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  1. // UDPClient.cpp : Defines the entry point for the console application.
  2. //
  3.  
  4. #include "stdafx.h"
  5. #include <WS2tcpip.h>
  6. #include <iostream>
  7. #include <conio.h>
  8. #include <string>
  9. using namespace std;
  10.  
  11. #pragma comment(lib,"ws2_32.lib")
  12.  
  13. int _tmain(int argc, char* argv[])
  14. {
  15.     WSADATA wsaData;
  16.     WORD version = MAKEWORD(2,2);
  17.  
  18.     struct sockaddr_in remaddr;     /* remote address */
  19.     socklen_t addrlen = sizeof(remaddr);  
  20.    
  21.    
  22.     int wsOk = WSAStartup(version, &wsaData);
  23.     if(wsOk != 0)
  24.     {
  25.         cout<<"Error Winsok sie nie uruchomil";
  26.         return 0;
  27.     }
  28.  
  29.         // Create a hint structure for the server
  30.     sockaddr_in server;
  31.     server.sin_family = AF_INET; // AF_INET = IPv4 addresses
  32.     server.sin_port = htons(54000); // Little to big endian conversion
  33.     inet_pton(AF_INET, "192.168.1.10", &server.sin_addr); // Convert from string to byte array
  34.  
  35.     // Socket creation, note that the socket type is datagram
  36.     SOCKET out = socket(AF_INET, SOCK_DGRAM, 0);
  37.  
  38.     // Write out to that socket
  39.     string s = "Dupa";
  40.     int sendOk = sendto(out, s.c_str(), s.size() + 1, 0, (sockaddr*)&server, sizeof(server));
  41.  
  42.     if (sendOk == SOCKET_ERROR)
  43.     {
  44.         cout << "That didn't work! " << WSAGetLastError() << endl;
  45.     }
  46.     char *buf;
  47.  
  48.     for (;;) {
  49.                
  50.                 int recvlen = recvfrom(out, buf, sizeof(buf), 0, (struct sockaddr *)&remaddr, &addrlen);
  51.                 printf("received %d bytes\n", recvlen);
  52.                 if (recvlen > 0) {
  53.                         buf[recvlen] = 0;
  54.                         printf("received message: \"%s\"\n", buf);
  55.                 }
  56.         }
  57.     // Close the socket
  58.     closesocket(out);
  59.  
  60.     // Close down Winsock
  61.     WSACleanup();
  62.     _getch();
  63.     return 0;
  64. }
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