DataFlex 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. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPdf
    Variant vJson
    Handle hoJson
    Variant vJsonOut
    Handle hoJsonOut
    Integer iFileSize
    Integer iEstimated
    String sTemp1
    Integer iTemp1

    Move False To iSuccess

    //  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

    Get Create (RefClass(cComChilkatPdf)) To hoPdf
    If (Not(IsComObjectCreated(hoPdf))) Begin
        Send CreateComObject of hoPdf
    End
    Get ComLoadFile Of hoPdf "qa_data/pdf/watersense_accomplishments.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonOut
    If (Not(IsComObjectCreated(hoJsonOut))) Begin
        Send CreateComObject of hoJsonOut
    End
    Get pvComObject of hoJson to vJson
    Get pvComObject of hoJsonOut to vJsonOut
    Get ComOptimize Of hoPdf "audit" vJson vJsonOut To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComIntOf Of hoJsonOut "fileSize" To iFileSize
    Get ComIntOf Of hoJsonOut "estimatedSavings.total" To iEstimated
    Showln "fileSize:  " iFileSize
    Showln "estimated: " iEstimated

    //  Only bother when at least a tenth of the file would go.
    If (iEstimated > (iFileSize / 10)) Begin
        Showln "Worth optimizing."
        Get pvComObject of hoJson to vJson
        Get pvComObject of hoJsonOut to vJsonOut
        Get ComOptimize Of hoPdf "optimize" vJson vJsonOut To iSuccess
        If (iSuccess = False) Begin
            Get ComLastErrorText Of hoPdf To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        Get ComWriteFile Of hoPdf "qa_output/watersense_optimized.pdf" To iSuccess
        If (iSuccess = False) Begin
            Get ComLastErrorText Of hoPdf To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        Get ComIntOf Of hoJsonOut "bytesSaved" To iTemp1
        Showln "bytesSaved: " iTemp1
    End
    Else Begin
        Showln "Already small enough; left as it is."
    End



End_Procedure