c语言socket

一.socket_server

#include <stdio.h>
#include <winsock2.h>
#pragma comment (lib, "ws2_32.lib")  //加载 ws2_32.dll
#pragma warning(disable:4996) 
int server_main() {
	//初始化 DLL
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	//创建套接字 PF_INET:IPv4
	SOCKET servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	//绑定套接字
	struct sockaddr_in sockAddr;
	memset(&sockAddr, 0, sizeof(sockAddr));  //每个字节都用0填充

	sockAddr.sin_family = PF_INET;  //使用IPv4地址
	sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址
	sockAddr.sin_port = htons(1234);  //端口
	bind(servSock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));

	//进入监听状态
	listen(servSock, 20);
	//接收客户端请求
	SOCKADDR clntAddr;
	int nSize = sizeof(SOCKADDR);
	SOCKET clntSock = accept(servSock, (SOCKADDR*)&clntAddr, &nSize);
	printf("connect client\n");
	//向客户端发送数据
	char str[] = "Hello World!";  
	send(clntSock, str, strlen(str) + sizeof(char), NULL);
	//关闭套接字
	closesocket(clntSock);
	closesocket(servSock);
	//终止 DLL 的使用
	WSACleanup();
	return 0;
}

二.socket_client

#include <stdio.h>
#include <stdlib.h>
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib")  
#pragma warning(disable:4996) 
//加载 ws2_32.dll
int socket_main() {
    //初始化DLL
    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);
    //创建套接字
    SOCKET sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
    //向服务器发起请求
    sockaddr_in sockAddr;
    memset(&sockAddr, 0, sizeof(sockAddr));  //每个字节都用0填充
    sockAddr.sin_family = PF_INET;
    sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    sockAddr.sin_port = htons(1234);
    connect(sock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));
    //接收服务器传输的数据
    char szBuffer[MAXBYTE] = { 0 };
    recv(sock, szBuffer, MAXBYTE, NULL);
    //输出接收到的数据
    printf("Message form server: %s\n", szBuffer);
    //关闭套接字
    closesocket(sock);
    //终止使用 DLL
    WSACleanup();
    system("pause");
    return 0;
}