Hey, I wrote a managed c++ class library in viusal studio 2005. This managed c++ dll calls native C++ methods of an SDK. When I referenced this managed c++ library in a console applciation written in C# for testing every thing worked fine. Now I need to call the managed c++ class library thro...more >>

hi all, I'm writing because I haven't been able to find enough information at the book stores and at the MS web site on some of my questions. Perhaps I'm asking the wrong questions, but if you could help me out here, I'd really appreciate it. Iam a project trainee. I have to ...more >>

Hi I have a static event called PropertyChanged. PropertyChanged is a delegate called PropertyChangedEventHandler(Object^ sender, PropertyChangedEventArgs^ e) If I remove my PropertyChangeEventArg parameter from the delegate and replace it with a string, the project compiles. Here is...more >>

Could anyone recommend to me any good books or online articles that contain in depth coverage of portable C++ development? Specifically writing binary compatible C++ interfaces and code that will work and be fully compatible where code built under multiple versions of the compiler/runtime are...more >>

1) how can I remove the GPS trail markings from my saved .est file? I have the same problem with calculated distance marks. 2) can I export the GPS trail data that is captured on to a spreadsheet so that I can: retreve my exact route, speed, etc.? -- :-)...more >>

Hello! My goal is to develop a program that opens a bitmap, copies its pixels to an ArrayList in order to perform some complex calculations (edge detection, Hough transform etc.), and save resulting image back in some other bitmap. It works pretty fast, except for stages of coping pixels ...more >>

Is it possible to pass variable length parameters to a C function exported in a DLL (i.e. using varargs.h without resorting to say passing a delimited string to be parsed in the function)? i.e. I want something like this: #include <varargs.h> CCONV foo( char* fmt, va_list args ) ; wh...more >>

I am using Visual Studio 2005 and wish to program using managed C++ code. I am writing an application to take still images from a webcam. I have created an interop 'reference' to the platform SDK dll for Windows Image Acquisition (WIA). This has created a set of classes under "Interop.WIAL...more >>

Hi ! If I will make char* pHugeMemory = (char*)malloc( huge_number_of_bytes ); in some place of my program, and after some time my program will jump to other processing place, that won't reference pHugeMemory location, then if physical memory storage is full, I suppose Windows, will disca...more >>

have been asked to do the following: Create an application that will take an e-mail address entered by the user into a field and, once a button is clicked, will take that e-mail address and check it against the mail server for that address using SMTP to determine if it's a valid or invalid ma...more >>

I have the following warning: warning C4345: behavior change: an object of POD type constructed with an initializer of the form () will be default-initialized Should I care (if yes, why?) Should I worry (if no, under what conditions should I worry ? - if yes why?) I looked on the MS site...more >>

Hello all I have a program that parses 5 XML documents and from there it needs to write a report. At the moment the report is being written as a flat ASCII file, but managers want the output to have pretty pictures and colors (damn managers). Which libs can I use to write to an MS-Word an...more >>

Hi, I have a visual c++ project that refuses to build when the project is in clearcase. It kept complaining that it could not open an include file. I'm pretty sure that all my include paths are set correctly because other files in the same directory could be included successfully. In fact I d...more >>

Sorry to bother everyone, but where do I go to discuss SAPI (speech recognition) software? Thanx! ...more >>

Hello, I'm attempting to apply Registration-free COM Activation Context API and I'm having a heck of a time doing it. The problem seems to be the way the API works - or doesn't work, as it were. The CreateActCtx does not seem to pay proper attention to the lpAssemblyDirectory in the ACTCTX st...more >>

Can you tell me if the vcbuild $ALL is the same as the msdev ALL? If so, how do I use it? I have a VS 6.0 command "msdev ProjectName.dsw /make ALL /clean" which, I believe, builds all the .dsp configurations in the .dsw file. I'm trying to figure out how to accomplish the same thing using vcbui...more >>

I have a managed C++ API which calls extensively into native API. I would like to remove the security walk above!! in C# I could tag my declaration like that: [System::Security::SuppressUnmanagedCodeSecurityAttribute] extern static void SomeCFunction(); but in managed C++ I don't declare ...more >>

In C# I could remove security check on an C DLL call by tagging my function as follow: [System::Security::SuppressUnmanagedCodeSecurityAttribute] [DllImport("SomeDll.dll")] static extern void SomeMethod(); In Managed C++ I don't declare the function I just #include the headers. How could ...more >>

Hello, I have coded a program to change the IP-Adress Settings on a windows xp workstation. Works with an admin account without problems. Now I like to give some Users the program so that they can also change the IP-Settings to logon to different Networks. The problem is that a normal User ...more >>

Dear all, I have a VC project related with SQL server database operation, when I only handle a few records , this project can run perfectly, but when I use this project to handle more than 2000 records, it will run into a debug information as the following lines detailed. //comutil.h ...more >>

Hi All, I have a VC++ application its a bit big application having more than 10 ATL components. The application is client/server architecture with multi-threading. The server does the data trasnfer from one database to another using ODBC/OLEDB. If at all I want to change the technology f...more >>

Boost BSTR performance by 3000% http://technolog.nl/eprogrammer/archive/2006/07/25/1009.aspx...more >>

I have an application which use has a DLL with 100+ (auto-generated) Managed C++ wrapper around some native API. Compare to a purely version my application has some performance issue and I just realized it is probably due to the security check which happen just before each of the (numerous)...more >>

Hi,all I use the following code to read 10000 bytes from a file(fp1) and write them to another file(fp2). char *pStr = new char[10001]; fread(pStr,dw_size,1,fp1); int i = 0; while(i<10000) { fwrite(pStr,1,1,fp2); pStr++; } I fou...more >>

I am developing compression application in C++ (vs2k5) using zlib library for compressing files/folders. I understand how to compress a single file, but is there any way to compress a folder containing subfolder and files? I mean is there some single function that does this or will I have to writ...more >>

I have a VB6 ActiveX dll and it's called from a VC++ app. How can I debug the dll through the app? Please help. Thanks....more >>

Hi all In vb I do: Dim Ex As New Excel.Application Ex.Workbooks.Open "c:\tmp\Book1.xls" Similar code in VC doesn't work: #pragma comment(lib, "ole32.lib") #import "c:\program files\Microsoft Office\OFFICE11\XL5EN32.OLB" rename("DialogBox","__AA__") /* ... */ Excel::Ap...more >>

Hi all I would like to know if it is possible to build a dll with VS2005 C++ Express Edition, that is unmanaged, and that is not dependent on the .NET framework. So the dll should be able to run on a machine that doesn’t have the .NET framework installed. Is that possible or would I need...more >>

Hello! Is it possible to use ArrayList as a 2-dimensional list? I want to keep a bitmap in it, and I would like to access its elements by providing two parameters (row and column) rather than calculating offset from the begin. Thanks in advance for any hints. -- Iwanow ...more >>

hi, i have the following piece of code in a program compiled using both VC8 and VC6. it basically just writes out two arrays to cout. the VC6 program takes about 4 seconds to go through that bit of code whereas the VC8 program takes almost 18 seconds ! can someone tell me why this is so ? is t...more >>

Pinning a regular managed array is pretty easy in C++/CLI, such as: if buffer is defined thusly: array<System::Byte^> buffer pinning it would be something like: pin_ptr<unsigned char> pinBuf = &buffer[0]; What I'm curious about, though, is whether or not it's possible to pin a generic c...more >>

I have written a Dll which contains a class. I overload the "<<" opertor in global functions to perform Ostream operations - a follows: ostream &operator << (ostream &os, const struct _mystruct_t &ms) However (perhaps unsuprisngly), my function is not expoted in the DLL/lib - and when I tr...more >>

Hello I have struct, and class that handle array of previous mentioned structs. How to declare struct member, that will point to class that it belongs? struct S { //HOW TO ADD MEMBER THAT WILL POINT TO CLASS C ??? } class C { S** items; } Thanks Milan...more >>

Hi, Does anyone know whether it is possible for a VC program to find out about its own memory usage? Thanks. regards, Daniel ...more >>

Hi all, I've found this amusing project: http://inpainting.alpha-sigma.net/ but there are only source codes, the author suggests to compile it with Visual Studio .NET 7.1 or more. The problem is that I don't have it, and I'm searching a way to compile it without the Visual Studio 7.1 is it...more >>

I will quickly try to write a code that shows my intention. I will pass unnecessary code. typedef void(FP*)(LONG _param1, LONG _param2, BYTE* _pData); class CNative { public: FP m_CallBack; private: void JobDone() { for(iter i = m_Jobs.begin();i!=m_Jobs.end();++i) { ...more >>

I'm shopping around to figure out where I'm going to devote my finite energies as I get back into the windows world. A question that pops up right away for a lot of fellas is, if I'm going to be doing stuff in the dot net world, do I go c++/CLI or c#. Some people might be able to do both, bu...more >>

We use VS6.0 to support our automated build environment, and we'd like to move to something that is currently supported. One aspect of VS6.0 is part of the "Generate Makefile" feature, which it seems was removed in VS 2003. Specifically, that feature creates dependency (.dep) files useful for th...more >>

Dear all, i have a problem on the sln file. After i have a error while coding, i close the VS studio and find the sln file to open the project. But i discover that the sln file become 0kb and i couldnt open it. However, the .h and .cpp are still there. could i recover it ? thanks ...more >>

Hi, In VC8 project, I am having a struct which is having a char* variable. Now I am creating a 3 elements array object for the struct. I send the base address of the object using VARIANT to a function where I am casting to struct again using reinterpret_cast. Then If I am trying to tra...more >>

I want to create a class with a variably-sized array inlined. The array size will be known at each instantiation but not at compile time. Once created, arrays won't grow or shrink and their contents won't change. The array length will be accessible via a smart pointer located before the array...more >>

Hi, all I have a sample code like the following detailed: //----------------- FILE *fp1; fp1=fopen("F:\\aa.dat","rb"); if(!feof(fp1)) { // Step 1 :the following code is to read binary data from an existing file CString ss...more >>

Dear all, Could anyone tell me how to convert binary data in buffer to string format,thanks in advance! Anderson ...more >>

Hi, Iam linking my C++ project with some external libraries and getting the following error: someLib.lib(omeObj.obj) : LNK9038: module unsafe for SAFESEH image. I do not have exception handling turned on in my main project (no /GX /Eh options). What is wrong? Matej...more >>

I need to implement reference counting in a class hierarch, in a thread safe manner. (The classes are umanaged but I might want to compile them with the /clr option.) Some of the objects - atoms - are registered in a global hash table - let's call it an atom table. When an atom refernce count...more >>

Hi all, What's the "best" way to determine an EXE file's DLL dependencies from within a program? I basically need to figure out which DLL's are required by an EXE like Dependency Walker, from within a C++ application. Thanks ...more >>

Hi, I have a question for CString. My C++ code is detailed as below, FILE *fp1; fp1=fopen("F:\\aa.dat","rb"); if(!feof(fp1)) { // Step 1 :the following code is to read binary data from an existing file CString ss; fread(ss.Get...more >>

Hi, all I have a stored procedure created in SQL Server like the following lines. // stored proceudre code starts here CREATE PROCEDURE sp_insertdata @strdata varchar(250) , @rsult BIT OUTPUT , @erridx CHAR(7) OUTPUT AS ...more >>

Hi, all Could any boday tell me why I failed to create instance here in the following code ? Codes sample -------------------------------------------------------------------- void CInsertDataTestDlg::OnBnClickedButton1() { _ConnectionPtr pMyConnect=NULL; HRESULT hr=pMyConnec...more >>

Hi all, When I use the below line code to execute a stored procedure , I got a error as described below: My code line : pMyConnect->Execute("EXEC sp_test" ,&RecordsAffected,adCmdProc); Error : error C2065: ¡°adCmdProc¡± : non-declared iden...more >>