Adding Windows Media Support to the ltmmConvert Object for C++

The following code demonstrates how to add Windows Media support to the ltmmConvert Object.

#include "ltmm.h"

#include "assert.h"



HINSTANCE g_hInstance;  // application instance handle

IltmmConvert* g_pConvert;  // convert object's interface pointer



extern "C"

{

   // declare the windows media certificate creation function

   HRESULT STDMETHODCALLTYPE WMCreateCertificate( IUnknown** pUnkCert ); 

};



// link the stub library

#pragma comment(lib, "wmstub.lib")





int APIENTRY WinMain(HINSTANCE hInstance, 

                     HINSTANCE hPrevInstance, 

                     LPSTR     lpCmdLine, 

                     int       nCmdShow) 

{

   HRESULT hr; 

   IUnknown* punkCert; 

   

   g_hInstance = hInstance; 



   // initialize COM library

   hr = CoInitialize(NULL); 

   if(FAILED(hr)) 

      goto error; 

   

   // create the convert object

   hr = CoCreateInstance(CLSID_ltmmConvert, NULL, CLSCTX_INPROC_SERVER, IID_IltmmConvert, (void**) &g_pConvert); 

   if(FAILED(hr)) 

      goto error; 

   

   // create windows media certificate   

   hr = WMCreateCertificate(&punkCert); 

   if(SUCCEEDED(hr)) 

   {

      // assign the certificate to the convert object

      g_pConvert->put_WMCertificate (punkCert); 

      punkCert->Release();

   }   

   

#ifdef _DEBUG

   {

      // verify assignment

      g_pConvert->get_WMCertificate (&punkCert); 

      assert(punkCert != NULL); 

      if(punkCert) 

         punkCert->Release();

   }

#endif



//   TODO: place additional code here



error: 

   // cleanup



   if(g_pConvert) 

      g_pConvert->Release();



   CoUninitialize();

   

   return 0; 

}