Problem when broadcast with UDP socket

[gturi]

My problem is i couldn't received the packet that was broadcasted before
Here are my codes:
* When send broadcast packets:

Code: [Select]

sf::Packet BroadcastPacket;
BroadcastPacket<<"Hello world";
sf::IPAddress BroadcastAddress = "255.255.255.255";
unsigned int BroadcastPort = 26385;
m_Socket.Send(BroadcastPacket, BroadcastAddress, BroadcastPort);
* To receiving with sf::packet:

Code: [Select]

sf::Packet packet;// = sf::Packet();
sf::IPAddress ip;
unsigned int port = 26385;
m_SockUdp.Bind(port);
sf::Socket::Status sockStatus = this->m_SockUdp->Receive(packet, ip, port);
if(sockStatus == sf::Socket::Status::Done)
{
///some code here
///...

}
with these codes, packet always return size 0, though the sockStatus return Done
* When i try to receive with char array:

Code: [Select]


sf::IPAddress ip;
unsigned int port = 26385;
m_SockUdp.Bind(port);
size_t size;
char buf[1024];
sf::Socket::Status sockStatus = this->m_SockUdp->Receive(buf, 1024, size,ip, port );
if(sockStatus == sf::Socket::Status::Done)
{
///some code here
///...

}
i received exactly the broadcast data.

* What i don't make sence is why i can't received broadcast data in sf::packet? Or did i do some thing wrong when broadcast?
If you have done it before please give me an example to broadcast with udp socket. Any opinion is appreciated.
I used sfml 1.5 for windows, the same problem with sfml 1.4
* another question: how can i get the socket error number? sf::Socket::Status only has Error value, but i want to get the error code.

Thank you very much