Acessing parallel port problems

[gabrielSbrug]

Hi guys,

I've been trying to this application in Visual Studio 2010 to only write to the parallel port, so supposedly it would be a very easy task, and by all the tutorials in the internet i've seen before it really is! Although it throws me always the same error which is too generic and don't give enough information for me to solve it. I'm doing this using the "Inpout32.dll" library to make the communication between VB.NET and the port... If you guys know any other way, please tell me.

The code is basically this:
Module:

Module Module1
     Public Declare Sub Out Lib "inpout32.dll" Alias "Out32" (ByVal PortAddress As Integer, ByVal Value As Integer)
End Module

Form1:

Public Class Form1
    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Out(888, 1)
    End Sub
End Class

Even though this code is extremely simple it was supposed to work fine, but on clicking in the button i get this error:

SEHException was unhandled
External component has thrown an exception.

What i've tryed and didn't work:
- Used hexadecimal, binary an decimal for port address and data send.
- Verified if the port drivers and installation were ok.
- Tryed reading from the port (same error occurs).
- etc.

Please guys, I don't know where else to search for this.

[enrico1982]

Is there any information in the inner exception which may point to the issue?

[gabrielSbrug]

This is all I could get:

System.Runtime.InteropServices.SEHException was unhandled
  ErrorCode=-2147467259
  Message=External component has thrown an exception.
  Source=testParallel
  StackTrace:
       at WindowsApplication1.Module1.Out(Int32 PortAddress, Int32 Value)
       at WindowsApplication1.Form1.Button1_Click(Object sender, EventArgs e) in C:\Documents and Settings\saognaza\Desktop\testParallel\testParallel\Form1.vb:line 3
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(ApplicationContext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at WindowsApplication1.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: