Windows下C语言的Socket编程例子（TCP和UDP）

#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>

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

int main(int argc, char* argv[])
{
//初始化WSA
WORD sockVersion = MAKEWORD(2,2);
WSADATA wsaData;
if(WSAStartup(sockVersion, &wsaData)!=0)
{
return 0;
}

//创建套接字
SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(slisten == INVALID_SOCKET)
{
printf("socket error !");
return 0;
}

//绑定IP和端口
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(8888);
sin.sin_addr.S_un.S_addr = INADDR_ANY;
if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
{
printf("bind error !");
}

//开始监听
if(listen(slisten, 5) == SOCKET_ERROR)
{
printf("listen error !");
return 0;
}

//循环接收数据
SOCKET sClient;
sockaddr_in remoteAddr;
int nAddrlen = sizeof(remoteAddr);
char revData[255];
while (true)
{
printf("等待连接...\n");
sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
if(sClient == INVALID_SOCKET)
{
printf("accept error !");
continue;
}
printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));

//接收数据
int ret = recv(sClient, revData, 255, 0);
if(ret > 0)
{
revData[ret] = 0x00;
printf(revData);
}

//发送数据
char * sendData = "你好，TCP客户端！\n";
send(sClient, sendData, strlen(sendData), 0);
closesocket(sClient);
}

closesocket(slisten);
WSACleanup();
return 0;
}

#include "stdafx.h"
#include <WINSOCK2.H>
#include <STDIO.H>

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

int main(int argc, char* argv[])
{
WORD sockVersion = MAKEWORD(2,2);
WSADATA data;
if(WSAStartup(sockVersion, &data) != 0)
{
return 0;
}

SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sclient == INVALID_SOCKET)
{
printf("invalid socket !");
return 0;
}

sockaddr_in serAddr;
serAddr.sin_family = AF_INET;
serAddr.sin_port = htons(8888);
serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
{
printf("connect error !");
closesocket(sclient);
return 0;
}
char * sendData = "你好，TCP服务端，我是客户端!\n";
send(sclient, sendData, strlen(sendData), 0);

char recData[255];
int ret = recv(sclient, recData, 255, 0);
if(ret > 0)
{
recData[ret] = 0x00;
printf(recData);
}
closesocket(sclient);
WSACleanup();
return 0;
}

#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>

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

int main(int argc, char* argv[])
{
WSADATA wsaData;
WORD sockVersion = MAKEWORD(2,2);
if(WSAStartup(sockVersion, &wsaData) != 0)
{
return 0;
}

SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(serSocket == INVALID_SOCKET)
{
printf("socket error !");
return 0;
}

sockaddr_in serAddr;
serAddr.sin_family = AF_INET;
serAddr.sin_port = htons(8888);
serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
if(bind(serSocket, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
{
printf("bind error !");
closesocket(serSocket);
return 0;
}

sockaddr_in remoteAddr;
int nAddrLen = sizeof(remoteAddr);
while (true)
{
char recvData[255];
int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen);
if (ret > 0)
{
recvData[ret] = 0x00;
printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
printf(recvData);
}

char * sendData = "一个来自服务端的UDP数据包\n";
sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen);

}
closesocket(serSocket);
WSACleanup();
return 0;
}

#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>

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

int main(int argc, char* argv[])
{
WORD socketVersion = MAKEWORD(2,2);
WSADATA wsaData;
if(WSAStartup(socketVersion, &wsaData) != 0)
{
return 0;
}
SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(8888);
sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
int len = sizeof(sin);

char * sendData = "来自客户端的数据包.\n";
sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len);

char recvData[255];
int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len);
if(ret > 0)
{
recvData[ret] = 0x00;
printf(recvData);
}

closesocket(sclient);
WSACleanup();
return 0;
}