LTwain::CancelAcquire

class CMyTwainCA : public LTwain 
{ 
public: 
   L_INT BitmapCallBack(pBITMAPHANDLE pBitmap); 
   HTWAINTEMPLATEFILE m_hFile; 
}; 
L_INT CMyTwainCA::BitmapCallBack(pBITMAPHANDLE pBitmap) 
{ 
   UNREFERENCED_PARAMETER(pBitmap); 
   CancelAcquire(); 
   return SUCCESS; 
} 
// initialize session and call this function 
L_INT LTwain__CancelAcquireExample(pBITMAPHANDLE pBitmap, HWND hWnd) 
{ 
   L_INT             nRet; 
   CMyTwainCA        TwainSession; 
   APPLICATIONDATA   AppData; 
   memset(&AppData, 0, sizeof(APPLICATIONDATA)); 
   AppData.hWnd = hWnd; 
   AppData.uStructSize = sizeof(AppData); 
   lstrcpy (AppData.szManufacturerName, _T("LEAD Technologies, Inc.")); 
   lstrcpy (AppData.szAppProductFamily, _T("LEAD Test Applications")); 
   lstrcpy (AppData.szVersionInfo, _T("Version 1.0")); 
   lstrcpy (AppData.szAppName, _T("TWAIN Test Application")); 
   nRet = TwainSession.InitSession(&AppData); 
   if (nRet != TWAIN_SUCCESS) 
   { 
      MessageBox(hWnd, TEXT("Error occurred during call InitSession"), TEXT("Notice"), MB_OK); 
      return nRet; 
   } 
   TwainSession.EnableCallBack (TRUE); 
   nRet = TwainSession.Acquire(pBitmap, sizeof(BITMAPHANDLE), LTWAIN_SHOW_USER_INTERFACE, NULL); 
   if (nRet == SUCCESS) 
      MessageBox(NULL, TEXT("The image acquisition process completed."), TEXT("Notice"), MB_OK); 
   else 
   { 
      MessageBox(NULL, TEXT(" The image acquisition process failed!"), TEXT("Error"), MB_OK); 
      return nRet; 
   } 
   nRet = TwainSession.EndSession(); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
}