C/C++ TCP客户端服务器简单示例
Posted 福州-司马懿
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使用VS2010新建2个项目，一个叫 “tcpserver” ，另一个叫 “tcpclient”。
右击 "项目" --> "属性" --> "配置属性" --> "链接器" --> "输入" --> "附加依赖项" ，在右侧下拉框中点击 “编辑” 按钮，添加 “WS2_32.lib”，单击确定。
1、项目tcpserver
// tcpserver.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <WinSock2.h>
#include <stdio.h>
#define SERVERPORT 6222 //服务器端口
int _tmain(int argc, _TCHAR* argv[])
{
//用来保存WinSock库的版本号
WORD wVersionRequested;
WSADATA wsaData;
int err;
printf("This is a Server side application!\\n");
wVersionRequested = MAKEWORD(2,2);
err = WSAStartup(wVersionRequested, &wsaData);
if(err != 0) {
printf("WSAStartup() called failed!\\n");
return -1;
} else {
printf("WSAStartup() called successful!\\n");
}
if(LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
//若不是所请求的版本号2.2,则终止WinSock库的使用
WSACleanup();
return -1;
}
//创建用于监听的套接字
SOCKET sockServer = socket(AF_INET, SOCK_STREAM, 0);
if(sockServer == INVALID_SOCKET) {
printf("socket() called failed!, error code is: %d", WSAGetLastError());
return -1;
} else {
printf("socket() called successful!\\n");
}
//填充服务器端套接字结构
SOCKADDR_IN addrServer;
//将主机字节顺序转换为TCP/IP网络字节顺序
addrServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
addrServer.sin_family = AF_INET;
addrServer.sin_port = htons(SERVERPORT);
//将套接字绑定到一个本地地址和端口上
err = bind(sockServer, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));
if(err == SOCKET_ERROR) {
printf("bind() called failed! The error code is: %d\\n", WSAGetLastError());
return -1;
} else {
printf("bind() called successful\\n");
}
//将套接字设置为监听模式,准备接收客户端请求
err = listen(sockServer, 5);
if(err == SOCKET_ERROR) {
printf("listen() called failed! The error code is: %d\\n", WSAGetLastError());
return -1;
} else {
printf("listen() called successful!\\n");
}
//保存发送请求链接的客户端的套接字信息
SOCKADDR_IN addrClient;
int len = sizeof(SOCKADDR);
bool isStart = true;
while(isStart) {
//等待客户端请求到来
SOCKET sockConn = accept(sockServer, (SOCKADDR*)&addrClient, &len);
if(sockConn == INVALID_SOCKET) {
printf("accept() called failed! The error code is: %d\\n", WSAGetLastError());
} else {
printf("The server receive a new client connection!\\n");
}
char sendBuf[100];
sprintf_s(sendBuf, 100, "Welcome %s", inet_ntoa(addrClient.sin_addr));
//发送数据
send(sockConn, sendBuf, strlen(sendBuf)+1, 0);
char recvBuf[100];
//接收数据
recv(sockConn, recvBuf, 100, 0);
//打印接收到的数据
printf("receive data from client side [%s, %d] is: %s\\n", inet_ntoa(addrClient.sin_addr), addrClient.sin_port, recvBuf);
//关闭连接套接字
closesocket(sockConn);
}
return 0;
}
2、项目tcpclient
// tcpclient.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <WinSock2.h>
#include <stdio.h>
#define SERVER_PORT 6222 //服务器端口号
#define BUFF_SIZE 1024
#pragma comment(lib, "WS2_32.lib")
int _tmain(int argc, _TCHAR* argv[])
{
//加载套接字库
WORD wVersionRequested;
WSAData wsaData;
int err;
printf("This is a Client side application!\\n");
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if(err != 0) {
//Tell the user that we could not find a usable WinSock Dll.
printf("WSAStartup() called failed!\\n");
return -1;
} else {
printf("WSAStartup called successful!\\n");
}
if(LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
//Tell the user that we could not find a usable WinSock Dll.
WSACleanup();
return -1;
}
//The WinSock Dll is acceptable. Proceed
//创建套接字
SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);
if(sockClient == INVALID_SOCKET) {
printf("socket() called failed!, error code is %d\\n", WSAGetLastError());
return -1;
} else {
printf("socket() called successful!\\n");
}
//需要连接的服务端套接字结构信息
SOCKADDR_IN addrServer;
//设定服务器IP
addrServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
addrServer.sin_family = AF_INET;
//设定服务器的端口号(使用网络字节序)
addrServer.sin_port = htons(SERVER_PORT);
//向服务器发出连接请求
err = connect(sockClient, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));
if(err == SOCKET_ERROR) {
printf("connect() called failed! The error code is %d\\n", WSAGetLastError());
} else {
printf("connect() called successful\\n");
}
//接收数据
char recvBuf[BUFF_SIZE] = {0};
recv(sockClient, recvBuf, 100, 0);
printf("receive data from server side is: %s\\n", recvBuf);
//发送数据
char buf[] = "This is a client side!\\n";
send(sockClient, buf, strlen(buf)+1, 0);
//关闭套接字
closesocket(sockClient);
//终止套接字库的使用
WSACleanup();
system("pause");
return 0;
}
（1）连接成功
（2）客户端连接失败
以下是从百度百科摘录的WSASetLastError()
的返回值
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