AutoIt Requires Chilkat v11.7.0+

PDF Object Streams: generate, preserve or disable

See more PDF Optimization Examples

Demonstrates the objectStreams option. An object stream packs many small objects (dictionaries, not stream data) into one compressed stream, which is usually a worthwhile saving in a document with many pages or tags. "generate" (the default) packs them and writes a cross-reference stream; "preserve" keeps the file as it is -- packed if it already was, not packed if it was not; "disable" writes every object on its own with a classic cross-reference table, which is what a PDF 1.4 reader needs. Object streams require PDF 1.5 and are skipped for PDF/A-1. AutoIt

Local $bSuccess = False

;  This example requires the Chilkat API to have been previously unlocked.
;  See Global Unlock Sample for sample code.

;  The PDF used in this example is available at grand_canyon_hiking_guide.pdf

$oFac = ObjCreate("Chilkat.FileAccess")
$oJson = ObjCreate("Chilkat.JsonObject")
$oJsonOut = ObjCreate("Chilkat.JsonObject")

;  generate: pack the objects (the default).
$oPdf1 = ObjCreate("Chilkat.Pdf")
$bSuccess = $oPdf1.LoadFile("qa_data/pdf/grand_canyon_hiking_guide.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf1.LastErrorText & @CRLF)
    Exit
EndIf

$oJson.UpdateString("objectStreams","generate")
$bSuccess = $oPdf1.Optimize("optimize",$oJson,$oJsonOut)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf1.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oPdf1.WriteFile("qa_output/grand_canyon_objstm_generate.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf1.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("generate: " & $oFac.FileSize("qa_output/grand_canyon_objstm_generate.pdf") & " bytes, objects packed: " & $oJsonOut.IntOf("actions.objectStreams.count") & @CRLF)

;  disable: every object on its own, with a classic cross-reference table.
$oPdf2 = ObjCreate("Chilkat.Pdf")
$bSuccess = $oPdf2.LoadFile("qa_data/pdf/grand_canyon_hiking_guide.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf2.LastErrorText & @CRLF)
    Exit
EndIf

$oJson.UpdateString("objectStreams","disable")
$bSuccess = $oPdf2.Optimize("optimize",$oJson,$oJsonOut)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf2.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oPdf2.WriteFile("qa_output/grand_canyon_objstm_disable.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf2.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("disable:  " & $oFac.FileSize("qa_output/grand_canyon_objstm_disable.pdf") & " bytes" & @CRLF)

;  preserve: leave the file's own structure alone.  Use it when the output must stay readable by
;  whatever reads the input today.
$oPdf3 = ObjCreate("Chilkat.Pdf")
$bSuccess = $oPdf3.LoadFile("qa_data/pdf/grand_canyon_hiking_guide.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf3.LastErrorText & @CRLF)
    Exit
EndIf

$oJson.UpdateString("objectStreams","preserve")
$bSuccess = $oPdf3.Optimize("optimize",$oJson,$oJsonOut)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf3.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oPdf3.WriteFile("qa_output/grand_canyon_objstm_preserve.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf3.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("preserve: " & $oFac.FileSize("qa_output/grand_canyon_objstm_preserve.pdf") & " bytes" & @CRLF)