chapter10_gitclient.cpp

ATL开发指南PDF格式

//
// Chapter10_GITClient.cpp
//

#include <windows.h>

// Include ATL
#include <atlbase.h>
CComModule _Module;
#include <atlcom.h>
#include <atlimpl.cpp>

BEGIN_OBJECT_MAP(ObjectMap)
END_OBJECT_MAP()

#include "..\Chapter10_GITServer\Chapter10_GITServer.h"
#include "..\Chapter10_GITServer\Chapter10_GITServer_i.c"

void DisplayMessage( char* szMsg )
{
   MessageBox( 0, szMsg, "Chapter10_Client", MB_OK | MB_TOPMOST );
}

void HandleError( char*szMsg, HRESULT hr )
{
   char szMessage[128];
   wsprintf( szMessage, "%s. HR = %x", szMsg, hr );
   DisplayMessage( szMessage );
   CoUninitialize();
}

class CCallBack :
   public CComObjectRoot,
   ICallBack
{

public:
   CCallBack() {}

BEGIN_COM_MAP(CCallBack)
   COM_INTERFACE_ENTRY(ICallBack)
END_COM_MAP()

// ICallBack
public:
   STDMETHODIMP ComputationComplete(long lResult)
   {
      char szMsg[128];
      wsprintf( szMsg, "The result is %d", lResult );
      DisplayMessage( szMsg );

      // Terminate the application when we
      // get the result of the last computation
      if ( lResult == 3000 )
         PostQuitMessage( 0 );

      return S_OK;
   }

   STDMETHODIMP Error(BSTR bstrMessage)
   {
      USES_CONVERSION;
      DisplayMessage( W2A( bstrMessage ));
      return S_OK;
   }
};

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE, LPSTR, int)
{
   CoInitializeEx( 0, COINIT_APARTMENTTHREADED );

   // Initialize the ATL module
   _Module.Init( ObjectMap, hInst );

   // Create an instance of our math component
   CComPtr<IMath> ptrMath;
   HRESULT hr;
   hr = CoCreateInstance( CLSID_Math,
                          NULL,
                          CLSCTX_SERVER,
                          IID_IMath,
                          (void**) &ptrMath );

   if ( FAILED( hr ))
   {
      HandleError( "Failed to create server instance", hr );
      return -1;
   }

   // Create an instance of our CallBack component
   CComObject<CCallBack>* pCallBack;
   CComObject<CCallBack>::CreateInstance( &pCallBack );

   // QueryInterface for ICallBack and pass
   // it to the component
   CComPtr<ICallBack> ptrCallBack;
   pCallBack->GetUnknown()->QueryInterface( IID_ICallBack, (void**) &ptrCallBack );
   ptrMath->Advise( ptrCallBack );

   // Access the IMath functionality
   // As the computations complete, the callback
   // implementation will display a message box
   ptrMath->Add( 300, 10 );
   ptrMath->Subtract( 300, 10 );
   ptrMath->Divide( 300, 10 );
   ptrMath->Multiply( 300, 10 );

   // Sit in a message loop until the 
   // last notification is fired
   // An STA must pump messages
   MSG   msg;
   while (GetMessage( &msg, NULL, 0, 0 ))
   {
      TranslateMessage( &msg );
		DispatchMessage( &msg );
   }

   // Shut down the connection
   ptrMath->Unadvise();

   // Release our interfaces
   if ( ptrMath )
      ptrMath = 0;
   if ( ptrCallBack )
      ptrCallBack = 0;

   CoUninitialize();

   return 0;
}