IltmmCapture::get_TargetStream Example for C++

// This function will write the contents of the target 
// data for the passed capture object to a disk file 
void WriteTargetMemory(LPCWSTR lpwszFileName, IltmmCapture *pCapture) 
{ 
   HANDLE hFile = NULL; 
    
   // open file for output 
   hFile = CreateFile(lpwszFileName, // open file name 
      GENERIC_WRITE,              // open for writing 
      FILE_SHARE_READ,            // share for reading 
      NULL,                       // no security 
      CREATE_ALWAYS,              // re-create the file 
      FILE_ATTRIBUTE_NORMAL,      // normal file 
      NULL);                      // no attr. template 
 
   if (hFile == INVALID_HANDLE_VALUE) 
      return; 
 
   long fl = 0; 
   unsigned long lBytesWritten; 
   IltmmMemory *pTarget = NULL; 
    
   // try to get the target stream 
   pCapture->get_TargetStream((IUnknown**)&pTarget); 
   if(!pTarget) 
      return; 
    
   VARIANT varData; 
   unsigned char *pBuffer = NULL; 
   SAFEARRAY sa; 
 
   // get the buffer size and initialize a variant 
   pTarget->get_BufferSize(&fl); 
   VariantInit(&varData); 
    
   // setup the safe array 
   memset(&sa, 0, sizeof(sa)); 
   sa.cbElements = sizeof(unsigned char); 
   sa.cDims = 1; 
   sa.fFeatures = (FADF_AUTO | FADF_FIXEDSIZE); 
   sa.pvData = new UCHAR[fl]; 
   sa.rgsabound[0].cElements = fl; 
 
   // associate the safe array with our variant 
   V_VT(&varData) = (VT_ARRAY | VT_UI1); 
   V_ARRAY(&varData) = &sa; 
 
   // copy the target data to the variant safe array and to our buffer 
   pTarget->CopyData(0, fl, &varData); 
   SafeArrayAccessData(V_ARRAY(&varData), (void**)&pBuffer); 
 
   // write the buffer out to our file 
   WriteFile(hFile, pBuffer, fl, &lBytesWritten, NULL); 
 
   // clean up the variant 
   SafeArrayUnaccessData(V_ARRAY(&varData)); 
   VariantClear(&varData); 
 
   // close the output file 
   CloseHandle(hFile); 
    
   // release the target object 
   pTarget->Release(); 
}

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