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• iText - Modifying PDFWriter# Verticle Alignment manually

  - by simon622

  Ive hit upon a problem using iText (java), despite hours of looking thru the docs.. Most of the code I use goes via the Document# API which tracks (via the PDFWriter instance) the current Y position. HOWEVER, we need to use the PdfContentByte part of the API to insert some Java2d into the document, but in doing so this appears to bypass the logic which tracks verticle writes. So next time I use the Document API, it overwrites the contents of the manually inserted things. I want to mimick the behaviour of the Document# API by manually moving the cursor on N number of units (N being the height of the element inserted by the PDFContentByte API), such that when I then use the Document object again, bingo, its cursor is in the correct location. I can see that a method to obtain the cursor exists; PdfWriter#getVerticalPosition(boolean); But not one to set it?! Any ideas anyone? Thanks.

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• Weighted random selection using Walker's Alias Method (c# implementation)

  - by Chuck Norris

  I was looking for this algorithm (algorithm which will randomly select from a list of elements where each element has different probability of being picked (weight) ) and found only python and c implementations, after I did a C# one, a bit different (but I think simpler) I thought I should share it, and ask your opinion ? this is it: using System; using System.Collections.Generic; using System.Linq; namespace ChuckNorris { class Program { static void Main(string[] args) { var oo = new Dictionary<string, int> { {"A",7}, {"B",1}, {"C",9}, {"D",8}, {"E",11}, }; var rnd = new Random(); var pick = rnd.Next(oo.Values.Sum()); var sum = 0; var res = ""; foreach (var o in oo) { sum += o.Value; if(sum >= pick) { res = o.Key; break; } } Console.WriteLine("result is "+ res); } } } if anyone can remake it in f# please post your code

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• Using WPFPerf to profile a WPF 4.0 application doesn't show me any information

  - by Adrian

  I am trying to use WPFPerf to profile a WPF 4.0 application (I have the latest WPFPerf that should work on WPF 4.0 aps). I start the tool Visual Profiler from WPFPerf, I start my aplication, but after that nothing happens and the element tree from the Visual Profiler is empty. No other error message is shown. Can anyone tell me what am I not doint right? As an additional information, when I try to analize my .exe assembly or any other assembly from my application, I get a BadFormatException saying that the assembly was build with a newer version of .NET. From the download page http://go.microsoft.com/fwlink/?LinkID=191420 I see that this version of WPFPerf should be ok for my app

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• Headers to set for AJAX calls in a custom webserver

  - by ErJab

  I'm writing a custom web server. When I enter the URL of my server in the browser, I get the sample text I write out to the socket in my browser correctly. This is the HTTP response that I write: HTTP/1.1 200 OK\r\n Server: My Server\r\n Date: Blah\r\n \r\n This is some sample text. This appears in my browser correctly when I connect directly to the server entering the URL. However, if I use Ajax (jQuery) to access the same URL and then set the innerHTML of an element on the HTML page, I do not get any data printed. Is there any other header I need to set on my web server so that the browser's XMLHttpRequest object detects the response?

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• Ipad/Iphone UIActionSheet

  - by SteveU

  Hi All, Ive only posted on here a couple of times and people have been very quick and very helpful when responding so thanks. Im trying to use the UIActionsheet element in my Ipad application. But just to confuse matters im using Cocos2d aswell. But here is my problem. If coding the actionsheet with out cocos2d you would use the following code. [actionSheet showInView:self.view]; However because im using cocos2d and there is no views as such the only thing i can think of to reference is the window.. But this is located in the appdelegate class. ive tried [actionSheet showInView:self.Window]; and i get errors any help?

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• css nth-child(2n+1) repaint css after filtering out list items

  - by Michael

  I have a list of 20+ items. The background-color changes using the :nth-child(2n+1) selector. (ie. even item black, odd item white). When I click a button to filter out specific items using the jQuery Isotope plugin it adds a .isotope-hidden class to the items I want to filter out, which changes the position of the list item to 0,0 and opacity to 0. When this happens the remaining items are left with the original black/white background-colors, which are now no longer in order. Does anyone know a way to "repaint' the css using the :nth-child(2n+1) selector on the items that do not contain the .isotope-hidden class. I tried #element tr:not(.isotope-hidden):nth-child(2n+1) with no avail. Any help would be appreciated. Thank you.

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• Initializing links in jqtouch in AJAX loaded content

  - by Cody Caughlan

  I have an iphone web app built in jqtouch, when content is loaded by links ("a" tags) then any content on the next page is parsed by jqtouch and any links are initialized. However, when I load content via an AJAX call and append() it to an element then any links in that content are NOT initialized by jqtouch. Thus any clicks on those links are full-blown clicks to a new resource and are not handled by jqtouch, so at that point you've effectively broken out of jqtouch. My AJAX code is: #data <script type="text/javascript"> $.ajax({ url: '/mobile/nearby-accounts', type: 'GET', dataType: 'html', data: {lat: lat, lng: lng}, success: function(html) { $('#data').empty().append(html); // Is there some method I call on jqtouch to have any links in $('#data') be hooked up to the jqtouch lifecycle? } </script> Thanks in advance.

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• WPF Binding Failure performance hit vs Exception

  - by Aran Mulholland

  when we bind to heterogeneous collection of objects, not all objects have the same set of properties. in the output window we get a message like: System.Windows.Data Error: 39 : BindingExpression path error: 'RoundingFactor' property not found on 'object' ''MultiLineTextMarkingScheme' (HashCode=7262386)'. BindingExpression:Path=RoundingFactor;.......... This doesn't appear to be an exception, but we are concerned it has a performance impact. Should we be concerned and create a view model that has all the properties we wish to bind to (and have the properties that dont exist on the underlying element return null) or can we just leave it. This situation often occurs in a grid scenario where there might be large numbers of these binding failures.

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• C# XDocument Attribute Performance Concerns

  - by Dested

  I have a loaded XDocument that I need to grab all the attributes that equal a certain value and is of a certain element efficiently. My current IEnumerable<XElement> vm; if (!cacher2.TryGetValue(name,out vm)) { vm = project.Descendants(XName.Get(name)); cacher2.Add(name, vm); } XElement[] abdl = (vm.Where(a => a.Attribute(attribute).Value == ab)).ToArray(); cacher2 is a Dictionary<string,IEnumerable<XElement>> The ToArray is so I can evaluate the expression now. I dont think this causes any real speed concerns. The problem is the Where itself. I am searching through anywhere from 1 to 10k items. Any help?

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• jQuery UI sortable('cancel') - this.helper is null

  - by Kerry

  I am trying to disable a sortable element from sorting when it has been double clicked. When I try to disable it, even without a condition, it gives me the error 'this.helper is null'. $('.roundedBox:first', division).sortable({ start: function( event, ui ) { if( true === true ) { $(this).sortable('cancel'); } $(this).parent().data( 'sorting', true ); }, stop: function() { $(this).parent().data( 'sorting', false ); }, items: '.department', update: function() {}, placeholder: 'department-placeholder' }) Any ideas on how I can do this? I don't need it to be this method. Literally anything thing that stops it will work. The problem is, sorting starts on a single click, but I have another action bound to double click. If it's double clicked, I don't want it to drag.

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• XML/XSD intellisense not working in Visual Studio 2010

  - by Jason

  I am working on xml and xsd files in VS 2010 but intellisense isn't working. Intellisense is working for the same files in VS 2008, however. When I type '<xs:' options like "attribute", "complexType", "simpleType", or "element" do not appear. Is there some difference between the VS 2008 and VS 2010 that I'm missing? I add an xsd file to my solution. All the proper namespaces are generated automatically as such: <?xml version="1.0" encoding="utf-8"?> <xs:schema id="XMLSchema2" targetNamespace="http://tempuri.org/XMLSchema2.xsd" elementFormDefault="qualified" xmlns="http://tempuri.org/XMLSchema2.xsd" xmlns:mstns="http://tempuri.org/XMLSchema2.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema"> </xs:schema> The "xsdschema.xsd" is in the "C:\Program Files\Microsoft Visual Studio 10.0\xml\Schemas" directory. There is a check mark in the "Use" column in the XML Schemas dialog box.

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• WPF: How do I debug binding errors?

  - by Jonathan Allen

  I'm getting this in my output Window: System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=VerticalContentAlignment; DataItem=null; target element is 'ListBoxItem' (Name=''); target property is 'VerticalContentAlignment' (type 'VerticalAlignment') This is my XAML, which when run looks correct <GroupBox Header="Grant/Deny Report"> <ListBox ItemsSource="{Binding Converter={StaticResource MethodBinder}, ConverterParameter=GrantDeny, Mode=OneWay}"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <Label Content="{Binding Entity}"/> <Label Content="{Binding HasPermission}"/> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </GroupBox>

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• on hover overlay image in CSS

  - by Juventus

  I need a div with picture bg to overlay an image (with some amount transparency) when hovered on. I need to be able to have one transparent overlay that can be used and reused throughout the site on any image. My first attempt was round-about to say the least. Because I found out you cannot roll-over an invisible div I devised a sandwhich system in which the original image is the first layer, the overlay is the second layer, and the original image is third layer again. This way, when you roll-over, the original image disappears revealing the overlay image over the original image: http://www.nightlylabs.com/uploads/test.html So it works. Kinda. Because of you cannot interact with an visibility:invisible element (why?!) the roll-over flickers unless you rest the cursor on it. Any help? This method is bad so if anyone has a better one please comment.

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• Initializing a Global Struct in C

  - by Scott

  What is the best way to accomplish the following in C? #include <stdio.h> struct A { int x; }; struct A createA(int x) { struct A a; a.x = x; return a; } struct A a = createA(42); int main(int argc, char** argv) { printf("%d\n", a.x); return 0; } When I try to compile the above code, the compiler reports the following error: "initializer element is not constant" The bad line is this one: struct A a = createA(42); Can someone explain what is wrong? I'm not very experienced in C. Thanks!

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• Using DropDownList in EditTemplates of a GridView

  - by vaibhav

  I am working on a GridView in Asp.Net. When initially a the Page Loads, my gridview look like: When a user clicks, to edit a row, I am using edit templates to show 'Domain' in a DropDownList. But problem is , when the DropDownlist gets load with data, it lost the current value of the 'Domain'. i.e If I want to edit 4th Row, its domain which is currently set to 'Computers' is getting changed to 'MBA' which is ofcourse the first element return by the DataSource. I want to display the current value ('computers') as the selected value in DropDownList. But I am unable to get the value of Domain, which is being edited.

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• How do the performance characteristics of jQuery selectors differ from those of CSS selectors?

  - by Moss

  I came across Google's Page Speed add-on for Firebug yesterday. The page about using efficient CSS selectors said to not use overqualified selectors, i.e. use #foo instead of div#foo. I thought the latter would be faster but Google's saying otherwise, and who am I to go against that? So that got me wondering if the same applied to jQuery selectors. This page I found the link to on SO says I should use $("div#foo"), which is what I was doing all along, since I thought that things would speed up by limiting the selector to match div elements only. But is it really better than writing $("#foo") like Google's saying for CSS selectors, or do CSS versus jQuery element matching work in different ways and I should stick with $("div#foo")?

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• StackOverflow Exception in Umanaged Dll When Called from Managed DLL

  - by Ngu Soon Hui

  My question is similar to this one here, but there are some difference. I have a fortran dll as the backend, and a C# exe as the front end. I use PInvoke to pass data between them. There are 22 parameters between the C# and the fortran code. And some of them are integer, double, pointers ( C# pointers), array and whatnot. So it's a mix of types. The problem is that for small arrays, the code works fine, however, for large arrays (~10k element size), a stackoverflowexception was thrown right after my code enters into the managed code. Any idea why this is the case, and how to fix this?

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• Overlay WriteableBitmap with color

  - by rajenk

  I'm trying to overlay a WriteableBitmap with a certain color in Silverlight. I have a black and white base image, which I'm using to create smaller WriteableBitmap images for a new composite image and I want to overlay either the black or white part of the source image cut-out with a certain color before adding it to the composite image. What I'm doing now is: var cutOut = new WriteableBitmap(8, 14); /* cut out the image here */ cutOut.Render(sourceImage, transform); // sourceImage is the base image cutOutImage.Source = cutOut; // cutOutImage is an Image element in XAML compositeImage.Render(cutOutImage, transform2); // compositeImage is the final WriteableBitmap that is shown on screen I tried the methods on http://blogs.silverarcade.com/silverlight-games-101/15/silverlight-blitting-and-blending-with-silverlights-writeablebitmap/ and using the extension methods from hxxp://writeablebitmapex.codeplex.com/, but I cannot seem to get a color overlay on the cutOut image before rendering it to the compositeImage. Does anyone know of a good method to do this? Thanks in advance.

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• linq to xml query returning a list of all child elements

  - by Xience

  I have got an xml document which looks something like this. <Root> <Info>....</Info> <Info>....</Info> <response>....</response> <warning>....</warning> <Info>....</Info> </Root> How can i write a linqToXML query so that it returns me an IEnumerable containing each child element, in this case all five child elements of , so that i could iterate over them. The order of child elements is not definite, neither is number of times the may appear. Thanks in advance

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• Custom Fill Property on PathGeometry in Silverlight

  - by Otaku

  I've been looking at (and getting confused by) Dependency Properties - I'm not sure if this is what I need or if there is something else. I'm looking to something very specific with <Path.Data/> children in Silverlight, in particular <PathGeometry/>, <EllipseGeometry/>, etc. While the <Path/> element has a .Fill property, I'd like to add a .Fill property to any of it's Geometries, meaning it's a different color from it's parent. It could be a <SolidColorBrush/> or <LinearGradientBrush/> color, or a percentage of the parent color (like 20% darker than <Path.Fill/>. Is this possible? Is this a dependency property? How would <RectangleGeometry/>, for example, know that I am trying to fill it with a color? How would I get started? (adding WPF as a tag too as someone who knows WPF may be able to help)

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• Why doesn't @contenteditable work on the iPhone?

  - by plutext

  Safari HTML Reference: Supported Attributes says: contenteditable If true, the element can be edited on the fly; if false, it cannot. Availability Available in Safari 1.2 and later. Available in iPhone OS 1.0 and later. However, on my iPhone, I can't get it to work. Anyone have success with this? You can try it with this document (admittedly not pure html, but that document works in desktop Safari, and Chrome and Firefox 3). I haven't been able to get even the simplest html document to be editable in mobile Safari.

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• Dataset -> XML Document - Load DataSet into an XML Document - C#.Net

  - by NLV

  Hello I'm trying to read a dataset as xml and load it into an XML Document. XmlDocument contractHistoryXMLSchemaDoc = new XmlDocument(); using (MemoryStream ms = new MemoryStream()) { //XmlWriterSettings xmlWSettings = new XmlWriterSettings(); //xmlWSettings.ConformanceLevel = ConformanceLevel.Auto; using (XmlWriter xmlW = XmlWriter.Create(ms)) { xmlW.WriteStartDocument(); dsContract.WriteXmlSchema(xmlW); xmlW.WriteEndDocument(); xmlW.Close(); using (XmlReader xmlR = XmlReader.Create(ms)) { contractHistoryXMLSchemaDoc.Load(xmlR); } } } But I'm getting the error - "Root Element Missing". Any ideas? Update When i do xmlR.ReadInnerXML() it is empty. Does anyone know why? NLV

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• How to access uploaded files in Ruby

  - by Jeff King

  I am trying use a Java Uploader in a ROR app (for its ease of uploading entire directories). The selected uploader comes with some PHP code that saves the files to the server. I am trying to translate this code to Ruby, but am stumped on this point: PHP has a very convenient superglobal – $_FILES – that contains a hash of all files uploaded to the current script via the HTTP POST method. It appears Ruby does not have a similar resource. Lacking that, what is the best way to access and save the uploaded files? I am using the JavaPowUpload uploader ( http://www.element-it.com/OnlineHelpJavaPowUpload/index.html ).

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• WSDL Object model

  - by Swaroop

  I'm using the WSDL object model (WOM) along with XSOM for a project of mine. The WOM gives me a way to drill down and look at messages and the message types which are element declarations. However, I am unable to find a way to parse the simple and complex types. The APIs are tricky. There seems to be some kind of a connection between WOM and XSOM. I'd really appreciate it if you could tell me how I can parse the simple and the complex types in my .wsdl file.

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• Form Elements in ASP.NET Master Pages and Content Pages

  - by Rob Cooper

  OK, another road bump in my current project. I have never had form elements in both my master and content pages, I tend to have all the forms in the content where relevant. In the current project however, we have a page where they want both. A login form at the top right, and a questions form in the content. Having tried to get this in, I have run in to the issue of ASP.NET moaning about the need for a single form element in a master page. TBH, I really dont get why this is a requirement on ASP.NET's part, but hey ho. Does anyone know if/how I can get the master and content pages to contain form elements that work independantly? If not, can you offer advice on how to proceed to get the desired look/functionality?

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