Analyze binary file content

rudi · October 19, 2017

Hello.

I'm too stupid to see my mistake:

To investigate the internal "dictionary" of TIFF files I'd like to read in the files in binary mode and to check, if there are more than one pages "in" this TIFF.

Notepad++, "View as Hex" is presenting the first bytes as "49 49 2a 20 08 20 20 20 12" for the TIF attached to this posting

The "TIFF Header Format" is easy:

Offset 00h, 2 Byte = Byte Order, "II"=intel, "MM"=motorola. (I = 0x49)

--> II

Offset 02h, 2 Byte = Version Nr.

Offset 04h, 4 Byte = pointer to first IFD entry

Description of TIFF header: https://www.awaresystems.be/imaging/tiff/faq.html#q3

Howto read and analyse the binary content correctly? This is my messy, not operational code:

$sampleTiff="H:\daten\tif\11\11\111111.TIF"
$h=FileOpen($sampleTiff,16)
$content=FileRead($h)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $content = ' & $content & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
FileClose($h)

$type=VarGetType($content)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $type = ' & $type & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console


$ToString=BinaryToString($content)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $ToString = ' & $ToString & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
ConsoleWrite(@CRLF  & @CRLF)

$content=StringTrimLeft($content,2) ; cut off the leading "0x"
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $content = ' & $content & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console


for $i = 1 to 8 step 8
    $next=StringMid($content,$i,2)
    ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') :     $next = ' &     $next & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
    $Chr=BinaryToString($next)
    ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') :     $Chr = ' &  $Chr & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
    ConsoleWrite(@CRLF & "---" & @CRLF)
Next

Regards, Rudi.

111111.TIF

Edited October 19, 2017 by rudi

InnI · October 19, 2017

1 hour ago, rudi said:

Notepad++, "View as Hex" is presenting the first bytes as "49 49 2a 20 08 20 20 20 12" for the TIF attached to this posting

It's strange. I see "49 49 2A 00 08 00 00 00" in attached "111111.TIF"

$hFile = FileOpen("111111.tif", 16)
$ByteOrder = FileRead($hFile, 2)
$Version = FileRead($hFile, 2)
$FirstIFD = FileRead($hFile, 4)
FileClose($hFile)

ConsoleWrite($ByteOrder & @CRLF)
ConsoleWrite($Version & @CRLF)
ConsoleWrite($FirstIFD & @CRLF)

rudi · October 19, 2017

Hello,

thanks for your reply.

You are right. I copy-pasted the displayed values from Notepad++ (Hex View) and didn't notice, that they changed after beeing pasted here.

Amazing behaviour: Notepad++ can copy values to the clipboard, and when using this feature, "00" is modified to "20", no clue, why, all other values are correct. This is reproducable...

49 49 2a 00 08 00 00 00 11 00 fe 00 04 00 01 00

Your code is quite exactly what I was looking for. I wasn't aware, that after opening a file in binary mode I am able to "read <offset> <ount-of-bytes>".

That should do, thanks a lot!

Regards, Rudi.

Danyfirex · October 19, 2017

Because If you use that notepad change 00 to 20 is to avoid end of string character (null bytes) dont care about. I suggest you to use a real hex editor. HxD is ok.

Saludos

rudi · October 19, 2017

Hello,

thanks for your reply. Notepad++ does *NOT* take the real values to the clipboard, but the "string representation". Except for "00", that's replaced with "20", as far as I can see it right now...

Regards, Rudi.

Edited October 19, 2017 by rudi

rudi · October 19, 2017

Hello.

somewhat modified code:

; $sampleTiff="H:\DATEN\tif\73\23\M000017323.tif"
; $sampleTiff="H:\daten\tif\11\11\111111.TIF"
$sampleTiff="111111.TIF"

$hFile=FileOpen($sampleTiff,16)



$Bo1=chr(FileRead($hFile,1)) ; Byte Order Info, Byte 1
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Bo1 = ' & $Bo1 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
$Bo2=chr(FileRead($hFile,1)) ; Byte Order Info, Byte 1
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Bo2 = ' & $Bo2 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; is there a way to read the "0x4949" as "II" in one run? (I = indigo = 0x49)


$TVer1=FileRead($hFile,2) ; zwei bytes für TIFF Version. Immer 0x2A00
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $TVer1 = ' & $TVer1 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; the first read value seems to be the HighByte (big/little endian???)
; 2A = 42 = Version Number for all TIFFs I can touch right now. But it's 0x2A00, not 0x002A --> again little / big endian???


$IDF1Start=FileRead($hFile,4)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $IDF1Start = ' & $IDF1Start & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; offset 0x08 is correct.

$IDF1Count=FileRead($hFile,2)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $IDF1Count = ' & $IDF1Count & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; 0x11 = 17 entries a 12 bytes --> again it's 0x1100, not 0x0011


FileClose($hFile)


$Hex17=Hex(17,4)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Hex17 = ' & $Hex17 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

This is giving these consolewrite outputs. So I assume, I need to "swap" little-endian/big-endian

Is there a funktion doing so, that I've missed?

Regards, Rudi.

@@ Debug(11) : $Bo1 = I
>Error code: 0
@@ Debug(13) : $Bo2 = I
>Error code: 0
@@ Debug(18) : $TVer1 = 0x2A00
>Error code: 0
@@ Debug(24) : $IDF1Start = 0x08000000
>Error code: 0
@@ Debug(28) : $IDF1Count = 0x1100
>Error code: 0
@@ Debug(32) : $Hex17 = 0011
>Error code: 0

Edited October 19, 2017 by rudi

InnI · October 19, 2017

12 minutes ago, rudi said:

"swap" little-endian/big-endian

#include <WinAPIMisc.au3>
_WinAPI_SwapWord()
_WinAPI_SwapDWord()
_WinAPI_SwapQWord()

RTFC · October 19, 2017

May I suggest you read the header into a struct first (see DllStructCreate), then read individual elements with DllStructGetData? See my Xbase.au3 for an example (link in my sig).

rudi · October 19, 2017

Hello.

Thanks for your reply.

I never used DllStructCreate so far ... :sweating:

All I need is a look at the Pointer "Next IDF". If that value is 0x0000, then this is a single page tiff. That's all I need:

$sampleTiff="111111.TIF"

$hFile=FileOpen($sampleTiff,16)



$Bo1=chr(FileRead($hFile,1)) ; Byte Order Info, Byte 1
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Bo1 = ' & $Bo1 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
$Bo2=chr(FileRead($hFile,1)) ; Byte Order Info, Byte 1
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Bo2 = ' & $Bo2 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; is there a way to read the "0x4949" as "II" in one run? (I = indigo = 0x49)


$TVer1=FileRead($hFile,2) ; zwei bytes für TIFF Version. Immer 0x2A00
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $TVer1 = ' & $TVer1 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; the first read value seems to be the HighByte (big/little endian???)
; 2A = 42 = Version Number for all TIFFs I can touch right now. But it's 0x2A00, not 0x002A --> again little / big endian???


$IDF1Start=FileRead($hFile,4)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $IDF1Start = ' & $IDF1Start & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; offset 0x08 is correct.

$IDF1Count=FileRead($hFile,2)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $IDF1Count = ' & $IDF1Count & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; 0x11 = 17 entries a 12 bytes --> again it's 0x1100, not 0x0011


$Hex17=Hex(17,4)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Hex17 = ' & $Hex17 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console


for $Skip = 1 to 17 ; due to this little / big endian issue manually set "End-Value"
    $foo=FileRead($hFile,12)
    ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $foo = ' & $foo & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
Next

ConsoleWrite("Skipping done" & @CRLF)

$NextIDF=FileRead($hFile,4)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $NextIDF = ' & $NextIDF & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

if $NextIDF=0 Then
    MsgBox(0,"Multipage TIFF check","This TIFF has just one page.")
Else
    MsgBox(64,"Multipage TIFF check","This TIFF has *MORE* than one page.")
EndIf

FileClose($hFile)

That's giving this output:

@@ Debug(11) : $Bo1 = I
>Error code: 0
@@ Debug(13) : $Bo2 = I
>Error code: 0
@@ Debug(18) : $TVer1 = 0x2A00
>Error code: 0
@@ Debug(24) : $IDF1Start = 0x08000000
>Error code: 0
@@ Debug(28) : $IDF1Count = 0x1100
>Error code: 0
@@ Debug(33) : $Hex17 = 0011
>Error code: 0
@@ Debug(38) : $foo = 0xFE0004000100000000000000
>Error code: 0
@@ Debug(38) : $foo = 0x0001040001000000480D0000
>Error code: 0
@@ Debug(38) : $foo = 0x010104000100000030110000
>Error code: 0
@@ Debug(38) : $foo = 0x020103000100000001000000
>Error code: 0
@@ Debug(38) : $foo = 0x030103000100000004000000
>Error code: 0
@@ Debug(38) : $foo = 0x060103000100000000000000
>Error code: 0
@@ Debug(38) : $foo = 0x0A0103000100000001000000
>Error code: 0
@@ Debug(38) : $foo = 0x1101040001000000F6000000
>Error code: 0
@@ Debug(38) : $foo = 0x120103000100000001000000
>Error code: 0
@@ Debug(38) : $foo = 0x150103000100000001000000
>Error code: 0
@@ Debug(38) : $foo = 0x160104000100000030110000
>Error code: 0
@@ Debug(38) : $foo = 0x17010400010000005D2D0000
>Error code: 0
@@ Debug(38) : $foo = 0x1A01050001000000DA000000
>Error code: 0
@@ Debug(38) : $foo = 0x1B01050001000000E2000000
>Error code: 0
@@ Debug(38) : $foo = 0x250104000100000000000000
>Error code: 0
@@ Debug(38) : $foo = 0x280103000100000002000000
>Error code: 0
@@ Debug(38) : $foo = 0x310102000C000000EA000000
>Error code: 0
Skipping done
@@ Debug(44) : $NextIDF = 0x00000000

Important to me is just the value $NextIDF. That's it.

Regards, Rudi.

rudi · October 19, 2017

Hello InnI.

Thanks for your suggestions for ....

#include <WinAPIMisc.au3>
_WinAPI_SwapWord()
_WinAPI_SwapDWord()
_WinAPI_SwapQWord()

I fail using it correctly, as the result of reading binary from the file is binary, not hex. And so far I couldn't figure out, how to convert the "binary string" to a "hex string".

$sampleTiff="111111.TIF"

$hFile=FileOpen($sampleTiff,16)



$Bo1=chr(FileRead($hFile,1)) ; Byte Order Info, Byte 1
$Bo2=chr(FileRead($hFile,1)) ; Byte Order Info, Byte 1
; is there a way to read the "0x4949" as "II" in one run? (I = indigo = 0x49)


$TVer=FileRead($hFile,2) ; zwei bytes für TIFF Version. Immer 0x2A00
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $TVer = ' & $TVer & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
$Type=VarGetType($TVer)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Type = ' & $Type & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$Swapped=_WinAPI_SwapWord($TVer)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Swapped = ' & $Swapped & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$AsString=$TVer & ""
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $AsString = ' & $AsString & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
VarGetType($AsString)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : VarGetType($AsString) = ' & VarGetType($AsString) & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console

$Swapped2=_WinAPI_SwapWord($AsString)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Swapped2 = ' & $Swapped2 & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
ConsoleWrite("42 is the correct Dec value" & @CRLF)
$Type=VarGetType($Swapped2)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Type = ' & $Type & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
ConsoleWrite("Propably here I'm done, as I just need the DEC value to get the correct numbers?"& @CRLF)

ConsoleWrite("------------------" & @CRLF)

$Back2Hex=Hex($Swapped2,4)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Back2Hex = ' & $Back2Hex & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
$Type=VarGetType($Back2Hex)
ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Type = ' & $Type & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console
; how would I get a HEX value? What do I miss?

output is this:

@@ Debug(16) : $TVer = 0x2A00
>Error code: 0
@@ Debug(18) : $Type = Binary
>Error code: 0
@@ Debug(21) : $Swapped = 10752
>Error code: 0
@@ Debug(24) : $AsString = 0x2A00
>Error code: 0
@@ Debug(26) : VarGetType($AsString) = String
>Error code: 0
@@ Debug(29) : $Swapped2 = 42
>Error code: 0
42 is the correct Dec value
@@ Debug(32) : $Type = Int32
>Error code: 0
Propably here I'm done, as I just need the DEC value to get the correct numbers?
------------------
@@ Debug(38) : $Back2Hex = 002A
>Error code: 0
@@ Debug(40) : $Type = String
>Error code: 0

Thanks again!

Regards, Rudi.

rudi · October 19, 2017

@RTFC

Hello,

thanks for your reply.

I downloaded your xbase.au3 and tried this code. It's reporting "invalid header", all files are placed in the same folder (this script, xbase.au3, 111111.tif)

#cs ----------------------------------------------------------------------------

 AutoIt Version: 3.3.14.2
 Author:         myName

 Script Function:
    Template AutoIt script.

#ce ----------------------------------------------------------------------------

; Script Start - Add your code below here
#include "xbase.au3"
#include <array.au3>


dim $myArr[1]

$TIFF="111111.tif"
_Xbase_ReadToArray($TIFF,$myArr)
_ArrayDisplay($myArr)

regards, Rudi.

InnI · October 19, 2017

29 minutes ago, rudi said:

how to convert the "binary string" to a "hex string"

$Swapped=_WinAPI_SwapWord(String($TVer))
ConsoleWrite(Hex($Swapped, 4) & @CRLF)

RTFC · October 19, 2017

39 minutes ago, rudi said:

I downloaded your xbase.au3 and tried this code. It's reporting "invalid header",

Yes, of course it would, a tiff file not being an Xbase file. :blink: I suggested this as an example how to produce a struct to read in a file header, in this case an Xbase (.dbf) database file. You define all elements using the appropriate variable type, read in the entire header (or as many bytes as you need to extract the info you need), and then use dllstructGetData to access individual elements as required. Obviously, a tiff file header will have a completely different structure than an Xbase file. But if you're only interested in a single Word, then a straight binary read would suffice.

Edited October 19, 2017 by RTFC

UEZ · October 19, 2017

You can use GDI+ to get the amount of pages within a TIFF file:

#include <GDIPlus.au3>

Global $sFile_TIFF = FileOpenDialog("Select a TIF image", "", "TIFF (*.tif;*.tiff)")
If @error Then Exit

_GDIPlus_Startup()
Global $hImage = _GDIPlus_ImageLoadFromFile($sFile_TIFF)
Global $tGUID = _GDIPlus_GIFAnimGetFrameDimensionsList($hImage, _GDIPlus_GIFAnimGetFrameDimensionsCount($hImage))
Global $iCount = _GDIPlus_GIFAnimGetFrameCount($hImage, $tGUID)
_GDIPlus_ImageDispose($hImage)
_GDIPlus_Shutdown()
MsgBox(0, "TIF Page Count", "Pages: " & $iCount)


; #FUNCTION# ====================================================================================================================
; Name ..........: _GDIPlus_GIFAnimGetFrameDimensionsCount
; Description ...: Gets the number of frame dimensions in this Image object.
; Syntax ........: _GDIPlus_GIFAnimGetFrameDimensionsCount($hImage)
; Parameters ....: $hImage              - A handle to an image / bitmap object
; Return values .: The number of frame dimensions in this Image object.
; Author ........: UEZ
; Modified ......:
; Remarks .......:
; Related .......:
; Link ..........:
; ===============================================================================================================================
Func _GDIPlus_GIFAnimGetFrameDimensionsCount($hImage)
    Local Const $aResult = DllCall($__g_hGDIPDll, "int", "GdipImageGetFrameDimensionsCount", "handle", $hImage, "ulong*", 0)
    If @error Then Return SetError(@error, @extended, 0)
    If $aResult[0] Then Return SetError(10, $aResult[0], 0)
    Return $aResult[2]
EndFunc   ;==>_GDIPlus_GIFAnimGetFrameDimensionsCount

; #FUNCTION# ====================================================================================================================
; Name ..........: _GDIPlus_GIFAnimGetFrameCount
; Description ...: Gets the frame count of the loaded gif by passing the GUID struct
; Syntax ........: _GDIPlus_GIFAnimGetFrameCount($hImage, $tGUID)
; Parameters ....: $hImage              - A handle to an image / bitmap object
;                  $tGUID               - A struct to a GUID that specifies the frame dimension.
; Return values .: The amount of frames from a GIF animated image handle
; Author ........: UEZ
; Modified ......:
; Remarks .......:
; Related .......: _GDIPlus_ImageLoadFromFile _GDIPlus_BitmapCreateFromFile
; Link ..........:
; ===============================================================================================================================
Func _GDIPlus_GIFAnimGetFrameCount($hImage, $tGUID)
    Local Const $aResult = DllCall($__g_hGDIPDll, "int", "GdipImageGetFrameCount", "handle", $hImage, "struct*", $tGUID, "ptr*", 0)
    If @error Then Return SetError(@error, @extended, 0)
    If $aResult[0] Then Return SetError(10, $aResult[0], 0)
    Return Int($aResult[3])
EndFunc   ;==>_GDIPlus_GIFAnimGetFrameCount

; #FUNCTION# ====================================================================================================================
; Name ..........: _GDIPlus_GIFAnimGetFrameDimensionsList
; Description ...: Gets the identifiers for the frame dimensions of this Image object which fills the GUID struct.
; Syntax ........: _GDIPlus_GIFAnimGetFrameDimensionsList($hImage, $iFramesCount)
; Parameters ....: $hImage              - A handle to an image / bitmap object
;                  $iFramesCount        - An integer value.
; Return values .: tagGUID struct
; Author ........: UEZ
; Modified ......:
; Remarks .......:
; Related .......:
; Link ..........:
; ===============================================================================================================================
Func _GDIPlus_GIFAnimGetFrameDimensionsList($hImage, $iFramesCount)
    Local Const $tGUID = DllStructCreate($tagGUID)
    Local Const $aResult = DllCall($__g_hGDIPDll, "int", "GdipImageGetFrameDimensionsList", "handle", $hImage, "struct*", $tGUID, "uint", $iFramesCount)
    If @error Then Return SetError(@error, @extended, 0)
    If $aResult[0] Then Return SetError(10, $aResult[0], 0)
    Return $tGUID
EndFunc   ;==>_GDIPlus_GIFAnimGetFrameDimensionsList

InnI · October 19, 2017

@rudi Try this code for TIFF frame count

#include <WinAPIMisc.au3>

$hFile = FileOpen("111111.tif", 16)
If $hFile = -1 Then Exit ConsoleWrite("File not found" & @CRLF)

$ByteOrder = FileRead($hFile, 2)
$Version = FileRead($hFile, 2)
If ($ByteOrder <> 0x4949 And $Version <> 0x2A00) _
Or ($ByteOrder <> 0x4D4D And $Version <> 0x002A) Then Exit ConsoleWrite("No TIFF" & @CRLF)

$FirstIFD = FileRead($hFile, 4)
If $ByteOrder = 0x4949 Then $FirstIFD = _WinAPI_SwapDWord(String($FirstIFD))
FileSetPos($hFile, $FirstIFD, 0)

$Count = 0
Do
  $Count += 1
  $NumTags = FileRead($hFile, 2)
  If $ByteOrder = 0x4949 Then $NumTags = _WinAPI_SwapWord(String($NumTags))
  FileSetPos($hFile, $NumTags * 12, 1)
  $NextIFD = FileRead($hFile, 4)
  If $ByteOrder = 0x4949 Then $NextIFD = _WinAPI_SwapDWord(String($NextIFD))
  FileSetPos($hFile, $NextIFD, 0)
Until Not $NextIFD

FileClose($hFile)
ConsoleWrite($Count & @CRLF)

rudi · October 20, 2017

@InnI

Hello.

That's exactly, what I was looking for! :thumbsup:

I have to admit, that I didn't really get the _WinApi_SwapDword() function so far ... :mad2:

I'll do further tries later on to get it

Thanks a lot !!!

Regards, Rudi.

Edited October 20, 2017 by rudi

UEZ · October 20, 2017

Here another version:

;Coded by UEZ build 2017-10-20 beta
#include <WinAPI.au3>

Global $sFile_TIFF = FileOpenDialog("Select a TIF image", "", "TIFF (*.tif;*.tiff)")
If @error Then Exit
ConsoleWrite("Pages found: " & TIFFPageCount($sFile_TIFF) & @CRLF)

Func TIFFPageCount($sFile_TIFF)
    Local $hFile = _WinAPI_CreateFile($sFile_TIFF, 2, 2), $Bytes
    Local $iFilesize = FileGetSize($sFile_TIFF)
    Local $tData = DllStructCreate("ushort Order;ushort Type;dword IFD")
    _WinAPI_ReadFile($hFile, DllStructGetPtr($tData), 8, $Bytes)
    If Not BitOR($tData.Order = 0x4949, $tData.Order = 0x4D4D) Then
        _WinAPI_CloseHandle($hFile)
        Return SetError(1, 0, 0)
    EndIf
    Local $IFD = $tData.IFD
    Local $tData2 = DllStructCreate("ushort NumDirEntries")
    Local $iTags, $iPages = 0
    Do
        _WinAPI_SetFilePointer($hFile, $IFD)
        _WinAPI_ReadFile($hFile, DllStructGetPtr($tData2), 2, $Bytes)
        If $tData2.NumDirEntries > 256 Then ExitLoop
        $iTags = $tData2.NumDirEntries * 12 + 2
        _WinAPI_SetFilePointer($hFile, $IFD + $iTags)
        _WinAPI_ReadFile($hFile, DllStructGetPtr($tData, "IFD"), 4, $Bytes)
        $IFD = $tData.IFD
        $iPages += 1
    Until $IFD = 0 or $IFD > $iFilesize - 4
    _WinAPI_CloseHandle($hFile)
    Return $iPages
EndFunc

I don't know if it is working also for TIFs multi page MM encoded.

rudi · October 20, 2017

@UEZ

Great code sample!

Thanks.

Rudi.

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I fail using it correctly, as the result of reading binary from the file is binary, not hex. And so far I couldn't figure out, how to convert the "binary string" to a "hex string".

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