《网络协议编程》实验报告单-基于winsock_API函数的MFC网络应用程序分析.doc

计算机网络工程-实践教程实验一报告单班 级_0906101_ 姓 名_贺嵘 _ 学 号_08_ 实验日期_ 评 分_ 教师签名_ 1实验名称基于winsock api与mfc的网络程序的编写与分析。2实验目的（1）进一步熟练掌握常用的winsock api函数。（2）掌握基于mfc的简单应用程序的编写方法，理解vc编写的windows应用程序的运行机制。（3）掌握基于winsock api函数与mfc的网络通信程序的编写方法。3实验地点 一实验楼510机房4实验环境计算机局域网、visual c+6.05实验性质实验性质：验证性。6实验学时实验课时：2学时。7实验内容（1）基于winsock api函数和udp协议的网络通信mfc程序的界面制作。（2）基于winsock api函数和udp协议的网络聊天mfc程序的代码编写。（3）聊天程序在局域网中两台不同电脑上的测试。（4）聊天程序在同一台电脑上的测试。（5）聊天程序核心代码分析说明。8实验步骤（1）基于winsock api函数和udp协议的网络通信mfc程序的界面制作。在visual c+6.0中，利用mfc appwizardexe新建一个工程，自拟工程名称，并注意设置该工程的保存位置（如图1所示），选择应用程序类型为“基本对话框”（如图2所示，并注意选中wosa支持（如图3所示），其余采用默认。 图1 图2图3在得到的工程的对话框资源上，放置两个文本控件，两个命令按钮，一个框架控件并修改各控件的属性和布局如图4所示。 图4（2）基于winsock api函数和udp协议的网络聊天mfc程序的代码编写。wychat.h的主要代码如下：class cwychatapp : public cwinapppublic:cwychatapp(); cwychatapp(); /添加的析构函数，便于winsock函数库的注销/ overrides/ classwizard generated virtual function overrides/afx_virtual(cwychatapp)public:virtual bool initinstance();/afx_virtual/ implementation/afx_msg(cwychatapp)/ note - the classwizard will add and remove member functions here./ do not edit what you see in these blocks of generated code !/afx_msgdeclare_message_map();wychat.cpp的主要代码如下：cwychatapp:cwychatapp() /析构函数 wsacleanup(); /注销winsock函数库/ the one and only cwychatapp objectcwychatapp theapp;/ cwychatapp initializationbool cwychatapp:initinstance() /在初始化函数中注册winsock函数库/if (!afxsocketinit()/afxmessagebox(idp_sockets_init_failed);/return false;/ word wversionrequested;wsadata wsadata;int err;wversionrequested = makeword( 2, 2 );err = wsastartup( wversionrequested, &wsadata );if ( err != 0 ) return false;if ( lobyte( wsadata.wversion ) != 2 | hibyte( wsadata.wversion ) != 2 ) wsacleanup( );return false; afxenablecontrolcontainer();wychatdlg.h的主要代码如下：#define msg_sock wm_user+1 /自行定义的winsock套接字消息编号/ cwychatdlg dialogclass cwychatdlg : public cdialog/ constructionpublic:cwychatdlg(cwnd* pparent = null);/ standard constructor cwychatdlg(); /自行添加的对话框析构函数/ dialog data/afx_data(cwychatdlg)enum idd = idd_wychat_dialog ;/ note: the classwizard will add data members here/afx_data/ classwizard generated virtual function overrides/afx_virtual(cwychatdlg)protected:virtual void dodataexchange(cdataexchange* pdx);/ ddx/ddv support/afx_virtual/ implementationprotected:hicon m_hicon;/ generated message map functions/afx_msg(cwychatdlg)virtual bool oninitdialog();afx_msg void onsyscommand(uint nid, lparam lparam);afx_msg void onpaint();afx_msg hcursor onquerydragicon();afx_msg void onsend();/afx_msg afx_msg void onsock(wparam,lparam); /自行添加的套接字响应函数declare_message_map()private:socket m_socket; /自行定义的私有套接字成员变量public:bool initsocket(); /自行定义的套接字初始化函数;wychatdlg.cpp的主要代码如下：cwychatdlg:cwychatdlg() /自行添加的析构函数 if(m_socket)closesocket(m_socket); /关闭套接字begin_message_map(cwychatdlg, cdialog)/afx_msg_map(cwychatdlg)on_wm_syscommand()on_wm_paint()on_wm_querydragicon()on_bn_clicked(idsend, onsend)/afx_msg_map on_message(msg_sock,onsock) /自行添加的消息关联end_message_map()/ cwychatdlg message handlersbool cwychatdlg: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 appendmenu(mf_separator);psysmenu-appendmenu(mf_string, idm_aboutbox, straboutmenu);/ set the icon for this dialog. the framework does this automatically/ when the applications main window is not a dialogseticon(m_hicon, true);/ set big iconseticon(m_hicon, false);/ set small icon/ todo: add extra initialization hereinitsocket(); /自行添加的套接字初始化函数调用return true; / return true unless you set the focus to a controlbool cwychatdlg:initsocket() m_socket=socket(af_inet,sock_dgram,0); if(invalid_socket=m_socket) int a=wsagetlasterror(); cstring str; str.format(%d,a); messagebox(str); return false; sockaddr_in addrsock; addrsock.sin_addr.s_un .s_addr =inet_addr(127.0.0.1); addrsock.sin_family =af_inet; addrsock.sin_port =htons(5003); if(bind(m_socket,(sockaddr*)&addrsock,sizeof(sockaddr)=socket_error) / afxmessagebox(_t(bind failed!); int a=wsagetlasterror(); cstring str; str.format(bind=%d,a); afxmessagebox(str); return false; if(wsaasyncselect(m_socket,m_hwnd,msg_sock,fd_read|fd_write)=socket_error) afxmessagebox(_t(register read event of net failed!); return false; return true;void cwychatdlg:onsock(wparam wparam,lparam lparam) switch(loword(lparam)case fd_read:char buff254; sockaddr_in addr2; int n=sizeof(addr2); long charnum=0; cstring strfilelen=; charnum=:recvfrom(m_socket,buff,sizeof(buff),0,(sockaddr*)&addr2,&n); buffcharnum=0; /在接收缓冲区实际接收到的字符串尾部加上结束标志cstring strtemp; getdlgitemtext(idc_editchat,strtemp);strtemp=strtemp+rn+对方说：+buff; /setdlgitemtext(idc_editchat,buff); setdlgitemtext(idc_editchat,strtemp); updatedata(false);break; case fd_write: default: break;/ the system calls this to obtain the cursor to display while the user drags/ the minimized window.hcursor cwychatdlg:onquerydragicon()return (hcursor) m_hicon;void cwychatdlg:onsend() / todo: add your control notification handler code here cstring strsend; getdlgitemtext(idc_edit_send,strsend);sockaddr_in addr,addr2;int n=sizeof(addr2);char buff10=0;addr.sin_family=af_inet;addr.sin_port=htons(7600); /设置对方的端口号 addr.sin_addr.s_un.s_addr=inet_addr(127.0.0.1);/设置对方的ip/*int n1=strsend.getlength();cstring msg;msg.format(%d,n1); messagebox(msg);*/ if(strsend.getlength()!=0) :sendto(m_socket,strsend,strsend.getlength(),0,(sockaddr*)&addr,n); cstring strtemp; cstring mychat; getdlgitemtext(idc_editchat,strtemp); getdlgitemtext(idc_edit_send,mychat); strtemp=strtemp+rn+你说：+mychat; /setdlgitemtext(idc_editchat,buff); setdlgitemtext(idc_editchat,strtemp); setdlgitemtext(idc_edit_send,); else afxmessagebox(_t(不能发送空消息!);（3）聊天程序在局域网中两台不同电脑上的测试。每两个同学（称为甲乙）为一小组，分别在两台不同的电脑上编写程序，注意双方本机与远程机ip地址、端口号的正确设定。若程序编写好后，双方均启动程序，验证并观察双方的通信反馈信息，进行即时的点到点的在线聊天。在甲同学编写的wychatdlg.cpp文件中的bool cwychatdlg:initsocket()