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• Hidden Features of C#?

  - by Serhat Özgel

  This came to my mind after I learned the following from this question: where T : struct We, C# developers, all know the basics of C#. I mean declarations, conditionals, loops, operators, etc. Some of us even mastered the stuff like Generics, anonymous types, lambdas, linq, ... But what are the most hidden features or tricks of C# that even C# fans, addicts, experts barely know? Here are the revealed features so far: Keywords yield by Michael Stum var by Michael Stum using() statement by kokos readonly by kokos as by Mike Stone as / is by Ed Swangren as / is (improved) by Rocketpants default by deathofrats global:: by pzycoman using() blocks by AlexCuse volatile by Jakub Šturc extern alias by Jakub Šturc Attributes DefaultValueAttribute by Michael Stum ObsoleteAttribute by DannySmurf DebuggerDisplayAttribute by Stu DebuggerBrowsable and DebuggerStepThrough by bdukes ThreadStaticAttribute by marxidad FlagsAttribute by Martin Clarke ConditionalAttribute by AndrewBurns Syntax ?? operator by kokos number flaggings by Nick Berardi where T:new by Lars Mæhlum implicit generics by Keith one-parameter lambdas by Keith auto properties by Keith namespace aliases by Keith verbatim string literals with @ by Patrick enum values by lfoust @variablenames by marxidad event operators by marxidad format string brackets by Portman property accessor accessibility modifiers by xanadont ternary operator (?:) by JasonS checked and unchecked operators by Binoj Antony implicit and explicit operators by Flory Language Features Nullable types by Brad Barker Currying by Brian Leahy anonymous types by Keith __makeref __reftype __refvalue by Judah Himango object initializers by lomaxx format strings by David in Dakota Extension Methods by marxidad partial methods by Jon Erickson preprocessor directives by John Asbeck DEBUG pre-processor directive by Robert Durgin operator overloading by SefBkn type inferrence by chakrit boolean operators taken to next level by Rob Gough pass value-type variable as interface without boxing by Roman Boiko programmatically determine declared variable type by Roman Boiko Static Constructors by Chris Easier-on-the-eyes / condensed ORM-mapping using LINQ by roosteronacid Visual Studio Features select block of text in editor by Himadri snippets by DannySmurf Framework TransactionScope by KiwiBastard DependantTransaction by KiwiBastard Nullable<T> by IainMH Mutex by Diago System.IO.Path by ageektrapped WeakReference by Juan Manuel Methods and Properties String.IsNullOrEmpty() method by KiwiBastard List.ForEach() method by KiwiBastard BeginInvoke(), EndInvoke() methods by Will Dean Nullable<T>.HasValue and Nullable<T>.Value properties by Rismo GetValueOrDefault method by John Sheehan Tips & Tricks nice method for event handlers by Andreas H.R. Nilsson uppercase comparisons by John access anonymous types without reflection by dp a quick way to lazily instantiate collection properties by Will JavaScript-like anonymous inline-functions by roosteronacid Other netmodules by kokos LINQBridge by Duncan Smart Parallel Extensions by Joel Coehoorn

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• Using SSIS Web Service Task with WCF

  - by Omri

  Hello, I am using SQL Server 2008 SSIS for importing data to the DB and .Net 3.5 SP1 for Creating the WCF service. In the import task I am trying to use the Web Service Task to report to a WCF service. At first I encountered a problem with the WCF WSDL, the Web Service task couldn't get their code generated from the metadata exposed by the WCF service. So I found a blog post at Christian Weyer's Blog talking just about that. Now after I can successfully load a WCF service to the Web Service Task and get the functions generated just fine from the WSDL I encountered another problem. I get an error from the SSIS package at runtime saying that "Method 'ProxyNamespace.MyService.GetData' not found." The full Error is: Error: 0xC002F304 at Web Service Task False, Web Service Task: An error occurred with the following error message: "Microsoft.SqlServer.Dts.Tasks.WebServiceTask.WebserviceTaskException: Could not execute the Web method. The error is: Method 'ProxyNamespace.MyService.GetData' not found.. at Microsoft.SqlServer.Dts.Tasks.WebServiceTask.WebMethodInvokerProxy.InvokeMethod(DTSWebMethodInfo methodInfo, String serviceName, Object connection) at Microsoft.SqlServer.Dts.Tasks.WebServiceTask.WebServiceTaskUtil.Invoke(DTSWebMethodInfo methodInfo, String serviceName, Object connection, VariableDispenser taskVariableDispenser) at Microsoft.SqlServer.Dts.Tasks.WebServiceTask.WebServiceTask.executeThread()". I know that the simple solution is going back to regular Web Service, but I really don't want to go there. Thanks, Omri.

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• .NET C#: WebBrowser control Navigate() does not load targeted URL

  - by Dave

  Hey guys, I'm trying to programmatically load a web page via the WebBrowser control with the intent of testing the page & it's JavaScript functions. Basically, I want to compare the HTML & JavaScript run through this control against a known output to ascertain whether there is a problem. However, I'm having trouble simply creating and navigating the WebBrowser control. The code below is intended to load the HtmlDocument into the WebBrowser.Document property: WebBrowser wb = new WebBrowser(); wb.AllowNavigation = true; wb.Navigate("http://www.google.com/"); When examining the web browser's state via Intellisense after Navigate() runs, the WebBrowser.ReadyState is 'Uninitialized', WebBrowser.Document = null, and it overall appears completely unaffected by my call. On a contextual note, I'm running this control outside of a Windows form object: I do not need to load a window or actually look at the page. Requirements dictate the need to simply execute the page's JavaScript and examine the resultant HTML. Any suggestions are greatly appreciated, thanks!

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• Writing a Javascript library that is code-completion and code-inspection friendly

  - by Vivin Paliath

  I recently made my own Javascript library and I initially used the following pattern: var myLibrary = (function () { var someProp = "..."; function someFunc() { ... } function someFunc2() { ... } return { func: someFunc, fun2: someFunc2, prop: someProp; } }()); The problem with this is that I can't really use code completion because the IDE doesn't know about the properties that the function literal is returning (I'm using IntelliJ IDEA 9 by the way). I've looked at jQuery code and tried to do this: (function(window, undefined) { var myLibrary = (function () { var someProp = "..."; function someFunc() { ... } function someFunc2() { ... } return { func: someFunc, fun2: someFunc2, prop: someProp; } }()); window.myLibrary = myLibrary; }(window)); I tried this, but now I have a different problem. The IDE doesn't really pick up on myLibrary either. The way I'm solving the problem now is this way: var myLibrary = { func: function() { }, func2: function() { }, prop: "" }; myLibrary = (function () { var someProp = "..."; function someFunc() { ... } function someFunc2() { ... } return { func: someFunc, fun2: someFunc2, prop: someProp; } }()); But that seems kinda clunky, and I can't exactly figure out how jQuery is doing it. Another question I have is how to handle functions with arbitrary numbers of parameters. For example, jQuery.bind can take 2 or 3 parameters, and the IDE doesn't seem to complain. I tried to do the same thing with my library, where a function could take 0 arguments or 1 argument. However, the IDE complains and warns that the correct number of parameters aren't being sent in. How do I handle this?

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• Self hosted WCF ServiceHost/WebServiceHost Concurrency/Peformance Design Options (.NET 3.5)

  - by Kyle

  So I'll be providing a few functions via a self hosted (in a WindowsService) WebServiceHost (not sure how to process HTTP GET/POST with ServiceHost), one of which may be called a large amount of the time. This function will also rely on a connection in the appdomain (hosted by the WindowsService so it can stay alive over multiple requests). I have the following concerns and would be oh so thankful for any input/thoughts/comments: Concurrent access - how does the WebServiceHost handle a bunch of concurrent requests. Are they queued and processes sequentially or are new instances of the contracts automagically created? WebServiceHost - WindowsService communication - I need some form of communication from the WebServiceHost to the hosting WindowsService for things like requesting a new session if one does not exist. Perhaps implementing a class which extends the WebServiceHost with events which the WindowsService subscribes to... (unless there is another way I can set off an event in the WindowsService when a request is made...) Multiple WebServiceHosts or Contracts - Would it give any real performance gain to be running multiple WebServiceHost instances in different threads (one per endpoint perhaps?) - A better understanding of the first point would probably help here. WSDL - I'm not sure why (probably just need to do more reading), but I'm not sure how to get the WebServiceHost base endpoint to respond with a WDSL document describing the available contract. Not required as all the operations will be done via GET requests which will not likely change, but it would be nice to have... That's about it for the moment ;) I've been reading a lot on WCF and wish I'd gotten into it long ago, but definitely still learning.

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• ASP.NET MVC search box: use modal popup or inline div or redirect to another page?

  - by JK

  I have a view with a textbox and a search button, eg CustomerTextBox and CustomerSearchButton. The list of customers is too long to display in a dropdown, and there has to be advanced search functions anyway. What is the best practice in MVC to handle this case? When the user clicks on the search button, should it: A. Load another view into a modal popup (eg /customers/search)? How would you do this in MVC, just set popupWindow.location.href = '/customers/search'? How would you return the value to the main view? B. Have the search form in a hidden div that expands when the search button is clicked? How would be done? a partial view maybe? C. Redirect the user to a search page by means of RedirectTo("/customers/search")? How would you return the value to the main class? I've only been doing MVC for 3 days so thanks to those who answer my questions that might have quite obvious answers that I cant see yet. :)

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• E2251 Ambiguous overloaded call to ....

  - by Eric M

  I inherited some Delphi components/code that currently compiles with C++ Builder 2007. I'm simply now trying to compile the components with C++ Builder RAD XE. I don't know Delphi (object pascal). Here are the versions of the 'Supports' functions that appear to be in conflict. Is there a compiler switch I can use to make RAD XE backward compatible? Or is there something I can do to these function calls to correct the ambiguous nature? {$IFNDEF DELPHI5} procedure FreeAndNil(var Obj); var Temp: TObject; begin Temp := TObject(Obj); Pointer(Obj) := nil; Temp.Free; end; function Supports(const Instance: IUnknown; const Intf: TGUID; out Inst): Boolean; overload; begin Result := (Instance <> nil) and (Instance.QueryInterface(Intf, Inst) = 0); end; function Supports(Instance: TObject; const Intf: TGUID; out Inst): Boolean; overload; var Unk: IUnknown; begin Result := (Instance <> nil) and Instance.GetInterface(IUnknown, Unk) and Supports(Unk, Intf, Inst); end; {$ENDIF} {$IFNDEF DELPHI6} function Supports(const Instance: TObject; const IID: TGUID): Boolean; var Temp: IUnknown; begin Result := Supports(Instance, IID, Temp); end; {$ENDIF}

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• OO Design - polymorphism - how to design for handing streams of different file types

  - by Kache4

  I've little experience with advanced OO practices, and I want to design this properly as an exercise. I'm thinking of implementing the following, and I'm asking if I'm going about this the right way. I have a class PImage that holds the raw data and some information I need for an image file. Its header is currently something like this: #include <boost/filesytem.hpp> #include <vector> namespace fs = boost::filesystem; class PImage { public: PImage(const fs::path& path, const unsigned char* buffer, int bufferLen); const vector<char> data() const { return data_; } const char* rawData() const { return &data_[0]; } /*** other assorted accessors ***/ private: fs::path path_; int width_; int height_; int filesize_; vector<char> data_; } I want to fill the width_ and height_ by looking through the file's header. The trivial/inelegant solution would be to have a lot of messy control flow that identifies the type of image file (.gif, .jpg, .png, etc) and then parse the header accordingly. Instead of using vector<char> data_, I was thinking of having PImage use a class, RawImageStream data_ that inherits from vector<char>. Each type of file I plan to support would then inherit from RawImageStream, e.g. RawGifStream, RawPngStream. Each RawXYZStream would encapsulate the respective header-parsing functions, and PImage would only have to do something like height_ = data_.getHeight();. Am I thinking this through correctly? How would I create the proper RawImageStream subclass for data_ to be in the PImage ctor? Is this where I could use an object factory? Anything I'm forgetting?

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• SmartGWT - Update ListGridRecord dynamically

  - by Haylwood

  I am using SmartGWT and I have a ListGrid populated with an array of ListGridRecords using the setData() call. I am trying to update a progress property of a single record (on a timer for testing) and have it update in the browser. I have tried various combinations of draw(), redraw(), markForRedraw() etc. to no avail. I also tried overriding the updateRecordComponent() method in my table class, but it only gets called when the records are first created (after createRecordComponent()). I should note that I do NOT want to accomplish this by binding to a DataSource. I just want to be able to update the attribute on the client-side. ArrayList<SegmentSortRecord> mRecords; mRecords.add(new SegmentSortRecord("03312010_M001_S004")); mRecords.add(new SegmentSortRecord("03312010_M001_S005")); mRecords.add(new SegmentSortRecord("03312010_M001_S006")); mRecords.add(new SegmentSortRecord("03312010_M001_S007")); SegmentSortRecord[] records = new SegmentSortRecord[mRecords.size()]; mRecords.toArray(records); mSortProgressTable.setData(records); . . . mTestTimer = new Timer() { public void run() { mTestPercent += 5; if (mTestPercent <= 100) { mSortProgressTable.getRecord(2).setAttribute(Constants.PROGRESS_COL_NAME, mTestPercent); //mSortProgressTable.markForRedraw(); //mSortProgressTable.redraw(); } else { mTestPercent = 0; } } }; ... @Override protected Canvas createRecordComponent(final ListGridRecord aRecord, Integer aColumn) { String fieldName = getFieldName(aColumn); // Want to override the behavior for rendering the "progress" field if (fieldName.equals(Constants.PROGRESS_COL_NAME)) { Progressbar bar = new Progressbar(); bar.setBreadth(10); bar.setLength(100); // The JavaScript record object contains attributes that we can // access via 'getAttribute' functions. bar.setPercentDone(aRecord.getAttributeAsInt(Constants.PROGRESS_COL_NAME)); return bar; } Thanks in advance for any help.

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• Show/Hide RichFaces component onclick client-side? (without AJAX)

  - by Dolph Mathews

  I'm looking for a way to show/hide an arbitrary RichFaces component. In this case, I have a <rich:dataTable> that contains several rows. Each row needs to have it's own, independent Show/Hide link, such that when you click "Show details", two things happen: The "Show details" link is re-rendered as "Hide details" The associated detailsColumn is displayed. Furthermore, detailsColumns should be hidden by default (effectively rendered="true" to the client but hidden with style="display: none;"). I don't want to write my own JavaScript functions if it's not absolutely necessary. I also don't want to have a server-side bean keep track of which detailColumns are being displayed, and subsequently re-render everything over AJAX: this should be purely client-side behavior. I'm not sure how to accomplish that. The following pseudo-code (hopefully) illustrates my goal: <rich:column> <a href="#" onclick="#{thisRow.detailsColumn}.show();" rendered="">Show details</a> <a href="#" onclick="#{thisRow.detailsColumn}.hide();" rendered="">Hide details</a> </rich:column> <rich:column> <h:outputText value="#{thisRow.someData}" /> </rich:column> <rich:column id="detailsColumn" colspan="2" breakBefore="true"> <h:outputText value="#{thisRow.someMoreData}" /> </rich:column>

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• Error Handling in T-SQL Scalar Function

  - by hydroparadise

  Ok.. this question could easily take multiple paths, so I will hit the more specific path first. While working with SQL Server 2005, I'm trying to create a scalar funtion that acts as a 'TryCast' from varchar to int. Where I encounter a problem is when I add a TRY block in the function; CREATE FUNCTION u_TryCastInt ( @Value as VARCHAR(MAX) ) RETURNS Int AS BEGIN DECLARE @Output AS Int BEGIN TRY SET @Output = CONVERT(Int, @Value) END TRY BEGIN CATCH SET @Output = 0 END CATCH RETURN @Output END Turns out theres all sorts of things wrong with this statement including "Invalid use of side-effecting or time-dependent operator in 'BEGIN TRY' within a function" and "Invalid use of side-effecting or time-dependent operator in 'END TRY' within a function". I can't seem to find any examples of using try statements within a scalar function, which got me thinking, is error handling in a function is possible? The goal here is to make a robust version of the Convert or Cast functions to allow a SELECT statement carry through depsite conversion errors. For example, take the following; CREATE TABLE tblTest ( f1 VARCHAR(50) ) GO INSERT INTO tblTest(f1) VALUES('1') INSERT INTO tblTest(f1) VALUES('2') INSERT INTO tblTest(f1) VALUES('3') INSERT INTO tblTest(f1) VALUES('f') INSERT INTO tblTest(f1) VALUES('5') INSERT INTO tblTest(f1) VALUES('1.1') SELECT CONVERT(int,f1) AS f1_num FROM tblTest DROP TABLE tblTest It never reaches point of dropping the table because the execution gets hung on trying to convert 'f' to an integer. I want to be able to do something like this; SELECT u_TryCastInt(f1) AS f1_num FROM tblTest fi_num __________ 1 2 3 0 5 0 Any thoughts on this? Is there anything that exists that handles this? Also, I would like to try and expand the conversation to support SQL Server 2000 since Try blocks are not an option in that scenario. Thanks in advance.

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• Why is jQuery so widely adopted versus other Javascript frameworks?

  - by Andrew Moore

  I manage a group of programmers. I do value my employees opinion but lately we've been divided as to which framework to use on web projects. I personally favor MooTools, but some of my team seems to want to migrate to jQuery because it is more widely adopted. That by itself is not enough for me to allow a migration. I have used both jQuery and MooTools. This particular essay tends to reflect how I feel about both frameworks. jQuery is great for DOM Manipulation, but seem to be limited to helping you do that. Feature wise, both jQuery and MooTools allow for easy DOM Selection and Manipulation: // jQuery $('#someContainer div[class~=dialog]') .css('border', '2px solid red') .addClass('critical'); // MooTools $('#someContainer div[class~=dialog]') .setStyle('border', '2px solid red') .addClass('critical'); Both jQuery and MooTools allow for easy AJAX: // jQuery $('#someContainer div[class~=dialog]') .load('/DialogContent.html'); // MooTools (Using shorthand notation, you can also use Request.HTML) $('#someContainer div[class~=dialog]') .load('/DialogContent.html'); Both jQuery and MooTools allow for easy DOM Animation: // jQuery $('#someContainer div[class~=dialog]') .animate({opacity: 1}, 500); // MooTools (Using shorthand notation, you can also use Fx.Tween). $('#someContainer div[class~=dialog]') .set('tween', {duration: 500}) .tween('opacity', 1); jQuery offers the following extras: Large community of supporters Plugin Repository Integration with Microsoft's ASP.NET and VisualStudio Used by Microsoft, Google and others MooTools offers the following extras: Object Oriented Framework with Classic OOP emulation for JS Extended native objects Higher consistency between browsers for native functions support. More easy code reuse Used by The World Wide Web Consortium, Palm and others. Given that, it seems that MooTools does everything jQuery does and more (some things I cannot do in jQuery and I can in MooTools) but jQuery has a smaller learning curve. So the question is, why did you or your team choose jQuery over another JavaScript framework? Note: While I know and admit jQuery is a great framework, there are other options around and I'm trying to take a decision as to why jQuery should be our choice versus what we use right now (MooTools)?

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• Context migration in CUDA.NET

  - by Vyacheslav

  I'm currently using CUDA.NET library by GASS. I need to initialize cuda arrays (actually cublas vectors, but it doesn't matters) in one CPU thread and use them in other CPU thread. But CUDA context which holding all initialized arrays and loaded functions, can be attached to only one CPU thread. There is mechanism called context migration API to detach context from one thread and attach it to another. But i don't how to properly use it in CUDA.NET. I tried something like this: class Program { private static float[] vector1, vector2; private static CUDA cuda; private static CUBLAS cublas; private static CUdeviceptr ptr; static void Main(string[] args) { cuda = new CUDA(false); cublas = new CUBLAS(cuda); cuda.Init(); cuda.CreateContext(0); AllocateVectors(); cuda.DetachContext(); CUcontext context = cuda.PopCurrentContext(); GetVectorFromDeviceAsync(context); } private static void AllocateVectors() { vector1 = new float[]{1f, 2f, 3f, 4f, 5f}; ptr = cublas.Allocate(vector1.Length, sizeof (float)); cublas.SetVector(vector1, ptr); vector2 = new float[5]; } private static void GetVectorFromDevice(object objContext) { CUcontext localContext = (CUcontext) objContext; cuda.PushCurrentContext(localContext); cuda.AttachContext(localContext); //change vector somehow vector1[0] = -1; //copy changed vector to device cublas.SetVector(vector1, ptr); cublas.GetVector(ptr, vector2); CUDADriver.cuCtxPopCurrent(ref localContext); } private static void GetVectorFromDeviceAsync(CUcontext cUcontext) { Thread thread = new Thread(GetVectorFromDevice); thread.IsBackground = false; thread.Start(cUcontext); } } But execution fails on attempt to copy changed vector to device because context is not attached? Any ideas how i can get it work?

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• Log in/out of Gmail chat programmatically, clicking Gmail's span "links"

  - by endolith

  At work, I use Gmail's chat, since it's encrypted and logs chats without installing or saving anything to the hard drive. At home, I use Pidgin. When I log into GMail at home, I have to log out of chat, or messages will end up in the wrong place. When I log into GMail at work, I have to log back in to chat. In other words, when I start Firefox at home, I want Gmail's chat disabled automatically. When I start Firefox at work, I want Gmail's chat enabled automatically. Is there a way to use a Greasemonkey script or similar to force logging in and logging out on specific machines? It would seem simple enough; just follow a URL or simulate clicking a link. Unfortunately, Gmail doesn't use actual links. While logged out: <span tabindex="0" role="link" action="si" class="az9OKd">Sign into chat</span> While logged in, in drop-down menu: <div tabindex="-1" id=":1mj" role="menuitem" class="oA" value="si"><div class="uQ c6"/>Sign into chat</div> <div tabindex="-1" id=":8f" role="menuitem" class="oA" value="sia"><div class="uQ c5"/>Sign into AIM®</div> <div tabindex="-1" id=":8e" role="menuitem" class="oA" value="so"><div class="uQ df"/>Sign out of chat</div> At bottom of page: <span id=":im" class="l8 ou" tabindex="0" role="link">turn off chat</span> <span id=":im" class="l8 ou" tabindex="0" role="link">turn on chat</span> Anyone know how to "click" these non-links with JavaScript or access their functions? I would imagine that "so" means "sign out", "si" means "sign in", and "sia" means "sign in AIM". Can I somehow call these actions directly? Is there some other alternative for disabling chat?

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• Interpolation and Morphing of an image in labview and/or openCV

  - by Marc

  I am working on an image manipulation problem. I have an overhead projector that projects onto a screen, and I have a camera that takes pictures of that. I can establish a 1:1 correspondence between a subset of projector coordinates and a subset of camera pixels by projecting dots on the screen and finding the centers of mass of the resulting regions on the camera. I thus have a map proj_x, proj_y <-- cam_x, cam_y for scattered point pairs My original plan was to regularize this map using the Mathscript function griddata. This would work fine in MATLAB, as follows [pgridx, pgridy] = meshgrid(allprojxpts, allprojypts) fitcx = griddata (proj_x, proj_y, cam_x, pgridx, pgridy); fitcy = griddata (proj_x, proj_y, cam_y, pgridx, pgridy); and the reverse for the camera to projector mapping Unfortunately, this code causes Labview to run out of memory on the meshgrid step (the camera is 5 megapixels, which apparently is too much for labview to handle) I then started looking through openCV, and found the cvRemap function. Unfortunately, this function takes as its starting point a regularized pixel-pixel map like the one I was trying to generate above. However, it made me hope that functions for creating such a map might be available in openCV. I couldn't find it in the openCV 1.0 API (I am stuck with 1.0 for legacy reasons), but I was hoping it's there or that someone has an easy trick. So my question is one of the following 1) How can I interpolate from scattered points to a grid in openCV; (i.e., given z = f(x,y) for scattered values of x and y, how to fill an image with f(im_x, im_y) ? 2) How can I perform an image transform that maps image 1 to image 2, given that I know a scattered mapping of points in coordinate system 1 to coordinate system 2. This could be implemented either in Labview or OpenCV. Note: I am tagging this post delaunay, because that's one method of doing a scattered interpolation, but the better tag would be "scattered interpolation"

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• Label in PyQt4 GUI not updating with every loop of FOR loop

  - by user297920

  I'm having a problem, where I wish to run several command line functions from a python program using a GUI. I don't know if my problem is specific to PyQt4 or if it has to do with my bad use of python code. What I wish to do is have a label on my GUI change its text value to inform the user which command is being executed. My problem however, arises when I run several commands using a for loop. I would like the label to update itself with every loop, however, the program is not updating the GUI label with every loop, instead, it only updates itself once the entire loop is completed, and displays only the last command that was executed. I am using PyQt4 for my GUI environment. And I have established that the text variable for the label is indeed being updated with every loop, but, it is not actually showing up visually in the GUI. Is there a way for me to force the label to update itself? I have tried the update() and repaint() methods within the loop, but they don't make any difference. I would really appreciate any help. Thank you. Ronny. Here is the code I am using: # -*- coding: utf-8 -*- import sys, os from PyQt4 import QtGui, QtCore Gui = QtGui Core = QtCore # ================================================== CREATE WINDOW OBJECT CLASS class Win(Gui.QWidget): def __init__(self, parent = None): Gui.QWidget.__init__(self, parent) # --------------------------------------------------- SETUP PLAY BUTTON self.but1 = Gui.QPushButton("Run Commands",self) self.but1.setGeometry(10,10, 200, 100) # -------------------------------------------------------- SETUP LABELS self.label1 = Gui.QLabel("No Commands running", self) self.label1.move(10, 120) # ------------------------------------------------------- SETUP ACTIONS self.connect(self.but1, Core.SIGNAL("clicked()"), runCommands) # ======================================================= RUN COMMAND FUNCTION def runCommands(): for i in commands: win.label1.setText(i) # Make label display the command being run print win.label1.text() # This shows that the value is actually # changing with every loop, but its just not # being reflected in the GUI label os.system(i) # ======================================================================== MAIN # ------------------------------------------------------ THE TERMINAL COMMANDS com1 = "espeak 'senntence 1'" com2 = "espeak 'senntence 2'" com3 = "espeak 'senntence 3'" com4 = "espeak 'senntence 4'" com5 = "espeak 'senntence 5'" commands = (com1, com2, com3, com4, com5) # --------------------------------------------------- SETUP THE GUI ENVIRONMENT app = Gui.QApplication(sys.argv) win = Win() win.show() sys.exit(app.exec_())

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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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• How to use "this" and not "this" selectors in jQuery

  - by tg4FSI

  I have 4 divs with content like below: <div class="prodNav-Info-Panel">content</div> <div class="prodNav-Usage-Panel">content</div> <div class="prodNav-Guarantee-Panel">content</div> <div class="prodNav-FAQ-Panel">content</div> And a navigation list like this: <div id="nav"> <ul id="navigation"> <li><a class="prodNav-Info" ></a></li> <li><a class="prodNav-Usage" ></a></li> <li><a class="prodNav-Guarantee"></a></li> <li><a class="prodNav-FAQ" ></a></li> </ul> </div> When the page is first displayed I show all the content by executing this: $('div.prodNav-Usage-Panel').fadeIn('slow'); $('div.prodNav-Guarantee-Panel').fadeIn('slow'); $('div.prodNav-FAQ-Panel').fadeIn('slow'); $('div.prodNav-Info-Panel').fadeIn('slow'); Now, when you click the navigation list item it reveals the clicked content and hides the others, like this: $('.prodNav-Info').click( function() { $('div.prodNav-Info-Panel').fadeIn('slow'); $('div.prodNav-Usage-Panel').fadeOut('slow'); $('div.prodNav-Guarantee-Panel').fadeOut('slow'); $('div.prodNav-FAQ-Panel').fadeOut('slow'); }); So what I have is 4 separate functions because I do not know which content is currently displayed. I know this is inefficient and can be done with a couple of lines of code. It seems like there is a way of saying: when this is clicked, hide the rest. Can I do this with something like $(this) and $(not this)? Thanks, Erik

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• HL7 parsing in PHP

  - by Narcissus

  Hi all, I'm looking into options for parsing HL7 messages via PHP. I'm aware of the Net_HL7 package on PEAR but to be perfectly honest, I don't think that I want to base my code around a seemingly 'abandoned' package and even if I did, I just don't think that my brain suits the functions 'correctly'. Maybe if I had more of an HL7 background it would make a bit more sense, I don't know. Anyway: I'm guessing that 95% of the time, I'm going to be parsing and reading data from messages. The other 5%, I'll be creating and/or sending messages. I don't necessarily need to do any form of validation on the messages themselves, I just need to pull/push data. I definitely need support for 'non-XML' HL7 v2.x, but naturally XML-based v2 and v3 would be a bonus. So does anyone have any suggestions as to other libraries that I might use? I'm looking for pure PHP solutions as I want to have minimal requirements on the server that aren't "copy this directory here". Thanks!

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• C - check if string is a substring of another string

  - by user69514

  I need to write a program that takes two strings as arguments and check if the second one is a substring of the first one. I need to do it without using any special library functions. I created this implementation, but I think it's always returning true as long as there is one letter that's the same in both strings. Can you help me out here. I'm not sure what I am doing wrong: #include <stdio.h> #include <string.h> int my_strstr( char const *s, char const *sub ) { char const *ret = sub; int r = 0; while ( ret = strchr( ret, *sub ) ) { if ( strcmp( ++ret, sub+1 ) == 0 ){ r = 1; } else{ r = 0; } } return r; } int main(int argc, char **argv){ if (argc != 3) { printf ("Usage: check <string one> <string two>\n"); } int result = my_strstr(argv[1], argv[2]); if(result == 1){ printf("%s is a substring of %s\n", argv[2], argv[1]); } else{ printf("%s is not a substring of %s\n", argv[2], argv[1]); } return 0; }

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• StackOverflow in VB.NET SQLite query

  - by Majgel

  I have an StackOverflowException in one of my DB functions that I don't know how to deal with. I have a SQLite database with one table "tblEmployees" that holds records for each employees (several thousand posts) and usually this function runs without any problem. But sometimes after the the function is called a thousand times it breaks with an StackOverflowException at the line "ReturnTable.Load(reader)" with the message: An unhandled exception of type 'System.StackOverflowException' occurred in System.Data.SQLite.dll If I restart the application it has no problem to continue with the exact same post it last crashed on. I can also make the exactly same DB-call from SQLite Admin at the crash time without no problems. Here is the code: Public Function GetNextEmployeeInQueue() As String Dim NextEmployeeInQueue As String = Nothing Dim query As [String] = "SELECT FirstName FROM tblEmployees WHERE Checked=0 LIMIT 1;" Try Dim ReturnTable As New DataTable() Dim mycommand As New SQLiteCommand(cnn) mycommand.CommandText = query Dim reader As SQLiteDataReader = mycommand.ExecuteReader() ReturnTable.Load(reader) reader.Close() If ReturnTable.Rows.Count > 0 Then NextEmployeeInQueue = ReturnTable.Rows(0)("FirstName").ToString() Else MsgBox("No more employees found in queue") End If Catch fail As Exception MessageBox.Show("Error: " & fail.Message.ToString()) End Try If NextEmployeeInQueue IsNot Nothing Then Return NextEmployeeInQueue Else Return "No more records in queue" End If End Function When crashes, the reader has "Property evaluation failed." in all values. I assume there is some problem with allocated memory that isn't released correctly, but can't figure out what object it's all about. The DB-connection opens when the DB-class object is created and closes on main form Dispose. Should I maybe dispose the mycommand object every time in a finally block? But wouldn't that result in a closed DB-connection?

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• RadTabControl and MVVM

  - by Jeff

  First, so you know, Silverlight 4 and VS 2010 both RC and RIA services. I'm also new to Silverlight... I have a page that has a Telerik RadTabControl on it. It will always have six tabs, i.e. the number of tabs is not data driven. The tabs are used for various admin functions. One tab for managing users with a grid and edit view, another that will have basic company info - just a few text boxes on it. The other tabs are similar to these two. I'm trying to use MVVM and can't decide on the best approach. I don't think I want one big ViewModel that handles all six tabs - that would be big, ugly and harder to maintain. Any recommendations for approaches on how to break this out? Perhaps have a ViewModel for each tab? If so, how would I (generally) go about implementing something like that? Or is there another approach that makes more sense? Thanks, Jeff

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• Mac gcc non-virtual thunk error

  - by fret

  I'm getting these non-virtual thunk errors only in the Deployment build of my app. It uses a private framework called Lgi. Building on 10.5.8 using XCode 3.1.4 (latest for leopard?) The error looks like this: Ld /Users/matthew/Code/Scribe-Branches/v2.00/build/Development/Scribe.app/Contents/MacOS/Scribe normal i386 cd /Users/matthew/Code/Scribe-Branches/v2.00 /Developer/usr/bin/g++-4.0 -arch i386 -L/Users/matthew/Code/Scribe-Branches/v2.00/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/build/Development -F/Users/matthew/Code/Lgi/build -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment -filelist /Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Development/Scribe.build/Objects-normal/i386/Scribe.LinkFileList -framework Carbon -framework Lgi -o /Users/matthew/Code/Scribe-Branches/v2.00/build/Development/Scribe.app/Contents/MacOS/Scribe Undefined symbols: "non-virtual thunk to GWindow::OnDrop(char*, GVariant*, GdcPt2, int)", referenced from: vtable for ScribeWndin ScribeApp.o vtable for GShutdownin ScribeApp.o vtable for CalendarUiin Calendar.o vtable for CalendarViewWndin CalendarView.o vtable for CalendarConfigin CalendarView.o vtable for ScribeExportin Exp_Scribe.o vtable for GNewMailDlgin GNewMailDlg.o ....etc for lots of classes.... Anyway I know I'm not leaving those undefined because it does in fact link and run fine in the development build. Now after googling the issue the first thing to try is changing the optimization setting, which I did... and no dice. Some link error. So these virtual functions are initially defined in GDragDropTarget, and GWindow's inheritance looks like this: class LgiClass GWindow : public GView #ifndef WIN32 , public GDragDropTarget #endif (LgiClass being for __declspec export/import on win32) Any ideas on what to try next? Maybe I need to provide more info.

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• Strings in array are no longer strings after jQuery.each()

  - by Álvaro G. Vicario

  I'm pretty confused with the behaviour of arrays of strings when I loop them through the jQuery.each() method. Apparently, the strings become jQuery objects inside the callback function. However, I cannot use the this.get() method to obtain the original string; doing so triggers a this.get is not a function error message. I suppose the reason is that it's not a DOM node. I can do $(this).get() but it makes my string become an array (from "foo" to ["f", "o", "o"]). How can I cast it back to string? I need to get a variable of String type because I pass it to other functions that compare the values among them. I enclose a self-contained test case (requires Firebug's console): <!DOCTYPE html> <html> <head><title></title> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript"><!-- $(function(){ var foo = []; var $foo = $(foo); foo.push("987"); $foo.push("987"); foo.push("654"); $foo.push("654"); $.each(foo, function(i){ console.log("foo[%d]: object=%o; value=%s; string=%o", i, this, this, $(this).get()); // this.get() does not exist }); $foo.each(function(i){ console.log("$foo[%d]: object=%o; value=%s; string=%o", i, this, this, $(this).get()); // this.get() does not exist }); }); //--></script> </head> <body> </body> </html>

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• Redrawing rounded corners when using curvycorners-plugin for jQuery.

  - by timkl

  I'm using the curvycorners jQuery plugin (http://www.curvycorners.net/instructions/) to force IE to render rounded corners on divs. It works really well, apart from one thing: I have a validation error-message that pops up inside the div, using jQuery's "show" method. Curvycorners adds an extra div that is absolute positioned and has a set height, this means that you have to redraw the rounded corners if you want the containing div to resize when the error-message is shown. Curvycorners include a functions you can call to redraw the rounded corners, however it doesn't execute when I put it inside this click-function: $("input[type='submit']").click(function(e) { curvyCorners.redraw(); }); This is my markup: <fieldset class="curvyRedraw"> <legend>Some legend</legend> <form id="someForm"> <div id="error-message"></div> <div class="buttons"> <input type="submit" id="cancel" value="Cancel" name="action" /> <input type="submit" id="submit" value="Confirm" name="action" /> </div> </form> </fieldset> Anyone had similar issues?

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