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• Validation of dependent properties in a "live edit" WPF app

  - by Ryan Cromwell

  I'm working on an app which supports live editing. That is you update properties in one area and their impact is seen in another with hitting "apply". Happens to be a charting app. One such edit "group" allows specifying a range. A triple range in fact: High, Target and Low. Our validation is such that High must be greater than target, target must be greater than Low (rocket science). Our dilemma is that the visual experience is a bit jarring when someone wants to go from say 30,20,10 to 15,10,5. I'm curious if anyone has implemented a mechanism for this scenario that might fit well in our situation such that we don't "yell" at the user as they change the range values.

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• Is it possible to access raw iphone audio output?

  - by Peter Hall

  Is it possible access raw PCM data from the iphone audio output? I know I can embed an MP3 and use AudioUnit. But if the user is playing music in the background from their itunes library, is it possible to access that audio data? This is for an app that shows visual effects, which react to the music. From what I can tell, it isn't possible, but that's just from lack of finding any information at all, rather than actual confirmation that it can't be done. If it isn't possible to access the audio stream from the ipod, is it possible to access raw audio output from the Media Player inside an app, or is pretty much not permitted to access raw audio data from the itunes library at all? EDIT: I found this question: iOS - Access output audio from background program, which say I can't access the audio from a background app. But is it possible to get the audio data from the itunes library if I play it inside the app?

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• VB.NET: Force user to use the topmost form

  - by SiliconCelery

  I'm programming a Minesweeper clone in Visual Studio 2010, with VB.NET, as a Windows Form Application, and I'm having trouble with the Game Won and Game Lost forms. When I show those forms, I want the game form to still be visible, so that the player can see where the mines were, but I don't want the game form to be enabled until the Game Won or Game Lost form is closed. Exactly like Windows Minesweeper does when you win or lose. There aren't any obvious properties for this, as far as I can see, and I've had no luck Googling, I don't know what terms to search. Any help is appreciated, thanks.

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• Printing from a Windows Service

  - by Andre

  Ok, I am trying to print a page from a windows service that I installed using a Visual Studio setup project. At first I set the Account property yo Local System, but it will tell me that there are no printers installed (and there are). So I changed it to user and now it just doesn't print (no error or anything). I did some Googleing and basically it said that "Interact with Desktop" should be enabled. To programatically do this you need to edit the registry settings for this service (which really is second prize). I tried to manually set it on the properties dialog under Services, but then I need to change the Account back to Local System, which brings me back to the "No Printers Installed" problem. Any ideas?

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• Explicit initialization of struct/class members

  - by Zephon

  struct some_struct{ int a; }; some_struct n = {}; n.a will be 0 after this; I know this braces form of initialization is inherited from C and is supported for compatibility with C programs, but this only compiles with C++, not with the C compiler. I'm using Visual C++ 2005. In C this type of initialization struct some_struct n = {0}; is correct and will zero-initialize all members of a structure. Is the empty pair of braces form of initialization standard? I first saw this form of initialization in a WinAPI tutorial from msdn.

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• Date Input in safari

  - by Fresheyeball

  So I am using the HTML5 date input type, primary to trigger the 'wheels' in iOS. Everything is working fine in ie7-9 Chrome and FF. But Safari for OSX is very upset. It sees the need to add little 'up and down' buttons to the right hand side and generally mess up my visual stylings. My attempt to fix this, is to change the date inputs back to text inputs for desktop browsers, and leave it as date inputs for mobile: unless device.is # 'device' is a lib I use to detect mobile browsers dateFields = $ 'input[type="date"]' dateFields.attr 'type', 'text' #this fails dateFields.datepicker() dateFields.on 'keyup', (e) -> e.preventDefault() $(@).val '' Beyond altering the input type with js, I am at a loss for how to fix this little bugger. Have you had to deal with this problem?

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• Modifying reference member from const member function in C++

  - by Philipp

  I am working on const-correctness of my code and just wondered why this code compiles: class X { int x; int& y; public: X(int& _y):y(_y) { } void f(int& newY) const { //x = 3; would not work, that's fine y = newY; //does compile. Why? } }; int main(int argc, char **argv) { int i1=0, i2=0; X myX(i1); myX.f(i2); ... } As far as I understand, f() is changing the object myX, although it says to be const. How can I ensure my compiler complains when I do assign to y? (Visual C++ 2008) Thank a lot!

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• Document key usage in Dictionary

  - by phq

  How can I document the key usage in a Dictionary so that it shows in Visual studio when coding using that object? I'm looking for something like: /// <param name="SpecialName">That Special Name</param> public Dictionary<string,string> bar; So far the best attempt has been to write my own class: public class SpecialNameDictionary : IDictionary<string, string> { private Dictionary<string, string> data = new Dictionary<string, string>(); /// <param name="specialName">That Special Name</param> public string this[string specialName] { get { return data[specialName]; } } } But It adds a lot of code that doesn't do anything. Additionally I must retype every Dictionary method to make it compile. Is there a better way to achive the above?

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• Does .NET have a linker?

  - by Water Cooler v2

  From Jon Skeet's blog: What does the following comment mean? // The line below only works when linked rather than // referenced, as otherwise you need a cast. // The compiler treats it as if it both takes and // returns a dynamic value. string value = com.MakeMeDynamic(10); I understand what referencing an assembly is. You may reference it when compiling the program files either using the /ref: switch at the command line or you may add a statically reference to the assembly in Visual Studio. But how do you link to an assembly in .NET? Does he mean, load the assembly using Reflection (Assembly.LoadFile())? Or, the Win32 API LoadLibrary()? Or, does .NET have a linker that I have never heard of?

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• How to initialise a STL vector/list with a class without invoking the copy constructor

  - by Warpspace

  I have a C++ program that uses a std::list containing instances of a class. If I call e.g. myList.push_back(MyClass(variable)); it goes through the process of creating a temporary variable, and then immediately copies it to the vector, and afterwards deletes the temporary variable. This is not nearly as efficient as I want, and sucks when you need a deep copy. I would love to have the constructor of my class new something and not have to implement a copy constructor just to allocate my memory for the second time and waste runtime. I'd also rather not have to immediately find the class instance from the vector/list and then manually allocate the memory (or do something horrible like allocate the memory in the copy constructor itself). Is there any way around this (I'm not using Visual Studio BTW)?

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• What's currently the best way to extend Excel using C#?

  - by user169867

  I have the professional versions of VS2008 & VS2010. I wish to add a couple buttons to a toolbar in Excel. When they are clicked I'd like to be able to open a form (either WinForms or WPF is fine) collect a few values from the user in the form and then take that data + read cell values from the current worksheet to perform some database operations. What's currently the best way to do this using C#? I'd greatly appreciate a pointer to any examples / tutorials. My understanding is that VS2010 has improved the process alot but I may have to deal w/ Excel 2003 which I don't think it supports. I get confused between Visual Studio 2008s Extensibility-Shared Addin template and other Office Addin templates I've seen. I'm not sure when which type of solution is appropriate. I'm new to Office development so I'd really appreciate any help to get me going on the right track. Thanks much.

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• NavigateBackward in Vim?

  - by vexe

  So Ctrl-o works only with jumps and has a history, '' gets you back to your last position regardless of how you ended up there (jumping, navigating, etc) but there's no history for it. What I'm looking for is the best of those two worlds, something like Visual studio's NavigateBackward. Ctrl-o is good but a lot of the times it takes me back to positions I wouldn't expect, jumping is not the only way I navigate... Is there a built-in command/way in vim that does this? if not, is there a plugin for it? if not, I have no problem writing a plugin myself, I know how to set/get the caret position, but I looked at the autocmd-events and couldn't find anything that fires when the caret changes position. How would I go about detecting the 'change' of the caret position? Thanks.

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• EllipseGeometry is not rendering in Silverlight

  - by Mark Nelson

  I'm trying to draw a circle in WP7 Silverlight using EllipseGeometry instead of Ellipse. The sample XAML in MSDN does not display anything on the canvas in Visual Studio. If I run the app, it does display in the emulator. <Canvas> <Path Fill="Gold" Stroke="Black" StrokeThickness="1"> <Path.Data> <EllipseGeometry Center="50,50" RadiusX="50" RadiusY="50" /> </Path.Data> </Path> </Canvas> Any ideas what is happening?

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• How to make SVN ignore a folder?

  - by pg

  I want to make SVN ignore everything that is in my wordpress directory. It bring me nothing but headaches because of auto updates to plugins etc. When I... svn propedit svn:ignore ./blog It tells me... svn: None of the environment variables SVN_EDITOR, VISUAL or EDITOR is set, and no 'editor-cmd' run-time configuration option was found So I... [phil@sessions www]$ export SVN_EDITOR=emacs [phil@sessions www]$ svn propedit svn:ignore ./blog But I don't know what to put in here to make it ignore.

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• Managing Large Database Entity Models

  - by ChiliYago

  I would like hear how other's are effectively (or not) working with the Visual Studio Entity Designer when many database tables exists. It seems to me that navigating the Designer is tough enough to find what you are looking for with just a few tables but how about a database with say 100 to 200 tables? When a table change is made at the database level how is the model updated? Does it overwrite any manual changes you have made to the model? How would you quickly find an entity in the designer to make a change or inspect a change? Seems unrealistic to be scrolling around looking for specific entity. Thanks for your feedback!

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• System.Data.DataException thrown when launching application after install

  - by jwarzech

  I currently have a (Visual Studio 2008) installer that has a 'Primary output...' custom action under 'Install' with 'InstallerClass' set to false. During the install I get a System.Data.DataException. When I run the debugger I am getting an exception being thrown from a bit of database access code that runs when the application starts. The database access is using Windows Authentication and works correctly when the application is started manually. Is this something to do with permission settings not allowing db access when launched from the installer? (I'm out of ideas)

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• Why won't the debugger update?

  - by Tanner

  Hello everyone, Ive had this problem multiple times and it ruins my projects, I make some changes, like say I have a button in the top left corner of the form and move it to the top right corner, then I press debug but nothing happens to the form, it doesn't change the button is still in the top left-hand corner instead of the top right, and it also doesn't except any new code, its like it saved the project right there and won't move on. Does any one know why or had this problem before? Please, Help!!!! Additional Details: Compiler: Microsoft Visual C# 2008 Express Edition I once fixed this problem by rebuilding the solution, but its never worked again.

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• Install windows service without InstallUtil.exe

  - by annelie

  Hi, I'm trying to deploy a windows service but not quite sure how to do it right. I built it as a console app to start with, I've now turned it into a windows service project and just call my class from the OnStart method in the service. I now need to install this on a server which doesn't have Visual Studio on it, which if I've understood it correctly means I can't use the InstallUtil.exe and have to create an installer class instead. Is this correct? I did have a look at a previous question, http://stackoverflow.com/questions/255056/install-a-net-windows-service-without-installutil-exe, but I just want to make sure I've understood it correctly. If I create the class that question's accepted answer links to, what is the next step? Upload MyService.exe and MyService.exe.config to the server, double click the exe file and Bob's my uncle? The service will only ever be installed on one server. Thanks, Annelie

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• No parameterless constructor defined for this object when simply copying site

  - by jaffa

  I'm getting the above error. All I have done is copied an existing site and set-up debugging to use a different port using IISExpress in Visual Studio. Any ideas why I would suddenly get this error? Normally I get this error when StructureMap cannot for some reason resolve a dependency to inject into a controller. But this has me stumped. The code-base is the same. All I've done is copied the code into another folder!?!

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• How to correctly load 32-bit DLL dependencies when running a program from a batch file

  - by neilwhitaker1

  I have written a tool that references Microsoft.TeamFoundation.VersionControl.Client.dll, which is a 32-bit DLL. When I build my tool on 64-bit Windows, I set Visual Studio to specifically target X86 in order to force it to a 32-bit build. Targetting X86 instead of All-CPU's prevents me from getting a BadImageFormatException, as long as I invoke the tool directly (e.g. by typing "myTool.exe" on the command line). However, if I run a batch file that invokes the tool, I still get the exception. This happens even if the batch file runs in a 32-bit command prompt (%WINDIR%\SysWOW64\cmd.exe). What else can I do to make this work?

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• I'm having a problem identifying a floating point exception.

  - by Peter Stewart

  I'm using c++ in visual studio express to generate random expression trees for use in a genetic algorithm type of program. Because they are random, the trees often generate (I'll call them exceptions, I'm not sure what they are) Thanks to a suggestion by George, I turned the mask _MCW_EM on so that hardware interrupts are turned off. (the default) So, the program runs uninterrupted, but some of the values returned are: -1.#INF, -1.#NAN, -1.#INV. I don't know how to identify these so that I can throw an exeption: if ( variable == -1.#INF) ?? DigitalRoss in this post seemed to have the solution, but as I understood it I couldn't make it work. I've been looking all over the place for this simple bit of code, that I assumed would be used all the time, but have had no luck. thanks

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• ASP.Net: HTTP 400 Bad Request error when trying to process http://localhost:5957/http://yahoo.com

  - by mat3

  I'm trying to create something similar to the diggbar : http://digg.com/http://cnn.com I'm using Visual Studio 2010 and Asp Development server. However, I can't get the ASP dev server to handle the request because it contains "http:" in the path. I've tried to create an HTTPModule to rewrite the URL in the BeginRequest , but the event handler doesn't get called when the url is http://localhost:5957/http://yahoo.com. The event handler does get called if the url is http://localhost:5957/http/yahoo.com To summarize http://localhost:5957/http/yahoo.com works http://localhost:5957/http//yahoo.com does not work http://localhost:5957/http://yahoo.com does not work http://localhost:5957/http:/yahoo.com does not work Any ideas?

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• Building a dll with .lib files

  - by Manish Shukla

  I have a C++ project which is build via bjam. With 'install' rule in Jamroot i am able to create statically linked libraries (.lib files) for my project. My question is, how i can build a load-time DLL (or run-time DLL is also fine) with these .lib files? More Info: I am building my project with bjam in windows using msvc. When i tried compiling my project under visual C++ 2008, it complied and linked just fine but when i used bjam with msvc for compilation, it started giving linking errors and showing dependency from other project folders. Why was this behavior via bjam but not shown in vc++ UI.

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• Grab triangles within a lower triangle

  - by Tyler Rinker

  I have the need to grab all the thee element triangles that make up the lower triangle of a symmetric matrix. I can not think of how to grab all these pieces in the order of far left column working down and then next column to the right and so on. I know that the numbe rof mini triangles inside of the lower triangle is: n = x(x - 1)/2 where: x = nrow(mats[[i]]) Here I've created three matrices with letters (it's easier for me to conceptualize this way) and the elements in the order I'm looking for: FUN <- function(n) { matrix(LETTERS[1:(n*n)], n) } mats <- lapply(3:5, FUN) So this is the output I'd like to get (I put it in code rather than output format) for each of the matrices created above: list(c("B", "C", "F")) list(c("B", "C", "G"), c("C", "D", "H"), c("G", "H", "L")) list(c("B", "C", "H"), c("C", "D", "I"), c("D", "E", "J"), c("H", "I", "N"), c("I", "J", "O"), c("N", "O", "T")) How can I do this task in the fastest manner possible while staying in base R? Not sure if this visual of what I'm after is helpful but it may be:

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• System.Windows.Forms.DataGridView does not display data

  - by Water Cooler v2

  All I am doing is a simple: // Both the methods, order.GetAllOrderItems() and order.GetOrderedItemsWhereBrandIs("foo") // return an IEnumerable<T> so the assignment to the DataSource property of the DataGridView // should be fine. The problem is in re-assigning the data source property. public void DisplayItems() { // The data appears if I have just this line. dgvOrderedItems.DataSource = order.GetAllOrderItems(); dgvOrderedItems.DataSource = null; // This time the data grid does not take the new data source. Instead, because // of the null assignment in the previous statement, it displays no data at all. dgvOrderedItems.DataSource = order.GetOrderedItemsWhereBrandIs("Lenovo"); } My question is: is there a way to change the data source of a DataGridView control once it has been set? I am using C# 4.0 and Visual Studio 2010 for development.

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