C 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. C

#include <C_CkPdf.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdf pdf;
    HCkJsonObject json;
    HCkJsonObject jsonOut;
    int i;
    int numSkipped;

    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

    pdf = CkPdf_Create();
    success = CkPdf_LoadFile(pdf,"qa_data/pdf/grand_canyon_hiking_guide.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        return;
    }

    //  Ask for the two options that are reserved for a later release.
    json = CkJsonObject_Create();
    CkJsonObject_UpdateBool(json,"mergeFontSubsets",TRUE);
    CkJsonObject_UpdateBool(json,"compactType1Fonts",TRUE);

    jsonOut = CkJsonObject_Create();
    success = CkPdf_Optimize(pdf,"audit",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    i = 0;
    numSkipped = CkJsonObject_SizeOfArray(jsonOut,"skipped");
    printf("skipped: %d\n",numSkipped);
    while (i < numSkipped) {
        CkJsonObject_putI(jsonOut,i);
        printf("   %s - %s\n",CkJsonObject_stringOf(jsonOut,"skipped[i].option"),CkJsonObject_stringOf(jsonOut,"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.


    CkPdf_Dispose(pdf);
    CkJsonObject_Dispose(json);
    CkJsonObject_Dispose(jsonOut);

    }