API SOCKET -- ws2

Cuando intento utilizar la fn accept siempre me devuelve SOCK_INVALID, pero aun asi establece la conexion con el client..... Y no puedo utilizar las fn send y recv.. bueno aqui esta el codigo.... Bueno con unos cuantos cambios que le hecho...

Option Explicit

'Servidor simple con Sockets del API Winsock2.
'Autor: HaXprT
'Fecha: 01/03/2002
'Ultima actualización: 05/03/2002

'Constantes del API Winsock 2
Private Const INVALID_SOCKET = -1
Private Const SOCKET_ERROR = -1
Private Const WSADESCRIPTION_LEN = 256
Private Const WSASYSSTATUS_LEN = 128
Private Const AF_INET = 2
Private Const INADDR_ANY = 0
Private Const SOCK_STREAM = 1
Private Const SOCK_DGRAM = 2

'Tipos de Datos del API Winsock 2
Private Type WSAData_Type
wVersion As Integer
wHighVersion As Integer
szDescription(WSADESCRIPTION_LEN) As Byte
szSystemStatus(WSASYSSTATUS_LEN) As Byte
iMaxSockets As Integer 'U_SHORT
iMaxUdpDg As Integer 'U_SHORT
lpVendorInfo As Long

End Type

'Estructura IN_ADDR implementada sin uniones
Private Type IN_ADDR
S_addr As Long 'U_LONG

End Type

Private Type SOCKADDR_IN
sin_family As Integer
sin_port As Integer 'U_SHORT
sin_addr As Long
sin_zero(7) As Byte 'array de 8 bytes

End Type

'Funciones del API Winsock 2
' Ojo, probar con "ws2_32"
Private Declare Function socket Lib "ws2_32" (ByVal AF As Long, _
ByVal Tipo As Long, _
ByVal Protocol As Long) As Long

Private Declare Function WSAStartup Lib "ws2_32" (ByVal wVersionRequested As Integer, _
ByRef lpWSAData As Any) As Long

Private Declare Function WSACleanup Lib "ws2_32" () As Long

Private Declare Function WSAGetLastError Lib "ws2_32" () As Long

Private Declare Function htons Lib "ws2_32" (ByVal hostshort As Integer) As Long 'U_SHORT

Private Declare Function bind Lib "ws2_32" (ByVal s As Long, _
name As SOCKADDR_IN, _
ByVal namelen As Long) As Long

Private Declare Function listen Lib "ws2_32" (ByVal s As Long, _
ByVal backlog As Long) As Long

Private Declare Function send Lib "ws2_32" (ByVal Sock As Long, _
ByVal Buf As Byte, _
ByVal Lenght As Long, _
ByVal Flags As Long) As Long

Private Declare Function accept Lib "ws2_32" (ByVal hSock&, _
from As SOCKADDR_IN, _
ByVal LenFrom&) As Long

Private Declare Function recv Lib "ws2_32" (ByVal Sock As Long, _
ByVal Buf As Byte, _
ByVal Lenght As Long, _
ByVal Flags As Long) As Long

Private Declare Function closesocket Lib "ws2_32" (ByVal s As Long) As Long

Dim SockServer As Long
Function MakeWord(ByVal low As Byte, ByVal high As Byte) As Integer

MakeWord = high * 256 + low

End Function

Function LoByte(ByVal Num As Integer) As Byte

LoByte = Num And 255

End Function

Function HiByte(ByVal Num As Integer) As Byte

Num = Num / 256
HiByte = Num And 255

End Function

Function ComplementoADos(Num As Long) As Integer
' Esta función recibe un número entero que debe estar entre 0..65535,
' el cual es el rango para un tipo de dato unsigned short en C,
' y lo convierte a un valor equivalente para ser almacenado en un
' tipo de dato Integer de Visual Basic (-32768..32767)

If Num > 32767 Then
Num = Num - 1
ComplementoADos = -(Num Xor 65535)

Else
ComplementoADos = Num

End If

End Function

Function ByteArrayToString(Arreglo() As Byte, Tamaño As Long) As String
Dim Str As String
Dim i As Integer

For i = 0 To Tamaño - 1
Str = Str & Chr(Arreglo(i))

Next

ByteArrayToString = Str

End Function

'*** Mis Funciones de Alto Nivel ***
' Inica el socket del servidor y lo retorna si todo sale bien.
' En caso de fallo retorna SOCKET_ERROR
Private Function IniciarSocketServidor(Puerto As Long, Cola As Long) As Long
Dim Error As Long
Dim wVersionRequested As Integer
Dim Sin As SOCKADDR_IN
Dim wsaData As WSAData_Type

wVersionRequested = MakeWord(2, 2)
Error = WSAStartup(wVersionRequested, wsaData)

If Error <> 0 Then

MsgBox "error", vbExclamation, "Socket Invalido 1"
IniciarSocketServidor = SOCKET_ERROR
Exit Function

End If

If (LoByte(wsaData.wVersion) <> 2) Or (HiByte(wsaData.wVersion) <> 2) Then

Call WSACleanup
MsgBox "Socket Invalido, Versión de Winsock Incorrecta", vbExclamation, Error
IniciarSocketServidor = SOCKET_ERROR

Exit Function

End If

SockServer = socket(AF_INET, SOCK_STREAM, 0)

If SockServer = INVALID_SOCKET Then

Error = WSAGetLastError()
Call WSACleanup
MsgBox "Error al llamar a socket: " & Error, vbExclamation, "Error"
IniciarSocketServidor = SOCKET_ERROR
Exit Function

End If

Sin.sin_family = AF_INET
Sin.sin_addr = INADDR_ANY
Sin.sin_port = ComplementoADos(htons(Puerto))

If bind(SockServer, Sin, Len(Sin)) = SOCKET_ERROR Then

Error = WSAGetLastError()
closesocket SockServer
Call WSACleanup
closesocket (SockServer)
MsgBox "Error al llamar a bind: " & Error, vbExclamation, "Error"
IniciarSocketServidor = SOCKET_ERROR
Exit Function

End If

If listen(SockServer, Cola) = SOCKET_ERROR Then

Error = WSAGetLastError()
closesocket SockServer
Call WSACleanup
MsgBox "Error al llamar a listen: " + Error, vbExclamation, "Error"
IniciarSocketServidor = SOCKET_ERROR
Exit Function

End If

IniciarSocketServidor = SockServer

End Function

Private Function AcceptLoop(SockServ As Long)

Dim Buf(255) As Byte, N As Long, hSock&, from As SOCKADDR_IN

Do

hSock = accept(SockServ, from, Len(from))

Debug.Print "bucle"

Loop While hSock = INVALID_SOCKET

Debug.Print "hSock = " & hSock

Do
N = 0

N = recv(SockServ, Buf(0), UBound(Buf), 0)
If N > 0 Then
Debug.Print "Se recibió: " & ByteArrayToString(Buf, N)

Else
Debug.Print N

End If

N = send(SockServ, Buf(0), N, 0)
If N > 0 Then
Debug.Print "Se envió: " & ByteArrayToString(Buf, N)

Else
Debug.Print N

End If

DoEvents

Loop

End Function

Private Sub cndCerrar_Click()

closesocket SockServer
Unload Me

End Sub

Private Sub CommandIniciarSocket_Click()
Dim SockServer As Long

SockServer = IniciarSocketServidor(Val(TextPuerto.Text), 5)
If SockServer <> SOCKET_ERROR Then Call AcceptLoop(SockServer)

End Sub