HTTP GET的三种方式

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一.第一种方式(包装类的方式)

a.在VC++添加类，选择typelib

b.选择文件:C:\Windows\System32\winhttp.dll

选择到右边生成的类，最后点完成，即产生了一个CWinhttpRequest类

------剩余具体步骤-----------------------------------------

//1.初始化COM组件
//2.创建组件对象指针
//3.实例化
//----------
//4.open(pHttpReq->Open(_T("GET"),_T("http://pan.baidu.com"

),Async);)
//5.send(pHttpReq->Send(vtMissing);)
//6.Response(pHttpReq->get_ResponseText())
//----------
//7.释放实例化
//8.删除对象指针
//9.卸载COM组件

//初始化COM组件::CoInitialize(nullptr);CWinHttpRequest *pHttpReq = new CWinHttpRequest();BOOL bret = pHttpReq->CreateDispatch(_T("WinHttp.WinHttpRequest.5.1")/*__uuidof(WinHttpRequest)*/);if (!bret){return ;}COleVariant asyn =  VARIANT_FALSE;pHttpReq->Open(_T("GET"),_T("http://pan.baidu.com"),asyn);pHttpReq->Send(vtMissing);CString str = pHttpReq->get_ResponseText();MessageBox(str);pHttpReq->ReleaseDispatch();delete pHttpReq;::CoUninitialize();

二.第二种方式( import+接口方式)

接口:IWinHttpRequest

#import "C:\\Windows\\System32\\winhttp.dll"

::CoInitialize(nullptr);IWinHttpRequest *pHttpReq = nullptr;HRESULT hr = CoCreateInstance(__uuidof(WinHttpRequest),nullptr,CLSCTX_ALL,__uuidof(IWinHttpRequest),(LPVOID*)&pHttpReq);if (FAILED(hr)){::CoUninitialize();return ;}hr = pHttpReq->Open(_T("GET"),_T("https://mail.qq.com/cgi-bin/loginpage"));if (FAILED(hr)){pHttpReq->Release();::CoUninitialize();return ;}hr = pHttpReq->Send();if (FAILED(hr)){pHttpReq->Release();::CoUninitialize();return ;}CString strText = pHttpReq->ResponseText;MessageBox(strText);pHttpReq->Release();::CoUninitialize();

三.第三种方式( import+智能指针包装类的方式)

::CoInitialize(nullptr);IWinHttpRequestPtr  pHttpReq = nullptr;HRESULT hr = pHttpReq.CreateInstance(__uuidof(WinHttpRequest));if (FAILED(hr)){::CoUninitialize();return ;}hr = pHttpReq->Open(_T("GET"),_T("https://mail.qq.com/cgi-bin/loginpage"));if (FAILED(hr)){//pHttpReq.Release();::CoUninitialize();return ;}hr = pHttpReq->Send();if (FAILED(hr)){//pHttpReq.Release();::CoUninitialize();return ;}CString strText = pHttpReq->ResponseText;MessageBox(strText);//pHttpReq.Release();::CoUninitialize();}

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