B4X Requires Chilkat v11.7.0+

Audit a PDF First, Optimize Only If It Is Worth It

See more PDF Optimization Examples

Demonstrates deciding whether to rewrite a PDF at all. "audit" costs a fraction of a second and changes nothing, so a batch job can audit every file and optimize only those where enough would be saved. Here the threshold is a tenth of the file; a file already as small as it can be is left alone. B4X

Dim success As Boolean = 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 watersense_accomplishments.pdf

Dim pdf As ChilkatPdf
pdf.Initialize("pdf")
success = pdf.LoadFile("qa_data/pdf/watersense_accomplishments.pdf")
If success = False Then
    Log(pdf.LastErrorText)
    Return
End If


Dim json As ChilkatJsonObject
json.Initialize
Dim jsonOut As ChilkatJsonObject
jsonOut.Initialize
success = pdf.Optimize("audit", json, jsonOut)
If success = False Then
    Log(pdf.LastErrorText)
    Return
End If


Dim fileSize As Int = jsonOut.IntOf("fileSize")
Dim estimated As Int = jsonOut.IntOf("estimatedSavings.total")
Log("fileSize:  " & fileSize)
Log("estimated: " & estimated)

'  Only bother when at least a tenth of the file would go.
If estimated > (fileSize / 10) Then
    Log("Worth optimizing.")
    success = pdf.Optimize("optimize", json, jsonOut)
    If success = False Then
        Log(pdf.LastErrorText)
        Return
    End If

    success = pdf.WriteFile("qa_output/watersense_optimized.pdf")
    If success = False Then
        Log(pdf.LastErrorText)
        Return
    End If

    Log("bytesSaved: " & jsonOut.IntOf("bytesSaved"))
Else
    Log("Already small enough; left as it is.")
End If