问题标题: Socket联机程序教程1~2

有空就连载

王牌工作室官方在2022-06-27 15:19:58追加了内容

一,基本数据发送

第1课 : 一对一连接 - 服 务 器

先在编译设置里添加-lwsock32

再输入基本头文件和常量

#include <WINSOCK2.H>
#include <stdio.h>
#define PORT           5150
#define MSGSIZE        1024

那个5150可以改,但不要改成80,也不要和别的程序冲突(比如和其他联机程序相同),那是端口号

写上main函数,开始

初始化变量

    WSADATA wsaData;
	SOCKET sListen;
	SOCKET sClient;
	SOCKADDR_IN local;
	SOCKADDR_IN client;
	char szMessage[MSGSIZE];
	int ret;
	int iaddrSize = sizeof(SOCKADDR_IN);

注意wsaData,szMessage和sClient变量,这几个要用到

来初始化一下

	WSAStartup(0x0202, &wsaData);
	sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	local.sin_family = AF_INET;
	local.sin_port = htons(PORT);
	local.sin_addr.s_addr = htonl(INADDR_ANY);
	bind(sListen, (struct sockaddr *) &local, sizeof(SOCKADDR_IN));
	listen(sListen, 1);

现在可以连接客户端了

	sClient = accept(sListen, (struct sockaddr *) &client, &iaddrSize);
	printf("Accepted client:%s:%d\n", inet_ntoa(client.sin_addr),ntohs(client.sin_port));//本行可选

不断接受消息

    while(1)
	{
		ret = recv(sClient, szMessage, MSGSIZE, 0);
		szMessage[ret] = '\0';
		printf("Received [%d bytes]: '%s'\n", ret, szMessage);
	}

本课全部代码:

#include <WINSOCK2.H>
#include <stdio.h>
#define PORT           5150
#define MSGSIZE        1024
int main()
{
	WSADATA wsaData;
	SOCKET sListen;
	SOCKET sClient;
	SOCKADDR_IN local;
	SOCKADDR_IN client;
	char szMessage[MSGSIZE];
	int ret;
	int iaddrSize = sizeof(SOCKADDR_IN);
	WSAStartup(0x0202, &wsaData);
	sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	local.sin_family = AF_INET;
	local.sin_port = htons(PORT);
	local.sin_addr.s_addr = htonl(INADDR_ANY);
	bind(sListen, (struct sockaddr *) &local, sizeof(SOCKADDR_IN));
	listen(sListen, 1);
	sClient = accept(sListen, (struct sockaddr *) &client, &iaddrSize);
	printf("Accepted client:%s:%d\n", inet_ntoa(client.sin_addr),ntohs(client.sin_port));
	while (TRUE)
	{
		ret = recv(sClient, szMessage, MSGSIZE, 0);
		szMessage[ret] = '\0';
		printf("Received [%d bytes]: '%s'\n", ret, szMessage);
	}
	return 0;
}

王牌工作室官方在2022-06-27 15:28:10追加了内容

第1课 : 一对一连接 - 客 户 端

头部:

#include <WINSOCK2.H>
#include <stdio.h>
#define SERVER_ADDRESS "127.0.0.1"
#define PORT           5150
#define MSGSIZE        1024

一样,PORT可以改,但必须和服 务 器的PORT一样

SERVER_ADDRESS也可以改,这是服 务 器的IP地址(必须连接在同一个网络)

变量

	WSADATA wsaData;
	SOCKET sClient;
	SOCKADDR_IN server;
	char szMessage[MSGSIZE];
	int ret;

初始化

	WSAStartup(0x0202, &wsaData);
	sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	memset(&server, 0, sizeof(SOCKADDR_IN));
	server.sin_family = PF_INET;
	server.sin_port = htons(PORT);
	server.sin_addr.s_addr = inet_addr(SERVER_ADDRESS);

连接

	connect(sClient, (struct sockaddr *) &server, sizeof(SOCKADDR_IN));

不断发送

	while(1)
	{
		printf("Send:");
		gets(szMessage);
		if(strcmp(szMessage,"**exit**")==0) break;
		send(sClient, szMessage, strlen(szMessage), 0);
	}

清理

	closesocket(sClient);
	WSACleanup();

这两课的代码含义在以后会讲,现在只要知道就行了

王牌工作室官方在2022-06-27 15:29:22追加了内容

完整代码

#include <WINSOCK2.H>
#include <stdio.h>
#define SERVER_ADDRESS "127.0.0.1"
#define PORT           5150
#define MSGSIZE        1024
int main()
{
	WSADATA wsaData;
	SOCKET sClient;
	SOCKADDR_IN server;
	char szMessage[MSGSIZE];
	int ret;
	WSAStartup(0x0202, &wsaData);
	sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	memset(&server, 0, sizeof(SOCKADDR_IN));
	server.sin_family = PF_INET;
	server.sin_port = htons(PORT);
	server.sin_addr.s_addr = inet_addr(SERVER_ADDRESS);
	connect(sClient, (struct sockaddr *) &server, sizeof(SOCKADDR_IN));
	while(1)
	{
		printf("Send:");
		gets(szMessage);
		if(strcmp(szMessage,"**exit**")==0) break;
		send(sClient, szMessage, strlen(szMessage), 0);
	}
	closesocket(sClient);
	WSACleanup();
	return 0;
}