chapter4_atlclient.cpp

ATL开发指南PDF格式

//
// Chapter4_ATLClient.cpp
//

#include <windows.h>
#include <tchar.h>
#include <iostream.h>

#include <atlbase.h>
#include <atlimpl.cpp>

#include "..\Chapter4_Server\Chapter4_Server_i.c"
#include "..\Chapter4_Server\Chapter4_Server.h"

void HandleError( IUnknown* pUnk, REFIID riid )
{
   HRESULT hr;

   // See if the object supports rich error info
   ISupportErrorInfo* pSEI = 0;
   hr = pUnk->QueryInterface( IID_ISupportErrorInfo, (void**) &pSEI );
   if (SUCCEEDED( hr ))
   {
      hr = pSEI->InterfaceSupportsErrorInfo( riid );
      if ( SUCCEEDED( hr ))
      {
         // Get the error info
         IErrorInfo* pEI;
         if ( SUCCEEDED( GetErrorInfo( 0, &pEI )))
         {
            USES_CONVERSION;

            BSTR bstrDescription = 0;
            BSTR bstrSource = 0;

            pEI->GetDescription( &bstrDescription );
            pEI->GetSource( &bstrSource );

            cout << OLE2T( bstrDescription ) << endl;
            cout << OLE2T( bstrSource ) << endl;

            ::SysFreeString( bstrDescription );
            ::SysFreeString( bstrSource );

            pEI->Release();
         }
      }
      pSEI->Release();
   }
}

int main( int argc, char *argv[] )
{
   cout << "Initializing COM" << endl;

   if ( FAILED( CoInitialize( NULL )))
   {
      cout << "Unable to initialize COM" << endl;
      return -1;
   }

   CComPtr< IMath > ptrMath;
   HRESULT hr;
   // This time use CoCreateInstance
   hr = CoCreateInstance( CLSID_Math,
                          NULL,
                          CLSCTX_LOCAL_SERVER,
                          IID_IMath,
                          (void**) &ptrMath );

   if ( FAILED( hr ))
   {
      cout.setf( ios::hex, ios::basefield );
      cout << "Failed to create server instance. HR = " << hr << endl;
      CoUninitialize();
      return -1;
   }

   // Access the IMath interface
   long lResult;
   ptrMath->Add( 134, 353, &lResult );
   cout << "134 + 353 = " << lResult << endl;

   // Try to divide by zero
   hr = ptrMath->Divide( 0, 0, &lResult );
   if ( FAILED( hr ))
   {
      HandleError( ptrMath, IID_IMath );
   }

#if 0
   // Access IMath2
   CComQIPtr<IMath2,
             &IID_IMath2> ptrMath2( ptrMath );
   if ( ptrMath2 )
   {      
      ptrMath2->Compute( mathAdd, 
                       100,
                       200,
                       &lResult );
      cout << "100 + 200 = " << lResult << endl;
   }

   // Access IAdvancedMath
   CComQIPtr<IAdvancedMath,
             &IID_IAdvancedMath> ptrAdvancedMath( ptrMath );
   if ( ptrAdvancedMath )
   {      
      ptrAdvancedMath->Factorial( 12, &lResult );
      cout << "12! = " << lResult << endl;
      ptrAdvancedMath->Fibonacci( 12, &lResult );
      cout << "The Fibonacci of 12 = " << lResult << endl;
   }   

   // Access IComponentInfo
   CComQIPtr<IComponentInfo,
             &IID_IComponentInfo> ptrCompInfo( ptrMath );
   if ( ptrCompInfo )
   {      
      COMPONENT_INFO* pInfo = 0;
      ptrCompInfo->get_Info( &pInfo );
      cout << "Component author is " << pInfo->pstrAuthor << endl;
      cout << "Component version is " << pInfo->sMajor << "." << pInfo->sMinor << endl;

      USES_CONVERSION;
      cout << "Component name is " << OLE2T( pInfo->bstrName ) << endl;

      if ( pInfo->pstrAuthor )
         CoTaskMemFree( pInfo->pstrAuthor );
      if ( pInfo->bstrName )
         SysFreeString( pInfo->bstrName );

      if ( pInfo )
         CoTaskMemFree( pInfo );
   }
#endif
   // Release the smart pointer before CoUninitialize
   if ( ptrMath )
      ptrMath = 0;
#if 0
   if ( ptrMath2 )
      ptrMath2->Release();
   if ( ptrAdvancedMath )
      ptrAdvancedMath->Release();
   if ( ptrCompInfo )
      ptrCompInfo->Release();
#endif

   CoUninitialize();

   return 0;
}