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Articles indexed Tuesday June 8 2010

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  • Compilers behave differently with a null parameter of a generic method

    - by Eyal Schneider
    The following code compiles perfectly with Eclipse, but fails to compile with javac: public class HowBizarre { public static <P extends Number, T extends P> void doIt(P value) { } public static void main(String[] args) { doIt(null); } } I simplified the code, so T is not used at all now. Still, I don't see a reason for the error. For some reason javac decides that T stands for Object, and then complains that Object does not conform to the bounds of T (which is true): HowBizarre.java:6: incompatible types; inferred type argument(s) java.lang.Number,java.lang.Object do not conform to bounds of type variable (s) P,T found : <P,T>void required: void doIt(null); ^ Note that if I replace the null parameter with a non-null value, it compiles fine. Which of the compilers behaves correctly and why? Is this a bug of one of them?

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  • File upload with tdo-miniforms not working

    - by user338109
    I am using the TDO-miniforms plugin for wordpress. I have a form set up that lets the user submit files. The files are successfully uploaded to the tmp-folder, but once the post is created they are not copied into the allocated post folder. The only thing that is created in the folder with a post id is a file called array. It seems like the file holds the binary data of the uploaded files. The “correct” urls are appended to the post content I am running wordpress 2.9.2 on snow leopard using Mamp.

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  • Qt: Printing pageRect and paperRect issues

    - by Pavels
    I have following printing code: void Print(QPrinter *printer) { QPainter q(printer); q.setRenderHint(QPainter::HighQualityAntialiasing, true); q.setPen(QPen(QColor("red"))); q.drawRect(printer->pageRect()); q.drawLine(printer->pageRect().topRight(), printer->pageRect().bottomLeft()); q.setPen(QPen(QColor("blue"))); q.drawRect(printer->paperRect()); q.drawLine(printer->paperRect().topRight(), printer->paperRect().bottomLeft()); } The result is different with QPrintPreviewDialog, rendered PDF, output to printers (HP LaserJet, PdfFactory, PdfCreator). Most of time the resulting rectangle is out of paper. What to do so the output is similar to all printers?

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  • java: assigning object reference IDs for custom serialization

    - by Jason S
    For various reasons I have a custom serialization where I am dumping some fairly simple objects to a data file. There are maybe 5-10 classes, and the object graphs that result are acyclic and pretty simple (each serialized object has 1 or 2 references to another that are serialized). For example: class Foo { final private long id; public Foo(long id, /* other stuff */) { ... } } class Bar { final private long id; final private Foo foo; public Bar(long id, Foo foo, /* other stuff */) { ... } } class Baz { final private long id; final private List<Bar> barList; public Baz(long id, List<Bar> barList, /* other stuff */) { ... } } The id field is just for the serialization, so that when I am serializing to a file, I can write objects by keeping a record of which IDs have been serialized so far, then for each object checking whether its child objects have been serialized and writing the ones that haven't, finally writing the object itself by writing its data fields and the IDs corresponding to its child objects. What's puzzling me is how to assign id's. I thought about it, and it seems like there are three cases for assigning an ID: dynamically-created objects -- id is assigned from a counter that increments reading objects from disk -- id is assigned from the number stored in the disk file singleton objects -- object is created prior to any dynamically-created object, to represent a singleton object that is always present. How can I handle these properly? I feel like I'm reinventing the wheel and there must be a well-established technique for handling all the cases.

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  • Using DataAnnotations with Entity Framework

    - by dcompiled
    I have used the Entity Framework with VS2010 to create a simple person class with properties, firstName, lastName, and email. If I want to attach DataAnnotations like as is done in this blog post I have a small problem because my person class is dynamically generated. I could edit the dynamically generated code directly but any time I have to update my model all my validation code would get wiped out. First instinct was to create a partial class and try to attach annotations but it complains that I'm trying to redefine the property. I'm not sure if you can make property declarations in C# like function declarations in C++. If you could that might be the answer. Here's a snippet of what I tried: namespace PersonWeb.Models { public partial class Person { [RegularExpression(@"(\w|\.)+@(\w|\.)+", ErrorMessage = "Email is invalid")] public string Email { get; set; } /* ERROR: The type 'Person' already contains a definition for 'Email' */ } }

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  • Page not rendering until BackgroundWorker.RunWorkerAsync completes

    - by brainimus
    I have an aspx page that on a button click creates a BackgroundWorker and then calls the RunWorkerAsync method. In my aspx file I have set Async='true' but when I run the application and click the button it appears as though the page waits to refresh until the processing of the BackgroundWorker is done. How do I get control to return to the page (and have the page refresh) after the BackgroundWorker is created and started? BackgroundWorker worker = new BackgroundWorker(); worker.DoWork += RunJob; worker.RunWorkerCompleted += JobCompleted; worker.RunWorkerAsync();

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  • Face Recognition for classifying digital photos?

    - by Jeremy E
    I like to mess around with AI and wanted to try my hand at face recognition the first step is to find the faces in the photographs. How is this usually done? Do you use convolution of a sample image/images or statistics based methods? How do you find the bounding box for the face? My goal is to classify the pictures of my kids from all the digital photos. Thanks in advance.

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  • D_WIN32_WINNT compiler warning with Boost

    - by bobber205
    Not sure what to make of this error. Added -D_WIN32_WINNT=0x0501 to Visual Studio's "Command Line" options under Project Properties but it says it doesn't recognize it and the warning still appears. I am also not sure how to add the Preprocessor Definition. :) Thanks for any help! 1Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. For example: 1- add -D_WIN32_WINNT=0x0501 to the compiler command line; or 1- add _WIN32_WINNT=0x0501 to your project's Preprocessor Definitions.

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  • how to populate an entity you have extended in the Entity Framework?

    - by user169867
    I have an entity in my EDMX that I've extended with a few fields in a partial class like this: public partial class Employee { public string JobName {get;set;} } These properties are for display only. In the above example say the entity has a JobTypeID property. I wish JobName to be populated w/ the name that belongs to that JobTypeID. Is there anyway to query the employee record in EF including the value for the JobName property w/o explicity assigning each field using select()? The reason I ask is that there are a lot of fields in the Employee entity so I'd like to be able to take advantage of something like: ctx.Employees.Where(e=>e.EmployeeID==employeeID).Single() ...add somehow fill in JobName too Is this possible?

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  • How do programmers work together on a project?

    - by Laith J
    Hello, I've always programmed alone, I'm still a student so I never programmed with anyone else, I haven't even used a version control system before. I'm working on a project now that requires knowledge of how programmers work together on a piece of software in a company. How is the software compiled? Is it from the version control system? Is it by individual programmers? Is it periodic? Is it when someone decides to build or something? Are there any tests that are done to make sure it "works"? Anything will do. Thanks.

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  • How to handle inputs in a C shell program during exec

    - by hits_lucky
    I am currently writing my own shell program. This simple shell can just execute commands. When executing commands like vi or calc which require input from the terminal , the command is getting executed and is waiting for the input from the user. But I am unable to give any input on the screen. How should the input be handled during the fork and exec. Here is the piece of code which is executing commands: if((pid = fork()) < 0) { perror("Fork failed"); exit(errno); } if(pid == 0) { // Child process if(execvp(arguments[0], arguments) == -1) { child_status = errno; switch(child_status) { case ENOENT: printf(" command not found \n"); break; } exit(errno); } } else { // parent process int wait_stat; if(waitpid(pid , &wait_stat, WNOHANG) == -1) { printf(" waitpid failed \n"); return; } } } ~ Thanks,

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  • How do I access admin shares on windows 2008 r2?

    - by Jim Geurts
    I am not able to access admin file shares on a Windows 2008 R2 box, if I'm logged in as a user who is part of the Administrators group. The only way I can access those shares is if I use the built in Administrator account. How can I configure the server to allow any administrator to access the file system via admin shares? Btw, this works with Windows 2003. By admin shares, I refer to: \192.168.1.4\c$ or \192.168.1.4\e$

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  • How to get a profile picture from fb:friends selector

    - by malshan
    Im a Newbie to PHP and FBML(Facebook Markup Language).....so now im coding a Facebook app so I need to get profile picture and friend name when I select a name from FB:Friend Selector Select a Friend <fb:friend-selector uid="exclude_ids" name="pal" idname="friend_sel" /> I use exclude_ids to see all friends in my selector so how to get profile picture? I can get name from this but how to get the profile pic large?

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  • HTML / Conditional Comments - Do conditional comments behave as expected across browsers?

    - by John Himmelman
    Do conditional comments behave as expected across browsers? Can they cause rendering bugs or other issues? Are there any errors in the formatting/syntax of this CC? <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="718" height="227" id="swf"> <param name="movie" value="images/swf.swf" /> <!--[if !IE]>--> <object type="application/x-shockwave-flash" data="images/swf.swf" width="718" height="227"> <!--<![endif]--> <img src="images/alt.jpg" border="0" width="718" height="227"> <!--[if !IE]>--> </object> <!--<![endif]--> </object>

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  • Add new row to asp .net grid view using button

    - by SARAVAN
    Hi, I am working in ASP .net 2.0. I am a learner. I have a grid view which has a button in it. Please find the asp mark up below <form id="form1" runat="server"> <div> <asp:GridView ID="myGridView" runat="server"> <Columns> <asp:TemplateField> <ItemTemplate> <asp:Button CommandName="AddARowBelow" Text="Add A Row Below" runat="server" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </div> </form> Please find the code behind below. using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Data; using System.Web.UI.WebControls; namespace GridViewDemo { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { DataTable dt = new DataTable("myTable"); dt.Columns.Add("col1"); dt.Columns.Add("col2"); dt.Columns.Add("col3"); dt.Rows.Add(1, 2, 3); dt.Rows.Add(1, 2, 3); dt.Rows.Add(1, 2, 3); dt.Rows.Add(1, 2, 3); dt.Rows.Add(1, 2, 3); myGridView.DataSource = dt; myGridView.DataBind(); } protected void myGridView_RowCommand(object sender, GridViewCommandEventArgs e) { } } } I was thinking that when I click the command button, it would fire the mygridview_rowcommand() but instead it threw an error as follows: Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" % in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. Can any one let me know on where I am going wrong?

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  • URLLoader.load() issue when using the same URLRequest

    - by Rudy
    Hello, I have an issue with my eventListeners with the URLLoader, but this issue happens in IE, not in FF. public function getUploadURL():void { var request:URLRequest = new URLRequest(); request.url = getPath(); request.method = URLRequestMethod.GET; _loader = new URLLoader(); _loader.dataFormat = URLLoaderDataFormat.TEXT; _loader.addEventListener(Event.COMPLETE, getBaseURL); _loader.load(request); } private function getBaseURL(event:Event):void { _loader.removeEventListener(Event.COMPLETE, getBaseURL); } The issue is that my getBaseURL gets executed automatically after I have executed the code at least once, but that is the case only in IE. What happens is I call my getUploadURL, I make sure the server sends an event that will result in an Event.COMPLETE, so the getBaseURL gets executed, and the listener is removed. If I call the getUploadURL method and put the wrong path, I do not get an Event.COMPLETE but some other event, and getBaseURL should not be executed. That is the correct behavior in FireFox. In IE, it looks like the load() method does not actually call the server, it jumps directly to the getBaseURL() for the Event.COMPLETE. I checked the willTrigger() and hasEventListener() on _loader before assigning the new URLLoader, and it turns out the event has been well removed. I hope I make sense, I simplified my code. To sum up quickly: in FireFox it works well, but in IE, the first call will work but the second call won't really call the .load() method; it seems it uses the previously stored result from the first call. I hope someone can please help me, Thank you, Rudy

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  • Can I use a attribute to make .net impersonate another user?

    - by Rising Star
    I am familiar with impersonating an account in .net by using: dim myIdentity as WindowsIdentity = someIdentity using ctx as WindowsImpersonationContext = myIdentity.Impersonate() doStuff() end using Is it possible to define a .net attribute so that I could write something like: < runAsUser(someIdentity) public sub doStuff() and then have the .net framework always impersonate when running the method doStuff()?

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  • How does one SELECT block another?

    - by Krip
    I'm looking at output of SP_WhoIsActive on SQL Server 2005, and it's telling me one session is blocking another - fine. However they both are running a SELECT. How does one SELECT block another? Shouldn't they both be acquiring shared locks (which are compatible with one another)? Some more details: Neither session has an open transaction count - so they are stand-alone. The queries join a view with a table. They are complex queries which join lots of tables and results in 10,000 or so reads. Any insight much appreciated.

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  • Rails newb syntax question

    - by Veep
    I'm in the console, looking at someone else's app. I come across the following: >> p.location => [#<Tag id: 2, name: "projects">] Why do I see this result, which seems to be the object name, and how do I access the actual attribute name, "projects"? >> p.location.name => "Tag" Thank you very much!

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