chapter6_nativeclient.cpp

ATL开发指南PDF格式

//
// Chapter6_NativeClient.cpp
//

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

#import "..\Chapter6_Server\Debug\Chapter6_Server.dll" no_namespace named_guids

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

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

   IMathPtr ptrMath;

   // Create an instance of the server
   try 
   {
      HRESULT hr;
      hr = ptrMath.CreateInstance( CLSID_Math );
      if ( FAILED( hr ))
         _com_issue_error( hr );
   }
   catch( _com_error& e )
   {
      cout << "Error creating instance" << endl;
      cout << "HRESULT message is " << e.ErrorMessage() << endl;
      if ( e.ErrorInfo() )
         cout << e.Description() << endl;

      return -1;
   }

   // Access the IMath interface
   try
   {
      _variant_t result;
      _variant_t Op1( long( 100 ));
      _variant_t Op2( long( 200 ));

      result = ptrMath->Add( Op1, Op2 );
      cout << "100 + 200 = " << long( result ) << endl;
   }
   catch( _com_error& e )
   {
      cout << "Error accessing IMath" << endl;
      cout << "HRESULT message is " << e.ErrorMessage() << endl;
      if ( e.ErrorInfo() )
         cout << e.Description() << endl;
   }
     

   // We have to release the pointer here
   // because if we call CoUninitialize before
   // it goes out of scope, we'll get an exception
   ptrMath = 0;

   CoUninitialize();

   return 0;
}