Windows下C语言的Socket编程例子（TCP和UDP）

原文: Windows下C语言的Socket编程例子（TCP和UDP）

刚刚学windows编程，所以想写学习笔记，这是一个简单的Socket程序例子，开发环境是vc6：

首先是TCP

server端：

#include "stdafx.h"

#include <stdio.h>

#include <winsock2.h>



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



int main(int argc, char* argv[])

{

	//初始化WSA

	WORD sockVersion = MAKEWORD(2,2);

	WSADATA wsaData;

	if(WSAStartup(sockVersion, &wsaData)!=0)

	{

		return 0;

	}



	//创建套接字

	SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	if(slisten == INVALID_SOCKET)

	{

		printf("socket error !");

		return 0;

	}



	//绑定IP和端口

	sockaddr_in sin;

	sin.sin_family = AF_INET;

	sin.sin_port = htons(8888);

	sin.sin_addr.S_un.S_addr = INADDR_ANY; 

	if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)

	{

		printf("bind error !");

	}



	//开始监听

	if(listen(slisten, 5) == SOCKET_ERROR)

	{

		printf("listen error !");

		return 0;

	}



	//循环接收数据

	SOCKET sClient;

	sockaddr_in remoteAddr;

	int nAddrlen = sizeof(remoteAddr);

	char revData[255]; 

	while (true)

	{

		printf("等待连接...\n");

		sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);

		if(sClient == INVALID_SOCKET)

		{

			printf("accept error !");

			continue;

		}

		printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));

		

		//接收数据

		int ret = recv(sClient, revData, 255, 0);		

		if(ret > 0)

		{

			revData[ret] = 0x00;

			printf(revData);

		}



		//发送数据

		char * sendData = "你好，TCP客户端！\n";

		send(sClient, sendData, strlen(sendData), 0);

		closesocket(sClient);

	}

	

	closesocket(slisten);

	WSACleanup();

	return 0;

}

client端：

#include "stdafx.h"

#include <WINSOCK2.H>

#include <STDIO.H>



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





int main(int argc, char* argv[])

{

	WORD sockVersion = MAKEWORD(2,2);

	WSADATA data; 

	if(WSAStartup(sockVersion, &data) != 0)

	{

		return 0;

	}



	SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	if(sclient == INVALID_SOCKET)

	{

		printf("invalid socket !");

		return 0;

	}



	sockaddr_in serAddr;

	serAddr.sin_family = AF_INET;

	serAddr.sin_port = htons(8888);

	serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); 

	if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)

	{

		printf("connect error !");

		closesocket(sclient);

		return 0;

	}

	char * sendData = "你好，TCP服务端，我是客户端!\n";

	send(sclient, sendData, strlen(sendData), 0);



	char recData[255];

	int ret = recv(sclient, recData, 255, 0);

	if(ret > 0)

	{

		recData[ret] = 0x00;

		printf(recData);

	}

	closesocket(sclient);

	WSACleanup();

	return 0;

}

然后是UDP

server端：

#include "stdafx.h"

#include <stdio.h>

#include <winsock2.h>



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



int main(int argc, char* argv[])

{

	WSADATA wsaData;

	WORD sockVersion = MAKEWORD(2,2);

	if(WSAStartup(sockVersion, &wsaData) != 0)

	{

		return 0;

	}



	SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 

	if(serSocket == INVALID_SOCKET)

	{

		printf("socket error !");

		return 0;

	}



	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)

	{

		printf("bind error !");

		closesocket(serSocket);

		return 0;

	}

	

	sockaddr_in remoteAddr;

	int nAddrLen = sizeof(remoteAddr); 

	while (true)

	{

		char recvData[255];  

		int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen);

		if (ret > 0)

		{

			recvData[ret] = 0x00;

			printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));

			printf(recvData);			

		}



		char * sendData = "一个来自服务端的UDP数据包\n";

		sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen);	



	}

	closesocket(serSocket); 

	WSACleanup();

	return 0;

}

client端：

#include "stdafx.h"

#include <stdio.h>

#include <winsock2.h>



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



int main(int argc, char* argv[])

{

	WORD socketVersion = MAKEWORD(2,2);

	WSADATA wsaData; 

	if(WSAStartup(socketVersion, &wsaData) != 0)

	{

		return 0;

	}

	SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

	

	sockaddr_in sin;

	sin.sin_family = AF_INET;

	sin.sin_port = htons(8888);

	sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

	int len = sizeof(sin);

	

	char * sendData = "来自客户端的数据包.\n";

	sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len);



	char recvData[255]; 	

	int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len);

	if(ret > 0)

	{

		recvData[ret] = 0x00;

		printf(recvData);

	}



	closesocket(sclient);

	WSACleanup();

	return 0;

}

测试是可以通过的，就是不知道有那些地方可以改进，那些地方是可以删除的，如果有人知道可以给我留言。

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