JavaScript Requires Chilkat v11.7.0+

Why a PDF Optimization Was Skipped

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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. JavaScript

var success = 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

var pdf = new CkPdf();
success = pdf.LoadFile("qa_data/pdf/grand_canyon_hiking_guide.pdf");
if (success == false) {
    console.log(pdf.LastErrorText);
    return;
}

//  Ask for the two options that are reserved for a later release.
var json = new CkJsonObject();
json.UpdateBool("mergeFontSubsets",true);
json.UpdateBool("compactType1Fonts",true);

var jsonOut = new CkJsonObject();
success = pdf.Optimize("audit",json,jsonOut);
if (success == false) {
    console.log(pdf.LastErrorText);
    return;
}

var i = 0;
var numSkipped = jsonOut.SizeOfArray("skipped");
console.log("skipped: " + numSkipped);
while (i < numSkipped) {
    jsonOut.I = i;
    console.log("   " + jsonOut.StringOf("skipped[i].option") + " - " + jsonOut.StringOf("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.