《网络程序设计》实验4_基于MFC CAsyncSocket类的网络通信

苏州大学实验报告

院、系文正学院年级专业12物理网姓名高成波学号1217443036 课程名称网络程序设计成绩

指导教师陆建德同组实验者无实验日期

实验名称实验四基于MFC CAsyncSocket类的网络通信

一.实验内容（要求先完成题目，然后上机验证）

本实验利用Visual C++ MFC CAsyncSocket类进行网络程序设计。参照实验4讲义示例，完成基于CAsyncSocket类的点到点网络聊天通信程序，并上机调试。要求可以实现本机间以及在同一网络内不同主机之间的通信。

实验报告内容包括主要的实验代码、必要的注释或另外的说明文档以及实验结果与分析。

ChatClientDlg.cpp

#include "stdafx.h"

#include "ChatClient.h"

#include "ChatClientDlg.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()

/////////////////////////////////////////////////////////////////////////////

// CChatClientDlg dialog

CChatClientDlg::CChatClientDlg(CWnd* pParent /*=NULL*/)

: CDialog(CChatClientDlg::IDD, pParent)

{

//{{AFX_DATA_INIT(CChatClientDlg)

m_edit_server = _T("");

m_edit_msg = _T("");

//}}AFX_DATA_INIT

// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

}

void CChatClientDlg::DoDataExchange(CDataExchange* pDX)

{

CDialog::DoDataExchange(pDX);

//{{AFX_DATA_MAP(CChatClientDlg)

DDX_Control(pDX, IDC_LIST_MSG, m_list_msg);

DDX_Text(pDX, IDC_EDIT_SEVER, m_edit_server);

DDX_Text(pDX, IDC_EDIT_MSG, m_edit_msg);

//}}AFX_DATA_MAP

}

BEGIN_MESSAGE_MAP(CChatClientDlg, CDialog)

//{{AFX_MSG_MAP(CChatClientDlg)

ON_WM_SYSCOMMAND()

ON_WM_PAINT()

ON_WM_QUERYDRAGICON()

ON_BN_CLICKED(IDC_BTN_CONNECT, OnBtnConnect)

ON_BN_CLICKED(IDC_BTN_DISCONNECT, OnBtnDisconnect)

ON_BN_CLICKED(IDC_BTN_MSG_SEND, OnBtnMsgSend)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////

// CChatClientDlg message handlers

BOOL CChatClientDlg::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

GetDlgItem(IDC_BTN_CONNECT)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_DISCONNECT)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_MSG_SEND)->EnableWindow(FALSE);

GetDlgItem(IDCANCEL)->EnableWindow(TRUE);

return TRUE; // return TRUE unless you set the focus to a control

}

void CChatClientDlg::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 CChatClientDlg::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);

}

{

CDialog::OnPaint();

}

}

// The system calls this to obtain the cursor to display while the user drags // the minimized window.

HCURSOR CChatClientDlg::OnQueryDragIcon()

{

return (HCURSOR) m_hIcon;

}

/////////////////////////////////////////////////////////////////////////////

// CMySocket

CMySocket::CMySocket()

{

}

CMySocket::~CMySocket()

{

}

// Do not edit the following lines, which are needed by ClassWizard.

#if 0

BEGIN_MESSAGE_MAP(CMySocket, CAsyncSocket)

//{{AFX_MSG_MAP(CMySocket)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

#endif // 0

/////////////////////////////////////////////////////////////////////////////

// CMySocket member functions

void CMySocket::OnClose(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatClientDlg * p_Dlg;

p_Dlg = (CChatClientDlg *) ::AfxGetMainWnd();

p_Dlg->close();

CAsyncSocket::OnClose(nErrorCode);

}

void CMySocket::OnSend(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatClientDlg * p_Dlg;

p_Dlg = (CChatClientDlg *) ::AfxGetMainWnd();

p_Dlg->send();

}

CAsyncSocket::OnSend(nErrorCode);

}

void CMySocket::OnReceive(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatClientDlg * p_Dlg;

p_Dlg = (CChatClientDlg *) ::AfxGetMainWnd();

p_Dlg->recv();

}

CAsyncSocket::OnReceive(nErrorCode);

}

void CMySocket::OnConnect(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatClientDlg * p_Dlg;

p_Dlg = (CChatClientDlg *) ::AfxGetMainWnd();

p_Dlg->connect();

}

CAsyncSocket::OnConnect(nErrorCode);

}

void CChatClientDlg::recv()

{

char buf[1024];

CString msg;

CString from = "对方：";

int len = m_worksocket.Receive(buf, 1024);

buf[len] = '\0';

msg = buf;

msg = from + msg;

m_list_msg.InsertString(0, msg);

}

void CChatClientDlg::send()

{

UpdateData(true);

if(!m_edit_msg.IsEmpty())

{

CString msg;

CString from = "自己：";

msg = from + m_edit_msg;

int len = m_edit_msg.GetLength();

m_worksocket.Send(m_edit_msg, len);

m_list_msg.InsertString(0, msg);

}

m_edit_msg.Empty();

UpdateData(FALSE);

}

void CChatClientDlg::close()

{

m_worksocket.Close();

AfxMessageBox("连接已经断开！");

GetDlgItem(IDC_BTN_CONNECT)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_DISCONNECT)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_MSG_SEND)->EnableWindow(FALSE);

GetDlgItem(IDCANCEL)->EnableWindow(TRUE);

}

void CChatClientDlg::connect()

{

AfxMessageBox("连接成功！");

GetDlgItem(IDC_BTN_MSG_SEND)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_DISCONNECT)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_CONNECT)->EnableWindow(FALSE);

GetDlgItem(IDCANCEL)->EnableWindow(FALSE);

}

void CChatClientDlg::OnBtnConnect()

{

// TODO: Add your control notification handler code here

// TODO: Add your control notification handler code here

UpdateData(TRUE);

if(!m_edit_server.IsEmpty())

{

m_worksocket.Create();

m_worksocket.Connect(m_edit_server, iPort);

GetDlgItem(IDC_BTN_CONNECT)->EnableWindow(FALSE);

}

m_edit_server.Empty();

}

void CChatClientDlg::OnBtnDisconnect()

{

// TODO: Add your control notification handler code here

close();

}

void CChatClientDlg::OnBtnMsgSend()

{

// TODO: Add your control notification handler code here

send();

}

ChatSever.cpp

#include "stdafx.h"

#include "ChatSever.h"

#include "ChatSeverDlg.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()

/////////////////////////////////////////////////////////////////////////////

// CChatSeverDlg dialog

CChatSeverDlg::CChatSeverDlg(CWnd* pParent /*=NULL*/)

: CDialog(CChatSeverDlg::IDD, pParent)

{

//{{AFX_DATA_INIT(CChatSeverDlg)

m_edit_msg = _T("");

//}}AFX_DATA_INIT

// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

}

void CChatSeverDlg::DoDataExchange(CDataExchange* pDX)

{

CDialog::DoDataExchange(pDX);

//{{AFX_DATA_MAP(CChatSeverDlg)

DDX_Control(pDX, IDC_LIST_MSG, m_list_msg);

DDX_Text(pDX, IDC_EDIT_MSG, m_edit_msg);

//}}AFX_DATA_MAP

}

BEGIN_MESSAGE_MAP(CChatSeverDlg, CDialog)

//{{AFX_MSG_MAP(CChatSeverDlg)

ON_WM_SYSCOMMAND()

ON_WM_PAINT()

ON_WM_QUERYDRAGICON()

ON_BN_CLICKED(IDC_BTN_SER_OPEN, OnBtnSerOpen)

ON_BN_CLICKED(IDC_BTN_SER_CLOSE, OnBtnSerClose)

ON_BN_CLICKED(IDC_BTN_DISCONNECT, OnBtnDisconnect)

ON_BN_CLICKED(IDC_BTN_MSG_SEND, OnBtnMsgSend)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////

// CChatSeverDlg message handlers

BOOL CChatSeverDlg::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

GetDlgItem(IDC_BTN_SER_OPEN)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_SER_CLOSE)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_DISCONNECT)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_MSG_SEND)->EnableWindow(FALSE);

GetDlgItem(IDCANCEL)->EnableWindow(TRUE);

UpdateData(FALSE);

return TRUE; // return TRUE unless you set the focus to a control

}

void CChatSeverDlg::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 CChatSeverDlg::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 CChatSeverDlg::OnQueryDragIcon()

{

return (HCURSOR) m_hIcon;

}

/////////////////////////////////////////////////////////////////////////////

// CMySocket

CMySocket::CMySocket()

{

}

CMySocket::~CMySocket()

{

}

// Do not edit the following lines, which are needed by ClassWizard.

#if 0

BEGIN_MESSAGE_MAP(CMySocket, CAsyncSocket)

//{{AFX_MSG_MAP(CMySocket)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

#endif // 0

/////////////////////////////////////////////////////////////////////////////

// CMySocket member functions

void CMySocket::OnAccept(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatSeverDlg * p_Dlg;

p_Dlg = (CChatSeverDlg*) ::AfxGetMainWnd();

p_Dlg->accept();

}

CAsyncSocket::OnAccept(nErrorCode);

}

void CMySocket::OnClose(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatSeverDlg * p_Dlg;

p_Dlg = (CChatSeverDlg *) ::AfxGetMainWnd();

p_Dlg->close();

}

CAsyncSocket::OnClose(nErrorCode);

void CMySocket::OnReceive(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatSeverDlg * p_Dlg;

p_Dlg = (CChatSeverDlg *) ::AfxGetMainWnd();

p_Dlg->recv();

}

CAsyncSocket::OnReceive(nErrorCode);

}

void CMySocket::OnSend(int nErrorCode)

{

// TODO: Add your specialized code here and/or call the base class if(nErrorCode == 0)

{

CChatSeverDlg * p_Dlg;

p_Dlg = (CChatSeverDlg *) ::AfxGetMainWnd();

p_Dlg->send();

}

CAsyncSocket::OnSend(nErrorCode);

}

void CChatSeverDlg::accept()

{

struct sockaddr_in cli;

int len = sizeof(cli);

CString strIpAddr;

m_listensocket.Accept(m_worksocket, (SOCKADDR*)&cli, &len);

strIpAddr = inet_ntoa(cli.sin_addr);

strIpAddr = "新的连接：" + strIpAddr;

AfxMessageBox(strIpAddr);

GetDlgItem(IDC_BTN_SER_CLOSE)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_MSG_SEND)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_DISCONNECT)->EnableWindow(TRUE);

void CChatSeverDlg::recv()

{

char buf[1024];

CString msg;

CString from = "对方：";

int len = m_worksocket.Receive(buf, 1024);

buf[len] = '\0';

msg = buf;

msg = from + msg;

m_list_msg.InsertString(0, msg);

UpdateData(FALSE); //将对应变量中字符串送控件中显示

}

void CChatSeverDlg::send()

{

UpdateData(TRUE); //将控件中显示的字符串送到对应的变量中

if(!m_edit_msg.IsEmpty())

{

CString msg;

CString from = "自己：";

int len = m_edit_msg.GetLength();

m_worksocket.Send(m_edit_msg, len);

msg = from + m_edit_msg;

m_list_msg.InsertString(0, msg);

}

m_edit_msg.Empty();

UpdateData(FALSE); //将对应变量中字符串送控件中显示，即这里显示为空}

void CChatSeverDlg::close()

{

m_worksocket.Close(); //释放worksocket底层套接字占用的资源

AfxMessageBox("连接已经断开！");

GetDlgItem(IDC_BTN_SER_CLOSE)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_MSG_SEND)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_DISCONNECT)->EnableWindow(FALSE); }

void CChatSeverDlg::OnBtnSerOpen()

{

UpdateData(TRUE);

// TODO: Add your control notification handler code here

m_listensocket.Create(iPort);

m_listensocket.Listen();

GetDlgItem(IDC_BTN_SER_OPEN)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_SER_CLOSE)->EnableWindow(TRUE);

GetDlgItem(IDCANCEL)->EnableWindow(FALSE);

}

void CChatSeverDlg::OnBtnSerClose()

{

// TODO: Add your control notification handler code here

m_listensocket.Close(); //释放listensocket底层套接字占用的资源GetDlgItem(IDC_BTN_SER_OPEN)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_SER_CLOSE)->EnableWindow(FALSE);

GetDlgItem(IDC_BTN_MSG_SEND)->EnableWindow(FALSE);

GetDlgItem(IDCANCEL)->EnableWindow(TRUE);

GetDlgItem(IDC_BTN_DISCONNECT)->EnableWindow(FALSE); }

void CChatSeverDlg::OnBtnDisconnect()

{

// TODO: Add your control notification handler code here

// TODO: Add your control notification handler code here

close();

}

void CChatSeverDlg::OnBtnMsgSend()

{

// TODO: Add your control notification handler code here

send();

}

实验结果与分析：本次实验运行结果是客户端与服务器端可以互相通信，并且在连接成功和断开连接时都有对话框提示。通过这次上机实验，让我熟练了对MFC基于对话框的编程，训练了自己的一项编程技能，让我受益匪浅。由于编程量比较大，所以编程的时候要特别当心出错，这次是按照老师给的实验讲义编程的，希望以后自己可以独立完成一次编程！