socket编程 实现windows和linux服务器之间的通信

今天学了一下socket编程的内容，看了很多资料和代码，然后自己做了一下实验，一台windows客户端和linux主机之间进行通信，这两者的socket编程部分稍微有一些差别，不过大体上还是一样的，windows要做的准备工作要多一些。

linux服务器端代码：监听端口为6666

#include <iostream>
#include <cstdio>
#include <cstring>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
using namespace std;
#define MAXLINE 4096
int main(int argc,char * argv[])
{
    int listenfd,connfd;
    struct sockaddr_in servaddr;
    char buff[4096];
    int n;
    if((listenfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
    {
        printf("create socket error: %s(errno :%d)\n",strerror(errno),errno);
        exit(0);
    }
    memset(&servaddr,0,sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(6666);
    if(bind(listenfd,(struct sockaddr*)&servaddr, sizeof(servaddr)) == -1)
    {
        printf("bind socket error: %s(errno: %d)\n",strerror(errno),errno);
        exit(0);
    }
    if(listen(listenfd,10) == -1)
    {
        printf("listen socket error : %s(errno: %d)\n",strerror(errno),errno);
        exit(0);
    }
    printf("===========waiting for client's request========\n");
    while(1)
    {
        struct sockaddr_in nowaddr;
        int size = sizeof(sockaddr_in);
        if((connfd = accept(listenfd, (struct sockaddr*)&nowaddr, (socklen_t*)&size)) == -1)
        {
            printf("accept socket error: %s(errno: %d)",strerror(errno),errno);
            continue;
        }
        n = recv(connfd,buff,MAXLINE,0);
        buff[n] = '\0';
        printf("recv msg from client: %s\n",buff);
        close(connfd);
    }
    close(listenfd);
    return 0;
}

windows客户端部分

#include <winsock2.h>
#include <windows.h>
#include <iostream>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#pragma comment(lib,"ws2_32.lib")//注意链接库文件
#define MAXLINE 4096
int main(int argc,char * argv[])
{
    int n;
    SOCKET sockfd;
    char recvline[MAXLINE],sendline[4096];
    SOCKADDR_IN servaddr;
    WORD wVersionRequested; //typedef unsigned short WORD; 2字节
    WSADATA wsaData;
    int err;
    wsaData.wVersion =MAKEWORD(1,1);
    err=WSAStartup(wVersionRequested,&wsaData); //return 0 if successful
    if(err!=0)
    {
        printf("Call WSAStart ERROR!");
        exit(1);
    }
    if(argc != 2)
    {
        printf("usage: ./client <ipaddress>\n");
        exit(0);
    }
    if((sockfd = socket(AF_INET,SOCK_STREAM,0))< 0)
    {
        printf("create socket error: %s(errno: %d)\n",strerror(errno),errno);
        exit(0);
    }
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(6666);
    servaddr.sin_addr.S_un.S_addr=inet_addr(argv[1]);

    if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(SOCKADDR_IN))< 0)
    {
        printf("connect error: %s(errno: %d)\n",strerror(errno),errno);
        exit(0);
    }
    printf("send msg to server: \n");
    sprintf(sendline,"hello,it's the client msg");
    if(send(sockfd, sendline, strlen(sendline), 0) < 0)
    {
        printf("send msg error: %s(errno: %d)\n",strerror(errno),errno);
        exit(0);
    }
    closesocket(sockfd);
    exit(0);
}