UDP Peer to Peer on a single PC

pdwyer · Post by **pdwyer** » Sun Mar 02, 2008 3:28 pm

Disclaimer: Dare made me do it, if it doesn't work blame him!

This is a simple (not thread or anything else safe) UDP peer (or in PB terms UDP Client/Server). Its port usage is a little odd as it's designed to run on the one PC. Compile it to exe then run it twice. It should run once listening on 7001 with a partner of 7002 and then the second time you run it it will be the other way around.

if you want to use your broadcast address ( http://en.wikipedia.org/wiki/Broadcast_address ) then you will need more than one PC so you can listen on the same port on different IP's then just change the IP below from 127.0.0.1 to your broadcast address.

Code: Select all


If InitNetwork() = 0
    MessageRequester("Error", "Can't initialize the network !", 0)
    End
EndIf

Declare UDPListen(Dummy.l)

Port1 = 7001
Port2 = 7002

CID = CreateNetworkServer(#PB_Any, Port1, #PB_Network_UDP)

If cid = 0
    CID = CreateNetworkServer(#PB_Any, Port2, #PB_Network_UDP)
    MyPort = Port2
    PartnerPort = Port1
Else
    MyPort = Port1
    PartnerPort = Port2
EndIf

If CId = 0
    MessageRequester("Error", "Ports in use", 0)
    End
EndIf

;=============================================================

OpenConsole()

    PrintN("Listening on: " + Str(MyPort))
    CreateThread(@UDPListen(),0)
    
    While 1
        PrintN("Type Data to send: ")
        SendData.s = Input()
        
        ConnectionID = OpenNetworkConnection("127.0.0.1", PartnerPort, #PB_Network_UDP)
        SendNetworkString(ConnectionID, SendData)
        CloseNetworkConnection(ConnectionID)
    Wend

CloseConsole()

;=============================================================

Procedure UDPListen(Dummy.l)

    bufferlen = 1024

    While 1
        EventType = NetworkServerEvent()
        If EventType = #PB_NetworkEvent_Data
            *DataBuffer = AllocateMemory(bufferlen)  
            Result = ReceiveNetworkData(EventClient(), *DataBuffer, bufferlen) 
            PrintN("Data From: " + IPString(GetClientIP(EventClient())))
            ;Debug "bytes " + Str(result)
            PrintN("Data: " + PeekS(*DataBuffer))
            PrintN("")
            PrintN("Type Data to send: ")
            FreeMemory(*DataBuffer)
        EndIf
        
        Delay(50)
    Wend

EndProcedure

Dare · Post by **Dare** » Sun Mar 02, 2008 4:30 pm

Well, it works here!

Very nice and thank you.

srod · Post by **srod** » Sun Mar 02, 2008 9:25 pm

Damn, I was hoping it wouldn't work so I could blame dare and give him a good kicking!

Oh well!

Thanks for sharing.

pdwyer · Post by **pdwyer** » Mon Mar 03, 2008 1:35 pm

Here is a version for just a normal UDP chat example, you will need two systems to use it. the IP is hardcoded but you could change that in an input() command. If systems are on the same lan you can use the broadcast address and you will also see what you send come back

swap "**IP_HERE**" with the target IP address

Code: Select all



If InitNetwork() = 0
    MessageRequester("Error", "Can't initialize the network !", 0)
    End
EndIf

Declare UDPListen(Dummy.l)

Port = 7000


CID = CreateNetworkServer(#PB_Any, Port, #PB_Network_UDP)

If CId = 0
    MessageRequester("Error", "Ports in use", 0)
    End
EndIf

;=============================================================

OpenConsole()

    PrintN("Listening on: " + Str(port))
    CreateThread(@UDPListen(),0)
    
    While 1
        PrintN("Type Data to send: ")
        SendData.s = Input()
        
        ConnectionID = OpenNetworkConnection("**IP_HERE**", port, #PB_Network_UDP)
        SendNetworkString(ConnectionID, SendData)
        CloseNetworkConnection(ConnectionID)
    Wend

CloseConsole()

;=============================================================

Procedure UDPListen(Dummy.l)

    bufferlen = 1024

    While 1
        EventType = NetworkServerEvent()
        If EventType = #PB_NetworkEvent_Data
            *DataBuffer = AllocateMemory(bufferlen)  
            Result = ReceiveNetworkData(EventClient(), *DataBuffer, bufferlen) 
            PrintN("Data From: " + IPString(GetClientIP(EventClient())))
            ;Debug "bytes " + Str(result)
            PrintN("Data: " + PeekS(*DataBuffer))
            PrintN("")
            PrintN("Type Data to send: ")
            FreeMemory(*DataBuffer)
        EndIf
        
        Delay(50)
    Wend

EndProcedure

Pantcho!! · Post by **Pantcho!!** » Wed Mar 05, 2008 11:22 pm

Thanks Paul, UDP programming is rare in the forum, very nice simple examples.

Psychophanta · Post by **Psychophanta** » Sat Mar 08, 2008 10:13 am

Thanks for it, pdwyer