Recv Function Crash ( Noblocking Mode)

[ntaryl]

Good morning
I try to make a Multithread socket .I pass the AcceptHandler in a new thread and Succesfully Workthread Start .
The socket By Default is Blocking mode
In blocking Mode Create Threads and can Send data to the Last Socket  Successfully
If go to Set The Socket in NoBlocking Mode

Código [Seleccionar] Expandir


Dim NonBlock As Long
NonBlock = 1
If ioctlsocket (nRet, FIONBIO, NonBlock) = SOCKET_ERROR Then
WriteLog "Socket Cannot Set NoBlocking"
End If

My project Run Succesfully Create the First thread and The Second(ListenThread).When Client Connect start the ClientThread(WorkThread)and Crash .
My Workthread

Código [Seleccionar] Expandir


Public Function Workthread (ByVal Param As Long) As Long
Const MAX_BUFFER_LENGTH As Long = 8192 'Normal = 8192' MAX = 65536
Dim Buffa (1 To MAX_BUFFER_LENGTH) As Byte
Dim dBuff As String
Dim ReadBuff As String
Dim sRec As Long
tID = GetCurrentThreadId
Add_DataClientStore ClientCount, nRet, tID''/ / Store Data in a public type (sockid, threadid)
WriteLog "New Client Arrive with Socket ID" & nRet & "On Thread ID:" & tID''/ / write data to listbox
Do''While True

ClientStore (ClientCount). Sock_ID = nRet
sRec = recv (ClientStore (ClientCount). Sock_ID, Buffa (1), MAX_BUFFER_LENGTH, 0 &)
ReadBuff = StrConv (Buffa, vbUnicode)
[b]dBuff = Left $ (ReadBuff, sRec) [/b]
WriteLog "Data Received.:" & DBuff & "Socket ID ..." & ClientStore (ClientCount). Sock_ID
End If
Loop
End Function


The line to Crash is
dBuff = Left$(ReadBuff, sRec)
If Someone know anything
Thanks for the time

p.s Attach a ScreenShot with 505 Threads
2:The Main thread and the Listenthread
503 :Clients
cpu usage =100%

This is the Error 
http://i54.tinypic.com/11qh94w.jpg
thanks for the time 
Good  night 

[ntaryl]

Good evening

Definetely my friends change a bit the Workthread and solve the Error

Código [Seleccionar] Expandir


Public Function Workthread (ByVal Param As Long) As Long
ThreadInit.InitThread
Dim DBuff As String
Dim ReadBuff As String
Dim sRec As Long
tID = GetCurrentThreadId
Add_DataClientStore ClientCount, nRet, tID
WriteLog "New Client Arrive with Socket ID" & nRet & "On Thread ID:" & tID
Do''While True
DBuff = Space (4096)
ClientStore (ClientCount). Sock_ID = nRet
sRec = recv (ClientStore (ClientCount). Sock_ID, ByVal DBuff, Len (DBuff), 0)
If sRec <> 0 And sRec <> SOCKET_ERROR Then
ReadBuff = ReadBuff & Left (DBuff, sRec)
WriteLog "Data Received.:" & ReadBuff & "Socket ID ..." & ClientStore (ClientCount). Sock_ID
End If
DoEvents
Loop
End Function


My server running and create for every Client a Workthread
When i have 5 clients for example connected and try to send data I can send only in the last connected in the list(5)
I suspect the problem come from me
Is someone know something ?
Thanks for the time