Using CInternetFile open an Url

Here is code:

        // TODO: Add your control notification handler code here
    CInternetSession InetSession;
    CString strLine;
    CInternetFile *pInetFile = NULL;
    try
    {
        pInetFile = (CInternetFile *)InetSession.OpenURL(_T("https://account.cnblogs.com/signin?returnUrl=https%3A%2F%2Fwww.cnblogs.com%2F"));
    }
    catch (CInternetException *pException)
    {
        pInetFile = NULL;
        pException->Delete();
    }
    char sRecived[1024] = { 0 };
    if (pInetFile)
    {
        while (pInetFile->ReadString((LPTSTR)sRecived, 1024))
        {
            m_Edit2_context+=(CString)sRecived;
        }
        UpdateData(false);
    }    

there would be a bug which will get an unknown context from Url.

 Another way to get the Url sourse:

unsigned short nPort;        //用于保存目标HTTP服务端口
    CString strServer, strObject;    //strServer用于保存服务器地址，strObject用于保存文件对象名称
    DWORD dwServiceType;        //dwServiceType用于保存服务类型，dwRet用于保存提交GET请求返回的状态号
    UpdateData(true);
    setlocale(LC_CTYPE, "chs");
    //解析URL，获取信息
    if (!AfxParseURL(m_Edit1_link, dwServiceType, strServer, strObject, nPort))
    {
        return;
    }

    //建立网络连接
    if (1)
    {
        CInternetSession *session = new CInternetSession();
        CHttpFile *pHtFile = NULL;
        CHttpConnection *pHtCon = session->GetHttpConnection(strServer, nPort,"admin","12345");
        pHtFile = pHtCon->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject);
        pHtFile->SendRequest();
        if (pHtFile != false)
        {
            CString sRecived;
            while (pHtFile->ReadString(sRecived)!=NULL)
            {
                m_Edit2_context += sRecived;
            }
            UpdateData(false);
        }
        session->Close();
        delete pHtCon; pHtCon = NULL;
        delete pHtFile; pHtFile = NULL;
    }

Now we list the last way by using vc++ 

// m_WinInetDlg.cpp : implementation file
//

#include "stdafx.h"
#include "m_WinInet.h"
#include "m_WinInetDlg.h"
#include <afxinet.h>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
    CAboutDlg();

// Dialog Data
    //{{AFX_DATA(CAboutDlg)
    enum { IDD = IDD_ABOUTBOX };
    //}}AFX_DATA

    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CAboutDlg)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    //}}AFX_VIRTUAL

// Implementation
protected:
    //{{AFX_MSG(CAboutDlg)
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
    //{{AFX_DATA_INIT(CAboutDlg)
    //}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CAboutDlg)
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
    //{{AFX_MSG_MAP(CAboutDlg)
        // No message handlers
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CM_WinInetDlg dialog

CM_WinInetDlg::CM_WinInetDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CM_WinInetDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CM_WinInetDlg)
    m_Edit2 = _T("");
    m_Edit1 = _T("");
    //}}AFX_DATA_INIT
    // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CM_WinInetDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CM_WinInetDlg)
    DDX_Text(pDX, IDC_EDIT2, m_Edit2);
    DDX_Text(pDX, IDC_EDIT1, m_Edit1);
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CM_WinInetDlg, CDialog)
    //{{AFX_MSG_MAP(CM_WinInetDlg)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CM_WinInetDlg message handlers

BOOL CM_WinInetDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // Add "About..." menu item to system menu.

    // IDM_ABOUTBOX must be in the system command range.
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);

    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    {
        CString strAboutMenu;
        strAboutMenu.LoadString(IDS_ABOUTBOX);
        if (!strAboutMenu.IsEmpty())
        {
            pSysMenu->AppendMenu(MF_SEPARATOR);
            pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
    }

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon
    
    // TODO: Add extra initialization here
    
    return TRUE;  // return TRUE  unless you set the focus to a control
}

void CM_WinInetDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    {
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    }
    else
    {
        CDialog::OnSysCommand(nID, lParam);
    }
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CM_WinInetDlg::OnPaint() 
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialog::OnPaint();
    }
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CM_WinInetDlg::OnQueryDragIcon()
{
    return (HCURSOR) m_hIcon;
}

void CM_WinInetDlg::OnButton1() 
{
    // TODO: Add your control notification handler code here
    const MAXBUF = 4096;
    CInternetSession session;
    CHttpConnection* pConnection = NULL;
    CHttpFile* pFile = NULL;
    char* buffer = new char[MAXBUF];
    UINT nBytesRead = 0;
    CString strServer, strObject;
    unsigned short nPort;
    DWORD dwServiceType;
 
 
    UpdateData(TRUE);
    if(m_Edit1.IsEmpty())
        return;
    if(!AfxParseURL(m_Edit1, dwServiceType, strServer, strObject, nPort))
    {
        MessageBox("HTTP请求解析失败，请重新输入！");
        return;
    }
    try {
        pConnection = session.GetHttpConnection((LPCTSTR)strServer, nPort);
        pFile = pConnection->OpenRequest(1, strObject);
        pFile->SendRequest();
        nBytesRead = pFile->Read(buffer, MAXBUF - 1);
        buffer[nBytesRead] = '';
        m_Edit2 = buffer;
        m_Edit2+="

...结束啦...";
        UpdateData(FALSE);
    }
    catch(CInternetException* e) {
         TCHAR   szError[1024]; 
         e->GetErrorMessage(szError,1024); 
         ::AfxMessageBox(szError); 
        e->Delete();
    }
 
 
    if(pFile) delete pFile;
    if(pConnection) delete pConnection;
    delete [] buffer;
    return;
}

End.