Visual Basic 6.0 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. Visual Basic 6.0

Dim success As Long
success = 0

'  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 New ChilkatPdf
success = pdf.LoadFile("qa_data/pdf/watersense_accomplishments.pdf")
If (success = 0) Then
    Debug.Print pdf.LastErrorText
    Exit Sub
End If

Dim json As New ChilkatJsonObject
Dim jsonOut As New ChilkatJsonObject
success = pdf.Optimize("audit",json,jsonOut)
If (success = 0) Then
    Debug.Print pdf.LastErrorText
    Exit Sub
End If

Dim fileSize As Long
fileSize = jsonOut.IntOf("fileSize")
Dim estimated As Long
estimated = jsonOut.IntOf("estimatedSavings.total")
Debug.Print "fileSize:  " & fileSize
Debug.Print "estimated: " & estimated

'  Only bother when at least a tenth of the file would go.
If (estimated > (fileSize / 10)) Then
    Debug.Print "Worth optimizing."
    success = pdf.Optimize("optimize",json,jsonOut)
    If (success = 0) Then
        Debug.Print pdf.LastErrorText
        Exit Sub
    End If

    success = pdf.WriteFile("qa_output/watersense_optimized.pdf")
    If (success = 0) Then
        Debug.Print pdf.LastErrorText
        Exit Sub
    End If

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