UDP多线程同时建立多个通信端口

1.需要注意的是： ::bind(serSocket, (sockaddr*)&serAddr, sizeof(serAddr)) == SOCKET_ERROR) ，bind()函数前必须添加::,否则，在使用thread头文件后， 使用了using namespace std的情况下，会被默认成std::bind，导致编译失败

（1）server

#include
#include
#include 
using namespace std;
#pragma comment(lib,"ws2_32.lib")
//初始化socket资源 

int gFlag = -1;
void threadFunc()
{
	WSADATA WSAData;
	WORD sockVersion = MAKEWORD(2, 2);
	if (WSAStartup(sockVersion, &WSAData) != 0)
		return ;
	SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);	//创建服务器socket
	if (INVALID_SOCKET == serSocket)
	{
		cout << "socket error!";
		return ;
	}

	//设置传输协议、端口以及目的地址 
	sockaddr_in serAddr;
	serAddr.sin_family = AF_INET;
	serAddr.sin_port = htons(8888);
	serAddr.sin_addr.S_un.S_addr = INADDR_ANY;

	if (::bind(serSocket, (sockaddr*)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)	 //将socket绑定地址 
	{
		cout << "bind error";
		closesocket(serSocket);
		return ;
	}

	sockaddr_in clientAddr;
	int iAddrlen = sizeof(clientAddr);
	char buff[1024];	//建立接收缓存字节数组 

	while(true)
	{
		memset(buff, 0, 1024);	//清空接收缓存数组
		//开始接收数据 
		int len = recvfrom(serSocket, buff, 1024, 0, (sockaddr*)&clientAddr, &iAddrlen);
		if (len > 0)
		{
			cout << "客户端地址：" << inet_ntoa(clientAddr.sin_addr) << endl;
			cout << buff;
			std::string str_buff = buff;

			//if(str_buff.compare("来自客户端的数据包。\n") == 0)
			if (buff == "来自客户端的数据包。\n")
			{
				std::cout << "OK" << std::endl;
			}
			gFlag = 1;
			//	sendto(serSocket,buff,1024,0,(sockaddr*)&clientAddr,iAddrlen);
		}
	}
	closesocket(serSocket);		//关闭socket 
	WSACleanup();
}
void threadFunc2()
{
	WSADATA WSAData;
	WORD sockVersion = MAKEWORD(2, 2);
	if (WSAStartup(sockVersion, &WSAData) != 0)
		return;
	SOCKET serSocket2 = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);	//创建服务器socket
	if (INVALID_SOCKET == serSocket2)
	{
		cout << "socket2 error!";
		return ;
	}

	//设置传输协议、端口以及目的地址 
	sockaddr_in serAddr2;
	serAddr2.sin_family = AF_INET;
	serAddr2.sin_port = htons(3333);
	serAddr2.sin_addr.S_un.S_addr = INADDR_ANY;

	if (::bind(serSocket2, (sockaddr*)&serAddr2, sizeof(serAddr2)) == SOCKET_ERROR)	 //将socket绑定地址 
	{
		cout << "bind error";
		closesocket(serSocket2);
		return ;
	}

	sockaddr_in clientAddr2;
	int iAddrlen2 = sizeof(clientAddr2);
	char buff2[1024];	//建立接收缓存字节数组 






	while (true)
	{
		memset(buff2, 0, 1024);	//清空接收缓存数组
		//开始接收数据 
		int len2 = recvfrom(serSocket2, buff2, 1024, 0, (sockaddr*)&clientAddr2, &iAddrlen2);
		if (len2 > 0)
		{
			cout << "客户端地址2：" << inet_ntoa(clientAddr2.sin_addr) << endl;
			cout << buff2;
			if (gFlag == 2)
			{
				gFlag = 3;
			}
			//	sendto(serSocket,buff,1024,0,(sockaddr*)&clientAddr,iAddrlen);
		}

	}

	closesocket(serSocket2);		//关闭socket 
	WSACleanup();
}
void threadFun3()
{
	while(true)
	{
		if(gFlag == 1)
		{
			gFlag = 2;
		}
		printf("gFlag :%d\n",gFlag);
		Sleep(1000);
	}
}
int main()
{
	

	std::thread thread1(threadFunc);
	std::thread thread2(threadFunc2);
	std::thread thread3(threadFun3);
	thread1.join();
	thread2.join();
	thread3.join();

		

	return 0;
}

（2）client

#include
#include
using namespace std;
#pragma comment(lib,"ws2_32.lib")

int main()
{
	WSADATA WSAData;
	WORD sockVersion = MAKEWORD(2, 2);
	if (WSAStartup(sockVersion, &WSAData) != 0)
		return 0;

	SOCKET clientSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (INVALID_SOCKET == clientSocket)
	{
		cout << "socket error!";
		return 0;
	}

	sockaddr_in dstAddr;
	dstAddr.sin_family = AF_INET;
	dstAddr.sin_port = htons(8888);
	dstAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

	const char* sendData = "heartbeat";
	while(1)
	{
		sendto(clientSocket, sendData, strlen(sendData), 0, (sockaddr*)&dstAddr, sizeof(dstAddr));
		Sleep(500);
	}
	

	closesocket(clientSocket);
	WSACleanup();

	return 0;
}