Swift Requires Chilkat v11.7.0+

Why a PDF Optimization Was Skipped

See more PDF Optimization Examples

Demonstrates the "skipped" array, which lists the options that were asked for but not applied, each with a reason and, where it is page-specific, the pages. An option is skipped when it is reserved for a later release (mergeFontSubsets, compactType1Fonts), when the rules of the file forbid it (objectStreams in a PDF/A-1 file), or when the content could not be parsed safely (tidyContent and coalesceContent on a page whose content stream the parser does not understand). Nothing is ever changed on a guess: an option that cannot be applied safely is skipped and reported. Swift

func chilkatTest() {
    var success: Bool = 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

    let pdf = CkoPdf()!
    success = pdf.loadFile(filePath: "qa_data/pdf/grand_canyon_hiking_guide.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    //  Ask for the two options that are reserved for a later release.
    let json = CkoJsonObject()!
    json.updateBool(jsonPath: "mergeFontSubsets", value: true)
    json.updateBool(jsonPath: "compactType1Fonts", value: true)

    let jsonOut = CkoJsonObject()!
    success = pdf.optimize(op: "audit", jsonIn: json, jsonOut: jsonOut)
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    var i: Int = 0
    var numSkipped: Int = jsonOut.size(ofArray: "skipped").intValue
    print("skipped: \(numSkipped)")
    while i < numSkipped {
        jsonOut.i = i
        print("   \(jsonOut.string(of: "skipped[i].option")!) - \(jsonOut.string(of: "skipped[i].reason")!)")
        i = i + 1
    }

    //  A skipped option is not a failure: Optimize returns true, the other options are applied, and the
    //  report says exactly what was left undone.

}