基于Windows的服务器和客户端

server.c

#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
void ErrorHandling(char* message);

int main(int argc, char* argv[])
{
    WSADATA wsaData;
    SOCKET hServSock, hClntSock;
    SOCKADDR_IN servAddr, clntAddr;

    int szClntAddr;
    char message[] = "Hello World!";
    if (argc != 2)
    {
        printf("Usage : %s ,port>
", argv[0]);
        exit(1);
    }

    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
        ErrorHandling("WSAStartup() error!");

    hServSock = socket(PF_INET, SOCK_STREAM, 0);
    if (hServSock == INVALID_SOCKET)
        ErrorHandling("socket() error");

    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servAddr.sin_port = htons(atoi(argv[1]));

    if (bind(hServSock, (SOCKADDR *)&servAddr, sizeof(servAddr)) == SOCKET_ERROR)
        ErrorHandling("bind() error");

    if (listen(hServSock, 5) == SOCKET_ERROR)
        ErrorHandling("listen() error");

    szClntAddr = sizeof(clntAddr);
    hClntSock = accept(hServSock, (SOCKADDR *)&clntAddr, &szClntAddr);
    if (hClntSock == INVALID_SOCKET)
        ErrorHandling("accept() error");

    send(hClntSock, message, sizeof(message), 0);
    closesocket(hClntSock);
    closesocket(hClntSock);
    WSACleanup();
    return 0;
}

void ErrorHandling(char* message)
{
    fputs(message, stderr);
    fputc('
', stderr);
    exit(1);
}

client.c

#include <stdio.h>
#include <stdlib.h>
#include <WinSock2.h>
void ErrorHandling(char* message);

int main(int argc, char* argv[])
{
    WSADATA wsaData;
    SOCKET hSocket;
    SOCKADDR_IN servAddr;

    char message[30];
    int strLen;
    if (argc != 3)
    {
        printf("Usage : %s <IP> <port>
", argv[0]);
        exit(1);
    }

    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
        ErrorHandling("WSAStartup() error!");

    hSocket = socket(PF_INET, SOCK_STREAM, 0);
    if (hSocket == INVALID_SOCKET)
        ErrorHandling("socket() error");

    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_addr.s_addr = inet_addr(argv[1]);
    servAddr.sin_port = htons(atoi(argv[2]));

    if (connect(hSocket, (SOCKADDR *)&servAddr, sizeof(servAddr)) == SOCKET_ERROR)
        ErrorHandling("connect() error!");

    strLen = recv(hSocket, message, sizeof(message) - 1, 0);
    if (strLen == -1)
        ErrorHandling("read() error!");
    printf("Message from server: %s 
", message);

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

void ErrorHandling(char* message)
{
    fputs(message, stderr);
    fputc('
', stderr);
    exit(1);
}

注意，需要在工程属性中设置：链接器-输入-附加依赖项中添加：ws2_32.lib。