Help please. File is not created. Where problem?

LONG __stdcall MyCustomFilter( EXCEPTION_POINTERS* pep ); 
void CreateMiniDump( EXCEPTION_POINTERS* pep ); 
 
LONG __stdcall MyCustomFilter( EXCEPTION_POINTERS* pep ) 
{
    CreateMiniDump( pep ); 
 
    return EXCEPTION_EXECUTE_HANDLER; 
};
 void CreateMiniDump( EXCEPTION_POINTERS* pep ) 
{
    // Open the file 
 
    HANDLE hFile = CreateFile( TEXT("C:\\MiniDump.dmp"), GENERIC_READ | GENERIC_WRITE, 
        0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL ); 
 
    if( ( hFile != NULL ) && ( hFile != INVALID_HANDLE_VALUE ) ) 
    {
        // Create the minidump 
 
        MINIDUMP_EXCEPTION_INFORMATION mdei; 
 
        mdei.ThreadId           = GetCurrentThreadId(); 
        mdei.ExceptionPointers  = pep; 
        mdei.ClientPointers     = FALSE; 
 
        MINIDUMP_TYPE mdt       = MiniDumpNormal; 
 
        BOOL rv = MiniDumpWriteDump( GetCurrentProcess(), GetCurrentProcessId(), 
            hFile, mdt, (pep != 0) ? &mdei : 0, 0, 0 ); 
 
        
 
        // Close the file 
 
        CloseHandle( hFile ); 
 
    }
}

case IDC_BUTTON3:
void CreateMiniDump();