Socket通信之TCP通信

实现一个简单的server和client收发消息的程序，能互相收发，不过收到之后要先回才能继续收，同样发了之后要等待收到才能继续发

上代码：

server端：

#include <iostream>
#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")   //静态加入一个lib文件
using namespace std;
int main()
{
	WORD sockVersion = MAKEWORD(2, 2);  
	WSADATA wsaData;   
	if (WSAStartup(sockVersion, &wsaData) != 0) //WSAStartup返回0表示设置初始化成功	
		return 0; 		
	/*创建套接字*/	
	//AF_INET表示IPv4，SOCK_STREAM数据传输方式，IPPROTO_TCP传输协议;	
	SOCKET listenSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);	
	if (listenSocket == INVALID_SOCKET)	
	{		
		printf("套接字创建失败");		
		WSACleanup();		
		return 0;	
	}
	/*绑定IP和端口*/
	//配置监听地址和端口
	sockaddr_in addrListen;
	addrListen.sin_family = AF_INET;     //指定IP格式
	addrListen.sin_port = htons(8888);   //绑定端口号
	addrListen.sin_addr.S_un.S_addr = INADDR_ANY;  //表示任何IP   service.sin_addr.s_addr = inet_addr("127.0.0.1");
	if (bind(listenSocket, (SOCKADDR*)&addrListen, sizeof(addrListen)) == SOCKET_ERROR)  //(SOCKADDR*)
	{
		printf("绑定失败");
		closesocket(listenSocket);
		return 0;
	}

	/*开始监听*/
	if (listen(listenSocket, 5) == SOCKET_ERROR)
	{
		printf("监听出错");
		closesocket(listenSocket);
		return 0;
	}

	/*等待连接，连接后建立一个新的套接字*/
	SOCKET revSocket;  //对应此时所建立连接的套接字的句柄
	sockaddr_in remoteAddr;   //接收连接到服务器上的地址信息
	int remoteAddrLen = sizeof(remoteAddr);
	printf("等待连接...\n");
	/*等待客户端请求，服务器接收请求*/
	revSocket = accept(listenSocket, (SOCKADDR*)&remoteAddr, &remoteAddrLen);  //等待客户端接入，直到有客户端连接上来为止
	if (revSocket == INVALID_SOCKET)
	{
		printf("客户端发出请求，服务器接收请求失败：\n", WSAGetLastError());
		closesocket(listenSocket);
		WSACleanup();
		return 0;
	}
	else
	{
		printf("客服端与服务器建立连接成功：%s \n", inet_ntoa(remoteAddr.sin_addr));
	}
	char revData[255] = "";
	char *sendData = new char[100];
	/*通过建立的连接进行通信*/
	int res = recv(revSocket, revData, 255, 0);
	if (res > 0)
	{
		printf("Bytes received: %d\n", res);
		printf("客户端发送的数据: %s\n", revData);
	}
	else if (res == 0)
		printf("Connection closed\n");
	else
		printf("recv failed: %d\n", WSAGetLastError());

	while (cin >> sendData)
	{
		//cout << strlen(sendData) << endl;
		memset(revData, 0, sizeof(revData));
		if (strcmp(sendData, "q") == 0)
		{
			printf("服务器停止发送数据！\n");
			break;
		}
		//发送数据
		send(revSocket, sendData, strlen(sendData), 0);
		res = recv(revSocket, revData, 255, 0);
		if (res > 0)
		{
			printf("Bytes received: %d\n", res);
			printf("客户端发送的数据: %s\n", revData);
		}
	}

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

client端：

#include <iostream>
#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")   //静态加入一个lib文件
using namespace std;
int main()
{

	WORD sockVerson = MAKEWORD(2, 2);
	WSADATA wsaData;
	if (WSAStartup(sockVerson, &wsaData) != 0)
		return 0;
	//建立客户端socket
	SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (clientSocket == INVALID_SOCKET)
	{
		printf("套接字创建失败");
		WSACleanup();
		return 0;
	}

	//定义要连接的服务器地址
	sockaddr_in addrConServer;
	addrConServer.sin_family = AF_INET;
	addrConServer.sin_port = htons(8888);
	addrConServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	if (connect(clientSocket, (SOCKADDR*)&addrConServer, sizeof(addrConServer)) == SOCKET_ERROR)
	{
		printf("客户端建立连接失败！\n");
		closesocket(clientSocket);
		WSACleanup();
		return 0;
	}
	else
		printf("客户端建立连接成功，准备发送数据！\n");

	//发送数据
	char *sendBuf = "Hello server, I am client";
	int sendRes = send(clientSocket, sendBuf, (int)strlen(sendBuf), 0);
	if (sendRes == SOCKET_ERROR)
	{
		printf("客户端send()出现错误 : %d\n", WSAGetLastError());
		closesocket(clientSocket);
		WSACleanup();
		return 0;
	}
	else
		printf("客户端发送数据成功!\n");
	//接收服务端数据
	/*通过建立的连接进行通信*/
	int res = 0;
	char *sendData = new char[100];
	do
	{
		char revSerData[100] = "";
		res = recv(clientSocket, revSerData, sizeof(revSerData), 0);
		if (res > 0)
		{
			printf("Bytes received: %d\n", res);
			printf("服务器发送的数据: %s\n", revSerData);
		}
		else if (res == 0)
			printf("Connection closed\n");
		else
			printf("recv failed: %d\n", WSAGetLastError());

		//cout << strlen(sendData) << endl;
		cin >> sendData;
		if (strcmp(sendData, "q") == 0)
		{
			printf("客户端停止发送数据！\n");
			break;
		}
		//发送数据
		send(clientSocket, sendData, strlen(sendData), 0);

	} while (res > 0);

	closesocket(clientSocket);
	WSACleanup();
}