VC6.0编写C/S消息传送程序

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　　网络编程已经成为一种时髦，以TCP/IP协议的网络更为流行.自己编一个服务器与客户机互相传送消息的程序,以便增加自己网络编程的经验.下面我就介绍一下我编的程序.

　　首先介绍服务器程序：

　　1.创建一个名为"server"的项目,单文档界面.

　　2.在serverview.h中加入代码：

#include "winsock.h"

　添加变量：

CSize sizeTotal;//控制滚动条
int count;//信息条数
CString m_data[1000];//信息存放
char　　Hostname[260];
char Hostaddress[20];//主机IP地址
SOCKET m_sock;
HANDLE m_hListenThread;//线程
BOOL m_bInitialized;//是否初始化
WSADATA WSAData;
BOOL flag;
SOCKADDR_IN saClnt;
int saClntLen;
BOOL Isconnect;//是否连接

　　3.在serverview.cpp中重载CServerView()构造器,创建并绑定嵌套字：

CServerView::CServerView()
{ // TODO: add construction code here
Isconnect=FALSE;
flag=FALSE;
sizeTotal.cy=350;
sizeTotal.cx=300;
m_hListenThread;
count=5;
int status;
WSADATA wsaData;
m_data[0]="initializing Windows Sockets DLL....";
if((status=WSAStartup(0x0101,&wsaData))==0)
{ m_data[0]+="Succeeded";
m_bInitialized=TRUE;
}
else
{ m_bInitialized=FALSE;
}
m_sock=socket(AF_INET,SOCK_DGRAM,0);
m_data[1]="Creating socket....";
if(m_sock==INVALID_SOCKET)
{ m_data[1]+="Failed";
}
m_data[1]+="Succeeded";
m_data[2]="Binding socket....";
sockaddr_in sa;
sa.sin_family=AF_INET;
sa.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
sa.sin_port=htons(5050);
if(bind(m_sock,(PSOCKADDR)&sa,
sizeof(sa))==SOCKET_ERROR)
{ m_data[2]+="Failed";
closesocket(m_sock);
}

　　 4.在析构函数中完成必需的清除操作:

CServerView::~CServerView()
{ if(m_bInitialized)
WSACleanup();
closesocket(m_sock);
if(m_hListenThread)
::TerminateThread(m_hListenThread,0);
}

　　　 5.定褰邮蘸痛硐⒌南叱？

long WINAPI Listen(CServerView *pView)
{ char msg[2000]="";
int nchar;
SOCKADDR_IN saClnt;
int saClntLen;
while(1)
{ saClntLen=sizeof(saClnt);
nchar=recvfrom(pView- ＞m_sock,msg,
1024,0,(PSOCKADDR)&saClnt,&saClntLen);
if(nchar 0)
{ pView- ＞m_data[pView- ＞count++]+
="Error in recvfrom
";
pView- ＞InvalidateRect(NULL);
}
else
{

switch(msg[0])
{
case ’A’:
　 wsprintf(msg,"A:Client from %s attached
",
inet_ntoa(saClnt.sin_addr));
pView- ＞m_data[pView- ＞count++]=msg;
pView- ＞flag=TRUE;
pView- ＞InvalidateRect(NULL);
pView- ＞Isconnect=TRUE;
pView- ＞saClnt=saClnt;
pView- ＞saClntLen=saClntLen;
sendto(pView- ＞m_sock,msg,1024,0,
(PSOCKADDR)&saClnt,saClntLen);
break;

case ’D’:
wsprintf(msg,"D: Client form %s detached
",
inet_ntoa(saClnt.sin_addr));
pView- ＞m_data[pView- ＞count++]=msg;
pView- ＞flag=TRUE;
pView- ＞InvalidateRect(NULL);
pView- ＞Isconnect=FALSE;
sendto(pView- ＞m_sock,msg,1024,0,
(PSOCKADDR)&saClnt,saClntLen);
break;

case ’R’:
saClntLen=sizeof(saClnt);
pView- ＞m_data[pView-＞count++]=msg;
pView- ＞flag=TRUE;
pView- ＞InvalidateRect(NULL);
break;

default:
break;
}

}

}
return(0);
}
6.在程序菜单项中添加"本机IP地址":

void CServerView::OnIp()
{ int WSAReturn;
WSAReturn=WSAStartup( 0x0101, &WSAData );
if( WSAReturn == 0 ){
gethostname( Hostname, 260 );
struct hostent *pHostEnt;
HostEnt = gethostbyname( Hostname);
if( pHostEnt != NULL ){
wsprintf( Hostaddress, "%d.%d.%d.%d",
( pHostEnt- ＞h_addr_list[0][0] & 0x00ff ),
( pHostEnt - ＞h_addr_list[0][1] & 0x00ff ),
( pHostEnt- ＞h_addr_list[0][2] & 0x00ff ),
( pHostEnt- ＞h_addr_list[0][3] & 0x00ff ) );
CString out;
out.Format(Hostaddress);
AfxMessageBox(out);
}
}
}

　　7.在程序菜单中添加"发送消息"：

void CServerView::OnSendmessage()
{// TODO: Add your command handler code here
char msg[2000];
Csend Sendmessage;
if(Sendmessage.DoModal()==
IDOK&&!Sendmessage.m_Message.IsEmpty())
{ wsprintf(msg,"R: "+
Sendmessage.m_Message);
sendto(m_sock,msg,1024,0,
(PSOCKADDR)&saClnt,saClntLen);
m_data[count++]=Sendmessage.m_Message;
flag=TRUE;
InvalidateRect(NULL);
}
}

　　8.为发送消息项添加一个对话框的类,名为send,有一个文本框,用来发送消息.并为文本框添加CString m_Message 变量,并在ServerView.cpp中添加#include "send.h"

　　9.为发送消息项添加一个判断函数:

void CServerView::OnUpdateSendmessage(CCmdUI* pCmdUI)
{// TODO: Add your command update UI handler code here
pCmdUI-　＞Enable(FALSE);
if(Isconnect)
pCmdUI- ＞Enable(TRUE);
}

　　 10.再窗口显示消息:

void CServerView::OnDraw(CDC* pDC)
{ if(flag)
{ sizeTotal.cy+=20;
for(int j=65;j m_data[count-1].GetLength();j++)
sizeTotal.cx+=15;
OnInitialUpdate();
flag=FALSE;
}
CServerDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
int y=10;
for(int i=0;i count;i++)
{ pDC- ＞TextOut(10,y,m_data);
y+=20;
}
// TODO: add draw code for native data here
}

　　11.在Project中点击Settings中选择Link项添加wsock32.lib.最后编译程序,就可以得到Server.exe程序.

　　现在介绍客户机程序:

　　1.创建一个名为"client"的项目,单文档界面.

　　2.在clientview.h中加入代码：

#include "winsock.h"

　　添加变量:

CString m_data[1000];
HANDLE m_hListenThread;
SOCKET m_sock;
SOCKADDR_IN m_saSrvr;
BOOL Isconnect;
int count;
CSize sizeTotal;
BOOL flag;

　　3.在构造函数中初始化变量:

CClientView::CClientView()
{ // TODO: add construction code here
Isconnect=FALSE;
sizeTotal.cy=350;
sizeTotal.cx=300;
flag=FALSE;
}

　　4.在析构函数中完成清除操作，代码如上:

　　5.在菜单中添加"拨号"项:

void CClientView::OnDial()
{// TODO: Add your command handler code here
count=5;
if(m_bInitialized)
{ AfxMessageBox("Already dialing");
return;
}
Cdial dial;
if(dial.DoModal()==IDOK&&!dial.
m_HostAddress.IsEmpty())
{m_saSrvr.sin_family=AF_INET;
m_saSrvr.sin_addr.S_un.S_addr
=htonl(INADDR_ANY);
m_saSrvr.sin_addr.S_un.S_addr
=inet_addr(dial.m_HostAddress);
m_saSrvr.sin_port=htons(5050);
int status;
WSADATA wsaData;
m_data[0]="initializing Windows Sockets DLL....";
if((status=WSAStartup(0x0101,&wsaData))==0)
{ m_data[0]+="Succeeded";
m_bInitialized=TRUE;
}
else
{ m_bInitialized=FALSE;
}
m_sock=socket(AF_INET,SOCK_DGRAM,0);
m_data[1]="Creating socket....";
if(m_sock==INVALID_SOCKET)
{ m_data[1]+="Failed";
}