client.cpp

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// client.cpp
#include <iostream.h>
#include "Component\component.h" // Generated by MIDL

void main()
{
	cout << "Client: Calling CoInitialize()" << endl;
	CoInitialize(NULL);
	
	IUnknown* pUnknown;
	IDispatch* pDispatch;

	cout << "Client: Calling CoCreateInstance()" << endl;
	CoCreateInstance(CLSID_InsideCOM, NULL, CLSCTX_INPROC_SERVER, IID_IUnknown, (void**)&pUnknown);

	cout << "Client: Calling QueryInterface() for IDispatch on " << pUnknown << endl;
	pUnknown->QueryInterface(IID_IDispatch, (void**)&pDispatch);

	cout << "Client: Calling Release() for IUnknown on " << pUnknown << endl;
	pUnknown->Release();

	cout << "Client: Calling GetIDsOfNames" << endl;
	OLECHAR* name = L"Sum";
	DISPID dispid;
	pDispatch->GetIDsOfNames(IID_NULL, &name, 1, GetUserDefaultLCID(), &dispid);
	cout << "GetIDsOfNames(Sum) = " << dispid << endl;
		
	// Using positional parameters
	VARIANTARG SumArgsPos[2];
	VariantInit(&SumArgsPos[0]);
	SumArgsPos[0].vt = VT_I4;
	SumArgsPos[0].lVal = 7;
	VariantInit(&SumArgsPos[1]);
	SumArgsPos[1].vt = VT_I4;
	SumArgsPos[1].lVal = 2;

	VARIANT result;
	VariantInit(&result);

	DISPPARAMS Params1 = { SumArgsPos, NULL, 2, 0 };
	if(FAILED(pDispatch->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_METHOD, &Params1, &result, NULL, NULL)))
		cout << "pDispatch->Invoke() failed" << endl;

	cout << SumArgsPos[0].lVal << " + " << SumArgsPos[1].lVal << " = " << result.lVal << endl;

	// Using named arguments
	VARIANTARG SumArgsName[2];
	VariantInit(&SumArgsName[0]);
	SumArgsName[0].vt = VT_I4;
	SumArgsName[0].lVal = 5; // normally y
	SumArgsName[1].vt = VT_I4;
	SumArgsName[1].lVal = 7; // normally x
	DISPID DispIds[2] = { 0, 1 }; // y first, then x
	DISPPARAMS Params2 = { SumArgsName, DispIds, 2, 2 };

	if(FAILED(pDispatch->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_METHOD, &Params2, &result, NULL, NULL)))
		cout << "pDispatch->Invoke() failed" << endl;

	cout << SumArgsName[0].lVal << " + " << SumArgsName[1].lVal << " = " << result.lVal << endl;

	// Using positional optional arguments
	VARIANTARG SumArgsOpt[2];
	VariantInit(&SumArgsOpt[0]);
	SumArgsOpt[0].vt = VT_ERROR;
	SumArgsOpt[0].scode = DISP_E_PARAMNOTFOUND; // normally y
	VariantInit(&SumArgsOpt[1]);
	SumArgsOpt[1].vt = VT_I4;
	SumArgsOpt[1].lVal = 3; // normally x
	DISPPARAMS Params3 = { SumArgsOpt, NULL, 2, 0 };

	if(FAILED(pDispatch->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_METHOD, &Params3, &result, NULL, NULL)))
		cout << "pDispatch->Invoke() failed" << endl;

	cout << "Default + " << SumArgsOpt[1].lVal << " = " << result.lVal << endl;

	// Using named optional arguments
	VARIANTARG SumArg;
	VariantInit(&SumArg);
	SumArg.vt = VT_I4;
	SumArg.lVal = 5;
	DISPID DispId = 1; // The y parameter
	DISPPARAMS Params4 = { &SumArg, &DispId, 1, 1 };

	if(FAILED(pDispatch->Invoke(dispid, IID_NULL, GetUserDefaultLCID(), DISPATCH_METHOD, &Params4, &result, NULL, NULL)))
		cout << "pDispatch->Invoke() failed" << endl;

	cout << "Default + " << SumArg.lVal << " = " << result.lVal << endl;

	pDispatch->Release();

	cout << "Client: Calling CoUninitialize()" << endl;
	CoUninitialize();
}