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• How to restart Linux from inside a C++ program?

  - by Dave K

  I have a Qt 4 GUI where I need to have a option in a drop-down menu that allows the user to choose to restart the computer. I realize this might seem redunant with the ability to restart the computer in other ways, but the choice needs to stay there. I've tried using system() to call the following: a suid-root shell script a non-suid shell script a suid-root binary program and all of them just cause reboot: must be superuser to be printed. Using system() to call reboot directly does the same thing. I'm not especially attached to using system() to do this, but it seemed like the most direct choice. How can I reboot the system from the GUI?

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• HTML5 Video Javascript

  - by user373721

  Hi, I am not experienced in Javascript, I have the following script to play video files on Andriod phone, and it works fine. <script type="text/javascript"> function PlayMyVideo(arg) { var myVideo = document.getElementById([arg]); myVideo.play(); } </script> <video id="what" src="what.mp4" poster="" /> <input type="button" onclick="PlayMyVideo('what')" value="Play" /> I am trying to write the tag on the fly: <script type="text/javascript"> function PlayVideo() { new_video = document.createElement('video'); new_video.setAttribute('scr', 'what.mp4'); new_video.play(); } </script> <input type="button" onclick="PlayVideo()" value="Play2" /> Nothing happen, would appreciate your suggestions. Thanks in advance

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• Generic Dictionary - Getting Conversion Error

  - by pm_2

  The following code is giving me an error: // GetDirectoryList() returns Dictionary<string, DirectoryInfo> Dictionary<string, DirectoryInfo> myDirectoryList = GetDirectoryList(); // The following line gives a compile error foreach (Dictionary<string, DirectoryInfo> eachItem in myDirectoryList) The error it gives is as follows: Cannot convert type 'System.Collections.Generic.KeyValuePair<string,System.IO.DirectoryInfo>' to 'System.Collections.Generic.Dictionary<string,System.IO.DirectoryInfo>’ My question is: why is it trying to perform this conversion? Can I not use a foreach loop on this type of object?

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• <script> Tag cannot be self closed?

  - by Joe Hopfgartner

  I had this code in my Website <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.4.min.js"/> <script type='text/javascript' src='/lib/player/swfobject.js'></script> swfobject was not working (not loaded). After altering the code to: <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.4.min.js"></script> <script type='text/javascript' src='/lib/player/swfobject.js'></script> It worked fine. The document was parsed as HTML5. I think its funny. Okay, granted a tag that is closed and a self closing tag are not the same. So i would understand if jquery couldnt load. Altough i find it rediciulous. But what i do not understand is that jquery loads but the following, correctly written tag, doesnt?

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• jquery convert serialized form inputs to xml string

  - by user590586

  Hi , I'm trying to get all my form inputs and then create with them an xml string containing there values in order to send them via ajax. i want this : <form id="formtest"> <input type="text" name="test1" id="test1"/> <input type="text" name="test2" id="test2"/> <input type="text" name="test3" id="test3"/> <input type="text" name="test4" id="test4"/> <input type="text" name="test5" id="test5"/> </form> to become: <formtest> <test1></test1> <test2></test2> <test3></test3> <test4></test4> <test5></test5> </formtest> How can this be done? Thank's In Advance.

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• Casting error in my form

  - by Siva

  I have a ComboBox in a DataGridView. However I get an error when I run it: Unable to cast object of type 'System.Windows.Forms.DataGridView' to type 'System.Windows.Forms.ComboBox'. What can I do to resolve this error? ComboBox comboBox; private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (e.Control is ComboBox) { comboBox = e.Control as ComboBox; if (dataGridView1.CurrentCell.ColumnIndex >= 0) { System.Diagnostics.Debug.WriteLine("Edit Control Showing"); comboBox.SelectedIndexChanged -= new EventHandler(comboBoxItems_SelectedIndexChanged); comboBox.SelectedIndexChanged += new EventHandler(comboBoxItems_SelectedIndexChanged); } } } void comboBoxItems_SelectedIndexChanged(object sender, EventArgs e) { try { int comboBoxSelectedIndex = ((ComboBox)sender).SelectedIndex; string comboboxSelectedValue = ((ComboBox)sender).SelectedText; int gridViewSelectedRow = dataGridView1.CurrentRow.Index; if (comboBoxSelectedIndex >= 0 && gridViewSelectedRow >= 0) { System.Diagnostics.Debug.WriteLine("ComboBox Index - " + comboBoxSelectedIndex); System.Diagnostics.Debug.WriteLine("GridView Index - " + gridViewSelectedRow); if (comboBox != null) { comboBox.SelectedIndexChanged -= new EventHandler(comboBoxItems_SelectedIndexChanged); } } } catch(Exception E) { } }

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• asset_packing tiny_mce files

  - by haries

  I use inplacericheditor plugin and tiny_mce Before asset_packager usage, this is how I include the files and they work well <script src="/javascripts/patch_inplaceeditor_1-8-2.js" type="text/javascript"> </script> <script src="/javascripts/patch_inplaceeditor_editonblank_1-8-2.js" type="text/javascript" </script> <script src="/javascripts/tiny_mce/tiny_mce.js" type="text/javascript"></script> <script src="/javascripts/tiny_mce_init.js" type="text/javascript"></script> <script src="/javascripts/inplacericheditor.js" type="text/javascript"></script> My asset_packager.yml section looks like this for the above files: tinyeditor: patch_inplaceeditor_1-8-2 patch_inplaceeditor_editonblank_1-8-2 tiny_mce/tiny_mce tiny_mce_init tiny_mce/langs/en tiny_mce/themes/advanced/editor_template tiny_mce/themes/advanced/langs/en tiny_mce/plugins/save/editor_plugin tiny_mce/plugins/autoresize/editor_plugin tiny_mce/plugins/paste/editor_plugin tiny_mce/plugins/preview/editor_plugin tiny_mce/plugins/table/editor_plugin tiny_mce/plugins/contextmenu/editor_plugin tiny_mce/plugins/emotions/editor_plugin inplacericheditor When I include the asset_packaged file and load the page (in production) I get the following errors: "Ajax.InPlaceEditor is undefined" "Ajax.InPlaceRichEditor is not a constructor" Can anyone shed some light on where I am going wrong or share a better way to asset_package tinymce? Thanks!

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• Why does FrameworkElement's FindResource() Method Accept an Object and not a String?

  - by ChrisNel52

  I understand that calling FindResource() on a FrameworkElement (e.g. a Window) can be used to find a resource in the FrameworkElement's ResourceDictionary. For example, I've used it many times to access a Style through code to add a new Setter to the Style dynamically. I always pass the x:Key value of the Style as a string into the FindResource() method. Like... Style style = w.FindResource("GridDescriptionColumn") as Style; My question is, I noticed that FindResource() accepts an argument of type object and not an argument of type string. I can't for the life of my think of a reason I would call FindResource() with an argument that is not a string. It makes me think that I may unaware of other ways to use FindResource(). Does anyone know why FindResource() accepts a parameter type of object and not string? If so, what would be an example of calling FindResource() with a parameter type other than a string? Thanks.

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• parse unformatted string into dictionary with python

  - by user553131

  I have following string. DATE: 12242010Key Type: Nod32 Anti-Vir (30d trial) Key: a5B2s-sH12B-hgtY3-io87N-srg98-KLMNO I need to create dictionary so it would be like { "DATE": "12242010", "Key Type": "Nod32 Anti-Vir (30d trial)", "Key": "a5B2s-sH12B-hgtY3-io87N-srg98-KLMNO" } The problem is that string is unformatted DATE: 12242010Key Type: Nod32 Anti-Vir (30d trial) there is no space after Date before Key Type also it would be nice to have some validation for Key, eg if there are 5 chars in each box of key and number of boxes I am a beginner in python and moreover in regular expressions. Thanks a lot.

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• Will Sytem.currentTimeMillis always return a value >= previous calls?

  - by 1984isnotamanual

  http://java.sun.com/j2se/1.4.2/docs/api/java/lang/System.html#currentTimeMillis() says: Returns the current time in milliseconds. Note that while the unit of time of the return value is a millisecond, the granularity of the value depends on the underlying operating system and may be larger. For example, many operating systems measure time in units of tens of milliseconds. It is not clear to me if I am guaranteed that this code will always print ever increasing (or the same) numbers. while (1) { System.out.println(System.currentTimeMillis() ); }

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• C++ Questions about vectors

  - by xbonez

  Hey guys, I have a CS exam tomorrow. Just want to get a few questions cleared up. Thanks a lot, and I really appreciate the help. Que 1. What are parallel vectors? Vectors of the same length that contain data that is meant to be processed together Vectors that are all of the same data type Vectors that are of the same length Any vector of data type parallel Que 2. Arrays are faster and more efficient than vectors. True False Que 3. Arrays can be a return type of a function call. True False Que 4. Vectors can be a return type of a function call. True False

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• jQuery .find() doesn't return data in IE but does in Firefox and Chrome

  - by Steve Hiner

  I helped a friend out by doing a little web work for him. Part of what he needed was an easy way to change a couple pieces of text on his site. Rather than having him edit the HTML I decided to provide an XML file with the messages in it and I used jQuery to pull them out of the file and insert them into the page. It works great... In Firefox and Chrome, not so great in IE7. I was hoping one of you could tell me why. I did a fair but of googling but couldn't find what I'm looking for. Here's the XML: <?xml version="1.0" encoding="utf-8" ?> <messages> <message type="HeaderMessage"> This message is put up in the header area. </message> <message type="FooterMessage"> This message is put in the lower left cell. </message> </messages> And here's my jQuery call: <script type="text/javascript"> $(document).ready(function() { $.get('messages.xml', function(d) { //I have confirmed that it gets to here in IE //and it has the xml loaded. //alert(d); gives me a message box with the xml text in it //alert($(d).find('message')); gives me "[object Object]" //alert($(d).find('message')[0]); gives me "undefined" //alert($(d).find('message').Length); gives me "undefined" $(d).find('message').each(function() { //But it never gets to here in IE var $msg = $(this); var type = $msg.attr("type"); var message = $msg.text(); switch (type) { case "HeaderMessage": $("#HeaderMessageDiv").html(message); break; case "FooterMessage": $("#footermessagecell").html(message); break; default: } }); }); }); </script> Is there something I need to do differently in IE? Based on the message box with [object Object] I'm assumed that .find was working in IE but since I can't index into the array with [0] or check it's Length I'm guessing that means .find isn't returning any results. Any reason why that would work perfectly in Firefox and Chrome but fail in IE? I'm a total newbie with jQuery so I hope I haven't just done something stupid. That code above was scraped out of a forum and modified to suit my needs. Since jQuery is cross-platform I figured I wouldn't have to deal with this mess. Edit: I've found that if I load the page in Visual Studio 2008 and run it then it will work in IE. So it turns out it always works when run through the development web server. Now I'm thinking IE just doesn't like doing .find in XML loaded off of my local drive so maybe when this is on an actual web server it will work OK. I have confirmed that it works fine when browsed from a web server. Must be a peculiarity with IE. I'm guessing it's because the web server sets the mime type for the xml data file transfer and without that IE doesn't parse the xml correctly.

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• About Sdram software :Self-refresh mode

  - by student_pdas

  For power management we have to put system in deep sleep(system sleep) mode and for this we have to put SDRAM in self refresh mode. Can anyone tell the steps to set SDARM in self refresh mode. I tried SDRAM configuration register's ,I found that the SDRAM do goes to self-refresh mode[we probed the SD clk out] however system crashes in some scenarios while coming out of sleep.

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• How can I decrease time opening myisam table in an "union all" of the same table??

  - by parm.95

  I have a myisam table with 2.5M rows, I use an union all to get my results as following: (SELECT t.id FROM t WHERE type=1 LIMIT 10) UNION ALL (SELECT t.id FROM t WHERE type=2 LIMIT 10) ... UNION ALL (SELECT t.id FROM t WHERE type=25 LIMIT 10) the time to opening the table t is about 6ms. With a single request: SELECT t.id FROM t WHERE type=1 LIMIT 10 the time is about 1ms. What I don't understand is why mysql spend more time to the same table in union all. It should recognize that is the same table and so just opening at the first union. Does anybody can help me to decrease the time for opening table in a "union all"? Thanks in advance!

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• question on revrse array

  - by davit-datuashvili

  we know algorithm how reverse array of n integers for (int i=0;i<n/2;i++){ swap(a[i],a[n-1-i]): } is this method better according the speed of algorithm or not because swap using xor is more fast then in other method here is code public class swap{ public static void main(String[]args){ int a[]=new int[]{2,4,5,7,8,11,13,12,14,24}; System.out.println(" array at the begining:"); for (int i=0;i<a.length;i++){ System.out.println(a[i]); } for (int j=0;j<a.length/2;j++){ a[j]^=a[a.length-1-j]; a[a.length-1-j]^=a[j]; a[j]^=a[a.length-1-j]; } System.out.println("reversed array:"); for (int j=0;j<a.length;j++){ System.out.println(a[j]); } } } //result array at the begining: 2 4 5 7 8 11 13 12 14 24 reversed array: 24 14 12 13 11 8 7 5 4 2

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• Serialization of a TChan String

  - by J Fritsch

  I have declared the following type KEY = (IPv4, Integer) type TPSQ = TVar (PSQ.PSQ KEY POSIXTime) type TMap = TVar (Map.Map KEY [String]) data Qcfg = Qcfg { qthresh :: Int, tdelay :: Rational, cwpsq :: TPSQ, cwmap :: TMap, cw chan :: TChan String } deriving (Show) and would like this to be serializable in a sense that Qcfg can either be written to disk or be sent over the network. When I compile this I get the error No instances for (Show TMap, Show TPSQ, Show (TChan String)) arising from the 'deriving' clause of a data type declaration Possible fix: add instance declarations for (Show TMap, Show TPSQ, Show (TChan String)) or use a standalone 'deriving instance' declaration, so you can specify the instance context yourself When deriving the instance for (Show Qcfg) I am now not quite sure whether there is a chance at all to serialize my TChan although all individual nodes in it are members of the show class. For TMap and TPSQ I wonder whether there are ways to show the values in the TVar directly (because it does not get changed, so there should no need to lock it) without having to declare an instance that does a readTVar ?

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• If statements Evaluations

  - by user2464795

  Using the code below I get this result even though I put in a number that is greater than 18. run: How old are you? 21 You have not reached the age of Majority yet! BUILD SUCCESSFUL (total time: 3 seconds) I am new to java and trying to self learn can anybody help? import java.util.Scanner; public class Chapter8 { /** * @param args the command line arguments */ public static void main(String[] args) { Scanner reader = new Scanner (System.in); // TODO code application logic here //Excercise 15 System.out.print("How old are you? "); int x = Integer.parseInt(reader.nextLine()); if (x > 18){ System.out.println("You have not reached the age of Majority yet!"); }else { System.out.println("You have reached the age of Majority!"); }

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• Are Interfaces "Object"?

  - by PrashantGupta

  package inheritance; class A{ public String display(){ return "This is A!"; } } interface Workable{ public String work(); } class B extends A implements Workable{ public String work(){ return "B is working!"; } } public class TestInterfaceObject{ public static void main(String... args){ B obj=new B(); Workable w=obj; //System.out.println(w.work()); //invoking work method on Workable type reference System.out.println(w.display()); //invoking display method on Workable type reference //System.out.println(w.hashCode()); // invoking Object's hashCode method on Workable type reference } } As we know that methods which can be invoked depend upon the type of the reference variable on which we are going to invoke. Here, in the code, work() method was invoked on "w" reference (which is Workable type) so method invoking will compile successfully. Then, display() method is invoked on "w" which yields a compilation error which says display method was not found, quite obvious as Workable doesn't know about it. Then we try to invoke the Object class's method i.e. hashCode() which yields a successful compilation and execution. How is it possible? Any logical explanation?

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• AJAX Closures and targeting 'this'

  - by Nick Lowman

  In the code example below the success callback function logs 'input#04.update' four times rather than each individual input, which makes sense seeing how closures work but how would I go about targeting each individual input using this. <input type="text" name="" id="01" class="update"> <input type="text" name="" id="02" class="update"> <input type="text" name="" id="03" class="update"> <input type="text" name="" id="04" class="update"> function updateFields(){ $('input.update').each(function(){ $this = $(this); $.ajax({ data: 'id=' + this.id, success: function(resp){ console.log($this); $this.val(resp) } }); }); }

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• Jquery Validation

  - by Yashwant Chavan

  Hi, Is there is any to validate form using jquery on dynamic fields. I am creating form fields dynamically using Jsp. like <input type="text" name="name1" value=""> <input type="text" name="name2" value=""> <input type="text" name="name3" value=""> <input type="text" name="name4" value=""> so on.... I want to validate this form fields with required form field.

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• I'm trying to do a solr search such that results are shown if a certain field has ANY value

  - by Akeem

  I'm running a search with a type field. I'd like to show results of a certain type ONLY if two other field have values for them. So in my filter query I thought it would be(type:sometype AND field1:* AND field2:*) but wildcard queries can't start with the *.

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• Submit POST form from url

  - by Martijn Van Mierloo

  Website: www.example.com <form method="POSt" action="" > <input type="hidden" name="test1" value="test11" /> <input type="hidden" name="test2" value="" /> <input type="hidden" name="test3" value="test33" /> <input type="submit" value="Submit"> </form> I want to sumbit this form with adding the correct parameters in the URL. With GET, I can simply use : http://ww.example.com/?test1=test11&test2=&test3=test33 and the form will be sumbitted. Can I do the same for a POST? If so, how? Thanks

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• question on reverse array

  - by davit-datuashvili

  we know algorithm how reverse array of n integers for (int i=0;i<n/2;i++){ swap(a[i],a[n-1-i]): } is this method better according the speed of algorithm or not because swap using xor is more fast then in other method here is code public class swap { public static void main(String[]args){ int a[]=new int[]{2,4,5,7,8,11,13,12,14,24}; System.out.println(" array at the begining:"); for (int i=0;i<a.length;i++){ System.out.println(a[i]); } for (int j=0;j<a.length/2;j++){ a[j]^=a[a.length-1-j]; a[a.length-1-j]^=a[j]; a[j]^=a[a.length-1-j]; } System.out.println("reversed array:"); for (int j=0;j<a.length;j++){ System.out.println(a[j]); } } } Result: array at the begining: 2 4 5 7 8 11 13 12 14 24 reversed array: 24 14 12 13 11 8 7 5 4 2

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• How to submit the correct div elements (not the div that's hidden)?

  - by user356651

  Hello, I have the following code working fine but the problem is that it always submits the first div (article) even though it's hidden. My question is how do I submit the form and the elements in the form in the div that's shown? (if I select Music radiobutton, I want to submit the input elements of the Music Div not the Article div. Thanks. $(document).ready(function(){ $("input[name$='itemlist']").click(function() { var selection = $(this).val(); $("div.box").hide(); $("#"+selection).show(); }); }); <!--radio buttons--> <div id="articleselection"><input name="itemlist" type="radio" value="article" /> Article/Book </div> <div id="musicselection"><input name="itemlist" type="radio" value="music" /> Music</div> <!--article div starts--> <div id="article" class="box"> <table class="fieldgroup"> <tr><td>Journal Title: <input id="JournalTitle" name="JournalTitle" type="text" size="60" class="f-name" tabindex="1" value="JournalTitle"> </table> <table class="fieldgroup"> <tr><td>Article Author: <input id="ArticleAuthor" name="ArticleAuthor" type="text" size="40" class="f-name" tabindex="2" value="<"ArticleAuthor"></td></tr> </table> </div> <!--music div starts--> <div id="music" class="box"> <table class="fieldgroup"> <tr><td>Music Title: <input id="Music Title" name="Music Title" type="text" size="60" class="f-name" tabindex="1" value="Music Title"> </table> <table class="fieldgroup"> <tr><td> Music Author: <input id="MusicAuthor" name="Music Author" type="text" size="40" class="f-name" tabindex="2" value="<"MusicAuthor"></td></tr> </table> </div>

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• Why each request with activerecord is doing SHOW TABLE?

  - by dynback.com

  My test page is processed if believe to trace in 46 ms, while 11 of them I am doing this 20:53:06.111597 system.db.CDbConnection Opening DB connection 20:53:06.118046 system.db.CDbCommand Querying SQL: SHOW COLUMNS FROM `questions` 20:53:06.122476 system.db.CDbCommand Querying SQL: SHOW CREATE TABLE `questions` Is this obligatory?

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