怎么做一个简单的网络通信程序

[bigbee]

一个作业.就是在一台电脑上发一串数据,在另一台电脑上收.
应该很简单的吧.可我不会做.最好用c/c++

[xuying]

去这里下载吧:
http://asp.6to23.com/vcprogram/source/source_right.asp

[antshome]

MSDN里有例子的啊

[dycdyc123]

我有代码！

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
intcount;//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
WSADATAWSAData;
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);
}
m_data[2]+="Succeeded";
m_data[3]="Creating listener thread....";
unsigned long idThread;
m_hListenThread=CreateThread(NULL,0,
(LPTHREAD_START_ROUTINE)Listen,(void *)
this,0,&idThread);
if(m_hListenThread)
{m_data[3]+="Succeeded";
m_data[4]+="Listening....";
}
else
m_data[4]+="Failed";

}

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.定义接收和处理消息的线程:

long WINAPI Listen(CServerView *pView)
{

char msg[2000]="";
intnchar;
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\n";
pView->InvalidateRect(NULL);
}
else
{

switch(msg[0])
{
case'A':
wsprintf(msg,"A: Client from %s
attached\n",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\n",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);
}

[dycdyc123]

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;
pHostEnt = 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;jTextOut(10,y,m_data[i]);
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;
BOOLIsconnect;
int count;
CSize sizeTotal;
BOOLflag;

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:

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

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";
}
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(0);
if(bind(m_sock,(PSOCKADDR)&sa,
sizeof(sa))==SOCKET_ERROR)
{
m_data[2]+="Failed";
closesocket(m_sock);
}
m_data[2]+="Succeeded";
m_data[3]="Creating listener thread....";
unsigned long idThread;
m_hListenThread=CreateThread(NULL,0,
(LPTHREAD_START_ROUTINE)Listen,
(void *)this,0,&idThread);
if(m_hListenThread)
{m_data[3]+="Succeeded";
m_data[4]+="Waiting....";
}
else
m_data[4]+="Failed";
InvalidateRect(NULL);
}

}

6.添加一个拨号对话框,名为dial,有一个文本框用来写IP地址.并在clientview.cpp中添加代码:

#include dial.h

7.在拨号项添加一个判断函数:

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

8.添加接收与发送消息的线程:

long WINAPI Listen(CClientView *pView)
{
char msg[2000];
pView- >m_data[5]="Sending ATTACH command";
pView- >InvalidateRect(NULL);
wsprintf(msg,"A: ");
sendto(pView- >m_sock,msg,1024,0,
(PSOCKADDR)&pView- >m_saSrvr,sizeof
(pView- >m_saSrvr));

int saSrvrLen ,nchar;
while(1)
{
saSrvrLen=sizeof(pView->m_saSrvr);
nchar=recvfrom(pView- >m_sock,msg,1024,0,
(PSOCKADDR)&pView- >m_saSrvr,&saSrvrLen);
if(nchar<0) { pView->m_data[pView- >count++]="Error in recvform";
pView- >InvalidateRect(NULL);
}
else
{
pView->m_data[pView- >count++]=msg;
pView->Isconnect=TRUE;
pView->flag=TRUE;
pView->InvalidateRect(NULL);
}

}

return(0);
}

9.同主程序一样做一个发送消息项,代码如上.

10.显示程序也与主程序一样,代码如上.

11.在Project中点击Settings中选择Link项添加wsock32.lib.

12.编译程序便可得到client.exe程序.

server.exe 和 client.exe 做完后,就可以在具有TCP/IP协议下的网络中执行. 通过上面的例子,你可以很快了解vc++网络编程的优点,你还可以添加其它功能项,在这我就不多加叙述了.希望我的程序能起到抛砖引玉的目的,让我们都能编出好的网络程序.