(1)新建一个MFC对话框项目

(2)对话框中添加WebBrower控件，添加方法：点击菜单栏工具->选择工具箱项->在弹出的选择工具箱项对话框选择COM组件->Microsoft Web Browser->确定，添加到对话框中即可。

(3)将CWebBrowser2.h和CWebBrowser2.cpp添加到项目中，XXXdlg.h中包含头文件

#include "CWebbrowser2.h"，定义变量CWebBrowser2 m_web;

(4)XXXdlg.cpp的DoDataExchange中添加将控件与变量动态绑定

DDX_Control(pDX, IDC_EXPLORER1, m_web);

(5)XXXdlg.cpp的初始化函数中添加

VARIANT vt;

COleVariant vaUrl=_T("http://www.baidu.com");

m_web.Navigate2(vaUrl,&vt,&vt,&vt,&vt);

运行程序，可以看到自动加载百度页面。

(6)XXXdlg.h中添加一下声明，用于当页面加载完成后进一步操作页面

DECLARE_EVENTSINK_MAP()

void DocumentCompleteExplorer(LPDISPATCH pDisp, VARIANT* URL);

(7)XXXdlg.cpp中添加

BEGIN_EVENTSINK_MAP(CbaiduDlg, CDialogEx)

ON_EVENT(CbaiduDlg, IDC_EXPLORER1, 259, CbaiduDlg::DocumentCompleteExplorer, VTS_DISPATCH VTS_PVARIANT)

END_EVENTSINK_MAP()

(8)实现DocumentCompleteExplorer

分析百度源码可以得到输入框的id是kw1，按钮的id是su1。

<span style="font-size:18px;">void CbaiduDlg::DocumentCompleteExplorer(LPDISPATCH pDisp, VARIANT* URL)
{
	HRESULT   hr;
	LPUNKNOWN lpUnknown;
	LPUNKNOWN lpUnknownWB = NULL;
	LPUNKNOWN lpUnknownDC = NULL;
	IHTMLElementCollection *objAllElement=NULL;
	IHTMLDocument2 *objDocument=NULL;
	CString strUrl,strTemp;

	lpUnknown = m_web.GetControlUnknown();
	ASSERT(lpUnknown);

	if (lpUnknown)
	{
		hr = lpUnknown->QueryInterface(IID_IUnknown,(LPVOID*)&lpUnknownWB);
		ASSERT(SUCCEEDED(hr));
		if (FAILED(hr))
			return;

		hr = pDisp->QueryInterface(IID_IUnknown, (LPVOID*)&lpUnknownDC);
		ASSERT(SUCCEEDED(hr));
		if (SUCCEEDED(hr) && lpUnknownWB == lpUnknownDC)
		{
			// The document has finished loading.
			strUrl=m_web.get_LocationURL();
			if (strUrl.IsEmpty())
			{
				return ;
			}
			objDocument=(IHTMLDocument2*)m_web.get_Document();
			objDocument->get_all(&objAllElement);
			if (strUrl==_T("http://www.baidu.com/"))
			{	
				CComPtr<IDispatch>pDisp;
				objAllElement->item(COleVariant(_T("kw1")),COleVariant((long)0),&pDisp); 
				CComQIPtr<IHTMLElement, &IID_IHTMLElement>pElement;
				if(pDisp==NULL)
				{
					return;
				}
				else
				{
					pElement=pDisp;
					pElement->put_innerText(_T("测试")); //填充表单
				}
				
				VARIANT   name; 
				CComBSTR   tag; 
				long     index; 
				objAllElement-> get_length(&index); 
				name.vt=VT_I4;
				for(long i=0; i <index; i++)//遍历所有元素，通过id属性获取值
				{ 
					name.lVal   =   i;
					IDispatch   *   pDispatch=NULL; 
					objAllElement-> item(name,name,&pDispatch); 
					IHTMLElement*   spElement; 
					pDispatch-> QueryInterface(IID_IHTMLElement,   (void**)&spElement); 
					BSTR   tag; 
					spElement->get_id(&tag); 
					CString   ss(tag); 
					if(ss == "su1") 
						spElement->click();
					
					spElement->Release();
				}
			}
		}
	}	

	if (lpUnknownWB)
		lpUnknownWB->Release();

	if (lpUnknownDC)
		lpUnknownDC->Release();
}</span>

运行可以看到百度自动搜索