Adding Windows Media Support to the ltmmPlay Object for C
The following code demonstrates how to add Windows Media support to the ltmmPlay Object.
// define helper macros for using interfaces under C
#define COBJMACROS
#include "ltmm.h"
#include "assert.h"
HINSTANCE g_hInstance; // application instance handle
IltmmPlay* g_pPlay; // play object's interface pointer
// 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 play object
hr = CoCreateInstance(&CLSID_ltmmPlay, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmPlay, (void**) &g_pPlay);
if(FAILED(hr))
goto error;
// create windows media certificate
hr = WMCreateCertificate(&punkCert);
if(SUCCEEDED(hr))
{
// assign the certificate to the play object
IltmmPlay_put_WMCertificate(g_pPlay, punkCert);
IUnknown_Release(punkCert);
}
#ifdef _DEBUG
{
// verify assignment
IltmmPlay_get_WMCertificate(g_pPlay, &punkCert);
assert(punkCert != NULL);
if(punkCert)
IUnknown_Release(punkCert);
}
#endif
// TODO: place additional code here
error:
// cleanup
if(g_pPlay)
IUnknown_Release(g_pPlay);
CoUninitialize();
return 0;
}