Unicode C Requires Chilkat v11.7.0+

PDF Object Streams: generate, preserve or disable

See more PDF Optimization Examples

Demonstrates the objectStreams option. An object stream packs many small objects (dictionaries, not stream data) into one compressed stream, which is usually a worthwhile saving in a document with many pages or tags. "generate" (the default) packs them and writes a cross-reference stream; "preserve" keeps the file as it is -- packed if it already was, not packed if it was not; "disable" writes every object on its own with a classic cross-reference table, which is what a PDF 1.4 reader needs. Object streams require PDF 1.5 and are skipped for PDF/A-1. Unicode C

#include <C_CkFileAccessW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkPdfW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkFileAccessW fac;
    HCkJsonObjectW json;
    HCkJsonObjectW jsonOut;
    HCkPdfW pdf1;
    HCkPdfW pdf2;
    HCkPdfW pdf3;

    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

    fac = CkFileAccessW_Create();
    json = CkJsonObjectW_Create();
    jsonOut = CkJsonObjectW_Create();

    //  generate: pack the objects (the default).
    pdf1 = CkPdfW_Create();
    success = CkPdfW_LoadFile(pdf1,L"qa_data/pdf/grand_canyon_hiking_guide.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf1));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        return;
    }

    CkJsonObjectW_UpdateString(json,L"objectStreams",L"generate");
    success = CkPdfW_Optimize(pdf1,L"optimize",json,jsonOut);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf1));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        return;
    }

    success = CkPdfW_WriteFile(pdf1,L"qa_output/grand_canyon_objstm_generate.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf1));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        return;
    }

    wprintf(L"generate: %d bytes, objects packed: %d\n",CkFileAccessW_FileSize(fac,L"qa_output/grand_canyon_objstm_generate.pdf"),CkJsonObjectW_IntOf(jsonOut,L"actions.objectStreams.count"));

    //  disable: every object on its own, with a classic cross-reference table.
    pdf2 = CkPdfW_Create();
    success = CkPdfW_LoadFile(pdf2,L"qa_data/pdf/grand_canyon_hiking_guide.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf2));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        CkPdfW_Dispose(pdf2);
        return;
    }

    CkJsonObjectW_UpdateString(json,L"objectStreams",L"disable");
    success = CkPdfW_Optimize(pdf2,L"optimize",json,jsonOut);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf2));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        CkPdfW_Dispose(pdf2);
        return;
    }

    success = CkPdfW_WriteFile(pdf2,L"qa_output/grand_canyon_objstm_disable.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf2));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        CkPdfW_Dispose(pdf2);
        return;
    }

    wprintf(L"disable:  %d bytes\n",CkFileAccessW_FileSize(fac,L"qa_output/grand_canyon_objstm_disable.pdf"));

    //  preserve: leave the file's own structure alone.  Use it when the output must stay readable by
    //  whatever reads the input today.
    pdf3 = CkPdfW_Create();
    success = CkPdfW_LoadFile(pdf3,L"qa_data/pdf/grand_canyon_hiking_guide.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf3));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        CkPdfW_Dispose(pdf2);
        CkPdfW_Dispose(pdf3);
        return;
    }

    CkJsonObjectW_UpdateString(json,L"objectStreams",L"preserve");
    success = CkPdfW_Optimize(pdf3,L"optimize",json,jsonOut);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf3));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        CkPdfW_Dispose(pdf2);
        CkPdfW_Dispose(pdf3);
        return;
    }

    success = CkPdfW_WriteFile(pdf3,L"qa_output/grand_canyon_objstm_preserve.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf3));
        CkFileAccessW_Dispose(fac);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkPdfW_Dispose(pdf1);
        CkPdfW_Dispose(pdf2);
        CkPdfW_Dispose(pdf3);
        return;
    }

    wprintf(L"preserve: %d bytes\n",CkFileAccessW_FileSize(fac,L"qa_output/grand_canyon_objstm_preserve.pdf"));


    CkFileAccessW_Dispose(fac);
    CkJsonObjectW_Dispose(json);
    CkJsonObjectW_Dispose(jsonOut);
    CkPdfW_Dispose(pdf1);
    CkPdfW_Dispose(pdf2);
    CkPdfW_Dispose(pdf3);

    }