C / C++ / MFC

<br />
STDMETHODIMP Ctest_com::print_me(BSTR txt)<br />
{<br />
  OutputDebugString(txt);<br />
  return S_OK;<br />
}<br />

<br />
// signature of print_me.<br />
// STDMETHODCALLTYPE is __stdcall<br />
typedef HRESULT (STDMETHODCALLTYPE* ptr_print)(BSTR); <br />
<br />
int _tmain(int argc, _TCHAR* argv[])<br />
{<br />
  CoInitialize(NULL);<br />
  <br />
  cpp_com_testLib::Itest_com* comobj;<br />
  HRESULT hr = CoCreateInstance(__uuidof(cpp_com_testLib::test_com),<br />
  NULL,<br />
  CLSCTX_INPROC_SERVER,<br />
  __uuidof(cpp_com_testLib::Itest_com),<br />
  (void**)&comobj);<br />
<br />
  int* vptr = (int*)(comobj); <br />
  vptr = (int*)*vptr;  // gets a pointer to the VTABLE<br />
  int* vproc0 = (int*)vptr[0]; // get a point to first function in VTable<br />
  ...<br />
  ...<br />
  ...<br />
  int* vproc7 = (int*)vptr[7]; // pointer to print_me() !<br />
<br />
  ptr_print p = (ptr_print)vproc7; // cast to the function pointer.<br />
  _bstr_t bstr(_T("MY TEXT!"));<br />
  p(bstr); // <--- happens the problem.<br />
<br />
  comobj->Release();<br />
<br />
  CoUninitialize();<br />
<br />
  return 0;<br />
}<br />