How to make the interface pointer global?

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This is C# DLL code.

C#

// Class1.cs
// A simple managed DLL that contains a method to add two numbers.
using System;

namespace ManagedDLL
{
	// Interface declaration.
    public interface ICalculator
    {
        int Add(int Number1, int Number2);
    };

    // Interface implementation.
	public class ManagedClass:ICalculator
	{
       public int Add(int Number1,int Number2)
            {
                return Number1+Number2;
            }
	}
}

This is the client code

C++

// CPPClient.cpp: Defines the entry point for the console application.
// C++ client that calls a managed DLL.

#include "stdafx.h"
#include "tchar.h"
// Import the type library.

#import "..\ManagedDLL\bin\Debug\ManagedDLL.tlb" raw_interfaces_only
using namespace ManagedDLL;
int _tmain(int argc, _TCHAR* argv[])
{
    // Initialize COM.
    HRESULT hr = CoInitialize(NULL);

    // Create the interface pointer.
    ICalculatorPtr pICalc(__uuidof(ManagedClass));

    long lResult = 0;

    // Call the Add method.
    pICalc->Add(5, 10, &lResult);

    wprintf(L"The result is %d\n", lResult);


    // Uninitialize COM.
    CoUninitialize();
    return 0;
}

Problem is how to make interface pointer "pICalc" Global.

Posted 14-Oct-12 22:35pm

Tarun Batra

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Marius Bancila · Accepted Answer · 2012-10-14T23:09:00

It's pretty straight forward:

C++

#include "stdafx.h"
#include "tchar.h"
// Import the type library.

#import "..\ManagedDLL\bin\Debug\ManagedDLL.tlb" raw_interfaces_only
using namespace ManagedDLL;

ICalculatorPtr pICalc = NULL;

int _tmain(int argc, _TCHAR* argv[])
{
    // Initialize COM.
    HRESULT hr = CoInitialize(NULL);
 
    // Create the interface pointer.
    pICalc = ICalculatorPtr(__uuidof(ManagedClass));
 
    long lResult = 0;
 
    // Call the Add method.
    pICalc->Add(5, 10, &lResult);
 
    wprintf(L"The result is %d\n", lResult);
 

    // Uninitialize COM.
    CoUninitialize();
    return 0;
}

(BTW, I suppose this is just a sample, because your managed DLL needs some attributes on the interfaces, classes and methods and must be ComVisible.)