IltmmSupportManager::UnlockSupport Example for C

LPOLESTR T2OLE(LPCTSTR lpt) 
{ 
   static OLECHAR lpw[512]; 
 
   if(!lpt) 
      return NULL; 
 
   lpw[0] = L'\0'; 
 
   MultiByteToWideChar(CP_ACP, 0, lpt, -1, lpw, 512); 
 
   return lpw; 
} 
 
HRESULT IltmmSupportManager_UnlockSupport_Example (IltmmSupportManager* pSprtMngr) 
{ 
   VARIANT_BOOL vb;  
 
   HRESULT hr = CoCreateInstance(&CLSID_ltmmSupportManager, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmSupportManager, (void**)&pSprtMngr);  
 
   if (hr != S_OK)  
      return -1;  
 
   IltmmSupportManager_IsSupportLocked (pSprtMngr, L_SUPPORT_CONVERTFROMDVD, &vb);  
 
   if (vb == VARIANT_TRUE)  
   { 
      hr = IltmmSupportManager_UnlockSupport (pSprtMngr, L_SUPPORT_CONVERTFROMDVD, T2OLE("DVDKey"));  
 
      if (hr != S_OK)  
      { 
         IltmmSupportManager_Release(pSprtMngr);  
 
         return hr;  
      } 
 
      IltmmSupportManager_IsSupportLocked (pSprtMngr, L_SUPPORT_CONVERTFROMDVD, &vb);  
 
      if (vb != VARIANT_FALSE)  
         return E_FAIL;  
 
      return S_OK;  
   } 
 
   return S_OK;  
} 
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