C++的UDP测试

服务端

#include <Winsock2.h>
#include <stdio.h>

/*
UDP服务端
*/
void main(){

	//加载嵌套字库
	WORD wVersionRequested;
	WSADATA wsaData;
	int err;
	
	wVersionRequested=MAKEWORD(1,1);
	err=WSAStartup(wVersionRequested,&wsaData);

	if(err!=0){
		return;
	}

	if(LOBYTE(wsaData.wVersion)!=1||HIBYTE(wsaData.wVersion)!=1){
		WSACleanup();
		return;
	}
	
	//创建用于监听的嵌套字
	SOCKET sockSrv=socket(AF_INET,SOCK_DGRAM,0);

	SOCKADDR_IN addrSrv;
	addrSrv.sin_family=AF_INET;
	addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
	addrSrv.sin_port=htons(6000);

	//绑定嵌套字
	bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));


	//等待接受数据
	SOCKADDR_IN addrClient;
	int len=sizeof(SOCKADDR);
	char recv[100];
	recvfrom(sockSrv,recv,100,0,(SOCKADDR*)&addrClient,&len);
	printf("%s\n",recv);
	
	//关闭嵌套字
	closesocket(sockSrv);
	WSACleanup();

}

 

客户端

#include <Winsock2.h>
#include <stdio.h>

void main(){

	//加载嵌套字库
	WORD wVersionRequested;
	WSADATA wsaData;
	int err;
	
	wVersionRequested=MAKEWORD(1,1);
	err=WSAStartup(wVersionRequested,&wsaData);

	if(err!=0){
		return;
	}

	if(LOBYTE(wsaData.wVersion)!=1||HIBYTE(wsaData.wVersion)!=1){
		WSACleanup();
		return;
	}
	
	//创建用于监听的嵌套字
	SOCKET sockClient=socket(AF_INET,SOCK_DGRAM,0);

	SOCKADDR_IN addrSrv;
	addrSrv.sin_family=AF_INET;
	addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
	addrSrv.sin_port=htons(6000);

	//发送数据
	sendto(sockClient,"hello",sizeof("hello"),0,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
	
	//关闭嵌套字
	closesocket(sockClient);
	WSACleanup();
}