基于TCP/IP协议的socket编程

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开发环境：windows

开发工具：VC6.0

注意：由于我们使用的socket编程要使用到ws2_32.lib这个动态库，所以在我们编译之前要加上该动态库的连接

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服务器端的代码：

#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, "Welcome %s to http://www.xxx.org", 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);
}

}

客户端代码：

#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 sheng", strlen("this is sheng") + 1, 0);

closesocket(sockClient);
WSACleanup();
}