DEVC++ 聊天室

DEVC++是一个C++的集成开发环境，可以用来编写C++程序。下面是一个用DEVC++编写的简单聊天室的例子：

服务端代码：

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

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

#define BUF_SIZE 100
#define NAME_SIZE 20

void ErrorHandling(char *message);

int main(int argc, char *argv[])
{
    WSADATA wsaData;
    SOCKET hServSock, hClntSock;
    SOCKADDR_IN servAdr, clntAdr;
    int szClntAdr;
    char message[BUF_SIZE];
    int strLen, i;

    if (argc != 2) {
        printf("Usage : %s <port>\n", 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(&servAdr, 0, sizeof(servAdr));
    servAdr.sin_family = AF_INET;
    servAdr.sin_addr.s_addr = htonl(INADDR_ANY);
    servAdr.sin_port = htons(atoi(argv[1]));

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

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

    szClntAdr = sizeof(clntAdr);

    for (i = 0; i < 5; i++) {
        hClntSock = accept(hServSock, (SOCKADDR*)&clntAdr, &szClntAdr);
        if (hClntSock == INVALID_SOCKET)
            ErrorHandling("accept() error!");
        else
            printf("Connected client %d \n", i + 1);

        while ((strLen = recv(hClntSock, message, BUF_SIZE, 0)) != 0)
            send(hClntSock, message, strLen, 0);

        closesocket(hClntSock);
        printf("Closed client %d \n", i + 1);
    }

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

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

客户端代码：

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

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

#define BUF_SIZE 100
#define NAME_SIZE 20

void ErrorHandling(char *message);

int main(int argc, char *argv[])
{
    WSADATA wsaData;
    SOCKET hSocket;
    SOCKADDR_IN servAdr;
    char message[BUF_SIZE];
    int strLen;

    if (argc != 3) {
        printf("Usage : %s <IP> <port>\n", 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(&servAdr, 0, sizeof(servAdr));
    servAdr.sin_family = AF_INET;
    servAdr.sin_addr.s_addr = inet_addr(argv[1]);
    servAdr.sin_port = htons(atoi(argv[2]));

    if (connect(hSocket, (SOCKADDR*)&servAdr, sizeof(servAdr)) == SOCKET_ERROR)
        ErrorHandling("connect() error!");
    else
        puts("Connected...........");

    while (1) {
        fputs("Input message(Q to quit): ", stdout);
        fgets(message, BUF_SIZE, stdin);

        if (!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
            break;

        send(hSocket, message, strlen(message), 0);
        strLen = recv(hSocket, message, BUF_SIZE - 1, 0);
        message[strLen] = 0;
        printf("Message from server: %s", message);
    }

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

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

运行方法：
1.在DEVC++中新建两个工程，一个是服务端，一个是客户端。
2.将上述代码分别复制到服务端和客户端的源文件中。
3.编译并运行服务端和客户端。