获取对话框中的控件指针

1. 采用GetDlgControl获取控件指针;

 //以IE控件为例
 CComPtr<IWebBrowser2> spIWebBrowser2;

 GetDlgControl(IDC_EXPLORER,IID_IWebBrowser2,(void **)&spIWebBrowser2);

2. 通过AtlAxGetControl获取控件指针;

 //GetDlgControl函数封装了以下实现
 HWND hWnd;
 HRESULT hr;
 CComPtr<IUnknown> spUnk;
 CComPtr<IWebBrowser2> spWebBrowser2;
 hWnd = GetDlgItem(IDC_EXPLORER);
 if (hWnd != NULL){
   hr = AtlAxGetControl(hWnd, &spUnk);
   if (SUCCEEDED(hr))
   {
     hr = spUnk ->QueryInterface(IID_IWebBrowser2, (void **)&m_spWebBrowser2);
   }
 }

 3. 以上均为ATL工程, 下面介绍MFC下的获取

 CComPtr<IWebBrowser2> m_spWebBrowser2;
 {
 //直接创建IWebBrowser2接口
 CoInitialize(NULL);
 //CLSID_WebBrowser, 是微软web预览控件的实现类的id,它同过属性Parent来得到窗口句柄,因为控件没法知道它被放在哪个容器里,所以不会实现HWND属性!
 CoCreateInstance(CLSID_WebBrowser, NULL, CLSCTX_INPROC, IID_IWebBrowser2, (void**)&m_spWebBrowser2);
 //CLSID_InternetExplorer,是微软ie浏览器自动化实现类的id,它通过属性HWND得到!因为得到句柄一定封装好了
 CoCreateInstance(CLSID_InternetExplorer,
 NULL,CLSCTX_INPROC,IID_IWebBrowser2,(void**)&m_pWebBrowser2);
 }
 //MFC下插入Web Browser控件, 获取IWebBrowser
 int GetDlgIEControl(int nID)
 {
     if (m_spWebBrowser2 == NULL){
         CWnd *pCWnd = GetDlgItem(IDC_EXPLORER);
         if (pCWnd != NULL){
             HRESULT hr;
             CComPtr<IUnknown> spUnk;
             spUnk = NULL;
             //using atl
             //hr = AtlAxGetControl(pCWnd->GetSafeHwnd(), &spUnk);
             spUnk = pCWnd ->GetControlUnknown();
             if (spUnk != NULL)
             {
                 hr = spUnk ->QueryInterface(IID_IWebBrowser2, (void **)&m_spWebBrowser2);
                 return 1;
             }
         }
     }
     return 0;
 }