• COM技术开发(一)


    COM :基本的接口(IX,IY), 组件的实现(CA),以及对组件的调用

    #include "pch.h"
    #include <iostream>
    
    #include <objbase.h>
    
    using namespace std;
    
    void trace(const char* msg) { cout << msg << endl; }
    
    //Interfaces start
    interface IX :IUnknown
    {
            virtual void __stdcall Fx() = 0;
        };
    
    interface IY :IUnknown
    {
            virtual void __stdcall Fy() = 0;
        };
    
    interface IZ :IUnknown
    {
            virtual void __stdcall Fz() = 0;
        };
    
    //Forward references for GUIDs
    extern const IID IID_IX;
    extern const IID IID_IY;
    extern const IID IID_IZ;
    //Interface end
    
    
    
    //component start
    class CA :public IX, public IY
    {
            LONG m_cRef;
            virtual HRESULT __stdcall QueryInterface(const IID& iid, void** ppv);
            virtual ULONG __stdcall AddRef();
            virtual ULONG __stdcall Release();
        
                virtual void __stdcall Fx() { cout << "Fx function" << endl; }
            virtual void __stdcall Fy() { cout << "Fy function" << endl; }
    public:
            CA();
            ~CA() { trace("CA: Destory Self"); }
        };
    
    
    CA::CA()
    {
            trace("CA: Constrator Self");
            m_cRef = 0;
        }
    
    HRESULT __stdcall CA::QueryInterface(const IID &iid, void **ppv)
    {
            if (iid == IID_IUnknown)
                {
                    trace("QueryInterface:Return pointer to IUnknown");
             * ppv = static_cast<IX*>(this);
                }
            else if (iid == IID_IX)
                {
                    trace("QueryInterface:Return pointer to IX");
             * ppv = static_cast<IX*>(this);
                }
            else if (iid == IID_IY)
                {
                    trace("QueryInterface:Return pointer to IX");
             * ppv = static_cast<IY*>(this);
                }
            else
                {
                    trace("QueryInteface Interface not supported");
             * ppv = NULL;
                    return E_NOINTERFACE;
                }
            reinterpret_cast<IUnknown*>(*ppv)->AddRef();
            return S_OK;
        }
    
    ULONG __stdcall CA::AddRef()
    {
            InterlockedIncrement(&m_cRef);
            cout << "CA AddRef -- Ref:" << m_cRef << endl;
            return m_cRef;
        }
    
    ULONG __stdcall CA::Release()
    {
        
                if (InterlockedDecrement(&m_cRef) == 0)
                {
                    delete this;
                    return 0;
                }
            cout << "CA ReleaseRef -- Ref:" << m_cRef << endl;
            return m_cRef;
        }
    
    IUnknown* CreateInstance()
    {
            IUnknown* pI = static_cast<IX*>(new CA);
            pI->AddRef();
            return pI;
        }
    
    // {05464095-EC3A-45b3-8E0C-D1793FBDF13D}
    static const IID IID_IX =
    { 0x5464095, 0xec3a, 0x45b3, { 0x8e, 0xc, 0xd1, 0x79, 0x3f, 0xbd, 0xf1, 0x3d } };
    
    //  {39696224-3AE3-4b46-B056-99359CAC6CA9}
    static const IID IID_IY =
    { 0x39696224, 0x3ae3, 0x4b46, { 0xb0, 0x56, 0x99, 0x35, 0x9c, 0xac, 0x6c, 0xa9 } };
    
    // {6684A06D-64B8-46f3-9988-CDC119E18165}
    static const IID IID_IZ =
    { 0x6684a06d, 0x64b8, 0x46f3, { 0x99, 0x88, 0xcd, 0xc1, 0x19, 0xe1, 0x81, 0x65 } };
    //component end
    
    
    
    //client start
    int main(int argc, char* argv[])
    {
            HRESULT hr;
            trace("Client:  Get an IUnknown pointer");
            IUnknown* pIUnknown = CreateInstance();
            IX* pIx = NULL;
            trace("Client: Get Interface IX");
            hr = pIUnknown->QueryInterface(IID_IX, (void**)&pIx);
            if (SUCCEEDED(hr))
                {
                    trace("Client: Succeed Get Interface IX");
                    pIx->Fx();
                }
        
                IY* pIY = NULL;
            hr = pIUnknown->QueryInterface(IID_IY, (void**)&pIY);
            pIUnknown->Release();
            if (SUCCEEDED(hr))
                {
                    trace("Client: Succeed GetInterface IY");
                    pIY->Fy();
                    pIY->Release();
                }
        
                //Query IY from IX
                IY* pIYfromIX = NULL;
            hr = pIx->QueryInterface(IID_IY, (void**)&pIYfromIX);
            if (SUCCEEDED(hr))
                {
                    trace("Client: Succeed GetInterfae IY from pIX");
                    pIYfromIX->Fy();
                    pIYfromIX->Release();
                }
            pIx->Release();
            //delete component
            //    delete pIUnknown;
                return 0;
        }
    //client end

    参考资料:

    1、COM程序的简单实现(COM技术内幕笔记之一)

    2、COM组件开发(一)—— 对象与接口

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  • 原文地址:https://www.cnblogs.com/2018shawn/p/10853975.html
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