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#include <objbase.h>
#include "interface.h"
//-----------//
// Client
//-----------//
void main()
{
HRESULT hr;
IUnknown* pIUnknown;
IComponent* pIComponent;
IClassFactory* pIClassFactory;
::CoInitialize(NULL);
/*
//Once the CoCreateInstance is called , the component will be created and the client can not
// control it, that's why CoCreateInstance is inflexible and the solution is to call CoGetClassObject function
hr = ::CoCreateInstance(CLSID_Component,NULL,CLSCTX_INPROC_SERVER,IID_IUnknown,(void**)&pIUnknown) ;
if (SUCCEEDED(hr))
{
hr=pIUnknown->QueryInterface(IID_IComponent,(void**)&pIComponent);
if(SUCCEEDED(hr))
pIComponent->Print("COM from scratch.");
}
*/
//---------------------//
// improving the client
//---------------------//
// By calling the CoGetClassObject function , the client can control creation of the component
hr=CoGetClassObject(CLSID_Component,CLSCTX_INPROC_SERVER,NULL,IID_IClassFactory,(void**)&pIClassFactory);
if (SUCCEEDED(hr))
{
hr=pIClassFactory->CreateInstance(NULL,IID_IComponent,(void**)&pIComponent);
if(SUCCEEDED(hr))
{
pIComponent->Print("COM from scratch.");
pIComponent->Release();
}
}
::CoUninitialize ();
}
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