【Socket规划】套接字Windows台C语言

#include<stdio.h>
#include<stdlib.h>
#include<winsock2.h>

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

const int BACK_LOG = 5;

int main(int argc, char * argv[])
{
//初始化套接字
WSADATA wsaData;
int ret = WSAStartup(MAKEWORD(2, 4), &wsaData);
if (0 != ret){
fputs("WSAStartup error\n", stderr);
return 1;
}

//创建套接字
SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (INVALID_SOCKET == sock) {
fputs("socket() error\n", stderr);
WSACleanup();
return 1;
}

//绑定套接字
SOCKADDR_IN sockAddr;
memset(&sockAddr,0,sizeof(SOCKADDR_IN));
sockAddr.sin_family = AF_INET;//协议簇，一般用AF_INET表示TCP/IP协议
sockAddr.sin_addr.S_un.S_addr = htonl(ADDR_ANY);//表示IP地址
sockAddr.sin_port = htons(7);//表示端口

ret = bind(sock, (SOCKADDR*)&sockAddr, sizeof(sockAddr));
if (SOCKET_ERROR == ret) {
fputs("bind() error\n", stderr);
closesocket(sock);
WSACleanup();
return 1;
}

//侦听套接字
ret = listen(sock, BACK_LOG);
if (SOCKET_ERROR == ret) {
fputs("listen() error\n", stderr);
closesocket(sock);
WSACleanup();
return 1;
}

//接收套接字
SOCKADDR_IN clientAddr;
int szClientAddr = sizeof(clientAddr);

SOCKET clientSock = accept(sock, (SOCKADDR*)&clientAddr, &szClientAddr);

if (INVALID_SOCKET == clientSock){
fputs("accept() error\n", stderr);
closesocket(sock);
WSACleanup();
return 1;
}

//收发数据
TCHAR buff[256];
memset(&buff,0,sizeof(buff));

recv(sock,buff,sizeof(buff),0);//recv()返回读入的字节数

TCHAR buff2[] = "QUIT\n";
send(sock, buff2, sizeof(buff2), 0);//成功则返回实际传送出去的字符数

//回收资源
closesocket(sock);
closesocket(clientSock);
WSACleanup();

return 0;

}