Memory Violation Exception

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VisualC++

Hi all ,
Question has already been posted by was not with much information .
Now here the one with little more information of the problem.


I have a function in mfc(which is a dll type project) which extracts a zip file and creates folder which ultimately show up the files ,now this is used in C#.Net project so when I call this method from dll in the C#.net project not all files are extracted and shows up the error an AccessViolationExceptions occurs .

I guess this buffer which takes the extracted files there at the .net project is not able to allocate that much amount of memory..
I need advice on it ....

BYTE *buffer;
buffer = new BYTE[oFileData.lActualSize];
if( buffer == 0 )
{
    _tcscpy((*_errorText), szFilesFolder.GetBuffer() );
    szFilesFolder.ReleaseBuffer();
    CoTaskMemFree((*_errorText));

    return FAILTOALLMEM;
}

SIGNATURE of the function in mfc :

extern "C" _declspec(dllexport) int extractCompressedFile( TCHAR* _szFilePath, TCHAR* _extractPath, TCHAR** _errorText )

Calling in C#.Net

IntPtr BackupDLL = NativeMethods.LoadLibrary(somepath);
IntPtr procaddr = NativeMethods.GetProcAddress(BackupDLL, "extractCompressedFile");
C_ExtractPxlFiles func = (C_ExtractFiles)Marshal.GetDelegateForFunctionPointer(procaddr,typeof(C_ExtractFiles));
res = func(Program.ptc_SourFilePath, ptc_DestinationFilePath, ref errtext);
Program.strResult = res.ToString();
 

 
static class ExtNativeMethods
{
    [DllImport("kernel32.dll", CharSet = CharSet.Ansi)]
    public static extern IntPtr GetProcAddress(IntPtr hModule, [In][MarshalAsAttribute(UnmanagedType.LPStr)] string procedureName);
}