VB.NET Call Printer dll Function PInvokeStackImbalance

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Hi everyone,

I'm have problems to control a ID-Card Printer (HiTi CS-200e) in VB.NET (VS 2013).
It comes with a dll "PavoApi.dll" (seems to be an unmanaged dll).
The DLL is linked into the project and is in the project directory.
I try to move the ID-Card into the printer.
Referring to the pinters SDK docs I have to use

C++

DWORD __stdcall PAVO_MoveCard(char* szPrinter, DWORD dwPosition);

I tried to translate it into VB.NET with

VB

Imports System.Runtime.InteropServices

Friend Class HiTiDLL

    <DllImport("PavoApi.dll", CallingConvention:=CallingConvention.Cdecl)> _
    Public Shared Function PAVO_MoveCard(ByVal szPrinter As String, ByVal dwPosition As Long) As Integer

    End Function

    Public Function HitiMoveCard(ByVal PrinterName As String, ByVal Position As Long) As Integer
        Return PAVO_MoveCard(PrinterName, Position)
    End Function
End Class


Public Class cls_HiTiPrinterControl
    Public Sub Test()
        Dim HiTi As New HiTiDLL


        HiTi.HitiMoveCard("HiTi CS-200e", 3)




    End Sub
End Class

The debugger returns "PInvokeStackImbalance".

I'm new to unmanaged dlls, so what's going wrong?

Thank's for any help.
Phil

Posted 12-Jan-15 7:02am

Philipp fgi

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Richard Deeming · Accepted Answer · 2015-01-12T07:07:00

The equivalent of DWORD is Integer in VB.NET; it would have been Long in VB6, which was still rooted in the 16-bit world.

Also, I don't think CallingConvention.Cdecl matches your __stdcall declaration.

Try:

VB

Friend Class HiTiDLL

    <DllImport("PavoApi.dll")> _
    Public Shared Function PAVO_MoveCard(ByVal szPrinter As String, ByVal dwPosition As Integer) As Integer

    End Function

    Public Function HitiMoveCard(ByVal PrinterName As String, ByVal Position As Integer) As Integer
        Return PAVO_MoveCard(PrinterName, Position)
    End Function
End Class