DataFlex Requires Chilkat v11.7.0+

Optimizing an Encrypted PDF

See more PDF Optimization Examples

Demonstrates optimizing a PDF that is encrypted. Set the password before loading, exactly as for any other operation; the optimized PDF keeps the security it had, so the output still needs the same password. Because Chilkat honours the permissions recorded in the document, optimizing requires owner rights or the "modify" permission: a PDF opened with a user password that forbids modification can be audited but not optimized. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPdf
    Variant vJson
    Handle hoJson
    Variant vJsonOut
    Handle hoJsonOut
    Handle hoNoPassword
    Variant vQ
    Handle hoQ
    Variant vQ
Out    Handle hoQOut
    Handle hoWithPassword
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    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 encrypted_user_password.pdf

    Get Create (RefClass(cComChilkatPdf)) To hoPdf
    If (Not(IsComObjectCreated(hoPdf))) Begin
        Send CreateComObject of hoPdf
    End

    //  The password must be set before loading.
    Set ComUserPassword Of hoPdf To "secret"
    Get ComLoadFile Of hoPdf "qa_data/pdf/encrypted_user_password.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  What security does the file have, and may it be modified?
    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 ComProtection Of hoPdf "getInfo" vJson vJsonOut To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComBoolOf Of hoJsonOut "loaded.encrypted" To bTemp1
    Showln "encrypted: " bTemp1
    Get ComStringOf Of hoJsonOut "loaded.method" To sTemp1
    Showln "method:    " sTemp1
    Get ComStringOf Of hoJsonOut "loaded.openedWith" To sTemp1
    Showln "openedWith: " sTemp1
    Get ComBoolOf Of hoJsonOut "loaded.permissions.modify" To bTemp1
    Showln "may modify: " bTemp1

    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/encrypted_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

    //  The output is still encrypted with the same security: loading it without the password fails.
    Get Create (RefClass(cComChilkatPdf)) To hoNoPassword
    If (Not(IsComObjectCreated(hoNoPassword))) Begin
        Send CreateComObject of hoNoPassword
    End
    Get ComLoadFile Of hoNoPassword "qa_output/encrypted_optimized.pdf" To iSuccess
    Get Create (RefClass(cComChilkatJsonObject)) To hoQ
    If (Not(IsComObjectCreated(hoQ))) Begin
        Send CreateComObject of hoQ
    End
    Get Create (RefClass(cComChilkatJsonObject)) To hoQOut
    If (Not(IsComObjectCreated(hoQOut))) Begin
        Send CreateComObject of hoQOut
    End
    Get pvComObject of q to q
    Get pvComObject of hoQOut to vQOut
    Get ComExtractText Of hoNoPassword "assess" q vQOut To iSuccess
    Get ComBoolOf Of hoQOut "quality.passwordRequired" To bTemp1
    Showln "passwordRequired without the password: " bTemp1

    //  With the password it reads normally.
    Get Create (RefClass(cComChilkatPdf)) To hoWithPassword
    If (Not(IsComObjectCreated(hoWithPassword))) Begin
        Send CreateComObject of hoWithPassword
    End
    Set ComUserPassword Of hoWithPassword To "secret"
    Get ComLoadFile Of hoWithPassword "qa_output/encrypted_optimized.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoWithPassword To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComNumPages Of hoWithPassword To iTemp1
    Showln "pages: " iTemp1


End_Procedure