Windows下C++ 简单客户端与服务器编程

 服务器代码

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS

#include <windows.h>
#include <WinSock2.h>
#include <stdio.h>

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

int main()
{
	// 启动Windows socket 2.x环境
	WORD ver = MAKEWORD(2, 2);
	WSADATA dat;
	WSAStartup(ver, &dat);
	//----------------

	// --用Socket API建立简易TCP服务器
	// 创建一个socket
	SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	// 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(9527);
	_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("绑定端口成功...\n");

	// 监听端口
	if (SOCKET_ERROR == listen(_sock, 5))
		printf("监听网络端口失败...\n");
	else
		printf("监听网络端口成功...\n");

	// 接收客户端连接
	sockaddr_in clientAddr = {};
	int nAddrLen = sizeof(sockaddr_in);
	SOCKET _cSock = INVALID_SOCKET;
	

	// 向客户端发送一条数据
	char msgBuf[] = "Hello, I'm Server.";
	while (true) {
		_cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
		if (INVALID_SOCKET == _cSock)
			printf("接受到无效客户端SOCKET...\n");
		printf("新客户端加入:IP = %s\n", inet_ntoa(clientAddr.sin_addr));
		send(_cSock, msgBuf, sizeof(msgBuf), 0);
	}
	closesocket(_sock);
	WSACleanup();
	return 0;
}

客户端代码

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS

#include <windows.h>
#include <WinSock2.h>
#include <stdio.h>

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

int main()
{
	// 启动Windows socket 2.x环境
	WORD ver = MAKEWORD(2, 2);
	WSADATA dat;
	WSAStartup(ver, &dat);
	//----------------
	// 建立一个socket
	SOCKET _sock = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == _sock)
		printf("创建套接字错误...\n");
	// 连接服务器 connect
	sockaddr_in _sin = {};
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(9527);
	_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("连接服务器错误...\n");
	else
		printf("连接Socket成功...\n");

	// 接受服务器信息
	char recvBuf[256] = {};
	int nlen = recv(_sock, recvBuf, 256, 0);
	if (nlen > 0)
		printf("接受到数据:%s\n", recvBuf);

	// 关闭套接字
	closesocket(_sock);
	WSACleanup();
	return 0;
}