Using VB.NET with ADU USB Data
Acquisition Products (
AduHid.DLL)
 ADU Data Acquisition Interface Products
The AduHid DLL can be used directly from a Visual Basic dot net
application. Some adjustments must be to the Visual Basic code
to allow execution within the Common Language Runtime.
The zip file, AduHid-Eg-VB-Net.ZIP, contains a sample Visual
Basic project that was converted from VB6.0 to VB.net using
the automated upgrade tool provided with Visual Studio dot net.
All source code is provided so that you may review details that
are not highlighted here.
The resulting executable, Project1.exe, was tested under
Windows XP.
Highlights of changes:
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1) Change the sSerialNumber declaration in the ADU_DEVICE_ID
structure so that it includes marshalling arguments.
The delcaration should read as follows.
<VBFixedString(7),System.Runtime.InteropServices.MarshalAs
(System.Runtime.InteropServices.UnmanagedType.ByValTStr,SizeConst:=7)> Public
sSerialNumber As String
2) Change the declaration of the ShowList function so that sPrompt
has a type of String.
The declaration should read as follows.
Declare Function ShowAduDeviceList Lib "AduHid.DLL" (ByRef pAduDeviceId As
ADU_DEVICE_ID, ByVal sPrompt As String) As Integer
NOTES:
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The AduHid DLL is a legacy DLL. It is not a COM object.
It is not an "assembly".
DO NOT specify the the AduHid DLL as a reference.
(ie DO NOT use -r on the command line for AduHid.dll)
The AduHid.dll must be copied into the sub-directory that
contains the EXE file.
(ie. in the example the "Project1.NET/bin" sub-directory contains both
the Project1.exe AND AduHid.dll)
DOWNLOAD VB.NET Example Files in
ZIP format. ( 65K )
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