基于udp协议的字符串计数【网络程序设计

udp_server.c

#include <stdio.h>
#include <winsock2.h>
 
#pragma comment(lib, "ws2_32.lib") 
typedef struct sockaddr_in sockaddr_in ;
typedef struct sockaddr sockaddr;

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 (1)
	{
		char recvData[255];  
		int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen);
		//puts(recvData); 
		if (ret > 0)
		{
			recvData[ret] = 0x00;			
			printf("接受到一个连接：%s 
", inet_ntoa(remoteAddr.sin_addr));
			printf(recvData);
			puts("");			
		}
		int temp=strlen(recvData);
		char sendData[255];
		sprintf(sendData,"%d",temp);
		//char * sendData = "一个来自服务端的UDP数据包
";
		sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen);	
 
	}
	closesocket(serSocket); 
	WSACleanup();
	return 0;
}

udp_client.c

#include <stdio.h>
#include <winsock2.h>

#pragma comment(lib, "ws2_32.lib")
typedef struct sockaddr_in sockaddr_in ;
typedef struct sockaddr sockaddr ;

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[256];
	while(1)
	{		
		 gets(sendData);
		 //"来自客户端的数据包.
";
		 if(strcmp(sendData,"quit")==0)
			 break;
		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);
			puts("");
		}

	}


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