client.cpp

ATL开发指南PDF格式

//
// Client.cpp
//

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

#include <initguid.h>
#include "..\server\imath.h"


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

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

   // Get the unique CLSID from the ProgID
   CLSID clsid;
   HRESULT hr = ::CLSIDFromProgID( L"Chapter2.Math.1", &clsid );
   if ( FAILED( hr ))
   {
      cout.setf( ios::hex, ios::basefield );
      cout << "Unable to get CLSID from ProgID. HR = " << hr << endl;
      return -1;
   }

   // Get the class factory for the Math class
   IClassFactory* pCF;
   hr = CoGetClassObject( clsid,
                          CLSCTX_INPROC,
                          NULL,
                          IID_IClassFactory,
                          (void**) &pCF );
   if ( FAILED( hr ))
   {
      cout.setf( ios::hex, ios::basefield );
      cout << "Failed to GetClassObject server instance. HR = " << hr << endl;
      return -1;
   }

   // using the class factory interface create an instance of the
   // component and return the IUnknown interface.
   IUnknown* pUnk;
   hr = pCF->CreateInstance( NULL, IID_IUnknown, (void**) &pUnk );

   // Release the class factory
   pCF->Release();

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

   cout << "Instance created" << endl;

   IMath* pMath = NULL;
   hr = pUnk->QueryInterface( IID_IMath, (LPVOID*)&pMath );
   pUnk->Release();
   if ( FAILED( hr ))
   {
      cout << "QueryInterface() for IMath failed" << endl;
      CoUninitialize();
      return -1;
   }

   long result;
   pMath->Multiply( 100, 8, &result );
   cout << "100 * 8 is " << result << endl;

   pMath->Subtract( 1000, 333, &result );
   cout << "1000 - 333 is " << result << endl;

   // Try IAdvancedMath, QI through IMath
   IAdvancedMath* pAdvMath = NULL;
   hr = pMath->QueryInterface( IID_IAdvancedMath, (LPVOID*)&pAdvMath );
   if ( FAILED( hr ))
   {
      cout << "QueryInterface() for IAdvancedMath failed" << endl;
      pMath->Release();
      CoUninitialize();
      return -1;
   }

   pAdvMath->Factorial( 10, &result );
   cout << "10! is " << result << endl;

   pAdvMath->Fibonacci( 10, &result );
   cout << "The Fibonacci of 10 is " << result << endl;

   cout << "Releasing IMath interface" << endl;
   pMath->Release();

   cout << "Releasing IAdvancedMath interface" << endl;
   pAdvMath->Release();

   cout << "Shuting down COM" << endl;
   CoUninitialize();

   return 0;
}