using VC++ 6.0 components in C#

Question

Hi  im using component developed using VC++ 6.0 in C# which uses some other component. At some function calls which are of that other component throws following exception ************** Exception Text ************** System.Runtime.InteropServices.COMException (0x80010105): The server threw an exception. where as when i'm using component in C++ (VC 6) it works just fine some times it gves exception and crashes the value of ESP was not properly saved across function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

ds_prasad_2000 · Answer

thanks a lot i got the solution i was using a third party component in my compnent and i was using IDipatch to type cast out parameter of that componenets inteface method like this IMYPtr *ptr; somePtr->getFactory((IDispatch**)&ptr) this was the problem. in C# when i was using componentthere was some layout related problem and getting mangling pointer to above ste.when i was using pointer it was crashing though it was not null. work around for this is like this IMYPtr *ptr; IDispatch *pdisp; somePtr->getFactory(&pdisp); pdisp->QueryInterface(__uuidof(IMYPtr)(void**)&ptr);

frank.kerrigan · Answer

// BEFORE PAGE_LOAD ETC #region Dll Imports [DllImport(C:\WINDOWS\system32\myDll.dll EntryPoint=IsByteArray ExactSpelling=false CallingConvention=CallingConvention.StdCall)] static extern int IsFile( byte[] pbByteArray int cbByteArray); [DllImport(C:\WINDOWS\system32\myDll.dll EntryPoint=IsCharArray ExactSpelling=false CallingConvention=CallingConvention.StdCall)] static extern int IsCharFile( char[] pbCharArray int cbCharArray); #endregion private void test () { int TheTest = IsByteArray(byarry) }

ds_prasad_2000 · Answer

that will be great help

frank.kerrigan · Answer

I've did this about a year ago anf have the code somewhere will try and get it for you