Question

如何用SOCKET实现两台计算机之间的通讯

用VC.
利用vc++的Socket 编程实现网络环境下两台计算机之间的字符聊天功能
给一个聊天窗口，可以传送文字信息就好，请帮忙给出具体程序，最好能运行

Answer 1

两部分代码，一个server，一个client。

server 端代码：

#include "stdio.h"  
#include "Winsock2.h"  
#include "iostream"  
#include "string"  
 
//#pragma comment(lib, "ws2_32.lib")  
 
//define host IP and usable port.  
#define HOST_IP 127.0.0.1  
#define HOST_PORT 8080  
#define OK_STR "OK"  
 
void main(){  
    //the version bit of Winsock  
    int version_a = 1;//low bit  
    int version_b = 1;//high bit  
 
    //makeword  
    WORD versionRequest = MAKEWORD(version_a,version_b);  
    WSAData wsaData;  
    int err;  
 
    err = WSAStartup(versionRequest, &wsaData);   
 
    if(err != 0 ){  
        printf("ERROR!");  
        return;  
    }  

    if (LOBYTE(wsaData.wVersion)  != 1 || HIBYTE(wsaData.wVersion) != 1)  
    {  
        printf("WRONG WINSOCK VERSION!");  
        WSACleanup();  
        return;  
    }  
 

    SOCKET socServer = socket(AF_INET, SOCK_DGRAM,0);  

    SOCKADDR_IN addr_Srv;  

    //It's nest three structs as S_un_b, S_un_w and S-un.(union)  
    addr_Srv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);  
    //set protocol family  
    addr_Srv.sin_family = AF_INET;  
    //set host port  
    addr_Srv.sin_port = htons(HOST_PORT);  
    //bind socket to  the host  
    bind(socServer,( SOCKADDR*) &addr_Srv, sizeof(SOCKADDR));  
     //address  of a client  
    SOCKADDR_IN addr_Clt;  
    char recvBuf[100];  
    int fromlen = sizeof(SOCKADDR);  
    while(true){  
    recvfrom(socServer, recvBuf, 100, 0,  (SOCKADDR*) &addr_Clt, &fromlen);     std::cout<<recvBuf<<std::endl;  
    sendto(socServer, OK_STR, strlen(OK_STR)+1, 0, (SOCKADDR*)&addr_Clt,sizeof(SOCKADDR));  
    }  
    closesocket(socServer);  
    WSACleanup(); 
}

 client端代码：

#include "Winsock2.h"  
#include "iostream"  
#include "stdio.h"  
#pragma comment(lib, "ws2_32.lib")  
 
 
#define HOST_IP "127.0.0.1"  
#define HOST_PORT 8080  
 
void main(){  
    //the version bit of Winsock  
    int version_a = 1;//low bit  
    int version_b = 1;//high bit  
   //makeword  
    WORD versionRequest = MAKEWORD(version_a,version_b);  
    WSAData wsaData;  
    int error;  
    error = WSAStartup(versionRequest, &wsaData);   
    if(error != 0   ){  
        printf("ERROR!");  
        return;  
    }  
    if (LOBYTE(wsaData.wVersion)  != 1 || HIBYTE(wsaData.wVersion) != 1)  
    {  
        printf("WRONG WINSOCK VERSION!");  
        WSACleanup();  
        return;  
    }  
    //request info obtained by user's input  
    char requestStr[100];  
    //build a sockeet   
    SOCKET socClient = socket(AF_INET, SOCK_DGRAM, 0);  
    SOCKADDR_IN addrSrv;         
    addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");         
    addrSrv.sin_family=AF_INET;     //set the protocol family  
    addrSrv.sin_port=htons(HOST_PORT);      //set the port number  
    // array to store the data that server feedback.  
    char cRecvBuf[100];  
   while(true){  
         std::cin>>requestStr;  
        //sendto function is used to send programe data to the server  
        sendto(socClient, requestStr, strlen(requestStr)+1, 0, (SOCKADDR*) &addrSrv, sizeof(SOCKADDR));  
         recv(socClient, cRecvBuf, strlen(cRecvBuf)+1, 0);  
         std::cout<< cRecvBuf << std::endl;  
    }  
      
    //close the socket and cleanup the wsadata  
    closesocket(socClient);  
    WSACleanup();  
//  return 0;  
}

Answer 2

两部分代码，一个server，一个client。
server
端代码：
#include "stdio.h"
#include "Winsock2.h"
#include "iostream"
#include "string"

//#pragma comment(lib, "ws2_32.lib")

//define host IP and usable port.
#define HOST_IP 127.0.0.1
#define HOST_PORT 8080
#define OK_STR "OK"

void main(){
//the version bit of Winsock
int version_a = 1;//low bit
int version_b = 1;//high bit

//makeword
WORD versionRequest = MAKEWORD(version_a,version_b);
WSAData wsaData;
int err;

err = WSAStartup(versionRequest, &wsaData);

if(err != 0 ){
printf("ERROR!");
return;
}
if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1)
{
printf("WRONG WINSOCK VERSION!");
WSACleanup();
return;
}

SOCKET socServer = socket(AF_INET, SOCK_DGRAM,0);
SOCKADDR_IN addr_Srv;
//It's nest three structs as S_un_b, S_un_w and S-un.(union)
addr_Srv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
//set protocol family
addr_Srv.sin_family = AF_INET;
//set host port
addr_Srv.sin_port = htons(HOST_PORT);
//bind socket to the host
bind(socServer,( SOCKADDR*) &addr_Srv, sizeof(SOCKADDR));
//address of a client
SOCKADDR_IN addr_Clt;
char recvBuf[100];
int fromlen = sizeof(SOCKADDR);
while(true){
recvfrom(socServer, recvBuf, 100, 0, (SOCKADDR*) &addr_Clt, &fromlen); std::cout<<recvBuf<<std::endl;
sendto(socServer, OK_STR, strlen(OK_STR)+1, 0, (SOCKADDR*)&addr_Clt,sizeof(SOCKADDR));
}
closesocket(socServer);
WSACleanup();
}
client端代码：
#include "Winsock2.h"
#include "iostream"
#include "stdio.h"
#pragma comment(lib, "ws2_32.lib")

#define HOST_IP "127.0.0.1"
#define HOST_PORT 8080

void main(){
//the version bit of Winsock
int version_a = 1;//low bit
int version_b = 1;//high bit
//makeword
WORD versionRequest = MAKEWORD(version_a,version_b);
WSAData wsaData;
int error;
error = WSAStartup(versionRequest, &wsaData);
if(error != 0 ){
printf("ERROR!");
return;
}
if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1)
{
printf("WRONG WINSOCK VERSION!");
WSACleanup();
return;
}
//request info obtained by user's input
char requestStr[100];
//build a sockeet
SOCKET socClient = socket(AF_INET, SOCK_DGRAM, 0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addrSrv.sin_family=AF_INET; //set the protocol family
addrSrv.sin_port=htons(HOST_PORT); //set the port number
// array to store the data that server feedback.
char cRecvBuf[100];
while(true){
std::cin>>requestStr;
//sendto function is used to send programe data to the server
sendto(socClient, requestStr, strlen(requestStr)+1, 0, (SOCKADDR*) &addrSrv, sizeof(SOCKADDR));
recv(socClient, cRecvBuf, strlen(cRecvBuf)+1, 0);
std::cout<< cRecvBuf << std::endl;
}

//close the socket and cleanup the wsadata
closesocket(socClient);
WSACleanup();
// return 0;
}

Answer 3

我把核心代码给你吧
客户端
#include <Winsock2.h>
#include <stdio.h>

void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 1, 1 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return;
}

if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 ) {
WSACleanup( );
return;
}
SOCKET sockClient=socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);
connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

char recvBuf[100];
recv(sockClient,recvBuf,100,0);
printf("%s\n",recvBuf);
send(sockClient,"This is lisi",strlen("This is lisi")+1,0);

closesocket(sockClient);
WSACleanup();
}

服务器端
#include <Winsock2.h>
#include <stdio.h>

void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 1, 1 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return;
}

if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 ) {
WSACleanup( );
return;
}
SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);

bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

listen(sockSrv,5);

SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);

while(1)
{
SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len);
char sendBuf[100];
sprintf(sendBuf,"来自服务器端",
inet_ntoa(addrClient.sin_addr));
send(sockConn,sendBuf,strlen(sendBuf)+1,0);
char recvBuf[100];
recv(sockConn,recvBuf,100,0);
printf("%s\n",recvBuf);
closesocket(sockConn);
}
}