1. 简易TCP客户端服务端(Windows Socket)

Posted 2021-11-07 阿龙亡命天涯

调用Windows下的接口必须先进行初始化，比如：

WORD ver = MAKEWORD(2,2);
WSADATA dat;
WSAStartup(ver,&dat);
//--------------------------------
//这里面的代码和Linux差不多
//--------------------------------
WSACleanup();

服务器：

#define WIN32_LEAN_AND_MEAN//尽量避免、减少早期的库的冲突
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <windows.h>
#include <WinSock2.h>
#include <stdio.h>

int main()
{
	WORD ver = MAKEWORD(2,2);
	WSADATA dat;
	WSAStartup(ver,&dat);
	
	//---------------------------------------------------------------------
	//1. 建立一个socket套接字
	SOCKET _sock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	//2. bind绑定用于接受客户端连接的网络端口
	sockaddr_in _sin = {};
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
	_sin.sin_addr.S_un.S_addr = INADDR_ANY;
	if (SOCKET_ERROR == bind(_sock, (sockaddr*)&_sin, sizeof(_sin)))
	{
		printf("ERROR,绑定用于接受客户端连接的网络端口失败...\\n");
	}
	else
	{
		printf("绑定成功...\\n");
	}

	//3. 监听网络端口
	if (SOCKET_ERROR == listen(_sock, 5))//最多5个人
	{
		printf("错误，监听网络端口失败...\\n");
	}
	else
	{
		printf("监听网络端口成功...\\n");
	}

	//4. accept等待接受客户端连接
	sockaddr_in clientAddr = {};
	int nAddrLen = sizeof(sockaddr_in);
	SOCKET _cSock = INVALID_SOCKET;

	_cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
	if (INVALID_SOCKET == _cSock)
	{
		printf("错误，接收到无效客户端SOCKET...\\n");
	}
	printf("新客户端加入：socket = %d IP = %s \\n", (int)_cSock,inet_ntoa(clientAddr.sin_addr));
	
	char _recvBuf[128] = {};
	while (true)
	{
		//5. 接受客户端数据
		int nLen = recv(_cSock, _recvBuf, 128, 0);
		if(nLen <= 0)
		{
			printf("客户端已退出，任务结束。");
			break;
		}
		printf("收到命令：%s \\n",_recvBuf);
		//6. 处理请求
		if (0 == strcmp(_recvBuf,"getName"))
		{
			//7. 发送数据
			char msgBuf[] = "Dragon";
			send(_cSock,msgBuf,strlen(msgBuf)+1,0);
		}
		else if (0 == strcmp(_recvBuf, "getAge"))
		{
			//7. 发送数据
			char msgBuf[] = "21";
			send(_cSock, msgBuf, strlen(msgBuf) + 1, 0);
		}
		else
		{
			char msgBuf[] = "???";
			send(_cSock, msgBuf, strlen(msgBuf) + 1, 0);
		}
	}
	//8. 关闭套接字closesocket
	closesocket(_sock);
	//------------------------------------------------------------------------
	WSACleanup();
	printf("任务结束，退出");
	getchar();
	return 0;
}

客户端：

#define WIN32_LEAN_AND_MEAN//尽量避免、减少早期的库的冲突
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
//#pragma comment(lib,"ws2_32.lib")
#include <windows.h>
#include <WinSock2.h>

#include <stdio.h>


int main()
{
	WORD ver = MAKEWORD(2, 2);
	WSADATA dat;
	WSAStartup(ver, &dat);
	//-------------------------
	//1. 建立一个socket
	SOCKET _sock = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == _sock)
	{
		printf("错误，建立Socket失败...\\n");
	}
	else
	{
		printf("建立Socket成功...\\n");
	}
	//2. 连接服务器 connect
	sockaddr_in _sin = {};//初始化
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
	_sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	int ret = connect(_sock, (sockaddr*)(&_sin), sizeof(sockaddr_in));
	if (SOCKET_ERROR == ret)
	{
		printf("连接服务器失败...\\n");
	}
	else
	{
		printf("连接服务器成功...\\n");
	}
	
	while (true)
	{
		//3. 输入请求命令
		char cmdBuf[128] = {};
		scanf("%s",cmdBuf);
		//4. 处理请求命令
		if (0 == strcmp(cmdBuf, "exit"))
		{
			printf("收到exit，任务结束");
			break;
		}
		else
		{
			//5. 向服务器发送请求
			send(_sock, cmdBuf, strlen(cmdBuf) + 1, 0);
		}

		//6. 接受服务器信息recv
		char recvBuf[128] = {};
		int nlen = recv(_sock, recvBuf, 128, 0);
		if (nlen > 0)
		{
			printf("接受到的数据：%s \\n", recvBuf);
		}
	}
	
	//7. 关闭套接字closesocket
	closesocket(_sock);

	//-------------------------
	//清除windows socket环境
	WSACleanup();
	printf("已退出");
	getchar();
	return 0;
}

测试：