C++、c#互调用之VC6 调用 VC6 COM

1、vc6 编写com

使用VC6.0建立COM组件,工程类型:ATL COM AppWizard

程序代码:

接口:

interface IAdd : IDispatch

        {

                [id(1), helpstring("method iadd")] HRESULT iadd([in]int a, [in]int b, [out]int * c);

                [id(2), helpstring("method fadd")] HRESULT fadd([in]float a, [in]float b, [out]float * c);

                [id(3), helpstring("method isub")] HRESULT isub([in]int a, [in]int b, [out]int * c);

        };


实现:

STDMETHODIMP CAdd::iadd(int a, int b, int *c)

{

        // TODO: Add your implementation code here

        *c = a + b;



        return S_OK;

}



STDMETHODIMP CAdd::fadd(float a, float b, float *c)

{

        // TODO: Add your implementation code here

        *c = a + b;



        return S_OK;

}



STDMETHODIMP CAdd::isub(int a, int b, int *c)

{

        // TODO: Add your implementation code here

        *c = a - b;



        return S_OK;

}


2、VC6.0编写调用程序

使用VC6.0建立MFC应用程序UseCOM,调用刚刚建立的COM组件

将上面程序AddCom生成的AddCom.dll放入本程序的工程目录和程序生成目录中

在StdAfx.h中加入:

#import "AddCom.dll" no_namespace

程序代码:

void CUseComDlg::OnBUTTONUse() 

{

        // TODO: Add your control notification handler code here

        CString strResult;

        CoInitialize(NULL);//NULL换成0也可以

        IAddPtr m_add = NULL;

        HRESULT hr = S_OK;

        hr = m_add.CreateInstance(__uuidof(Add));



        int d_a = 90;

        int d_b = 10;

        int d_c;

        int d_d;

        float f_a = 1;

        float f_b = 2;

        float f_c;

 

        m_add->_IAdd(d_a,d_b,&d_c);

        m_add->fadd(f_a,f_b,&f_c);

        m_add->isub(d_a,d_b,&d_d);



        strResult.Format("返回结果:%d; %f; %d",d_c,f_c,d_d);

        MessageBox(strResult,"结果",MB_OK);



        m_add.Release();

        m_add = NULL;

        CoUninitialize();

}

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