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• Microsoft Expression Blend 3 - Show / Hide a popup

  - by imayam

  Hi, I'm using this for the very first time to do some quick prototyping (using sketchflow). I have a simple dialog window that I want to show when a button it pressed and then hide when a button (in the dialog, like an "OK" button) is pressed. If someone could just point me in the direction of a simple tutorial on how to do this I'd be happy, or even if you have a simple example you can post here that would be great (I've been trying to google this forever!). I can tell you what I have tried (although obviously it doesn't work) Created a user control, called it "MyDialog". That user control is a simple box which is the bit of gui I want to overlay when the user clicks a button. In that user control I gave it two states "Show" and "Hide". The "Hide" state has all visability to the elements in this user control set to none and "Show" shows everything Created a button in my main screen. That button I gave a it a behaviour "ActivateStateAction". In the properties of that behaviour I set the TargetScreen to be "MyDialog" and the TargetState to be "Show". (I also set the target screen to be MyprojectName.MyProjectNameScreens.MyDialog, that doesn't work either)

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• Get an IDataReader from a typed List

  - by Jason Kealey

  I have a List<MyObject> with a million elements. (It is actually a SubSonic Collection but it is not loaded from the database). I'm currently using SqlBulkCopy as follows: private string FastInsertCollection(string tableName, DataTable tableData) { string sqlConn = ConfigurationManager.ConnectionStrings[SubSonicConfig.DefaultDataProvider.ConnectionStringName].ConnectionString; using (SqlBulkCopy s = new SqlBulkCopy(sqlConn, SqlBulkCopyOptions.TableLock)) { s.DestinationTableName = tableName; s.BatchSize = 5000; s.WriteToServer(tableData); s.BulkCopyTimeout = SprocTimeout; s.Close(); } return sqlConn; } I use SubSonic's MyObjectCollection.ToDataTable() to build the DataTable from my collection. However, this duplicates objects in memory and is inefficient. I'd like to use the SqlBulkCopy.WriteToServer method that uses an IDataReader instead of a DataTable so that I don't duplicate my collection in memory. What's the easiest way to get an IDataReader from my list? I suppose I could implement a custom data reader (like here http://blogs.microsoft.co.il/blogs/aviwortzel/archive/2008/05/06/implementing-sqlbulkcopy-in-linq-to-sql.aspx) , but there must be something simpler I can do without writing a bunch of generic code. Edit: It does not appear that one can easily generate an IDataReader from a collection of objects. Accepting current answer even though I was hoping for something built into the framework.

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• Getting the submatrix with maximum sum?

  - by guirgis

  With the help of the Algorithmist and Larry and a modification of Kadane's Algorithm, here is my solution: int dim = matrix.length; //computing the vertical prefix sum for columns int[][] ps = new int[dim][dim]; for (int i = 0; i < dim; i++) { for (int j = 0; j < dim; j++) { if (j == 0) { ps[j][i] = matrix[j][i]; } else { ps[j][i] = matrix[j][i] + ps[j - 1][i]; } } } int maxSoFar = 0; int min , subMatrix; //iterate over the possible combinations applying Kadane's Alg. //int toplefti =0, topleftj=0, bottomrighti=0, bottomrightj=0; for (int i = 0; i < dim; i++) { for (int j = i; j < dim; j++) { min = 0; subMatrix = 0; for (int k = 0; k < dim; k++) { if (i == 0) { subMatrix += ps[j][k]; } else { subMatrix += ps[j][k] - ps[i-1][k]; } if(subMatrix < min){ min = subMatrix; } if((subMatrix - min) > maxSoFar){ maxSoFar = subMatrix - min; } } } } The only problem left is to determine the submatrix elements, i mean the top left and the bottom right corners. I managed to do this in one dimensional case. Any suggestions?

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• ASP.NET AJAX Toolkit - CalendarExtender is reset on Postback

  - by user70192

  Hello, I have an ASP.NET page that has two input elements: A TextBox that is ReadOnly. This TextBox is the TargetControl of a CalendarExtender A DropDownList with AutoPostBack=true Here is the code: <table border="0" cellpadding="0" cellspacing="0"> <tr><td colspan="2">Date:</td></tr> <tr><td colspan="2"> <asp:TextBox ID="dateTextBox" runat="server" ReadOnly="true" /> <ajax:CalendarExtender ID="datePicker" runat="server" Format="MM/dd/yyyy" OnLoad="datePicker_Load" TargetControlID="dateTextBox" /> </td></tr> <tr><td colspan="2">Select an Option:</td></tr> <tr> <td>Name:&nbsp;</td> <td><asp:DropDownList ID="optionsDropDownList" runat="server" AutoPostBack="true" OnLoad="optionsDropDownList_Load" OnSelectedIndexChanged="optionsDropDownList_SelectedIndexChanged" DataTextField="Name" DataValueField="ID" /> </td></tr> <tr><td><asp:Button ID="saveButton" runat="server" Text="Save" OnClick="saveButton_Click" /></td></tr> </table> When the DropDownList posts back, the date selected by the user with the datePicker is reset to the current date. In addition, if I look at the Text property of dateTextBox, it is equal to string.Empty. How do I preserve the date that the user selected on a PostBack?

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• Suppress Null Value Types from Being Emitted by XmlSerializer

  - by Ben Griswold

  Please consider the following Amount value type property which is marked as a nullable XmlElement: [XmlElement(IsNullable=true)] public double? Amount { get ; set ; } When a nullable value type is set to null, the C# XmlSerializer result looks like the following: <amount xsi:nil="true" /> Rather than emitting this element, I would like the XmlSerializer to suppress the element completely. Why? We're using Authorize.NET for online payments and Authorize.NET rejects the request if this null element exists. The current solution/workaround is to not serialize the Amount value type property at all. Instead we have created a complementary property, SerializableAmount, which is based on Amount and is serialized instead. Since SerializableAmount is of type String, which like reference types are suppressed by the XmlSerializer if null by default, everything works great. /// <summary> /// Gets or sets the amount. /// </summary> [XmlIgnore] public double? Amount { get; set; } /// <summary> /// Gets or sets the amount for serialization purposes only. /// This had to be done because setting value types to null /// does not prevent them from being included when a class /// is being serialized. When a nullable value type is set /// to null, such as with the Amount property, the result /// looks like: &gt;amount xsi:nil="true" /&lt; which will /// cause the Authorize.NET to reject the request. Strings /// when set to null will be removed as they are a /// reference type. /// </summary> [XmlElement("amount", IsNullable = false)] public string SerializableAmount { get { return this.Amount == null ? null : this.Amount.ToString(); } set { this.Amount = Convert.ToDouble(value); } } Of course, this is just a workaround. Is there a cleaner way to suppress null value type elements from being emitted?

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• Is there any way to get an ExtJS GridPanel to automatically resize its width, but still be contained

  - by Micah

  I want to include an ExtJS GridPanel inside a larger layout, which in turn must be rendered inside a particular div in some pre-existing HTML that I don't control. From my experiments, it appears that the GridPanel only resizes itself correctly if it's within a Viewport. For instance, with this code the GridPanel automatically resizes: new Ext.Viewport( { layout: 'anchor', items: [ { xtype: 'panel', title: 'foo', layout: 'fit', items: [ { xtype: 'grid', // define the grid here... but if I replace the first three lines with the lines below, it doesn't: new Ext.Panel( { layout: 'anchor', renderTo: 'RenderUntoThisDiv', The trouble is, Viewport always renders directly to the body of the HTML document, and I need to render within a particular div. If there is a way to get the GridPanel to resize itself correctly, despite not being contained in a ViewPort, that would be ideal. If not, if I could get the Viewport to render the elements within the div, I'd be fine with that. All of my ExtJS objects can be contained within the same div. Does anybody know of a way to get a GridPanel to resize itself correctly, but still be contained inside some non-ExtJS-generated HTML?

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• Android: Create spinner programmatically from array

  - by Select0r

  Hi, I'm all new to Android and I'm trying to create a spinner programmatically and feeding it with data from an array, but Eclipse gives me a warning that I can't handle. Here's what I got: This ArrayList holds the elements that should be in the spinner (gets filled from a file later on): ArrayList<String> spinnerArray = new ArrayList<String>(); This is code I found on a site which should create the spinner: Spinner spinner = new Spinner(this); ArrayAdapter spinnerArrayAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, spinnerArray); spinner.setAdapter(spinnerArrayAdapter); Now the second line (ArrayAdapter...) gives me a warning in Eclipse saying "ArrayAdapter is a raw type... References to generic type ArrayAdapter<T> should be parameterized", I have no idea how to fix this (or what that means in the first place :) ). It's just a warning and the App seems to run alright, but I'd still like to understand what's wrong and fix it. Any hint is appreciated. Greetings, Select0r

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• Tables created programmatically don't appear in WebBrowser control

  - by John Hall

  I'm creating HTML dynamically in a WebBrowser control. Most elements seems to appear correctly, with the exception of a table. My code is: var doc = webBrowser1.Document; var body = webBrowser1.Document.Body; body.AppendChild(webBrowser1.Document.CreateElement("hr")); var div = doc.CreateElement("DIV"); var table = doc.CreateElement("TABLE"); var row1 = doc.CreateElement("TR"); var cell1 = doc.CreateElement("TD"); cell1.InnerText = "Cell 1"; row1.AppendChild(cell1); var cell2 = doc.CreateElement("TD"); cell2.InnerText = "Cell 2"; row1.AppendChild(cell2); table.AppendChild(row1); div.AppendChild(table); body.AppendChild(div); body.AppendChild(webBrowser1.Document.CreateElement("hr")); The HTML tags are visible in the OuterHTML property of the body, but all that appears in the browser are the two horizontal rules. If I replace div.AppendChild(table); with div.InnerHtml = table.OuterHtml then everything appears as expected.

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• A tool to aid completion of missing or incomplete source code documentation

  - by Pekka

  I have several finished, older PHP projects with a lot of includes that I would like to document in javadoc/phpDocumentor style. While working through each file manually and being forced to do a code review alongside the documenting would be the best thing, I am, simply out of time constraints, interested in tools to help me automate the task as much as possible. The tool I am thinking about would ideally have the following features: Parse a PHP project tree and tell me where there are undocumented files, classes, and functions/methods (i.e. elements missing the appropriate docblock comment) Provide a method to half-way easily add the missing docblocks by creating the empty structures and, ideally, opening the file in an editor (internal or external I don't care) so I can put in the description. Optional: Automatic recognition of parameter types, return values and such. But that's not really required. The language in question is PHP, though I could imagine that a C/Java tool might be able to handle PHP files after some tweaking. Looking forward to your suggestions! Bounty There are already very good suggestions for this (that I have not yet had the time to check out) to point out the gaps, but none yet providing aid in filling them. I want to give the question some more exposure, maybe there is some sort of a graphical extension to php_codesniffer to achieve the level of automation I'm dreaming of. Looking forward to any additional input!

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• Could not find schema information for the element 'castle'.

  - by Richard77

  Hello! I'm creating a Custom tag in my web.config. I first wrote the following entry under the configSections section. <section name="castle" type="Castle.Windsor.Configuration.AppDomain.CastleSectionHandler, Castle.Windsor" /> But, when I try to create a castle node inside the configuration node as below <castle> <components> </components> </castle> I get the following error message:"*Could not find schema information for the element 'castle*'." "*Could not find schema information for the element 'components'***." Am I missing something? I can't find why. And, if I run the application anyway, I get the following error "Could not find section 'Castle' in the configuration file associated with this domain." Ps.// The sample comes from "Pro ASP.NET MVC Framework"/Steven Sanderson/APress ISBN-13 (pbk): 978-1-4302-1007-8" on page 99. Thank you for the help ============================================================ Since I believe to have done exactly what's said in the book and did not succed, I ask the same question in different terms. How do I add a new node using the above information? ============================================================================= Thank you. I did what you said and do not have the two warnings. However, I've go a big new warning: "The element 'configuration' in namespace 'MyWindsorSchema' has invalid child element 'configSections' in namespace 'MyWindsorSchema'. List of possible elements expected: 'include, properties, facilities, components' in namespace 'MyWindsorSchema'."

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• Android custom media controller using vidtry

  - by Mathias Lin

  I want to use a custom media controller in my Android app and therefore looking at the vidtry code (http://github.com/commonsguy/vidtry), especially Player.java: The sample works fine as it comes. But I want the sample to play the fixed video automatically on app startup (so I don't want to enter a URL). I added: @Override public void onStart() { super.onStart(); address.setText("/sdcard/mydata/category/1/video_agkkr6me.mp4"); go.setEnabled(true); onGo.onClick(go); } Strange thing here is that if I run the app, the audio of the video plays but the image doesn't show. Everything else works fine (progress bar, etc.). I can't figure out the difference between the manual click on the go-button and the programmatic one. I looked at the code and didn't see any difference that might occur between manual and programmatic click. I checked if any elements (esp. surface) might be hidden, but it's not. I even tried a surface.setVisibility(View.INVISIBLE); surface.setVisibility(View.VISIBLE); in case some issue with the redrawing, but no difference. The video image does show when I manually hit the go button, but just not on start up automatically.

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• how to loop through menu and remove class and then add class to current menu item

  - by Jonathan Lyon

  Hi all I have this menu structure that is used to navigate through content slider panels. <div id="menu"> <ul> <li><a href="#1" class="cross-link highlight">Bliss Fine Foods</a></li> <li><a href="#2" class="cross-link">Menus</a></li> <li><a href="#3" class="cross-link">Wines</a></li> <li><a href="#4" class="cross-link">News</a></li> <li><a href="#5" class="cross-link">Contact Us</a></li> </ul> </div> I would like to loop through these elements and remove the highlight class and then add the highlight class to the current / last clicked menu item. Any ideas? Any help would be greatly appreciated. Thanks Jonathan

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• Dynamically create and save image with Django and PIL/Django-Photologue

  - by Travis

  I want to generate a page of html with dynamic content and then save the result as an image as well as display the page to the user. So, user signs up to attend conference and gives their name and org. That data is combined with html/css elements to show what their id badge for the conference will look like (their name and org on top of our conference logo background) for preview. Upon approval, the page is saved on the server to an image format (PNG, PDF or JPG) to be printed onto a physical badge by an admin later. I am using Django and django-photologue powered by PIL. The view might look like this # app/views.py def badgepreview(request, attendee_id): u = User.objects.get(id=attendee_id) name = u.name org = u.org return render_to_response('app/badgepreview.html', {'name':name,'org':org,}, context_instance = RequestContext(request), ) The template could look like this {# templates/app/badgepreview.html #} {% extends "base.html" %} {% block page_body %} <div style='background:url(/site_media/img/logo_bg.png) no-repeat;'> <h4>{{ name }}</h4> <h4>{{ org }}</h4> </div> {% endblock %} simple, but how do I save the result? Or is there a better way to get this done?

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• How to solve validation error on xsi:noNamespaceSchemaLocation in jdoconfig.xml

  - by mamuso

  Since I updated today to GAE 1.7.2.1, I'm having validation errors in eclipse in all my jdoconfig.xml files. I have the default jdoconfig.xml content : [...] <jdoconfig xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig"> [...] And eclipse validation throws: Referenced file contains errors (http://java.sun.com/xml/ns/jdo/jdoconfig). For more information, right click on the message in the Problems View and select "Show Details..." When clicking on details I can see a bunch of lines like: s4s-elt-character: Non-whitespace characters are not allowed in schema elements other than 'xs:appinfo' and 'xs:documentation'. Saw 'var_U = "undefined";'. In different lines and different content in "Saw ... " It occurs in every single project I start using the "New Web Application Project..." from the google plugin. So does anyone have this problem? Any fix?

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• Using JavaScript/jQuery to return a list of CSS selectors based on highlighted text

  - by Bungle

  I've been given some project requirements that involve (ideally) returning a list of CSS selectors based on highlighted text. In other words, a user could do something like this on a page: Click a button to indicate that their next text selection should be recorded. Highlight some text on the page. See a generated list of CSS selectors that correspond to all the elements that contain the highlighted text. Firstly, does this seem like a feasible goal? jQuery makes it easy to use a selector to access a particular element, but I'm not sure if the reverse holds true. If an element lacks an id attribute, I also don't know how you'd return an "optimized" selector - i.e., one that identifies an element uniquely. Maybe crawl up the DOM until you find an ID, then stem the selector from there? Secondly, from a high-level perspective, any ideas on how to go about this? Any tips or tricks that could speed development? I very much appreciate any help. Thanks!

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• Prolog: permutations check and multiple answers

  - by Adrian

  Continuing to learn prolog, I'm trying to write a permutation(L1, L2) predicate. It should return true, only if L1 can be made up of all elements in L2. My code so far is the following: permutation([], []). permutation([H|T], L2) :- remove(L2, H, R), permutation(T, R). Assuming that the predicate remove(L1, X, R) functions correctly, and it removes X from L1, I do not get correct results: ?- permutation([1],[1]). true ; false. ?- permutation([1, 2],[1]). true ; false. ?- permutation([1, 2],[1, 2]). true ; false. ?- permutation([1],[1, 2]). false. What am I missing. Subquestion: What happens when the remove predicate returns two answers? My implementation returns the new, correct list, and then after pressing ; it returns the original list. Which answer does permutation predicate use? ?- remove([1,2,3], 3, R). R = [1, 2] ; R = [1, 2, 3].

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• Android app resets on orientation change, best way to handle?

  - by Anthony Westover

  So I am making a basic chess app to play around with some various elements of android programming and so far I am learning a lot, but this time I am lost. When the orientation of the emulator changes the activity gets reset. Based on my research the same thing will happen anytime the application is paused/interrupted, ie. keyboard change, phone call, hitting the home key etc. Obviously, it is not viable to have a chess game constantly reset, so once again I find myself needing to learn how to fix this problem. My research brings up a few main things, overriding the onPaused method in my Activity, listening for Orientation, Keyboard changes in my manifest (via android:configChanges), using Parcelables, or Serialization. I have looked up a lot of sample code using Pacelables, but to be honest it is too confusing. Maybe coming back tomorrow with fresh eyes will be beneficial, but right now the more I look at Parcelables the less sense it makes. My application utilizes a Board object, which has 64 Cell Objects(in an 8x8 2D array), and each cell has a Piece Object, either an actual piece or null if the space is empty. Assuming that I use either Parcelable or Serialization I am assuming that I would have to Parcelize or Serialize each class, Board, Cell, and Piece. First and foremost, is Parcelable or Serialization even the right thing to be looking at for this problem? If so is either Parcelable or Serializable preferred for this? And am I correct in assuming that each of the three objects would have to be Parceled/Serialized? Finally, does anybody have a link to a simple to understand Parcelable tutorial? Anything to help me understand, and stop further headaches down the road when my application expands even further. Any help would be appreciated.

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• How do you override the opacity of a parent control in WPF?

  - by Metro Smurf

  When you set the opacity on a Grid in WPF, all the child elements appear to inherit its Opacity. How can you have a child element not inherit the parent's opacity? For example, the following parent grid has one child grid in the middle with a background set to red, but the background appears pinkish because of the parent's opacity. I'd like the child grid to have a solid color, non-transparent background: <Grid x:Name="LayoutRoot"> <Grid Background="Black" Opacity="0.5"> <Grid.RowDefinitions> <RowDefinition Height="0.333*"/> <RowDefinition Height="0.333*"/> <RowDefinition Height="0.333*"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="0.333*"/> <ColumnDefinition Width="0.333*"/> <ColumnDefinition Width="0.333*"/> </Grid.ColumnDefinitions> <-- how do you make this child grid's background solid red and not inherit the Opacity/Transparency of the parent grid? --> <Grid Grid.Column="1" Grid.Row="1" Background="Red"/> </Grid> </Grid>

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• CSS positioning inside div

  - by christian

  I am using a div with 2 elements inside and I want to position my 1st element to be vertically aligned top and 2nd element to the bottom of the div. The div is the right portion of my page and equal to the height of my main content. #right { float:right; width: 19%; background:#FF3300; margin-left:2px; padding-bottom: 100%; margin-bottom: -100%; } #right .top { display:block; background-color:#CCCCCC; } #right .bottom { bottom:0px; display:block; background-color:#FFCCFF; height:60px; } HTML: <div id="right"> <span class="top">Top element</span> <span class="bottom"><img src="images/logo_footer1.gif" width="57" height="57" align="left" class="img">&nbsp;<img src="images/logo_footer2.gif" width="57" height="57" align="right" class="img"></span> </div> I want the right div to be like this:

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• jQuery select change/click problem - change doesn't work in IE, click doesn't work in Chrome

  - by dan727

  As the title says, I have a problem with binding to a change in a dropdown select list - it seems that "change" doesn't work with IE(7 or 8), so when I try the alternative and use a "click" event, it works in IE but doesn't work in Chrome! Am I missing something obvious here? Here's my code: //event handler for showing hidden form elements (also ensures only relevant hidden els shown) //IE needs click event instead of change $('.select_change').live("change", function(){ //check if value is other if ($(this).val() == 'other') $(this).parent().find(".hidden").show(); //if user changes select value from other then hide input if ($(this).val() != 'other') $(this).parent().find(".hidden").hide(); return false; }); The dropdown HTML is as follows: <select id="title" name="title" class="validate[required,funcCall[validateNotDefault]] select_change" > <option value="default" selected="selected">Please choose from options</option> <option value="yellow">Yellow</option> <option value="black">Black</option> <option value="chocoloate">Chocolate</option> <option value="other">Other</option> </select>

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• Preloading multiple comboboxes/listbox itemssource with enumerated values using WCF RIA Services

  - by Dale Halliwell

  I would like to be able to load several RIA entitysets in a single call without chaining/nesting several small LoadOperations together so that they load sequentially. I have several pages that have a number of comboboxes on them. These comboboxes are populated with static values from a database (for example status values). Right now I preload these values in my VM by one method that strings together a series of LoadOperations for each type that I want to load. For example: public void LoadEnums() { context.Load(context.GetMyStatusValues1Query()).Completed += (s, e) => { this.StatusValues1 = context.StatusValues1; context.Load(context.GetMyStatusValues2()).Completed += (s1, e1) => { this.StatusValues2 = context.StatusValues2; context.Load(context.GetMyStatusValues3Query()).Completed += (s2, e2) => { this.StatusValues3 = context.StatusValues3; (....and so on) }; }; }; }; While this works fine, it seems a bit nasty. Also, I would like to know when the last loadoperation completes so that I can load whatever entity I want to work on after this, so that these enumerated values resolve properly in form elements like comboboxes and listboxes. (I think) I can't do this easily above without creating a delegate and calling that on the completion of the last loadoperation. So my question is: does anyone out there know a better pattern to use, ideally where I can load all my static entitysets in a single LoadOperation?

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• Using NSXMLParser with CDATA

  - by Robb

  I'm parsing an RSS feed with NSXMLParser and it's working fine for the title and other strings but one of the elements is an image thats like <!CDATA <a href="http:image..etc> How do I add that as my cell image in my table view? Would I define that as an image type? This is what i'm using to do my parsing: - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{ //NSLog(@"found this element: %@", elementName); currentElement = [elementName copy]; if ([elementName isEqualToString:@"item"]) { // clear out our story item caches... item = [[NSMutableDictionary alloc] init]; currentTitle = [[NSMutableString alloc] init]; currentDate = [ [NSMutableString alloc] init]; currentSummary = [[NSMutableString alloc] init]; currentLink = [[NSMutableString alloc] init]; } } - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{ //NSLog(@"ended element: %@", elementName); if ([elementName isEqualToString:@"item"]) { // save values to an item, then store that item into the array... [item setObject:currentTitle forKey:@"title"]; [item setObject:currentLink forKey:@"link"]; [item setObject:currentSummary forKey:@"description"]; [item setObject:currentDate forKey:@"date"]; [stories addObject:[item copy]]; NSLog(@"adding story: %@", currentTitle); } } - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{ //NSLog(@"found characters: %@", string); // save the characters for the current item... if ([currentElement isEqualToString:@"title"]) { [currentTitle appendString:string]; } else if ([currentElement isEqualToString:@"link"]) { [currentLink appendString:string]; } else if ([currentElement isEqualToString:@"description"]) { [currentSummary appendString:string]; } else if ([currentElement isEqualToString:@"pubDate"]) { [currentDate appendString:string]; } }

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• How do you clean Core Data generated models and code from a project?

  - by Hazmit

  I'm having an extremely annoying problem with Core Data in the iPhone SDK. I would say in general Core Data for the most part appears easy to use and nice to implement. I have a sqlite database that is being used as a read only reference to pull data elements out for an iPhone app. It would seem there are really mysterious issues relating to what seems to be migration of the database to the most recent versions of my schema. Why can't you just clean out your stored objects and models and let a project redo all of it when you compile next? You would think if you setup a stored object model there would be a way to just reset it and recompile. I've tried what feels like a thousand 'tips' that have been the results of hours of google searches and documentation prowling to figure out how to do this. My most recent error during compile time is below. 2010-04-07 18:23:51.891 PE[1962:207] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't merge models with two different entities named 'PElement'' All of this code has been working in the simulator and is only causing me troubles now because I made a change to the schema. I also have the database options for automatically migrating set as below. NSMutableDictionary *optionsDictionary = [NSMutableDictionary dictionary]; [optionsDictionary setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption]; [optionsDictionary setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];

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• jQuery to select where no children or first child is not image

  - by hacker

  I'm trying to dynamically style some elements on my pages. So, if I had the following code: <a href="#"> Select Me </a> <a href="#"> <img src="blah.jpg" /> Don't select me </a> <a href="#"> <div>Don't select me either</div> <img src="blah.jpg" /> </a> <a href="#"> <div>You can select me too.</div> </a> I would like it to select the first and fourth tags. From what I could tell, by using: $("a:first-child") Won't select the first tag because it doesn't have any children (just text). The second tag should not get selected so something like: $("a:first-child").not("img) but that leaves out the first item. EDIT: If there is an IMG anywhere in the A element, don't select it.

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• Compile time Meta-programming, with string literals.

  - by Hassan Syed

  I'm writing some code which could really do with some simple compile time metaprogramming. It is common practise to use empty-struct tags as compile time symbols. I need to decorate the tags with some run-time config elements. static variables seem the only way to go (to enable meta-programming), however static variables require global declarations. to side step this Scott Myers suggestion (from the third edition of Effective C++), about sequencing the initialization of static variables by declaring them inside a function instead of as class variables, came to mind. So I came up with the following code, my hypothesis is that it will let me have a compile-time symbols with string literals use-able at runtime. I'm not missing anything I hope. template<class Instance> class TheBestThing { public: void set_name(const char * name_in) { get_name() = std::string(name_in); } void set_fs_location(const char * fs_location_in) { get_fs_location() = std::string(fs_location_in); } std::string & get_fs_location() { static std::string fs_location; return fs_location; } std::string & get_name() { static std::string name; return name; } }; struct tag {}; int main() { TheBestThing<tag> x; x.set_name("xyz"); x.set_fs_location("/etc/lala"); ImportantObject<x> SinceSlicedBread; }

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