• 编写一个简单的COM组件


    参考网站:编写一个简单的COM组件_a ray of sunshine-CSDN博客

    (1) 用MIDL编写.idl文件

    //将以下代码保存成 IXIYIZ.idl 文件

    //在命令行上进行编译,编译命令:

    //midl IXIYIZ.idl

    //生成 IXIYIZ.h ,dlldata.c, IXIYIZ.h, IXIYIZ_p.c

    //其中 IXIYIZ.h,IXIYIZ.h 文件是我们目前所需要的

    import "unknwn.idl";
    [

    object,

    uuid(7F67119B-1E09-4d4f-B472-2106CCAE3275)

    ]


    interface IX: IUnknown

    {

    [local]

    void __stdcall Fx();

    };


    [

    object,

    uuid(A667947B-714A-4bde-B2DD-C090928D62FF)

    ]

    interface IY: IUnknown

    {

    [local]

    void __stdcall Fy();

    };

    [

    object,

    uuid(AA80F229-0809-4c69-B8AA-BB6F58DBC304)

    ]

    interface IZ: IUnknown

    {

    [local]

    void __stdcall Fz();

    };
     

    (2) 编写组件类的头文件

    // 将以下代码保存成 CA.h

    // 注意将(1)中生成的 IXIYIZ.h 头文件包含进来

    #include<iostream>

    #include"IXIYIZ.h"

    using namespace std;

    class CA : public IX, public IY

    {

    HRESULT __stdcall QueryInterface(const IID& iid, void ** ppv);

    ULONG __stdcall AddRef(){return 0;}

    ULONG __stdcall Release(){return 0;}



    void __stdcall Fx(){cout<<"Fx"<<endl;}

    void __stdcall Fy(){cout<<"Fy"<<endl;}

    };

    extern "C" __declspec(dllexport) IUnknown* __cdecl CreateInstance();
     

    (3) 编写组件类的实现文件

    //将以下代码保存成 CA.cpp

    //3.1编译 IXIYIZ_i.c,编译命令:

    //cl /c IXIYIZ_i.c 生成 IXIYIZ_i.obj 文件

    //3.2编译 CA.h 文件,编译命令:

    //cl /c /GX CA.cpp 生成 CA.obj 文件

    //3.3链接上面两个文件,生成组件DLL,编译命令:

    //link /dll CA.obj IXIYIZ_i.obj 生成 CA.lib 和 CA.dll

    //3.4将 IXIYIZ_i.obj 整合到 CA.lib 文件中,命令:

    // lib CA.lib IXIYIZ_i.obj

    #include"CA.h"

    HRESULT __stdcall CA::QueryInterface(const IID& iid, void ** ppv)

    {

    if(iid == IID_IUnknown)

    {

    cout<<"QueryInterface:Return pointer to IUnknown."<<endl;

    *ppv = static_cast<IX *>(this);

    }

    else if(iid == IID_IX)

    {

    cout<<"QueryInterface:Return pointer to IX."<<endl;

    *ppv = static_cast<IX *>(this);

    }

    else if(iid == IID_IY)

    {

    cout<<"QueryInterface:Return pointer to IY."<<endl;

    *ppv = static_cast<IY *>(this);

    }

    else

    {

    cout<<"QueryInterface:Interface not supported."<<endl;

    *ppv = NULL;

    return E_NOINTERFACE;

    }

    reinterpret_cast<IUnknown*>(*ppv)->AddRef();

    return S_OK;

    }

    extern "C" __declspec(dllexport) IUnknown* __cdecl CreateInstance()

    {

    IUnknown *pI = static_cast<IX*>(new CA);

    pI->AddRef();

    return pI;

    }

    (4) 编写客户端,对(3)生成的组件(CA.dll)进行测试

    //将以下代码保存成 client.cpp 文件

    //4.1编译客户端,编译命令:

    //cl /c /GX client.cpp 生成 client.obj 文件

    //4.2链接客户端与组件,命令:

    //link client.obj CA.lib

    #include<iostream>

    #include<unknwn.h>

    #include"IXIYIZ.h"

    using namespace std;

    extern "C" __declspec(dllexport) IUnknown* __cdecl CreateInstance();

    int main()

    {

    HRESULT hr;

    cout<<"Client: Get an IUnknown pointer."<<endl;

    IUnknown* pI = CreateInstance();

    cout<<"Client: Get Interface IX."<<endl;

    IX *pIX = NULL;

    hr = pI->QueryInterface(IID_IX, reinterpret_cast<void **>(&pIX));

    if(SUCCEEDED(hr))

    {

    cout<<"Client: Succeeded getting IX."<<endl;

    pIX->Fx();

    }

    return 0;

    }
    ————————————————
    版权声明:本文为CSDN博主「a-ray-of-sunshine」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。
    原文链接:https://blog.csdn.net/a_ray_of_sunshine/article/details/12683699

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  • 原文地址:https://www.cnblogs.com/bruce1992/p/14888119.html
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