionpaper.docx"; private object sFilename2 = @"C:\temp\temp.txt"; private object readOnly = true; object fileFormat = Word.WdSaveFormat.wdFormatText; private void button1_Click(object sender, EventArgs e) { Word.Application wWordApp = new Word.Application(); wWordApp.DisplayAlerts = Word.WdAlertLevel.wdAlertsNone; Word.Document dFile = wWordApp.Documents.Open(ref sFilename, ref missing, ref readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing); dFile.SaveAs(ref sFilename2, ref fileFormat, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing,ref missing, ref missing,ref missing,ref missing,ref missing,ref missing, ref missing,ref missing); dFile.Close(ref missing, ref missing, ref missing); } Extract image from word file (Doesn't work on image inside textbox): private Word.Application wWordApp; private int m_i; private object missing = Type.Missing; private object filename = @"C:\temp\questionpaper.docx"; private object readOnly = true; private void CopyFromClipbordInlineShape(String imageIndex) { Word.InlineShape inlineShape = wWordApp.ActiveDocument.InlineShapes[m_i]; inlineShape.Select(); wWordApp.Selection.Copy(); Computer computer = new Computer(); if (computer.Clipboard.GetDataObject() != null) { System.Windows.Forms.IDataObject data = computer.Clipboard.GetDataObject(); if (data.GetDataPresent(System.Windows.Forms.DataFormats.Bitmap)) { Image image = (Image)data.GetData(System.Windows.Forms.DataFormats.Bitmap, true); image.Save("C:\\temp\\DoCremoveImage" + imageIndex + ".png", System.Drawing.Imaging.ImageFormat.Png); } } } private void button1_Click(object sender, EventArgs e) { wWordApp = new Word.Application(); wWordApp.Documents.Open(ref filename, ref missing, ref readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing); try { for (int i = 1; i <= wWordApp.ActiveDocument.InlineShapes.Count; i++) { m_i = i; CopyFromClipbordInlineShape(Convert.ToString(i)); } } finally { object save = false; wWordApp.Quit(ref save, ref missing, ref missing); wWordApp = null; } } Method Two Unzip the word file (.docx) - Copy the media(image) folder, store somewhere - Parse the XML file - Store the text in db Any suggestion/help would be greatly appreciated :D Preview of the word file: (backup link: http://i.stack.imgur.com/YF1Ap.png)

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  • Android Activity ClassNotFoundException - tried everything

    - by Matthew Rathbone
    I've just refactored an app into a framework library and an application, but now when I try and start the app in the emulator I get the following error stack trace: 06-02 18:22:35.529: E/AndroidRuntime(586): FATAL EXCEPTION: main 06-02 18:22:35.529: E/AndroidRuntime(586): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.matthewrathbone.eastersays/com.matthewrathbone.eastersays.EasterSimonSaysActivity}: java.lang.ClassNotFoundException: com.matthewrathbone.eastersays.EasterSimonSaysActivity in loader dalvik.system.PathClassLoader[/data/app/com.matthewrathbone.eastersays-1.apk] 06-02 18:22:35.529: E/AndroidRuntime(586): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.os.Handler.dispatchMessage(Handler.java:99) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.os.Looper.loop(Looper.java:123) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.app.ActivityThread.main(ActivityThread.java:4627) 06-02 18:22:35.529: E/AndroidRuntime(586): at java.lang.reflect.Method.invokeNative(Native Method) 06-02 18:22:35.529: E/AndroidRuntime(586): at java.lang.reflect.Method.invoke(Method.java:521) 06-02 18:22:35.529: E/AndroidRuntime(586): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 06-02 18:22:35.529: E/AndroidRuntime(586): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 06-02 18:22:35.529: E/AndroidRuntime(586): at dalvik.system.NativeStart.main(Native Method) 06-02 18:22:35.529: E/AndroidRuntime(586): Caused by: java.lang.ClassNotFoundException: com.matthewrathbone.eastersays.EasterSimonSaysActivity in loader dalvik.system.PathClassLoader[/data/app/com.matthewrathbone.eastersays-1.apk] 06-02 18:22:35.529: E/AndroidRuntime(586): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243) 06-02 18:22:35.529: E/AndroidRuntime(586): at java.lang.ClassLoader.loadClass(ClassLoader.java:573) 06-02 18:22:35.529: E/AndroidRuntime(586): at java.lang.ClassLoader.loadClass(ClassLoader.java:532) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 06-02 18:22:35.529: E/AndroidRuntime(586): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577) 06-02 18:22:35.529: E/AndroidRuntime(586): ... 11 more Usually this means that the manifest file is wrong in some way, but I've double checked everything I can think of. Here is my activity class: package com.matthewrathbone.eastersays; import android.os.Bundle; import com.rathboma.simonsays.Assets.Season; import com.rathboma.simonsays.SeasonPicker; import com.rathboma.simonsays.SimonSaysActivity; public class EasterSimonSaysActivity extends SimonSaysActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); } @Override public SeasonPicker getSeasonPicker() { return new SeasonPicker(){ @Override public Season getSeason() { // TODO Auto-generated method stub return Season.EASTER; } }; } } As you can see, it's listed correctly in the manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.matthewrathbone.eastersays" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="15" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".EasterSimonSaysActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> I have no idea how to fix this, and would appreciate any help. I've scanned many similar questions on SO without seeing this particular behavior. More info: I've checked inside the generated APK and the class has an entry in the classes.dex file I've tried cleaning/building the project in eclipse I've tried using a totally new device image that doesn't have a copy of the APK on it already I've changed the library project into a regular java, then changed back into an android project, no difference

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  • Domain Validation in a CQRS architecture

    - by Jupaol
    Basically I want to know if there is a better way to validate my domain entities. This is how I am planning to do it but I would like your opinion The first approach I considered was: class Customer : EntityBase<Customer> { public void ChangeEmail(string email) { if(string.IsNullOrWhitespace(email)) throw new DomainException(“...”); if(!email.IsEmail()) throw new DomainException(); if(email.Contains(“@mailinator.com”)) throw new DomainException(); } } I actually do not like this validation because even when I am encapsulating the validation logic in the correct entity, this is violating the Open/Close principle (Open for extension but Close for modification) and I have found that violating this principle, code maintenance becomes a real pain when the application grows up in complexity. Why? Because domain rules change more often than we would like to admit, and if the rules are hidden and embedded in an entity like this, they are hard to test, hard to read, hard to maintain but the real reason why I do not like this approach is: if the validation rules change, I have to come and edit my domain entity. This has been a really simple example but in RL the validation could be more complex So following the philosophy of Udi Dahan, making roles explicit, and the recommendation from Eric Evans in the blue book, the next try was to implement the specification pattern, something like this class EmailDomainIsAllowedSpecification : IDomainSpecification<Customer> { private INotAllowedEmailDomainsResolver invalidEmailDomainsResolver; public bool IsSatisfiedBy(Customer customer) { return !this.invalidEmailDomainsResolver.GetInvalidEmailDomains().Contains(customer.Email); } } But then I realize that in order to follow this approach I had to mutate my entities first in order to pass the value being valdiated, in this case the email, but mutating them would cause my domain events being fired which I wouldn’t like to happen until the new email is valid So after considering these approaches, I came out with this one, since I am going to implement a CQRS architecture: class EmailDomainIsAllowedValidator : IDomainInvariantValidator<Customer, ChangeEmailCommand> { public void IsValid(Customer entity, ChangeEmailCommand command) { if(!command.Email.HasValidDomain()) throw new DomainException(“...”); } } Well that’s the main idea, the entity is passed to the validator in case we need some value from the entity to perform the validation, the command contains the data coming from the user and since the validators are considered injectable objects they could have external dependencies injected if the validation requires it. Now the dilemma, I am happy with a design like this because my validation is encapsulated in individual objects which brings many advantages: easy unit test, easy to maintain, domain invariants are explicitly expressed using the Ubiquitous Language, easy to extend, validation logic is centralized and validators can be used together to enforce complex domain rules. And even when I know I am placing the validation of my entities outside of them (You could argue a code smell - Anemic Domain) but I think the trade-off is acceptable But there is one thing that I have not figured out how to implement it in a clean way. How should I use this components... Since they will be injected, they won’t fit naturally inside my domain entities, so basically I see two options: Pass the validators to each method of my entity Validate my objects externally (from the command handler) I am not happy with the option 1 so I would explain how I would do it with the option 2 class ChangeEmailCommandHandler : ICommandHandler<ChangeEmailCommand> { public void Execute(ChangeEmailCommand command) { private IEnumerable<IDomainInvariantValidator> validators; // here I would get the validators required for this command injected, and in here I would validate them, something like this using (var t = this.unitOfWork.BeginTransaction()) { var customer = this.unitOfWork.Get<Customer>(command.CustomerId); this.validators.ForEach(x =. x.IsValid(customer, command)); // here I know the command is valid // the call to ChangeEmail will fire domain events as needed customer.ChangeEmail(command.Email); t.Commit(); } } } Well this is it. Can you give me your thoughts about this or share your experiences with Domain entities validation EDIT I think it is not clear from my question, but the real problem is: Hiding the domain rules has serious implications in the future maintainability of the application, and also domain rules change often during the life-cycle of the app. Hence implementing them with this in mind would let us extend them easily. Now imagine in the future a rules engine is implemented, if the rules are encapsulated outside of the domain entities, this change would be easier to implement

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  • Delphi 2010 differs in Canvas transparency compared to Delphi 7?

    - by Tom1952
    I'm porting some very old code from Delph7 to Delphi2010 with a few changes as possible to the existing code base for the usual reasons. First: the good news for anyone who hasn't jumped yet: it's not as daunting as it may look! I'm actually pleased (& surprised) at how easy 1,000,000+ lines of code have moved across. And what a relief to be back on the leading edge! Delphi 2010 has so many great enhancements. However, I'm having a cosmetic problem with some TStringGrids and TDbGrids descendants. In the last century (literally!) someone wrote the two methods below. The first method is used to justify text. When run in Delphi 2010, the new text and the unjustified text to both appear in the cells written to. Of course it's a mess visually, almost illegible. Sometimes, as a result of the second method is use, the grid cells are actually semi-transparent, with text from the window below showing through. (Again, not pretty!) It appears to me that Delphi 2010's TDbGrid and TStringGrid have some differences in the way they handle transparency? I haven't much experience in this area of Delphi (in fact, I have no idea what the 2nd method is actually doing!) and was hoping someone could give me some pointers on what's going on and how to fix it. TIA! Method 1 procedure TForm1.gridDrawCell(Sender: TObject; Col, Row: Integer; Rect: TRect; State: TGridDrawState); {Used to align text in cells.} var x: integer; begin if (Row > 0) AND (Col > 0) then begin SetTextAlign(grdTotals.Canvas.Handle, TA_RIGHT); x := Rect.Right - 2; end else begin SetTextAlign(grdTotals.Canvas.Handle, TA_CENTER); x := (Rect.Left + Rect.Right) div 2; end; grdTotals.Canvas.TextRect(Rect, x, Rect.Top+2, grdTotals.Cells[Col,Row]); end; Method 2 procedure WriteText(ACanvas: TCanvas; ARect: TRect; DX, DY: Integer; const Text: string; TitleBreak: TTitleBreak; Alignment: TAlignment); const AlignFlags: array [TAlignment] of Integer = (DT_LEFT or { DT_WORDBREAK or } DT_EXPANDTABS or DT_NOPREFIX, DT_RIGHT or { DT_WORDBREAK or } DT_EXPANDTABS or DT_NOPREFIX, DT_CENTER or { DT_WORDBREAK or } DT_EXPANDTABS or DT_NOPREFIX); var ABitmap: TBitmap; AdjustBy: Integer; B, R: TRect; WordBreak: Integer; begin WordBreak := 0; if (TitleBreak = tbAlways) or ((TitleBreak = tbDetect) and (Pos(Chr(13) + Chr(10), Text) = 0)) then WordBreak := DT_WORDBREAK; ABitmap := TBitmap.Create; try ABitmap.Canvas.Lock; try AdjustBy := 1; if (Alignment = taRightJustify) then Inc(AdjustBy); with ABitmap, ARect do begin Width := Max(Width, Right - Left); Height := Max(Height, Bottom - Top); R := Rect(DX, DY, Right - Left - AdjustBy, Bottom - Top - 1); { @@@ } B := Rect(0, 0, Right - Left, Bottom - Top); end; with ABitmap.Canvas do begin Font := ACanvas.Font; Brush := ACanvas.Brush; Brush.Style := bsSolid; FillRect(B); SetBkMode(Handle, TRANSPARENT); DrawText(Handle, PChar(Text), Length(Text), R, AlignFlags[Alignment] or WordBreak); end; ACanvas.CopyRect(ARect, ABitmap.Canvas, B); finally ABitmap.Canvas.Unlock; end; finally ABitmap.Free; end; end;

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  • CustomListAdapter Problem in Android? Getting ClassCast Exception? How???

    - by Praveen Chandrasekaran
    i want to improve the list view's performance. this is the code for my getView method in my Adapter? public View getView(int arg0, View text_view_name, ViewGroup parent) { try { if (text_view_name == null) { text_view_name = mInflater.inflate( R.layout.bs_content_list_item1, null); text_view_name.setTag(R.id.text1_detail1, text_view_name .findViewById(R.id.text1_detail1)); text_view_name.setTag(R.id.text3_detail1, text_view_name .findViewById(R.id.text3_detail1)); text_view_name.setTag(R.id.eve_img_detail1, text_view_name .findViewById(R.id.eve_img_detail1)); } text1 = (TextView) text_view_name.getTag(R.id.text1_detail1); // text2 = (TextView) text_view_name.getTag(R.id.text2); text3 = (TextView) text_view_name.getTag(R.id.text3_detail1); img = (ImageView) text_view_name.getTag(R.id.eve_img_detail1); text1.setText(VAL1[arg0]); text3.setText(VAL3[arg0]); if (!mBusy) { img_value = new URL(VAL4[arg0]); mIcon11 = BitmapFactory.decodeStream(img_value.openConnection() .getInputStream()); img.setImageBitmap(mIcon11); text_view_name.setTag(R.id.eve_img_detail1, null); } else { img.setImageResource(R.drawable.icon); text_view_name.setTag(R.id.eve_img_detail1, text_view_name .findViewById(R.id.eve_img_detail1)); } } catch (Exception e) { name = "Exception in MultiLine_bar_details1 getView"; Log.v(TAG, name + e); } return text_view_name; } this is the code for scrollstatechanged method: public void onScrollStateChanged(AbsListView view, int scrollState) { switch (scrollState) { case OnScrollListener.SCROLL_STATE_IDLE: try { MultiLine_bar_details1.mBusy = false; int first = view.getFirstVisiblePosition(); int count = view.getCount(); for (int i = 0; i < count; i++) { ImageView t = (ImageView) view.getChildAt(i);// here getting the ClassCastException if (t.getTag(R.id.eve_img_detail1) != null) { MultiLine_bar_details1.img_value = new URL( MultiLine_bar_details1.VAL4[first + i]); MultiLine_bar_details1.mIcon11 = BitmapFactory .decodeStream(MultiLine_bar_details1.img_value .openConnection().getInputStream()); MultiLine_bar_details1.img.setImageBitmap(MultiLine_bar_details1.mIcon11); t.setTag(R.id.eve_img_detail1, null); } } } catch (Exception e) { Log.v(TAG, "Idle" + e); } // mStatus.setText("Idle"); break; case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL: MultiLine_bar_details1.mBusy = true; break; case OnScrollListener.SCROLL_STATE_FLING: MultiLine_bar_details1.mBusy = true; break; } } getting the Exception in Idle state: 05-03 16:47:15.201: VERBOSE/BS_Bars(258): Idlejava.lang.ClassCastException: android.widget.LinearLayout this is very complicated for me to get the output properly. actually i have the listview with custom adapter. that icons makes the listview scroll very slow.i am getting the images for icons from the image urls. upto this(above code) i can improve the scroll performance of my list view. but the image icons are not proper in the corresponding order. its dynamically changing when i scroll the listview.. i refered the commonsware busy coder guide and this blog. My very Big question is "How can we access the single view in scrollstatechanged parameter AbsListView? " what is the problem in it? how to do it better? Any Idea?

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  • WCF REST Question, Binding, Configuration

    - by Ethan McGee
    I am working on a WCF rest interface using json. I have wrapped the service in a windows service to host the service but I am now having trouble getting the service to be callable. I am not sure exactly what is wrong. The basic idea is that I want to host the service on a remote server so I want the service mapped to port localhost:7600 so that it can be invoked by posting data to [server_ip]:7600. The problem is most likely in the configuration file, since I am new to WCF and Rest I wasn't really sure what to type for the configuration so sorry if it's a total mess. I removed several chunks of code and comments to make it a little easier to read. These functions should have no bearing on the service since they call only C# functions. WCF Service Code using System; using System.Collections.Generic; using System.Linq; using System.ServiceModel; using System.ServiceModel.Activation; using System.ServiceModel.Web; using System.Text; namespace PCMiler_Connect { public class ZIP_List_Container { public string[] ZIP_List { get; set; } public string Optimized { get; set; } public string Calc_Type { get; set; } public string Cross_International_Borders { get; set; } public string Use_Kilometers { get; set; } public string Hazard_Level { get; set; } public string OK_To_Change_Destination { get; set; } } [ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class PCMiler_Webservice { [WebInvoke(Method = "POST", UriTemplate = "", ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json), OperationContract] public List<string> Calculate_Distance(ZIP_List_Container container) { return new List<string>(){ distance.ToString(), time.ToString() }; } } } XML Config File <?xml version="1.0" encoding="utf-8"?> <configuration> <system.serviceModel> <services> <service name="PCMiler_Connect.PCMiler_Webservice"> <endpoint address="" behaviorConfiguration="jsonBehavior" binding="webHttpBinding" bindingConfiguration="" contract="PCMiler_Connect.PCMiler_Webservice" /> <host> <baseAddresses> <add baseAddress="http://localhost:7600/" /> </baseAddresses> </host> </service> </services> <behaviors> <endpointBehaviors> <behavior name="jsonBehavior"> <enableWebScript/> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> </configuration> Service Wrapper using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Diagnostics; using System.Linq; using System.ServiceProcess; using System.ServiceModel; using System.Text; using System.Threading; namespace PCMiler_WIN_Service { public partial class Service1 : ServiceBase { ServiceHost host; public Service1() { InitializeComponent(); } protected override void OnStart(string[] args) { host = new ServiceHost(typeof(PCMiler_Connect.PCMiler_Webservice)); Thread thread = new Thread(new ThreadStart(host.Open)); } protected override void OnStop() { if (host != null) { host.Close(); host = null; } } } }

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  • How do I evaluate my skillset against the current market to see what needs improvement and where my

    - by baijajusav
    First of all, this question may be out of bounds for this site. If so, remove it. I say this because this site seems to be a place for more concrete questions that are not so relative in nature. And before I begin, for those of you whom just prefer a question and not this sort of dialog, here is my question: How can I assess my current skills as a programmer and decide where and what areas to improve upon? That said, here's what I'm asking/talking about, in essence. The market is always in constant flux. As programmers we're always having to learn new things, update our skills, push ourselves into that next project. There's not a very good litmus test that I know of for us to get an idea of where we stand as programmers. I came across this blog post by Jeff Atwood talking about why can't programmers code. Instinctively (and as the post goes on to state) I rushed through the program in about 4 minutes (most of that time was b/c I was hand writing it out. Still, this doesn't really answer the question of where do my skills need to be to succeed in today's world. I real blogs, listen to podcasts, try to keep up on the latest things coming out. It has only been in the past couple of months that I made a decision to pick a focus area for my learning as I can't learn everything and trying to do so is to spread myself too thin. I chose ASP.NET MVC & C#. I plan to stick with Microsoft technologies, not out of some sense of loyalty or stubbornness, but rather because they seem to stream together and have a unifying connection between them. With Windows Phone 7 coming out, it seems that now is the obvious time to pick up WPF and Silverlight as well. Still, if you asked me to code something apart from intellisense and the internet, I probably couldn't get the syntax right. I don't have libraries memorized or know precisely where the classes I use exist within the .Net framework, namely because I haven't had to pull that knowledge out of the air. In a way, I suppose Visual Studio has insulated me, which isn't a good thing, but, at the same time, I've still been able to be productive. I'm working on my own side project to try and help my learning. In doing so, I'm trying to make use of best practices and 3rd party frameworks where I can. I'm using automapper and EF 1.0. I know everyone in the .net community seems to cry foul at the sound of EF 1.0, but I can't say why because I've never used it. There's no lazy loading and that has proven rather annoying; however, aside from that, I haven't had that much of an issue. Granted this is probably because I'm not writing tests as I go (which I'm not doing because I don't know how to test EF in tests and don't really have a clue how to write tests for ASP.NET MVC 1.0). I'm also using a custom membership provider; granted, it's a barebone implementation, but I'm using it still. My thinking in all of this is, while I am neglecting a great many important technologies that are in the mainstream, I'll have a working project in the end. I can come back and add those things after I finish. Doing it all now and at once seems like too much. I know how I work and I don't think I'd ever get it done that way. I've elected to make this a community wiki as I think this question might fight better there. If a moderator disagrees with that choice or the decision to post this here, the just delete the question. I'm not trying to make undue work for anyone. I'm just a programmer trying to assess my where his skills are now and where I should be improving.

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  • Wordpress > Custom wp-archives list by year and category with post count in sidebar

    - by David
    So I have been trying to add a custom sidebar archives section to this Wordpress Theme. I am trying to get two separate yearly archive sections, one for category A and one for category B. I need to get a post count and display it as well, to the left of "articles". This is the format I have been trying to get in the sidebar: Category 1 2010 - 5 articles 2009 - 4 articles 2008 - 6 articles 2007 - 5 articles Category 2 2010 - 8 articles 2009 - 3 articles 2008 - 7 articles 2007 - 5 articles This code is pulling the yearly archive, but the links to the yearly archives do not filter by category. However, if Category 1 does not have posts in 2008, 2008 would not show. So I feel like I am really close, but there is something wrong here in the code. I have also been unsuccessful in pulling the post count for the year/category either. Here is what I get: Category 1 2010 - articles (these links all take you to the general yearly archive page, not category specific) 2009 - articles 2007 - articles Category 2 2010 - articles 2009 - articles 2008 - articles 2007 - articles Here is are the functions I am using in my functions.php file, any idea what I am doing wrong? <?php function company_below_sidebar() { global $cat; ?> <div id="press"> <h2>Press</h2> <ul><?php $cat = '1'; wp_get_archives('type=yearly') ?></ul> </div> <div id="news"> <h2>News</h2> <ul><?php $cat = '4'; wp_get_archives('type=yearly') ?></ul> </div> <?php } add_action('thematic_betweenmainasides', 'company_below_sidebar'); function customarchives_join( $x ) { global $wpdb; return $x . " INNER JOIN $wpdb->term_relationships ON ($wpdb->posts.ID = $wpdb- >term_relationships.object_id) INNER JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)"; } function customarchives_where( $x ) { global $wpdb; global $cat; return $x . " AND $wpdb->term_taxonomy.taxonomy = 'category' AND $wpdb->term_taxonomy.term_id IN ($cat)"; } add_filter( 'getarchives_where', 'customarchives_where' ); add_filter( 'getarchives_join', 'customarchives_join' ); function company_monthly_archive_flexible($input) { // Get URL from $input preg_match('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_\+.~#?&;//=]+)', $input, $matches); $url = $matches[0]; // Get content from $input (without the tags) $content = trim(strip_tags($input)); // Seperate each date element and put it in an array $dates = explode(" ", $content); // Get year $year = $dates[0]; // Customize output format $format = "<li><a href='$url'><b>$year -</b> articles</a></li>\n"; echo $format; } add_filter('get_archives_link','company_monthly_archive_flexible'); ?>

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  • HttpParsing for hypertext

    - by Nani
    I am in process of getting all hierarchical links from a given link and validating them; This is the code I wrote. But I am not feeling it as efficient. Reasons are: 1.For the non unique links which open same page, code is getting sub-links again and again 2.Is the code getting all links? 3.Is it making valid URLs from the sub-links it derived? 4.May be some other reasons about which I have no idea. Please suggest me how to make this piece of code efficient . Thank you. class Program { public static ArrayList sublink = new ArrayList(); public static ArrayList subtitle = new ArrayList(); public static int ini = 0, len_o, len_n, counter = 0; static void Main(string[] args) { // Address of URL string URL = "http://www.techonthenet.com/"; sublink.Add(URL); l: len_o = sublink.Count; len_o); Console.WriteLine("-------------Level:" + counter++); for (int i = ini; i < len_o; i++) test(sublink[i].ToString()); len_n = sublink.Count; if (len_o < len_n) { ini = len_o; goto l; } Console.ReadKey(); } //method to get the sub-links public static void test(string URL) { try { // Get HTML data WebClient client = new WebClient(); Stream data = client.OpenRead(URL); StreamReader reader = new StreamReader(data); string str = "", htmldata = "", temp; int n1, n2; str = reader.ReadLine(); while (str != null) { htmldata += str; str = reader.ReadLine(); } data.Close(); for (int i = 0; i < htmldata.Length - 5; i++) { if (htmldata.Substring(i, 5) == "href=") { n1 = htmldata.Substring(i + 6, htmldata.Length - (i + 6)).IndexOf("\""); temp = htmldata.Substring(i + 6, n1); if (temp.Length > 4 && temp.Substring(0, 4) != "http") { if(temp.Substring(0,1)!="/") temp=URL.Substring(0,URL.IndexOf(".com/")+5)+temp; else temp = URL.Substring(0, URL.IndexOf(".com/") + 5) + temp.Remove(0,1); } if (temp.Length < 4) temp = URL.Substring(0, URL.IndexOf(".com/") + 5) + temp; sublink.Add(temp); n2 = htmldata.Substring(i + n1 + 1, htmldata.Length - (i + n1 + 1)).IndexOf("<"); subtitle.Add(htmldata.Substring(i + 6 + n1 + 2, n2 - 7)); i += temp.Length + htmldata.Substring(i + 6 + n1 + 2, n2 - 7).Length; } } for (int i = len_n; i < sublink.Count; i++) Console.WriteLine(i + "--> " + sublink[i]); } catch (WebException exp) { Console.WriteLine("URL Could not be Resolved" + URL); Console.WriteLine(exp.Message, "Exception"); } } }

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  • Passing unknown amounts of variables using through a string string and eval and multiple functions a

    - by user300797
    I'm not sure how best to describe this problem... In short, I want to use object literal to allow me to pass a random amount of variables in any order to a function. Whilst this is not big deal in theory, in my code, this object literal is passed to a second function call on_change. on_change works comparing an element inner HTML to a string. if it is the same, it sets a time out of to call the function again (this is sort of/almost recursive, but the function dose actually get to end before it is called again). if the elements inner HTML is different from the string, then the third parameter is executed. this will either be a function or a string. either way it will execute. I have tested this function plenty and used it for a while now. how ever, it cannot seem to get the object literal to flow through the function calls... var params = { xpos:'false'}; on_change('window_3_cont_buffer','',' if(Window_manager.windows[3].window_cont_buffer.getElementsByTagName(\'content\')[0].getElementsByTagName(\'p\')[0].innerHTML == \'ERROR\'){ alert(Window_manager.windows[3].window_cont_buffer.getElementsByTagName(\'content\')[0].getElementsByTagName(\'p\')[1].innerHTML); return false; } else { Window_manager.windows[3].load_xml(\'location/view.php?location_ID=3\', \'\', ' + params + ' ); } '); I call this as part of the form submission. after this line, I then call a function to load some content via ajax, which works fine and will trigger the code from the on_change function. I have tested load_xml function it is able to call alert(param.xpos) and get the correct response. I can even added in a check for being undefined so that rest of the times I cam load_xml I don't get swamped with alerts. The load_xml function first set up the on_change function, then calls the function to load the content to a hidden div. Once the AJAX request has updated that DIV, the on_change function should now call the parse_xml function. This pulls out the information from the xml file. How ever... The idea of this object literal param is that it can tell this parse_xml function to ignore certain things. on_change("window_" + this.id + "_cont_buffer", "", "Window_manager.windows[" + this.id + "].parse_xml('" + param + "')"); this is part of load_xml. it works perfectly fine, even with the param bit in there. except, parse_xml dose not seem to be able to use that parameter. I have been able to get it to a point where parse_xml can alert(param) and give [object object] which I would of thought meant that the object litteral had been passed through, but when I try and call alert(param.xpos) I get undefined. I know this is a pig of a problem, and I could get around it by just having the function take a zillion boolean parameters, but its just not practical or elegant. I'm sure you will need to ask me plenty more questions before I can solve this. I will post more complete code, I just cut it down to what is actually going on. Thanks

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