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  • 网络编程 单纯UDP通信

    网络编程 单纯UDP通信

    1,UDP发送端

    2,UDP接收端

    UDP发送端:

    #include <stdio.h>
    #include <unistd.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>
    
    int main(int argc, char* argv[]){
      int sock;
      sockaddr_in addr;
      int n;
    
      if(argc != 2){
        return 1;
      }
    
      sock = socket(AF_INET, SOCK_DGRAM, 0);
      addr.sin_family = AF_INET;
      addr.sin_port = htons(12345);
      inet_pton(AF_INET, argv[1], &addr.sin_addr.s_addr);
    
      n = sendto(sock, "aaaaa", 5, 0, (sockaddr*)&addr, sizeof(addr));
      close(sock);
      return 0;
    }
    
    

    github源代码

    发送端的执行方式:

    ./a.out 127.0.0.1
    

    UDP接收端

    #include <stdio.h>
    #include <unistd.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    
    int main(){
      int sock;
      sockaddr_in addr;
      sockaddr_in senderinfo;
      socklen_t addrlen;
      char buf[2048];
      int n;
    
      sock = socket(AF_INET, SOCK_DGRAM, 0);
    
      addr.sin_family = AF_INET;
      addr.sin_port = htons(12345);
      addr.sin_addr.s_addr = INADDR_ANY;
    
      bind(sock, (sockaddr*)&addr, sizeof(addr));
    
      addrlen = sizeof(senderinfo);
    
      n = recvfrom(sock, buf, sizeof(buf) - 1, 0,
    	   (sockaddr*)&senderinfo, &addrlen);
      write(fileno(stdout), buf, n);
      close(sock);
      return 0;
    }
    
    

    github源代码

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  • 原文地址:https://www.cnblogs.com/xiaoshiwang/p/9776035.html
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