C/C++简单网络通信程序

最新推荐文章于 2025-06-16 19:16:38 发布

Tony_Xian

最新推荐文章于 2025-06-16 19:16:38 发布

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本文提供了一个简单的跨平台TCP服务器和客户端实现示例，分别适用于Windows和Linux环境。服务器端负责发送“Hello World!”消息，而客户端接收并显示该消息。示例代码涵盖了从套接字创建到错误处理的所有步骤。

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Windows下:

server:

#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>\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(&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 *)&servAddr, &szClntAddr);
	if (hClntSock == INVALID_SOCKET)
		ErrorHandling("accept() error");

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

}

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

client:

#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>\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(&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 \n", message);

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

}

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

linux下:

server:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
void error_handling(char *message);
 
 int main(int argc, char *argv[])
 {
     int serv_sock;
     int clnt_sock;

     struct sockaddr_in serv_addr;
     struct sockaddr_in clnt_addr;
     socklen_t clnt_addr_size;

     char message[] = "Hello World!";
 
     if(argc != 2)
     {
         printf("Usage : %s <port>\n");
         exit(1);
     }
 
     serv_sock = socket(PF_INET, SOCK_STREAM, 0);
     if(serv_sock == -1)
         error_handling("socket() error ");

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

     if(bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1)
         error_handling("bind() error");
 
     if(listen(serv_sock, 5) == -1)
         error_handling("listen() error");

     clnt_addr_size = sizeof(clnt_addr);
     clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
     if(clnt_sock == -1)
         error_handling("accept() error");

     write(clnt_sock, message, sizeof(message));
     close(clnt_sock);
     close(serv_sock);
     return 0;
}


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

client:

include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<arpa/inet.h>
#include<sys/socket.h>
void error_handling(char *message);

int main(int argc, char *argv[])
{
    int sock;
    struct sockaddr_in serv_addr;
    char message[30];
    int str_len;

    if(argc != 3)
    {
        printf("Usage : %s <IP> <port>\n", argv[0]);
    }

    sock = socket(PF_INET, SOCK_STREAM, 0);
    if(sock == -1)
        error_handling("socket() error");

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

    if(connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
        error_handling("conncet() error");

    str_len = read(sock, message, sizeof(message) - 1);
    if(str_len == -1)
        error_handling("read error");

    printf("Message from server : %s \n", message);
    close(sock);
    return 0;
 
}
 
void error_handling(char *message)
{
    fputs(message, stderr);
    fputs((char *)'\n', stderr);
    exit(1);
}