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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:

  技术分享

 

  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:

  技术分享

 

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VC++ : VS2008 使用ATL开发COM组件