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QByteArray datagram;
QDataStream out(&datagram, QIODevice::WriteOnly);
int d = 10;
out << d;
f_udp_socket.writeDatagram(datagram, QHostAddress::LocalHost, 6000);

WSADATA wsaData;
WSAStartup(MAKEWORD( 2, 0 ), &wsaData );

struct sockaddr_in address;
int reciever = socket(AF_INET, SOCK_DGRAM, 0);

address.sin_family = AF_INET;
address.sin_port = htons(6000);
address.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
bind(reciever, (struct sockaddr*)&address, sizeof(address));

int data;
while(true)
   int bytes = recv(reciever, (char*)&data, sizeof(data), 0);

f_udp_socket.write(&d, sizeof(d), QHostAddress::LocalHost, 6000);