ch14demo4dlg.cpp

为了简化客户/服务者模式进行Internet编程

// Ch14Demo4Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Ch14Demo4.h"
#include "Ch14Demo4Dlg.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()

/////////////////////////////////////////////////////////////////////////////
// CCh14Demo4Dlg dialog

CCh14Demo4Dlg::CCh14Demo4Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCh14Demo4Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCh14Demo4Dlg)
	m_Url = _T("");
	m_Text = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCh14Demo4Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCh14Demo4Dlg)
	DDX_Text(pDX, IDC_EDIT1, m_Url);
	DDX_Text(pDX, IDC_EDIT2, m_Text);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCh14Demo4Dlg, CDialog)
	//{{AFX_MSG_MAP(CCh14Demo4Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_EN_CHANGE(IDC_EDIT1, OnChangeEdit1)
	ON_BN_CLICKED(IDC_SHOW, OnShow)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCh14Demo4Dlg message handlers

BOOL CCh14Demo4Dlg::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 CCh14Demo4Dlg::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 CCh14Demo4Dlg::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 CCh14Demo4Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CCh14Demo4Dlg::OnChangeEdit1() 
{
	// TODO: If this is a RICHEDIT control, the control will not
	// send this notification unless you override the CDialog::OnInitDialog()
	// function and call CRichEditCtrl().SetEventMask()
	// with the ENM_CHANGE flag ORed into the mask.
	
	// TODO: Add your control notification handler code here
	GetDlgItem (IDC_SHOW)->EnableWindow (TRUE);		//激活显示按钮
	
}

void CCh14Demo4Dlg::OnShow() 
{
	// TODO: Add your control notification handler code here
	CInternetSession httpsession;						//定义网络连接Session
	CString Line;
	CInternetFile* webfile=NULL;						//定义一个文件对象指针
	UpdateData();						
	if(m_Url.Left(7)!="http://")	//如果地址不含HTTP类型标志则添加本地文件类型标志
	{
		m_Url="http://"+m_Url;
	}
	try
	{
		webfile=(CInternetFile*)httpsession.OpenURL(m_Url);//打开连接
	}
	catch(CInternetException*pException)					//捕捉异常
	{
		webfile=NULL;
		pException->Delete();
	}
	if(webfile)
	{
		//读出文件前一部分，这里如果文件多于80行，这里只显示前80行
		int i=0;
		while(webfile->ReadString(Line)&&i<80)
		{
			m_Text=m_Text+Line+"\r\n";				//加入换行标志
			i++;
		}
	}
	UpdateData(FALSE);									//更新显示文件
	delete webfile;										//删除文件
	GetDlgItem (IDC_SHOW)->EnableWindow (FALSE);		//禁用显示按钮
	httpsession.Close();								//关闭连接
}