Hi, (all unmanaged c++) I have a char *. I allocate it using: char * t = new char [ any_size_here]; at some point I want its length to grow to accomodate copying more characters. What is the best way of doing it? Also, can I just use std:string instead, and is its string appending very ...more >>

I've got a solution that has a C++ project that compiles to a DLL, and a C# project that is the main piece of the program. The DLL is managed C++ on top of regular C++. In one of the native functions, I make a call that looks a little like this: file = _fsopen(path, mode, SH_DENYNO); T...more >>

.... a few things about what I feel would help make me more productive in my environment. I think that others could benefit too. Is there an email or place where I can post my ideas directly? Back in the day there were programs that allowed you to enter items for consideration and you got a...more >>

Hi, I am writing some unmanaged c++ code that would need to be compiled in the future using compilers other than vc++. I'm using the feature of vc++ "use precompiled headers", is there going to be any problem if I compile this code on other compilers? I'm asking this because when I use pch *so...more >>

Hello, I'm using Managed C++ in .NET 2003. I'm trying to map integers to Enums inside an STL map container, but I cannot get it to compile. This might be a simple question, and I'm sure I'm missing something, but I haven't used STL a lot inside MC++. Here's my code: #include <map> #i...more >>

Is it possible, in Managed C++, to name/access visual controls an indexed way like VB 6.0 Thanks, Hugo...more >>

Hi, when compiling with debug information, I get an error: fatal error C1067: compiler limit : debug information module size exceeded The error is caused by a very large enum (about 2000 elements) which comes from a referenced component. Is there any workaround to make a debug build and k...more >>

the class: public __gc class Vector { private: Double y, x, z; public: Vector() { y(0), x(0), z(0) { } }; Vektor(Double y, Double x, Double z){ y = x1; x = x2; z = x3; } Vector(String __gc* strVector); // "123.23,1232.23,4235345." __property Double get_Y(); __property vo...more >>

Hi, I'm trying to "port" a project from VC++ 2003 to VC++ 2005 (Express Edition). This project contains the following code on several places (It is not exactly this code but a generalization of what it does.): vector<int> int_vector; vector<int>::iterator i, j; for (i = int_vector.begi...more >>

After porting a project from VC6 to VC.NET 2003 I have a very strange problem generating link error 1104 for import libraries. I just ported the project and made some small adaptions so it fits the new IDE. The project itself links against some import libraries belonging to dll's I wrote (thes...more >>

I receive this error message. unable to display folder, error has been detected in the file C:/_______________, quit all mail applications and then use the inbox repair tool. How do I use this tool? -- pk...more >>

I'm writing an ISAPI DLL [unmanage code] that calls into managed C++ code (same DLL). I'm receiving the following link errors: EditResponse.obj : error LNK2001: unresolved external symbol "int __cdecl stricmp(char const *,char const *)" (?stricmp@@$$J0YAHPBD0@Z) EditResponse.obj : error LNK2...more >>

I'm interested in learning C++. I'm not sure exactly what this means. I'm currently a VB.NET/C#.NET programmer (both Windows Forms and ASP.NET). I am totally clueless when it comes to C++. I've tried creating new projects and even that is confusing. I'm unsure of the differences between M...more >>

I am using GDI+ to load a tiff image and write a string to it and save the tiff image to another file. I can save the image with only LZW Compression and not abel to save with CCITT4 compression. If I use CCITT4 compression I get an invalid paramter error when saving file. The file saved...more >>

Hi, Is there any way to make #import use wchar_t as a Built-In type? I have a .idl file that has some wchar_t parameters when run through MIDL it produces a header file that also references wchar_t parameters, but whenever I use #import on the DLL, which was generated in the DLL project ...more >>

I m trying to create a C++ managed class to use it in C#. I m new to MC++ and interoperability and I try to find a bug since a long time without succes, maybe you can help me ? (I have a sample project if you want to debug it, you can contact me at cdemez2@hotmail.com too) I describe the...more >>

Hi Guys, With the help of Karl Petterson, we've moved tonight the old MVP VC++ FAQ (http://www.mvps.org/vcfaq/) over to the new MVPS.ORG server. The new address is http://vcfaq.mvps.org/ but redirects are in place so existing links will keep working, so no need to worry about that. That ...more >>

What is the difference between Visual Studio 2005 Team Edition and = Professional Edition? Programming wise, there is no difference, right? Thanks. Wanjun...more >>

Does Visual Studio 2005 work with Source Safe 6.0? Thanks. Wanjun ...more >>

I am using instances of DateTime within my application and i need their values to be used as selection criteria in an SQL select clause. So i need them to return a literal string representation of themselves in the following format '{ts '1990-01-01 00:00:00'}' Where the date can be any v...more >>

Hi, I did spend quite a long time finding how to call managed code from unmanaged C++ class. Here is the my final code: http://xtware.com/mcallback/mcallback.htm Is it the best way to do it? Does mgt^ callback = (mgt^)GCHandle::FromIntPtr(IntPtr(m_callback)).Target; take long time to ex...more >>

In visual studio 2005 I have built a simple win32 console programm.the code as follows: #include "stdafx.h" #include <windows.h> int _tmain(int argc, _TCHAR* argv[]) { LONG res,res1; HKEY hkey; CHAR childkey[100] ="SOFTWARE"; res = RegOpenKeyEx(HKEY_LOCAL_MACHINE,childkey,NUL...more >>

hi, i am teaching a class using visual studio 2003 in the labs at school and trying to get some pure c++ into a dll so i can sic nunit on it. trying to put the code below into a .net class library gets unresolved externs: pure error LNK2020: unresolved token (0A000006) _CxxThrowException ...more >>

Hi, Can some one tell me from where can I download the GDI+ SDK to use with VC6. Thanks, -Asfar ...more >>

Hi All, Can someone help me out how can I resolve the error "0xC0000005: Access violation reading location 0x513112f4"? Steps I followed... 1. I ran the application at DOS prompt 2. After some time my application got crashed and windows popped up a window asking for debug, send error rep...more >>

I m new to MC++ and interoperability and I try to find a bug since a long time without succes, maybe you can help me ? (I have a sample project if you want, you can contact me at cdemez2@hotmail.com too) I describe the problem: I have 2 MS VC2003 projects... and have difference between ...more >>

Hi, I'm trying to create an unmanaged instance within a managed object. In the one module, I've constructed an unmanaged class that makes a lot of API calls. It compiles with no errors. In the other module, when an instance of the unmanaged class is created, a Link error is encountered. (Un...more >>

Hi I am including a class into my mixed managed/unmanaged C++ application that uses MFC classes such as CSTRING. #include <afx.h> // have to include this in order to compile #include "CSharedMemory.h" In order to get my project to build, I have to change the project settings to use ...more >>

Hi, I need define a global COM object in a VC++8 project. But when I compile it, I get a error message: error C3145:'ComLibC1': global or static variable may not have managed type MYCOMLib::Class1^ (MYCOMLib is a COM Wrapper built in VC++6). My code looks like this: namespace MyApp { ...more >>

Hi, Is it possible to redirect the linker & compiler to use a similar function without getting complaints about 'function x already in blah.obj'? Of course, I'm not talking about a runtime hook but about compilation time. ...more >>

How do I get a handle to an object from one of its member functions? I cannot find anything in the docs that shows a handle version of the "this" pointer - but there has to be one - right? Thanks, -Chris ...more >>

I'm trying to do some pointer manipulation and can not avoid using void * as the type declaration. I get this error message : error C2036 : 'void *' : unknown size though. Is there a compiler option or a way to tell the compiler the size of void * to avoid this? On a side note, when using W...more >>

Hello all, find below an example which IMO should refuse to compile. It compiles fine with VS2005. What happens in the call? What is your opinion? Kind regards, Patrick class noncopyable { protected: noncopyable() {} ~noncopyable() {} private: // hide t...more >>

Well, my first .NET 2.0 app is done. I tested it here on two real machines and one virtual machine - worked fine in all of them. The first other person I gave the app to ran it and got the exception listed below. I asked if he'd installed the .NET 2.0 runtime, he said he downloaded and installed...more >>

I found a bug in VC++ .NET 2003 regarding default initialization of arrays of primitives in a constructor initialization list, as detailed in this post: http://groups.google.com/group/comp.lang.c++/msg/dab44a8b786b6a79 and in the reply by Dietmar Kuehl, in which he quotes the relevant portion...more >>

Hi, I'm puzzled about comments & intellisense. Sometimes, during programming, you get comments that were typed just above the declaration in the header files, but sometimes, not while -there are- comments just above the declaration. Is this simply a bug or are the special conditions that ...more >>

Recently I tried to use -G5 option on CL compiler (from Visual Studio 2005)... To my surprise, there is no processor specific optimizations anymore! Is that correct? Is so, why? []s Fred ...more >>

Hi, I am using managed cpp, /clr, VS2005 Prof., and I must wait for terrible long loading time for even simple forms. does anybody encouter this problem too or u have any solutions for this? thx, Petr ...more >>

Hi, Can I write a VC8 dll which used GDI+ and then use this dll in VC6. I will be using GDI+ to basically load a image in memory and annotate it with some text and save the image. Any pointers on how I can do this? Thanks, -Asfar ...more >>

Given class B C and D all inherit from class A They all override a method of the form: Add( A^ lhs, A^ rhs ); But only specific conversions are allowed So if i was defining Add for class D : D::Add( A^ lhs, A^ rhs ) { Value = ((D)lhs)->Value + ((D)rhs)->Value; } Ony C can be c...more >>

hi I am a beginner to vc++. I am opening a file("c:\Mydoc.doc") and reading data from it and afte that i just want to write data of 1.2 MB part from firs file("c:\Mydoc.doc") to New file("c:\Newdoc1.doc") and remaining t other file("c;\Newdoc2.doc"). Code is Giving warning . Pls Help me How...more >>

Hi, In header file, I see this declaration: #define DECLARE_VTBL(iname) iname vt##iname; then, in C file, there are below codes: typedef struct _Abc { .......... } abc; DECLARE_VTBL(abc) I don't understant these code. Could someone explain me what it does? Thanks Tran Hon...more >>

Hi, I have written a win32 console application(exname1.exe) which runs for ten minutes.I am calling this exname1.exe from another exe named exname.exe using shellexecuteex.Now from exname.exe coding i have to check whether exname1.exe is already running or not.How to find whether a win32 cons...more >>

It seems that windows file systems can have files dated to 1617, and unfortunately if you call _findfirst/_findnext on such a directory, msvcr80d will assert. Is there some provision for changing msvcr80d so that this assert doesn't happen? Debug Assertion Failed! File: dtoxtm64.c Line...more >>

Is there a way, using the CreateProcess/CreateProcessAsUser api's to launch an application with it windows hidden upon startup?...more >>

I am trying to create a process at a particular set of coordinates (for example 1,1) but the CreateProcess api seemingly ignores the settings in the dwX and dwY properties of the STARTUPINFO structure which I have initialized as follows: STARTUPINFO si; ZeroMemory((PVOID)&si, sizeof(si)); ...more >>

I've extended the article "Covariance and Contravariance in Delegates" from the C# Programmers' Guide, and it seems contravariance of delegates is implemented wrong. Lambda calculus states that Handler2Method is a subtype of HandlerMethod... why can't I convert? However the last line does ...more >>

I seem to be running into an issue where I am deriving a new class from a struct with a different alignemnt via the pragma pack #pragma pack(1) typedef struct { unsigned short a; unsigned int b; } MyBase; #pragma pack() class CDerived : public MyBase { public: unsigned short c...more >>

Hi All, I have done some C, C++, C# development over the years, but wouldn't call myself an 'expert' at any of them (this has always been a part-time, write what is needed endeavor with whatever language was available or necessary). My networking experience (in programming anyway) is even...more >>

Hi, I am trying to find const variables outside a class. Thur far I did not succeed. Without const, the variable is found but with const not. So, how can I get hold on global const variables using reflection? Regards, Rob // reflection.cpp : main project file. #include "stdafx.h"...more >>