简单UDP服务器端和客户端(源代码)

//客户端

#include <iostream>
#include <stdio.h>
#include <windows.h>
#include <string.h>

using namespace std;

#pragma comment(lib, "WS2_32.lib")


class CInitSock
{
public:
	CInitSock(int version01 = 2, int versiont02 = 2)
	{
		WORD sockVersion = MAKEWORD(2, 2);
		WSADATA wsaData = {0}; 

		if (WSAStartup(sockVersion, &wsaData) != 0)
		{
			cout << "initlization failed!" << endl;

			exit(0);
		}

	}

	~CInitSock()
	{
		WSACleanup();
	}
};

CInitSock mysock;


int const MAX_SIZE = 1024;

int main()
{
	char buffer[MAX_SIZE] = "\0";
	sockaddr_in addr = {0};
	int nLen  = sizeof(sockaddr_in);
	SOCKET s;

	addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	addr.sin_family = AF_INET;
	addr.sin_port  = htons(4567);
	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

	while (true)
	{
		cout << "Please input send data: " << endl;
		cin >> buffer;

		if ((strcmp(buffer, "quit") == 0) || (strcmp(buffer, "exit")) == 0)
		{
			cout << "process exit...." << endl;

			break;
		}

		sendto(s, buffer, strlen(buffer), 0, (sockaddr*)&addr, sizeof(addr));
	}
} 

 //服务器端

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

using namespace std;

#pragma comment(lib, "WS2_32.lib")


class CInitSock
{
public:
	CInitSock(int version01 = 2, int versiont02 = 2)
	{
		WORD sockVersion = MAKEWORD(2, 2);
		WSADATA wsaData = {0}; 

		if (WSAStartup(sockVersion, &wsaData) != 0)
		{
			cout << "initlization failed!" << endl;

			exit(0);
		}

	}

	~CInitSock()
	{
		WSACleanup();
	}
};

CInitSock mysock;

int main()
{
	SOCKET  s = 0;
	sockaddr_in sin = {0}; 

	sin.sin_family = AF_INET;
	sin.sin_port = htons(4567);
	sin.sin_addr.S_un.S_addr = INADDR_ANY;

	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

	if (bind(s, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
	{
		cout << "bind failed!" << endl;

		return 0;
	}

	char  buffer[1024] = "\0";
	sockaddr_in addr  = {0};
	int  nLen  = 0;

	nLen = sizeof(sockaddr_in);

	cout << "------- now service start -------------" << endl;

	while (true)
	{
		int nRecv = 0;

		cout << "wait to receive data............" << endl;

		nRecv = recvfrom(s, buffer, 1024, 0, (sockaddr*)&addr, &nLen);

		if (nRecv > 0)
		{
			buffer[nRecv] = '\0';

			cout << "receve buffer: " << buffer << endl;
		}
	}

	closesocket(s);
}