#include <stdio.h>                   //用于printf等函數(shù)的調(diào)用
#include <winsock2.h>                //Socket的函數(shù)調(diào)用　
#pragma comment (lib, "ws2_32")      //C語言引用其他類庫時，除了.h文件外，還要加入對應(yīng)的lib文件（這個不同于C#）

int main()
{
    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);

    SOCKET s=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

    sockaddr_in sockaddr;
    sockaddr.sin_family=PF_INET;
    sockaddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");   //需要綁定到本地的哪個IP地址
    sockaddr.sin_port=htons(9000);                          //需要監(jiān)聽的端口
    bind(s, (SOCKADDR*)&sockaddr, sizeof(SOCKADDR));        //進行綁定動作

    listen(s, 1);                                           //啟動監(jiān)聽

    printf("listening on port [%d].\n", 9000);

    while(TRUE)
    {
        SOCKADDR clientAddr;
        int size=sizeof(SOCKADDR);

        SOCKET clientsocket;
        clientsocket=accept(s, &clientAddr, &size);               //阻塞，直到有新tcp客戶端連接
        printf("***SYS***    New client touched.\n");

        char* msg="Hello, my client.\r\n";
        send(clientsocket, msg, strlen(msg)+sizeof(char), NULL);  //這里的第三個參數(shù)要注意，是加了一個char長度的
        printf("***SYS***    HELLO.\n");

        while(TRUE)
        {
            char buffer[MAXBYTE]={0};
            recv(clientsocket, buffer, MAXBYTE, NULL);            //一直接收客戶端socket的send操作
            printf("***Client***    %s\n", buffer);
        }

        closesocket(clientsocket);                                //關(guān)閉socket
    }

    closesocket(s);　　　　　　　　　　　　　　　　　　　　　　　　　　　//關(guān)閉監(jiān)聽socket

    WSACleanup();                                                //卸載

    getchar();                                                  

    exit(0);
}

#include <stdio.h>                      //用于輸入、輸出函數(shù)的調(diào)用,printf, gets
#include <winsock2.h>                   //socket頭文件
#include <Windows.h>                    //為了方便調(diào)試，所以加入了等待2秒才進行連接server，這里用到了sleep函數(shù)

#pragma comment (lib, "ws2_32")         //socket庫文件

int main()
{
    Sleep(2000);                        //沉睡2秒再連接server

    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);

    SOCKET s=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

    sockaddr_in sockaddr;
    sockaddr.sin_family=PF_INET;
    sockaddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
    sockaddr.sin_port=htons(9000);

    connect(s, (SOCKADDR*)&sockaddr, sizeof(SOCKADDR));

    char buffer[MAXBYTE]={0};
    recv(s, buffer, MAXBYTE, NULL);
    printf("***SERVER***%s", buffer);

    while(TRUE)
    {
        char* mymsg=new char[100000];
        printf("You can chat with server now:\n");
        gets(mymsg);
        send(s, mymsg, strlen(mymsg)+sizeof(char), NULL);
        /*
           recv函數(shù)中的bufferlength參數(shù)是可以固定值的
           send函數(shù)中的bufferlength參數(shù)不能固定值，需要看實際長度，并且考慮到'\0'字符串
        */
    }

    closesocket(s);

    WSACleanup();

    getchar();

    exit(0);
}