vc++使用cookie登录网站

以http://www.idc816.com为例

效果图:

1）先登录获取cookie,再使用cookie获取用户信息

2)记录cookie,关闭程序后重新运行程序，直接获取用户信息

使用Fiddler抓包分析:

由于IWinHttpRequest对象会自动处理302跳转，但是服务器返回的cookie（Set-Cookie）正好在响应头中，因此需要设置取消IWinHttpRequest的自动重定向功能

通过put_option函数进行设置WinHttpRequestOption_EnableRedirects项为VARIANT_FALSE

此外,默认情况下WinHttpRequest会自动将服务器返回的 Set-Cookie信息设置到当前WinHttpRequest对象的Header上面，下次当访问相同域的网址时会自动带上对应的Cookie

代码:

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

#define GET_WINHTTP_RESPONSE_STRING(IWinHttpRequestPtr_Obj, CString_Obj) \
{\
_variant_t varRspBody = IWinHttpRequestPtr_Obj->ResponseBody; \
char *pContentBuffer = (char*)varRspBody.parray->pvData; \
CString_Obj = pContentBuffer; \
}

CString Get_Recv_Cookie(const CString &respHeader)
{
    CString cookie;
    CString key = _T("Set-Cookie:");
    int iBegin = , iEnd = ;
    while (iBegin < respHeader.GetLength())
    {
        iBegin = respHeader.Find(key, iBegin);
        if (iBegin >= ) // 找到
        {
            iEnd = respHeader.Find(_T("\r\n"), iBegin);
            if (iEnd >= )
            {
                cookie += respHeader.Mid(iBegin, iEnd - iBegin + ); // 包括换行
                iBegin = iEnd;
            }
        }
        else {
            break;
        }
    }
    return cookie;
}

// 登录
void CHttpLoginWithCookieTestDlg::OnBnClickedButtonLogin()
{
    // 获取用户名,密码
    CString username, passwd;
    GetDlgItemText(IDC_EDIT_NAME, username);
    GetDlgItemText(IDC_EDIT_PASSWD, passwd);
    if (username.IsEmpty() || passwd.IsEmpty())
    {
        MessageBox(_T("用户名或者密码为空"));
        return;
    }

    IWinHttpRequestPtr pHttpReq = NULL;
    HRESULT hr = pHttpReq.CreateInstance(__uuidof(WinHttpRequest));
    if (FAILED(hr))
        return;

    // 建立连接
    hr = pHttpReq->Open(_T("POST"), _T("http://www.idc816.com/chklogin.asp"));
    if (FAILED(hr))
        return;

    // post数据此项必须设置
    pHttpReq->SetRequestHeader(_T("Content-Type"), _T("application/x-www-form-urlencoded"));

    // 取消自动处理302重定向,是为了获取响应头中的Set-Cookie
    COleVariant varRedirect = VARIANT_FALSE;
    pHttpReq->put_Option(WinHttpRequestOption_EnableRedirects, varRedirect);
　　// pHttpReq->Option[WinHttpRequestOption_EnableRedirects] = VARIANT_FALSE; 

    CString body;
    body.Format(_T("u_name=%s&u_password=%s&imageField.x=29&imageField.y=9"), username, passwd);
    COleVariant varBody = body;
    hr = pHttpReq->Send(varBody);
    if (FAILED(hr))
        return;

    CString respStr;
    GET_WINHTTP_RESPONSE_STRING(pHttpReq, respStr);

    long statusCode = pHttpReq->Status;
    if (statusCode ==  && respStr.Find(_T("/Manager/")) != -)
    {
        // 获取响应头
        CString respHeader = pHttpReq->GetAllResponseHeaders();
        // 获取cookie
        CString cookie = Get_Recv_Cookie(respHeader);
        // 显示cookie， 需要将输入框的Multiline属性设为True
        SetDlgItemText(IDC_EDIT_COOKIE_RECV, cookie);

        MessageBox(_T("登录成功"));

    }
    else
    {
        MessageBox(_T("登录失败"));
    }
}

// 获取信息
void CHttpLoginWithCookieTestDlg::OnBnClickedButtonInfo()
{
    IWinHttpRequestPtr pHttpReq = NULL;
    HRESULT hr = pHttpReq.CreateInstance(__uuidof(WinHttpRequest));
    if (FAILED(hr))
        return;

    hr = pHttpReq->Open(_T("GET"), _T("http://www.idc816.com/manager/usermanager/default2.asp"));
    if (FAILED(hr))
        return;

    // 从输入框中获取cookie
    CString cookie;
    GetDlgItemText(IDC_EDIT_COOKIE_SEND, cookie);
    // 设置cookie
    if (cookie.GetLength() > )
        pHttpReq->SetRequestHeader(_T("Cookie"), cookie.GetString());

    hr = pHttpReq->Send();
    if (FAILED(hr))
        return;

    CString respStr;
    GET_WINHTTP_RESPONSE_STRING(pHttpReq, respStr);

    CString company, tel, qq;
    company = getMidStrByLeftAndRight(respStr, _T("name=u_company  value=\""), _T("\""));
    tel = getMidStrByLeftAndRight(respStr, _T("name=u_telphone  value=\""), _T("\""));
    qq = getMidStrByLeftAndRight(respStr, _T("name=qq value=\""), _T("\""));
    SetDlgItemText(IDC_STATIC_COMPANY, company);
    SetDlgItemText(IDC_STATIC_TEL, tel);
    SetDlgItemText(IDC_STATIC_QQ, qq);
}

CString CHttpLoginWithCookieTestDlg::getMidStrByLeftAndRight(const CString &str, const CString &left, const CString &right)
{
    CString ret;
    int posLeft = -, posRight = -;
    posLeft = str.Find(left);
    if (posLeft == -)
        return ret;

    posLeft += left.GetLength(); // 所求字符串的起始位置
    posRight = str.Find(right, posLeft); // 所求字符串的结束位置
    if (posRight == -)
        return ret;
    ret = str.Mid(posLeft, posRight - posLeft);
    return ret;

}