Filelocks when opening tifffile

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Filelocks when opening tifffile

Post by philip.y » Thu Apr 14, 2016 01:42 PM

Hi there,

I have an issue which only occurs intermittently on workstations running win7 or above, not on XP machines. Its only become a problem now because the customer has only just migrated to Windows 7 (not kidding!)

When trying to open the tiff to interrogate it, I get:
The process cannot access the file 'xxxx.tif' because it is being used by another process. Obviously I'd expect this if the thumbnail viewer had the file open - it doesn't and I make double sure by closeanddispose on it before calling the routine.

The routine in question simply checks if any of the pages in a tiff file are colour and returns true/false. Eg:

                 Using tif As New Vintasoft.Imaging.Codecs.Tiff.TiffFile(sourceFile, readOnlyAccess:=True)
                        For Each page In tif.Pages
                            If (page.BitsPerPixel) >= 24 Then
                                bCol = True
                                Exit For
                            End If
                        Next
                    End Using

I've also tried opening as a stream as follows but get the same.

                 Using tif As New Vintasoft.Imaging.Codecs.Tiff.TiffFile(memstream)
                        For Each page In tif.Pages
                            If (page.BitsPerPixel) >= 24 Then
                                bCol = True
                                Exit For
                            End If
                        Next
                    End Using

In a desparate hack I even tried to copy to a temp file and use this for the test but again, makes not difference.

I've looked at opportunistic locking and also any issues on the server where the tif files are located but not found any.

Any suggestions?

Cheers

Phil

Re: Filelocks when opening tifffile

Post by philip.y » Thu Apr 14, 2016 02:15 PM

To clarify, the memStream object is a filestream (rather than a memorystream - sorry for confusing naming!)

 Dim memStream As FileStream = New FileStream(sourceFile, FileMode.Open, FileAccess.Read)

Re: Filelocks when opening tifffile

Post by Alex » Fri Apr 15, 2016 06:32 AM

Hello Phil,

I think your code has logical mistake. Please send us (to support@vintasoft.com) working application, which demonstrates your problem - we need analyze your code.

Best regards, Alexander

Re: Filelocks when opening tifffile

Post by philip.y » Fri Apr 15, 2016 02:17 PM

Hi Alex,

Its a large application with other 3rd party controls so not practical - I doubt that I would have permission anyway.

Here's the full routine instead which is simply designed to return true if at least one of the pages is colour.

Cheers

Phil

Public Function ContainsColour2(ByVal sourceFile As String, Optional ByRef err As String = "", Optional fileStreamFile As FileStream = Nothing) As Boolean
            Dim bCol As Boolean = False

            Try
                '
                ' // Do we have any colour pages
                '
                If sourceFile = String.Empty Then
                    Using tif As New Vintasoft.Imaging.Codecs.Tiff.TiffFile(fileStreamFile)
                        For Each page In tif.Pages
                            If (page.BitsPerPixel) >= 24 Then
                                bCol = True
                                Exit For
                            End If
                        Next
                    End Using
                Else
                    Using tif As New Vintasoft.Imaging.Codecs.Tiff.TiffFile(sourceFile, readOnlyAccess:=True)
                        For Each page In tif.Pages
                            If (page.BitsPerPixel) >= 24 Then
                                bCol = True
                                Exit For
                            End If
                        Next
                    End Using
                End If

            Catch ex As Exception

                Call ExceptionOccured(ex, True, False)
                err = ex.Message

            End Try
            Return bCol

        End Function

    End Module

Re: Filelocks when opening tifffile

Post by Alex » Tue Apr 19, 2016 06:55 AM

Hi Phil,

You are using the Vintasoft.Imaging.Codecs.Tiff.TiffFile class and this means that you are using SDK version 7.x or earlier. Please try to use the latest version (8.3) of SDK and let me know results. We cannot reproduce your problem with the latest version of SDK.

Best regards, Alexander

Re: Filelocks when opening tifffile

Post by philip.y » Tue Apr 19, 2016 09:26 AM

Hi Alex,

Yes its an older product using 5.x of Imaging. Too much work to upgrade to 8.x and customer wouldn't pay for it anyway.

Thanks anyway - I'll find a workaround.

Cheers

Phil

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