vc++post方式登錄網站

以http://www.idc3389.com為例:

效果圖:

 

 

使用Fiddler工具進行抓包，截圖:

 

 

可以發現:

1.並沒有使用cookie並沒有用作用戶身份識別，因為登錄前后的cookie並沒有發生改變

如果使用cookie用於用戶身份認證，則登錄前后cookie肯定不同，以博客園為例:

2.Connection始終保持為keep-alive。也就是說客戶端和服務器只建立了一次連接，后續的請求都是在當前連接的基礎上，並沒有重新新建連接。

 

代碼:

 向CHttpLoginTestDlg.h中的class CHttpLoginTestDlg 中加入

private:
    // 獲取一段字符串,通過它的左右字符串為參考
    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("用戶名或密碼不能為空"), _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;
    
    // 設置相當關鍵 post提交數據時必須要
    hr = pHttpReq->SetRequestHeader(_T("Content-Type"), _T("application/x-www-form-urlencoded"));
    if (FAILED(hr))
        return;

    // 拼接post表單數據
    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;

    // 獲得響應，
    _variant_t varRspBody = pHttpReq->GetResponseBody();
    //ULONG dataLen = varRspBody.parray->rgsabound[0].cElements; // 文本長度
    char *pContentBuffer = (char*)varRspBody.parray->pvData;
    CString rspStr;
    rspStr = pContentBuffer;
    if (rspStr.Find(_T("歡迎您：")) != -1)
    {
        MessageBox(_T("登錄成功"));
        bLogined = TRUE;
    }
        
    else
        MessageBox(_T("登錄失敗"));
}


void CHttpLoginTestDlg::OnBnClickedGetinfoButton()
{
    if (!bLogined)
    {
        MessageBox(_T("尚未登錄!請先登錄!"), _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;

    // 獲得響應，
    _variant_t varRspBody = pHttpReq->GetResponseBody();
    //ULONG dataLen = varRspBody.parray->rgsabound[0].cElements; // 文本長度
    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 = -1, posRight = -1;
    posLeft = str.Find(left);
    if (posLeft == -1) 
        return ret;
    
    posLeft += left.GetLength(); // 所求字符串的起始位置
    posRight = str.Find(right, posLeft); // 所求字符串的結束位置
    if (posRight == -1)
        return ret;
    ret = str.Mid(posLeft, posRight - posLeft);
    return ret;
    
}