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Thread: VB6 - Count pages in a multipage .tif file or .pdf (no dependencies).

  1. #1

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    Fanatic Member Comintern's Avatar
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    VB6 - Count pages in a multipage .tif file or .pdf (no dependencies).

    Just a quick and dirty routine I wrote for my current project instead of paying for someone else's .dll. This is so easy to do it should be a crime to charge for it, so I thought I would post it here. Technically, there are some changes that should be made (but in practice I haven't run into a problem). There is a flag in the header that determines whether the data is big or little-endian, I haven't found a tif yet that isn't little-endian. If you need to read the flags, there is a link to the tif specification in the comments. It obviously needs error handling and input validation as well. Finally, I'm sure there is a more elegant way to build longs and ints from an array of bytes, but LSet works fine for me.

    Enjoy.
    Last edited by Comintern; Nov 25th, 2007 at 03:03 PM. Reason: Change attachment

  2. #2

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    Re: VB6 - Count pages in a multipage .tif or .pdf file (no dependencies).

    Updated. Added a pdf page counter (although it may occasionally be off by a page (not sure why, probably some tag I need to exclude). Also added code to validate a correct .tif header and also use the big/little-endian flag to properly read the pointers on both file types.
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    Re: VB6 - Count pages in a multipage .tif file or .pdf (no dependencies).

    Great and perfect code!!!

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    Re: VB6 - Count pages in a multipage .tif file or .pdf (no dependencies).

    Or use this simpler routine for PDF files:

    Public Function GetNumberOfPDFPages(sFile As String) As Long
    Dim lFile As Long
    Dim sBuffer As String
    Dim sPages() As String
    Dim lStart As Long
    Dim lEnd As Long
    Dim lPages As Long
    Dim lTotal As Long
    Dim i As Long

    lFile = FreeFile() 'Get file number
    Open sFile For Binary As #lFile 'Open the PDF
    sBuffer = String$(LOF(lFile), Chr$(0)) 'Provide buffer in the length of the file
    Get #lFile, , sBuffer 'Write file to buffer
    Close #lFile 'Close file

    sPages = Split(sBuffer, "/Type/Pages") 'Several sections with some pages
    'The first element 0 can not begin with /Type/Pages
    For i = 1 To UBound(sPages)
    lStart = InStr(1, sPages(i), "/Count ") 'Number of pages within a section
    If lStart Then
    lStart = lStart + 7 'Pointer to first digit
    lEnd = lStart
    Do While IsNumeric(Mid$(sPages(i), lEnd, 1))
    lEnd = lEnd + 1 'Still numeric, i.e. belongs to page count
    Loop
    lPages = CLng(Mid$(sPages(i), lStart, lEnd - lStart))
    lTotal = lTotal + lPages 'Sum up the number of pages
    End If
    Next i
    GetNumberOfPDFPages = lTotal
    End Function

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