C Requires Chilkat v11.7.0+

Audit a PDF First, Optimize Only If It Is Worth It

See more PDF Optimization Examples

Demonstrates deciding whether to rewrite a PDF at all. "audit" costs a fraction of a second and changes nothing, so a batch job can audit every file and optimize only those where enough would be saved. Here the threshold is a tenth of the file; a file already as small as it can be is left alone. C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdf pdf;
    HCkJsonObject json;
    HCkJsonObject jsonOut;
    int fileSize;
    int estimated;

    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

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

    json = CkJsonObject_Create();
    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;
    }

    fileSize = CkJsonObject_IntOf(jsonOut,"fileSize");
    estimated = CkJsonObject_IntOf(jsonOut,"estimatedSavings.total");
    printf("fileSize:  %d\n",fileSize);
    printf("estimated: %d\n",estimated);

    //  Only bother when at least a tenth of the file would go.
    if (estimated > (fileSize / 10)) {
        printf("Worth optimizing.\n");
        success = CkPdf_Optimize(pdf,"optimize",json,jsonOut);
        if (success == FALSE) {
            printf("%s\n",CkPdf_lastErrorText(pdf));
            CkPdf_Dispose(pdf);
            CkJsonObject_Dispose(json);
            CkJsonObject_Dispose(jsonOut);
            return;
        }

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

        printf("bytesSaved: %d\n",CkJsonObject_IntOf(jsonOut,"bytesSaved"));
    }
    else {
        printf("Already small enough; left as it is.\n");
    }



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

    }