(c++) I have to present a wave which is stored in a file (int numbers, I know sample's freq) on some kind of graph. I've never been using drawing in c++. Any suggestions, the easiest way to do that? thanx... ...more >>

Hi, I'm a total C++ neophyte, and we've got a short deadline to turn around. Essentially, I need a utility that installs a series of fonts on a given system, and I don't know whether the .NET runtime is installed on that system, so I want something that will run w/o the .NET runtime, VB dll...more >>

What is the best way to record from a microphone or line in in a unmanaged C++ program? I found a C# sample using DirectSound but we prefer an unmanaged C++ version with no need of .NET. Many thanks Olaf ...more >>

.....it's nothing but .NET... : ) [==P==] ...more >>

Hi, I used to have the following: class CArchive { public: // create and specify the filename to use CArchive(CString filename, DWORD size); virtual ~CArchive(); CArchive& operator<<(bool b); CArchive& operator<<(BYTE by); CArchive& operator<<(WORD w); CArchive& operator<<(LONG l...more >>

Hi All, I want to repeat the mouse behavior from user. I have an application ( Bluetooth ), I can drag files (Mp3/jpg/...) to the bluetooth icon, and then choice the target device, finally, the applicatoin will send those files to the target device. Right now, I want this behav...more >>

Hi, Is it possible to add a VC++ 6 library ot a VC++ 8 application ? if yes how ? is it possible to link a DLL ? how ? -- Dani ...more >>

Hello All, I am looking for VC++ implementation of travelling salesman problem. My project designer wants it not to have with branch and bound algorithm or any genetic/nural algorithm. Any pointers? Thanks, Po ...more >>

I'm testing AutoCAD 2005 automation via VS2005 Pro C++/CLR and I'm getting fatal compiler errors. I start with a default C++/CLR class library project and modify it by adding the following references: acdbmgd.dll acmgd.dll the entire source for the default library header file ...more >>

How does one launch multiple forms in an application? Using Photoshop as an example, this application seems to be composed of many 'disjoint' forms. Yet, they all seem somewhat 'active' in contrast to one of them always being 'modal' (e.g., if you are moving over a picture the 'Info' form w...more >>

I am currently converting a large solution from vs2k3 to vs2k5. The conversion went smoothly, however I am getting a lot of warning about duplicate imports of items in my Managed C++ projects. I removed all the references and re-added them (they are to other projects in the solution), but I ...more >>

Except for legacy or non-.NET applications, is there any reason to use VC++ anymore? It seems that for .NET applications, there would be no reason to choose C++ over C# since C# is faster to develop with (i.e. no header files, objects are easier to create and use, C# language is native to .NET...more >>

I am using MS Visual studio 2003 C++ I am tring to program my first service and am having many questions and issues. 1) Is there any documentation/ book that has good examples with details on how decsions where made in selecting various service options. 2)I would like to create a log file,...more >>

Sometimes it's hard to get straight when passing or storing or returning an instance of a class whether you are still dealing with the original object or a copy. For example, the '=' operator used on pointers to two instance of a class can be overloaded to return the pointer to the target inst...more >>

I'm about to write a network aware application. Of course I intend to do UDP broadcasting to detect other app on my network. But I would like my application to be usable over the internet as well. Between to end user computer. Ideally if user could connect through MSN identity that would be p...more >>

I have implemented an international text editor based on uniscribe, GDI & GDI+. While it display internationalized text fine I realize user input are no good. So far what I do: I override Control.OnKeyPressed(char keyCode); I was expecting the appropriate char to be passed on. Now I test...more >>

I've upgraded my code to VS C++.NET 2005 (Express) using /clr pure. My question is, why is there an exception to the rule in how pointer syntax is done in the event handlers? For example, why is this proper syntax: button->Click += gcnew EventHandler( this, &MyClass::MouseHandler ) ; Th...more >>

Hi there, I need to do the following: 1. Migrate a whole solution (with tens of projects) from VC 6.0 to VC 8.0. The project has a lot of MFC templates like CArray, and many error are poping out, like: Error 1 error C2248: 'CObject::operator =' : cannot access private member declared in class '...more >>

After including sstream the compiler reports hundreds of errors. They are all caused by a missing ios_base definition. When I search for ios_base in the installation directory of VS.NET 2003 I find only seven files with the ..cpp ending. So where is ios_base defined?! Boris ...more >>

I have an iherited child class in which I would like to have a variable which uses the base(parent) class. Something like this: class Child : public Base { public: Child () : Base() { } private: MyClass *var1; MyClass has a Base class variable and also uses the...more >>

hi, i created a paint program for my c++ class using a global GraphicsPath variable. i the, in the onpaint method, draw the line the users draws with the mouse. simple. the only problem is that when i invalidate the panel im drawing on in order to see the line, it flickers, even with double bu...more >>

When the application I'm working on is run it creates a panel with a Paint event customized to draw primitives (circles, rectangles, etc.), places the panel on a form, and then launches the form. The weird part is, the panel, in the instant it becomes visible, seems to have an image of wha...more >>

I could not get the following code to compile: public ref class wrapper { void Read(int^ mpLen) { pin_ptr<int> pLen = mpLen; unmanaged* punman = new unmanaged(); punman->Read(pLen); return; } } The error was in the conversion from a managed poin...more >>

it's only 2 hours I'm using it and I'm already mad from it's unproductivity feature. - my most hated feature being: you can't save your file (because it's used by VC# express). Very typicall after a failed build there are minor ones as well kind of, such as: - take 20 seconds to save a f...more >>

Greetings, Am trying to change the font of a CTabCtrl I have in my Main Frame Window (not a Dialog Box). Since CTabCtrl is based in CWnd, I figured that SetFont() should work. No luck. And there are no CTabCtrl member functions specifically for changing the font. My code looks l...more >>

After converting from 6.0 to 2005 when I try to Compile my project I'm getting a LINK error Error 1 fatal error LNK1181: cannot open input file " ?/.obj" Any ideas how to fx this please ? -- Michael Tissington http://www.oaklodge.com http://www.tabtag.com ...more >>

I have an MFC Extension DLL that I have flicked the /clr switch on and made a few other tweaks so it compiles and runs in a managed MFC applicaiton. The DLL contains a number of classes which contain static member variables and static methods. Are these permitted in a managed DLL? Thanks ...more >>

Hi, I'm trying to add an object to a checked listbox using VC++2005 Express. I tries adding a managed String (String ^) and objects that implement their own version of the ToString() method. I always get the same error message: "object reference not set to an instance of an object". The ob...more >>

I have written a Service in C++ (VC8) derived from System::ServiceProcess::ServiceBase. In the OnStart() method I detect a service failure but the SCM reports that the service started successfully. How can I tell the SCM that the service failed? I tried with SetServiceStatus(SERVICE_STOP...more >>

Someone had suggested from an unmanaged application i can use SCL streams to save data and read this same data into a managed application using .NET FX. Can you tell me what SCL streams are exactly? And what exactly is .NET FX? Is this just a general term for the framework classes? Th...more >>

I can find source code in output.c for all the format specifications except for the workings of %e, %f and %g (and also %E and %G). Where is the source code for these functions? If it is not included, does anyone know why not?...more >>

Trying to save/load a class instance to a file is tough. The reason is because there is no way to preserve its type other than by conventon. For eample, one can save all the states of the members of a class instance to a file. But when loading it up the program can only read in the values stor...more >>

Hi all, If i compile my VC 6.0 code with the VC.NET 2003 compiler (unmanaged C++), then can the compiled executable be run on a machine without the ..NET architecture? Thanks! ...more >>

I have an MFC based application which uses remoting using VS05. On exiting the application, I intermittently get a crash at line 195 in dllmodul.cpp (AFX_MANAGE_STATE(&afxModuleState);) The exception I see in the IDE is "Unhandled exception at 0x7c81eb33 in MgmtApp.exe: 0xC0020001: The stri...more >>

I have a 3rd party unmanged .dll. This has functions that will look up information and fill a C string passed to it with data. I want to use this data in .NET classes after it has been filled and I am programming in C++. I believe that I should use pinvoke, but I see a problem that I can't f...more >>

Can anybody shed some light... Confused here :(( Isn't VS.2005 supposed to use the new build system, that can be invoked separately from the IDE? If yes, why it creates vcproj files? Are these files compatible with msbuild? Or, can they be exported to the build? Regards, --PA ...more >>

Hello, What is the easiest way to interface, from MFC, and Access 2000 database? Eitan...more >>

I don't manage to use the instance number meta-character brace in ATL regular expressions. For instance : \d{5} meaning 5 digits fails with '01234' or a{3} meaning i want three 'a' fails with 'aaa' I cannot believe that we cannot make it with this ATL routine, that's so basic I must...more >>

This is a follow on from my previous thread about clr/safe and STL.NET http://groups.google.com/group/microsoft.public.dotnet.languages.vc/browse_thread/thread/0eb9b25a83bc02df/b170a89dbc67c332#b170a89dbc67c332 A more specific problem now is migrating the current MFC serialization onto STL se...more >>

I have a Visual C++ Project (a C++ dynamic DLL) in Visual Studio 2003 NET. I want to use for example the _beginthreadex() function, but I cannot compile my code. The compiler breaks up with the message : '_beginthreadex': identifier not found, even with argument dependent lookup I added the...more >>

Hello everyone, I'm trying to implement an interface. I import the reference of the COM library and I set up my class like namespace testing { public __gc class Class1 : public IMeedioPlugin now, in C# after I finish typing IMeedioPlugin it say something along the lines of pr...more >>

Hello, I having having oodles of trouble using the std lib in my MC++ (VS.NET 2003) Class library. I figured out a simple sample to reproduce the errors I am having. Create a MC++ (VS.NET 2003) class library and type in the following code below: #include <map> #include<string> using std...more >>

I have a C++ Console application being written using VS C++.NET 2005 Express. It never crashes and seems to be working just fine. However, when I close the application via the Console 'X' exit button in upper right corner of its dialog box I get the following exit code: "The program '[1576...more >>

Hello, Im using MC++ VS.NET 2003 and am quite confused with with gcroot template and its use. The issue I am confused about is the need to (or not) delete a pointer to a managed object that you have created using gcroot. For example(from Managed VC++ 2003 Step by Step by Microsoft Press p510)...more >>

Hi there, Got a quick question, I have an app that I'm compiling with /clr and I have a native function that passes in a pointer, and I need to copy from that unmanaged memory into a managed Byte array but I can't quite figure out how to properly cast everything, here's what I have right n...more >>

Hi, How can I split Double into two integers like the following example : 2.34 -> 2 and 34 (I dont want the modf() result that gives 2 and 0.34) Hugo...more >>

We have been trying to upgrade all our C++ projects from VC6 to VS .Net2003 for a while (before VS 2005 arrived), and seem to be stuck now because of the performance degradation seen for the same code when compiled by the new compiler compared to being compiled by VC 6 compiler. Originally w...more >>

Hello, there is a bug in the compiler of Visual C++ 2005/14.00.50727.42 (also 13.10.3077). This code compiles but must not compile: #include <string> namespace n { using namespace std; template<class T> struct s{}; } void f() { string str; } When commenting o...more >>

I have a COM component that performs logging in a managed MFC application. The main body of the application is built using /clr, as are all of the MFC and regular DLL's. The COM componet is not built using /clr. When I make a call into the COM object from a "normal" C++ class (compiled with...more >>

Re VS2005 editor in Emacs mode (options->env->keyboard mapping) First of all, there are very few editor options for formatting C/C++ code. Only three option pages. C# has about 10, I believe. Why are there no C++ equivalents to C#'s detailed formatting options? In the following code block,...more >>