WIA Document Handling Status returns 0 even though the ADF has pages loaded
I'm trying to scan from an ADF using VBA and the Windows Image Acquisition library (WIA). I am trying to check to see if there are pages loaded in the ADF so I know whether to scan another page. This function seems to work well in Windows 7 (my dev machine) but not in Windows XP (the production machines). I know MS made some changes to WIA when it released Vista, so this may be the root of the issue.
I'll include the entire function call to hopefully provide enough context to my question. This function is part of a class module I've written, so it references other functions within the class module. In the interest of brevity, I've left those other functions out, but will gladly post them if requested.
'Windows Imaging Acquisition (WIA) Constants
Private Const wiaFormatBMP As String = "{B96B3CAB-0728-11D3-9D7B-0000F81EF32E}"
Private Const wiaFormatGIF As String = "{B96B3CB0-0728-11D3-9D7B-0000F81EF32E}"
Private Const wiaFormatJPEG As String = "{B96B3CAE-0728-11D3-9D7B-0000F81EF32E}"
Private Const wiaFormatPNG As String = "{B96B3CAF-0728-11D3-9D7B-0000F81EF32E}"
Private Const wiaFormatTIFF As String = "{B96B3CB1-0728-11D3-9D7B-0000F81EF32E}"
Public Function ScanPage(Optional ShowScanningWizard As Boolean = True, _
Optional OverWrite As Boolean = False, _
Optional AppendToTiff As Boolean = True, _
Optional DocType As scanDocType = scanAuto, _
Optional HRes As Integer = 150, _
Optional VRes As Integer = 150, _
Optional width As Double = 8.5, _
Optional height As Double = 11, _
Optional UseADF As Boolean = False) As Boolean
'Windows Imaging Acquisition (WIA) Constants
Const ScannerDeviceType = 1
Const wiaIntentColor As Long = 1
Const wiaIntentGray As Long = 2
Const wiaIntentBlackWhite As Long = &H10004 '&H4 = IntentBlackWhite + &H10000 = Minimize Size '&H20000'131072
Dim cd As Object 'WIA.CommonDialog
Dim dev As Object 'WIA.Device
Dim ip As Object 'WIA.ImageProcess
Dim Prop As Object 'WIA.Property
Dim img As Object 'WIA.ImageFile
Dim Intent As Long
Dim MorePages As Boolean
On Error GoTo Err_ScanPage
ScanPage = False
'Verify scanned page can be saved
If Len(m_sFileName) = 0 Then
Err.Raise 5, , "Scan Aborted - No filename provided"
ElseIf IsTiff And AppendToTiff Then
'we're ok
ElseIf m_bFileExists And Not OverWrite Then
Err.Raise 58 'File already exists
End If
Set cd = CreateObject("WIA.CommonDialog")
Set dev = cd.ShowSelectDevice(ScannerDeviceType)
Set ip = CreateObject("WIA.ImageProcess")
'Set up conversion filter
ip.Filters.Add ip.FilterInfos("Convert").FilterID
ip.Filters(ip.Filters.Count).Properties("FormatID").Value = FileFormat
Select Case FileFormat
Case wiaFormatJPEG
ip.Filters(ip.Filters.Count).Properties("Quality").Value = 85
Case wiaFormatTIFF
'IP.Filters(IP.Filters.Count).Properties("Compression").Value = "CCITT4"
End Select
'Set intent for current document
If DocType <> scanAuto Then m_eScanType = DocType
If m_eScanType = scanDocument Then
Intent = wiaIntentBlackWhite 'wiaIntentGray
Else
Intent = wiaIntentColor
End If
DoEvents
If ShowScanningWizard Then
Set img = cd.ShowAcquireImage(ScannerDeviceType, , , FileFormat)
Else
With dev.items(1)
.Properties("Current Intent").Value = Intent
.Properties("Horizontal Resolution").Value = HRes
.Properties("Vertical Resolution").Value = VRes
.Properties("Horizontal Extent").Value = HRes * width
.Properties("Vertical Extent").Value = VRes * height
If m_eScanType = scanDocument Then
'Darken documents a bit so that handwriting is easier to see
' * Brightness is a value between -127 and +127
' * -45 was reached through trial and error and was tested on
' a CanoScan LiDE 20 flatbed scanner
.Properties("Brightness").Value = -45
End If
End With
On Error Resume Next
' For Each Prop In dev.items(1).Properties
' Debug.Print Prop.PropertyID, Prop.Name, Prop.Value
' Next Prop
'Scan the image
If UseADF Then
MorePages = True
For Each Prop In dev.Properties
Select Case Prop.PropertyID
Case 3087 'Document Handling Select (1 = ADF)
MorePages = MorePages And (Prop.Value = 1)
Case 3088 'Document Handling Status (1 = Page ready in ADF)
MorePages = MorePages And (Prop.Value = 1)
End Select
Next Prop
If MorePages Then Set img = cd.ShowTransfer(dev.items(1), , True) ' dev.Items(1).Transfer()
Else
Set img = cd.ShowTransfer(dev.items(1), , True)
End If
If Err.Number <> 0 Then
'User canceled the scan (most likely cause of error)
Err.Clear
ScanPage = False
GoTo Exit_ScanPage
End If
On Error GoTo Err_ScanPage
End If
If img Is Nothing Then GoTo Exit_ScanPage
'Convert to proper format
Set img = ip.Apply(img)
If IsTiff And AppendToTiff Then
m_iNumPages = m_iNumPages + 1
If m_iNumPages = 1 Then
'ReDim Preserve throws an error if the array is currently empty
ReDim m_sFNames(1 To 1)
Else
ReDim Preserve m_sFNames(1 To m_iNumPages)
End If
m_sFNames(m_iNumPages) = TempFileName(TempFilesPath, "tif")
img.SaveFile m_sFNames(m_iNumPages)
SaveToMultiTiff
m_bFileExists = True
ExtractPages
Else
If m_bFileExists And OverWrite Then Kill m_sFileName
img.SaveFile m_sFileName
m_iNumPages = 1
m_bFileExists = True
End If
ScanPage = True
Exit_ScanPage:
Exit Function
Err_ScanPage:
Select Case Err.Number
Case Else
LogError Err.Number, Err.Description, "ScanPage", "clsScan"
End Select
Resume Exit_ScanPage
End Function
Answer
The reason this worked in the dev machine (Windows 7) and not production machines (Windows XP) did not have anything to do with the operating system. The difference was actually in the driver version. When I tested the scanner on the dev machine, it connected to Windows update and downloaded the most recent driver available for that scanner. The WinXP machines were using older drivers for the same scanner. By updating the scanner drivers on the WinXP machines to the latest version, it fixed my problem.