在C++中实现UDP发送和接收可以使用socket编程

来源：佚名编辑：佚名

2024-02-29 14:36:08

在C++中实现UDP发送和接收可以使用socket编程。下面是一个简单的示例代码：

发送UDP数据包：

#include<iostream>
#include<string>
#include<cstring>
#include<unistd.h>
#include<sys/socket.h>
#include<netinet/in.h>

intmain(){
intsockfd;
structsockaddr_inserverAddr;

//创建UDPsocket
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0){
std::cerr<<"Failedtocreatesocket"<<std::endl;
return-1;
}

//设置服务器地址和端口
serverAddr.sin_family=AF_INET;
serverAddr.sin_port=htons(12345);
serverAddr.sin_addr.s_addr=inet_addr("127.0.0.1");

//发送数据
std::stringmessage="Hello,UDP!";
sendto(sockfd,message.c_str(),message.length(),0,(structsockaddr*)&serverAddr,sizeof(serverAddr));

close(sockfd);

return0;
}

接收UDP数据包：

#include<iostream>
#include<string>
#include<cstring>
#include<unistd.h>
#include<sys/socket.h>
#include<netinet/in.h>

intmain(){
intsockfd;
structsockaddr_inserverAddr,clientAddr;
socklen_taddrLen=sizeof(clientAddr);
charbuffer[1024];

//创建UDPsocket
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0){
std::cerr<<"Failedtocreatesocket"<<std::endl;
return-1;
}

//设置服务器地址和端口
serverAddr.sin_family=AF_INET;
serverAddr.sin_port=htons(12345);
serverAddr.sin_addr.s_addr=INADDR_ANY;

//绑定地址和端口
bind(sockfd,(structsockaddr*)&serverAddr,sizeof(serverAddr));

//接收数据
intbytesReceived=recvfrom(sockfd,buffer,1024,0,(structsockaddr*)&clientAddr,&addrLen);
buffer[bytesReceived]='\0';

std::cout<<"Received:"<<buffer<<std::endl;

close(sockfd);

return0;
}