VC++ : VS2008 使用ATL开发COM组件

　　新建ATL Project，工程名命名为MyAtlCom；

　　出现工程 向导，一路“Next”；

　　Add class，点击添加 ATL Simple Object , 类名CStatistic， 接口IStatistic，“Next”到底;

　　打开类视图，可以看到ATLCOM下新增了CStatistic类和IStatistic接口；

　　在ISample上右键，Add->Add Method （或Add Property...）来丰富接口了，然后在CStatistic内实现相应的的方法（属性）即可。

　　

　　增加一个Add方法:

　　STDMETHOD(Add)(LONG nNum1, LONG nNUm2, LONG* nRet);

　　STDMETHODIMP CStatistic::Add(LONG nNum1, LONG nNUm2, LONG* nRet) 
　　{ 
　　　　 // TODO: Add your implementation code here  *nRet = nNum1 + nNUm2;
 　　　　return S_OK; 
　　}

　　编译运行，生成MyAtlCom.dll，并注册到Windows中去。

　　下面，测试上述生成的COM组件MyAtlCom.dll

　　新建一个Win32控制台应用程序，取名MyAtlComTest　

#include "stdafx.h"
#include<iostream>
using namespace std;
#include "../MyAtlCom/MyAtlCom_i.h"
#include "../MyAtlCom/MyAtlCom_i.c"

int _tmain(int argc, _TCHAR* argv[])
{
    IStatistic * pIStatisticATL = NULL;
    HRESULT hr = CoInitialize(NULL); 　　　　//初始化COM

    //使用SUCCEEDED宏并检查我们是否能得到一个接口指针
    if(SUCCEEDED(hr))
    {
        hr = CoCreateInstance(CLSID_Statistic,
            NULL,
            CLSCTX_INPROC_SERVER,
            IID_IStatistic,
            (void **)&pIStatisticATL);
        //如果成功，则调用Add方法，否则显示相应的出错信息
        if(SUCCEEDED(hr))
        {
            LONG nReturnValue;
            pIStatisticATL->Add(8, 9, &nReturnValue);
            cout << "The Add result for 8 + 9 is " << nReturnValue << endl;
            pIStatisticATL->Release();
        }
        else
        {
            cout << "CoCreateInstance Failed." << endl;
        }
    }
    CoUninitialize();　　　　//释放COM
    return 0;
}

　　结果：

　　

　　或使用IDispath接口

#include "stdafx.h"  
  
#include <atlbase.h>  
#include <atlcom.h>  
#include <iostream>
using namespace std;
  
#include "../MyAtlCom/MyAtlCom_i.h"
#include "../MyAtlCom/MyAtlCom_i.c"

int _tmain(int argc, _TCHAR* argv[])  
{  
    CoInitializeEx(NULL, COINIT_MULTITHREADED);  
      
    CComPtr<IStatistic> spCar;  
    spCar.CoCreateInstance(CLSID_Statistic);
  
    // use IDispatch  
    DISPID PropertyID[1] = {0};  
    BSTR PropName[1];  
          
    PropName[0] = SysAllocString(L"Add");   
    HRESULT hr = spCar->GetIDsOfNames(IID_NULL, PropName, 1, LOCALE_SYSTEM_DEFAULT, PropertyID);  
  
    SysFreeString(PropName[0]);  
  
    CComVariant avarParams[3]; 
    avarParams[2].vt = VT_I4;  
    avarParams[2] = 8;  

    avarParams[1].vt = VT_I4;  
    avarParams[1] = 9;  
  
    LONG vTotal = 0;  
    avarParams[0].vt = VT_I4 | VT_BYREF;  
    avarParams[0] = &vTotal;  
  
    DISPPARAMS params = { avarParams,  
                        NULL,              // Dispatch identifiers of named arguments.   
                        3,                 // Number of arguments.  
                        0 };               // Number of named arguments.  
    CComVariant Result; 
    hr = spCar->Invoke(PropertyID[0], IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_METHOD, &params, &Result, NULL, NULL);  

    cout << "The Add function result is " << (int)(*params.rgvarg->plVal) << endl;
      
    spCar.Release();  
  
    CoUninitialize();  

　　 cin.get();
    return 0;
}

　　结果：

　　

 　　

　　使用COleDispatchDriver封装类

#include "stdafx.h"  

#include <atlbase.h>  
#include <atlcom.h>  
#include <iostream>
using namespace std;

#include "../MyAtlCom/MyAtlCom_i.h"
#include "../MyAtlCom/MyAtlCom_i.c"

int _tmain(int argc, _TCHAR* argv[])  
{  
    CoInitialize(NULL);  

    COleDispatchDriver disp;
    COleException *e = new COleException;

    try {
        // Create instance of MyAtlCom Control by using CLSID.
        if (disp.CreateDispatch(CLSID_Statistic, e))
        {
            static BYTE params[] = VTS_I4 VTS_I4 VTS_I4;
            LONG nNum1 = 4;
            LONG nNum2 = 5;
            LONG nAdd = 0;

            disp.InvokeHelper(0x01, 
                        DISPATCH_METHOD, 
                        VT_EMPTY,
                        NULL,
                        params,
                        nNum1, nNum2, &nAdd);            

            if (nAdd == nNum1 + nNum2)
                AfxMessageBox(_T("InvokerHelper successed!"));            
            else
            {
                CString cStr;
                cStr.Format(_T("InvokerHelper Failed! Error %d"), GetLastError());
                AfxMessageBox(cStr);
            }
        }
        else
            throw e;

    }

    //Catch control-specific exceptions.
    catch (COleDispatchException * e) 
    {
        CString cStr;

        if (!e->m_strSource.IsEmpty())
            cStr = e->m_strSource + " - ";
        if (!e->m_strDescription.IsEmpty())
            cStr += e->m_strDescription;
        else
            cStr += "unknown error";

        AfxMessageBox(cStr, MB_OK, 
            (e->m_strHelpFile.IsEmpty())? 0:e->m_dwHelpContext);

        e->Delete();
    }
    
    e->Delete();

    CoUninitialize();  

    cin.get();
    return 0;  
}  

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