vc++post方式登录网站

以http://www.idc3389.com为例:

效果图:

使用Fiddler工具进行抓包，截图:

可以发现:

1.并没有使用cookie并没有用作用户身份识别，因为登录前后的cookie并没有发生改变

如果使用cookie用于用户身份认证，则登录前后cookie肯定不同，以博客园为例:

2.Connection始终保持为keep-alive。也就是说客户端和服务器只建立了一次连接，后续的请求都是在当前连接的基础上，并没有重新新建连接。

代码:

向CHttpLoginTestDlg.h中的class CHttpLoginTestDlg 中加入

private:
    // 获取一段字符串,通过它的左右字符串为参考
    CString getMidStrByLeftAndRight(const CString &str, const CString &left, const CString &right);
private:
    IWinHttpRequestPtr pHttpReq;
    BOOL bLogined; 

CHttpLoginTestDlg.cpp:

CHttpLoginTestDlg::CHttpLoginTestDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CHttpLoginTestDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
    pHttpReq = NULL;
    bLogined = FALSE;
}

#import "C:\\Windows\\system32\\winhttp.dll" no_namespace

void CHttpLoginTestDlg::OnBnClickedLoginButton()
{
    CString username, passwd;
    GetDlgItemText(IDC_EDIT_USER, username);
    GetDlgItemText(IDC_EDIT_PASSWORD, passwd);
    if (username.IsEmpty() || passwd.IsEmpty())
    {
        MessageBox(_T("用户名或密码不能为空"), _T("提示"));
        return;
    }

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

    hr = pHttpReq->Open(_T("POST"), _T("http://www.idc3389.com/user/userlogin.asp"));
    if (FAILED(hr))
        return;

    // 设置相当关键 post提交数据时必须要
    hr = pHttpReq->SetRequestHeader(_T("Content-Type"), _T("application/x-www-form-urlencoded"));
    if (FAILED(hr))
        return;

    // 拼接post表单数据
    CString strBody;
    strBody.Format(_T("username=%s&password=%s&x=12&y=10"),username, passwd);
    COleVariant varBody = strBody;
    hr = pHttpReq->Send(varBody);
    if (FAILED(hr))
        return;

    // 获得响应，
    _variant_t varRspBody = pHttpReq->GetResponseBody();
    //ULONG dataLen = varRspBody.parray->rgsabound[0].cElements; // 文本长度
    char *pContentBuffer = (char*)varRspBody.parray->pvData;
    CString rspStr;
    rspStr = pContentBuffer;
    if (rspStr.Find(_T("欢迎您：")) != -)
    {
        MessageBox(_T("登录成功"));
        bLogined = TRUE;
    }

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

void CHttpLoginTestDlg::OnBnClickedGetinfoButton()
{
    if (!bLogined)
    {
        MessageBox(_T("尚未登录!请先登录!"), _T("提示"));
        return;
    }

    HRESULT hr = pHttpReq->Open(_T("GET"), _T("http://www.idc3389.com/user/modify.asp"));
    if (FAILED(hr))
        return;
    hr = pHttpReq->Send();
    if (FAILED(hr))
        return;

    // 获得响应，
    _variant_t varRspBody = pHttpReq->GetResponseBody();
    //ULONG dataLen = varRspBody.parray->rgsabound[0].cElements; // 文本长度
    char *pContentBuffer = (char*)varRspBody.parray->pvData;
    CString rspStr;
    rspStr = pContentBuffer;
    //MessageBox(rspStr);

    CString username = getMidStrByLeftAndRight(rspStr, _T("id=\"truename\" value=\""), _T("\""));
    CString email = getMidStrByLeftAndRight(rspStr, _T("id=\"email\" value=\""), _T("\""));
    CString addr = getMidStrByLeftAndRight(rspStr, _T("id=\"address\" value=\""), _T("\""));
    CString tel = getMidStrByLeftAndRight(rspStr, _T("id=\"tel\" value=\""), _T("\""));
    SetDlgItemText(IDC_STATIC_NAME, username);
    SetDlgItemText(IDC_STATIC_ADDR, addr);
    SetDlgItemText(IDC_STATIC_EMAIL, email);
    SetDlgItemText(IDC_STATIC_TEL, tel);

}

CString CHttpLoginTestDlg::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;

}