C Requires Chilkat v11.7.0+

Deflate Compression Level When Optimizing a PDF

See more PDF Optimization Examples

Demonstrates compressionLevel, which is the deflate level (1 to 9, 9 by default) used for every stream the optimizer re-encodes. Level 9 is the smallest and the slowest; level 1 is the quickest. The difference is usually a percent or two, so level 9 is the right default for a file that will be downloaded many times, and a lower level is worth considering only when a server optimizes PDFs on the fly. A value outside 1 to 9 is an error. C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkFileAccess fac;
    HCkJsonObject json;
    HCkJsonObject jsonOut;
    HCkPdf pdf1;
    HCkPdf pdf9;
    HCkPdf pdfBad;

    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 watersense_accomplishments.pdf

    fac = CkFileAccess_Create();
    json = CkJsonObject_Create();
    jsonOut = CkJsonObject_Create();

    pdf1 = CkPdf_Create();
    success = CkPdf_LoadFile(pdf1,"qa_data/pdf/watersense_accomplishments.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf1));
        CkFileAccess_Dispose(fac);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(pdf1);
        return;
    }

    CkJsonObject_UpdateInt(json,"compressionLevel",1);
    success = CkPdf_Optimize(pdf1,"optimize",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf1));
        CkFileAccess_Dispose(fac);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(pdf1);
        return;
    }

    success = CkPdf_WriteFile(pdf1,"qa_output/watersense_level1.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf1));
        CkFileAccess_Dispose(fac);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(pdf1);
        return;
    }

    printf("level 1: %d\n",CkFileAccess_FileSize(fac,"qa_output/watersense_level1.pdf"));

    pdf9 = CkPdf_Create();
    success = CkPdf_LoadFile(pdf9,"qa_data/pdf/watersense_accomplishments.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf9));
        CkFileAccess_Dispose(fac);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(pdf1);
        CkPdf_Dispose(pdf9);
        return;
    }

    CkJsonObject_UpdateInt(json,"compressionLevel",9);
    success = CkPdf_Optimize(pdf9,"optimize",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf9));
        CkFileAccess_Dispose(fac);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(pdf1);
        CkPdf_Dispose(pdf9);
        return;
    }

    success = CkPdf_WriteFile(pdf9,"qa_output/watersense_level9.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf9));
        CkFileAccess_Dispose(fac);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(pdf1);
        CkPdf_Dispose(pdf9);
        return;
    }

    printf("level 9: %d\n",CkFileAccess_FileSize(fac,"qa_output/watersense_level9.pdf"));

    //  A level outside 1..9 fails, and LastErrorText says why.
    pdfBad = CkPdf_Create();
    success = CkPdf_LoadFile(pdfBad,"qa_data/pdf/watersense_accomplishments.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdfBad));
        CkFileAccess_Dispose(fac);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        CkPdf_Dispose(pdf1);
        CkPdf_Dispose(pdf9);
        CkPdf_Dispose(pdfBad);
        return;
    }

    CkJsonObject_UpdateInt(json,"compressionLevel",12);
    success = CkPdf_Optimize(pdfBad,"optimize",json,jsonOut);
    if (success == FALSE) {
        printf("compressionLevel 12 was refused, as it should be.\n");
    }



    CkFileAccess_Dispose(fac);
    CkJsonObject_Dispose(json);
    CkJsonObject_Dispose(jsonOut);
    CkPdf_Dispose(pdf1);
    CkPdf_Dispose(pdf9);
    CkPdf_Dispose(pdfBad);

    }