API call need help

I am trying to use the EnumJobs API. I am successful in Opening the printers and closing. Trying to use the enumjobs api is giving me error 5, Procedure call or argument is not valid. The following is the program listing. You can assume that the printer handle is correct.

I think that my problem is in passing the right parameters, especially the returned info2 array.

<DllImport("winspool.drv", EntryPoint:="EnumJobsA", SetLastError:=True, _
CharSet:=CharSet.Ansi, ExactSpelling:=True, _
CallingConvention:=CallingConvention.StdCall)> _
Public Shared Function Getjobs(ByVal ptrPrnHandle As IntPtr, ByVal FirtsJob As Integer, ByVal NoJobs As Integer, ByVal InfoLvl As Integer, <OutAttribute()> ByRef JobsPtr As Byte(), ByVal JobsBuff As Integer, ByVal BufferSize As Integer, ByVal JobsREturned As Integer) As Boolean

End Function
<DllImport("winspool.drv", EntryPoint:="OpenPrinterA", SetLastError:=True, _
CharSet:=CharSet.Ansi, ExactSpelling:=True, _
CallingConvention:=CallingConvention.StdCall)> _
Public Shared Function openPrintDrv(ByVal strPrnName As String, ByRef intPrnHandle As IntPtr, ByVal intDefault As PRINTER_DEFAULTS) As Boolean

End Function
<DllImport("winspool.drv", EntryPoint:="ClosePrinter", SetLastError:=True, _
CharSet:=CharSet.Ansi, ExactSpelling:=True, _
CallingConvention:=CallingConvention.StdCall)> _
Public Shared Function ClosePrint(ByRef ptrPrnHandle As IntPtr) As Boolean

End Function

'******** Opening Printer

Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click
Dim intHandle As IntPtr
Dim myint As IntPtr
Dim Currprn As New Printing.PrinterSettings

Dim IntDefault As PRINTER_DEFAULTS

Dim strPrint As String
Dim retval As Boolean
strPrint = cmbPrinters.SelectedText

IntDefault.pDatatype = Nothing
IntDefault.pDevMode = Nothing
IntDefault.DesiredAccess = PrinterAccessRights.PRINTER_ACCESS_ADMINISTER
retval = openPrintDrv(cmbPrinters.SelectedItem, intHandle, IntDefault)
lblPrnHandle.Text = intHandle.ToInt32
If retval = False Then
MessageBox.Show("Handle not created")
lblErrNo.Text = Err.LastDllError
lblError.Text = ErrorToString(Err.LastDllError)
Else
fillArray(intHandle)

End If
End Sub

Private Sub fillArray(ByRef prnHandle As IntPtr)
Dim ArrInfo2 As Byte() = {0}
Dim intFirstJob, intInfoLevel, intNoOfJobs, intBufferSize As Integer
Dim retval As Boolean

'GET the buffer size required

retval = Getjobs(prnHandle, 0, 120, 2, ArrInfo2, 0, intBufferSize, intNoOfJobs)

' ***** Retval is returning false and arrinfo2 is nothing

If retval = False Then
MessageBox.Show("Buffer size Unknown")
lblErrNo.Text = Err.LastDllError
lblError.Text = ErrorToString(Err.LastDllError)
End If

If retval = True Then
retval = Getjobs(prnHandle, 0, 500, 2, ArrInfo2, 0, intBufferSize, intNoOfJobs)
lblNoJobs.Text = intNoOfJobs
End If


retval = ClosePrint(prnHandle)
End Sub


Any Help ?