WIA Scanning for Neatdesk

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I am trying to scan duplex interfacing with Neatdesk scanner using VB.Net. I currently have the capability to scan each page front only, and have not been able to set the unit to duplex. When I try to set the duplex parameter, I either get a "out of bounds" error or "access denied" error. Here is my snippet of the code that I found and edited from other sources.

Dim DeviceManager1 = CreateObject("WIA.DeviceManager")   'wia device manager
        For i = 1 To DeviceManager1.DeviceInfos.Count 'loop through all devices

            If DeviceManager1.DeviceInfos(i).Type = 1 Then  'Select only scanners, not webcams etc...
                Dim Scanner As WIA.Device = DeviceManager1.DeviceInfos(i).connect
                Dim Img As WIA.ImageFile
                Try
                    'MsgBox(Scanner.Properties("3088").Value.ToString)
                    With Scanner.Items(1)
                        .Properties("6146").Value = 4 '4 is Black-white,gray is 2, color 1 (Color Intent)
                        .Properties("3088").Value = &H4 'To print Duplex
                    End With                                   
                Finally
                    Img = Scanner.Items(1).Transfer("{B96B3CAE-0728-11D3-9D7B-0000F81EF32E}") 'Grab the image in jpeg format
                    Img.SaveFile(location & page & ".jpg")
                 End Try
            End If
        Next

If I omit the

.Properties("3088").Value = &H4

portion, I am able to scan all the documents I need front face up only.

Thank you for the help.

Posted 31-Jul-13 9:49am

ayaraneri3

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Member 10399810 · Answer 1 · 2014-10-14T09:50:00

I know this is an old thread, but if someone needs another solution, this might be it :

You cannot only set the WIA_DPS_DOCUMENT_HANDLING_SELECT (3088) to the value 4.
You need to select the FEEDER or FLATBED value as well.

So let's say i want to select the FEEDER (1) and the DUPLEX (4) mode, you would have to assign the value 5:
1 + 4 = 5

http://msdn.microsoft.com/en-us/library/windows/hardware/ff552792%28v=vs.85%29.aspx

Trak4Net · Answer 2 · 2013-07-31T22:43:00

I think your problem is that the color intent is a item property, but the document handling select is a device property. I don't have my WIA code in front of me but will probably be something along these lines

Scanner.Properties("3088").Value = &H4
instead of ...
Scanner.Items(1).Properties...

Also, the document handling select is a flag property, here are the const values from wiadef.h

VB

'WIA_DPS_DOCUMENT_HANDLING_SELECT flags

const FEEDER = &H1
const FLATBED = &H2
const DUPLEX = &H4
const FRONT_FIRST = &H8
const BACK_FIRST = &H10
const FRONT_ONLY = &H20
const BACK_ONLY = &H40
const NEXT_PAGE = &H80
const PREFEED = &H100
const AUTO_ADVANCE = &H200

Trak4Net · Answer 3 · 2013-08-12T08:43:00

I looked at my code and this is how I enable duplexing for WIA. I know this is in C# but should be able to translate to VB easily. If you need it translated I can take the time to translate it for you.

C#

//this is from my GetPropertyName method
case PropertyId.DocumentHandlingSelect:
                    return "Document Handling Select";

C#

internal static void SetDuplexMode(WIA.Device dev, bool useduplex)
{
    try
    {
        //get device property for document handling select
        WIA.Property prop = dev.Properties[GetPropertyName(PropertyId.DocumentHandlingSelect)];

        if (prop != null)
        {
            //get current value
            int mask = prop.get_Value();

            if (useduplex) //enable duplexing
            {
                //mask "or equals" duplex (bit mask)
                mask |= (int)document.handling.Select.DUPLEX;
            }
            else //disable duplexing
            {
                //mask "and equals" duplex (bit mask)
                mask &= ~(int)document.handling.Select.DUPLEX;
            }
            //set value
            prop.set_Value(mask);
        }

    }
    catch (System.Runtime.InteropServices.COMException cex)
    {
    }
}

WIA Scanning for Neatdesk

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