COM组件双接口对象模型

模型如下：

这里COM对象一共实现了三个接口，IUnknown,IDispatch, Ixxx. 每个COM都必须实现IUnknown，不考虑在内的话共实现了IDispatch和自定义接口Ixxx两个，故称双接口对象。

IDispatch主要是给解释型语言脚本用的，因为脚本没办法直接调用多态的接口函数。

 #include <iostream>
 using namespace std;

 class  IUnknown
 {
 public:
     virtual long  QueryInterface(  long riid, void * * ppvObject) = ;
     virtual long  AddRef( void) = ;
     virtual long  Release( void) = ;
 };

 class  IDispatch :  public IUnknown
 {
 public:
     virtual void GetTypeInfoCount() = ;
     virtual void GetTypeInfo() = ;
     virtual void GetIDsOfNames() = ;
     virtual void Invoke() = ;
 };

 class  IMyDualTest :  public IDispatch
 {
 public:
     virtual long Add(long n1, long n2, long* pVal) = ;
 };

 class CMyDualTest: public IMyDualTest
 {
 public:
     CMyDualTest():a(){}
     // IUnknown
     long  QueryInterface(  long riid, void * * ppvObject) { cout<<"QueryInterface"<<endl; return ;}
     long  AddRef( void) { cout<<"AddRef"<<endl; return ;}
     long  Release( void) { cout<<"Release"<<endl; return ;}

     // IDispatch
     virtual void GetTypeInfoCount(){ cout<<"GetTypeInfoCount"<<endl;}
     virtual void GetTypeInfo() { cout<<"GetTypeInfo"<<endl;}
     virtual void GetIDsOfNames() { cout<<"GetIDsOfNames"<<endl;}
     virtual void Invoke() { cout<<"Invoke"<<endl;}

     // IMyDualTest
     long Add(long n1, long n2, long* pVal) { cout<<"Add"<<endl; return ;}

 private:
     int a;
 };

 //typedef long  (*QueryInterfaceType)(  long riid, void * * ppvObject);
 typedef long  (*AddRefType)( void);
 //typedef long  (*ReleaseType)( void);
 //
 //typedef long  (CMyTest::*QueryInterfaceClassType)(  long riid, void * * ppvObject);

 void main()
 {
     CMyDualTest * pTest = new CMyDualTest;

     int * pFirst = (int*)(*(int*)pTest);

     for(int i=; i<; i++)
     {
         ((AddRefType)(*(pFirst+i)))();
     }
 }

执行结果：

参考文章：

COM 组件设计与应用（八）——实现多接口    http://www.vckbase.com/index.php/wv/1236