一、介绍

tcp和udp的区别之一，即tcp是有连接的，udp是无连接的，udp收发数据的代码可以独立运行，tcp发数据前必须确保收数据的一方是打开的，否则无法建立连接。

二、收数据

tcpRecv.h

#pragma once
#include<iostream>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")
using namespace std;

class tcpRecv
{
public:
	tcpRecv();
	~tcpRecv();
	void initialization();
	void recvData();
public:
	//定义发送缓冲区和接受缓冲区
	char send_buf[100];
	char recv_buf[100];
	//定义服务端套接字，接受请求套接字
	SOCKET s_server;
	SOCKET s_accept;
	//服务端地址客户端地址
	SOCKADDR_IN server_addr;
	SOCKADDR_IN accept_addr;
};

tcpRecv.cpp

#include "tcpRecv.h"

tcpRecv::tcpRecv()
{
	initialization();
	//填充服务端信息
	server_addr.sin_family = AF_INET;
	server_addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	server_addr.sin_port = htons(14555);
	//创建套接字
	s_server = socket(AF_INET, SOCK_STREAM, 0);
	if (bind(s_server, (SOCKADDR *)&server_addr, sizeof(SOCKADDR)) == SOCKET_ERROR) {
		cout << "套接字绑定失败！" << endl;
		WSACleanup();
	}
	else {
		cout << "套接字绑定成功！" << endl;
	}
	//设置套接字为监听状态
	if (listen(s_server, SOMAXCONN) < 0) {
		cout << "设置监听状态失败！" << endl;
		WSACleanup();
	}
	else {
		cout << "设置监听状态成功！" << endl;
	}
	cout << "服务端正在监听连接，请稍候...." << endl;
	//接受连接请求
	int len = sizeof(SOCKADDR);
	s_accept = accept(s_server, (SOCKADDR *)&accept_addr, &len);
	if (s_accept == SOCKET_ERROR) {
		cout << "连接失败！" << endl;
		WSACleanup();
	}
	cout << "连接建立，准备接受数据" << endl;
}


tcpRecv::~tcpRecv()
{
	//关闭套接字
	closesocket(s_server);
	closesocket(s_accept);
	//释放DLL资源
	WSACleanup();
}


void tcpRecv::initialization() {
	//初始化套接字库
	WORD w_req = MAKEWORD(2, 2);//版本号
	WSADATA wsadata;
	int err;
	err = WSAStartup(w_req, &wsadata);
	if (err != 0) {
		cout << "初始化套接字库失败！" << endl;
	}
	else {
		cout << "初始化套接字库成功！" << endl;
	}
	//检测版本号
	if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wHighVersion) != 2) {
		cout << "套接字库版本号不符！" << endl;
		WSACleanup();
	}
	else {
		cout << "套接字库版本正确！" << endl;
	}
	//填充服务端地址信息

}

void tcpRecv::recvData() {
	//接收数据
	int recv_len = recv(s_accept, recv_buf, 100, 0);
	if (recv_len < 0) {
		cout << "接受失败！" << endl;
	}
	else {
		cout << "接收信息为:" << recv_buf << endl;
	}
}

main.cpp

#include "tcpRecv.h"

int main() {
	tcpRecv tcp;
	while (1) {
		tcp.recvData();
	}
	return 0;
}

三、发数据

tcpSend.h

#pragma once
#include<iostream>
#include<string>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")
using namespace std;

class tcpSend
{
public:
	tcpSend();
	~tcpSend();
	void initialization();
	void sendData(std::string&data);
public:
	//定义服务端套接字，接受请求套接字
	SOCKET s_server;
	//服务端地址客户端地址
	SOCKADDR_IN server_addr;
};

tcpSend.cpp

#include "tcpSend.h"

tcpSend::tcpSend()
{
	initialization();
	//填充服务端信息
	server_addr.sin_family = AF_INET;
	server_addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	server_addr.sin_port = htons(14555);
	//创建套接字
	s_server = socket(AF_INET, SOCK_STREAM, 0);
	if (connect(s_server, (SOCKADDR *)&server_addr, sizeof(SOCKADDR)) == SOCKET_ERROR) {
		cout << "服务器连接失败！" << endl;
		WSACleanup();
	}
	else {
		cout << "服务器连接成功！" << endl;
	}
}


tcpSend::~tcpSend()
{
	//关闭套接字
	closesocket(s_server);
	//释放DLL资源
	WSACleanup();
}

void tcpSend::initialization() {
	//初始化套接字库
	WORD w_req = MAKEWORD(2, 2);//版本号
	WSADATA wsadata;
	int err;
	err = WSAStartup(w_req, &wsadata);
	if (err != 0) {
		cout << "初始化套接字库失败！" << endl;
	}
	else {
		cout << "初始化套接字库成功！" << endl;
	}
	//检测版本号
	if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wHighVersion) != 2) {
		cout << "套接字库版本号不符！" << endl;
		WSACleanup();
	}
	else {
		cout << "套接字库版本正确！" << endl;
	}
	//填充服务端地址信息

}

void tcpSend::sendData(std::string&data) {
	int send_len = send(s_server, data.c_str(), sizeof(data), 0);
	if (send_len < 0) {
		cout << "发送失败！" << endl;
	}
	else {
		std::cout << "send data：" << data.c_str() << std::endl;
	}

}

main.cpp

#include "tcpSend.h"

int main() {
	tcpSend tcp;
	for (int i = 0; i < 100; i++) {
		std::string s = "test " + std::to_string(i);
		tcp.sendData(s);
		Sleep(1000);
	}
	return 0;
}

TCP收发信息（C++）

一、介绍

二、收数据

三、发数据

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