Unicode C++ Requires Chilkat v11.7.0+

Tile a Watermark Across a PDF Page

See more PDF Watermark Examples

Demonstrates a tiled watermark, which repeats the stamp over the whole page instead of placing it once. Tiling overrides position.align; tile.spacingX and spacingY set the gaps, and tile.stagger offsets alternate rows by half a tile so the pattern does not line up in columns. A faint tiled stamp carrying the name or address is the usual way to mark a document so that a leaked copy can be traced back, and zOrder back keeps it behind the text where it does not hinder reading. Unicode C++

#include <CkPdfW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    bool 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 long_report.pdf

    CkPdfW pdf;
    success = pdf.LoadFile(L"qa_data/pdf/long_report.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        return;
    }

    CkJsonObjectW json;
    json.UpdateString(L"type",L"text");

    //  {date:FORMAT} is replaced per page when the watermark is added.  The other placeholders are
    //  {page}, {pages} and {filename}; {{ gives a literal brace.
    json.UpdateString(L"text",L"jdoe@example.com  {date:yyyy-MM-dd}");
    json.UpdateString(L"id",L"trace");
    json.UpdateString(L"zOrder",L"back");
    json.UpdateNumber(L"font.size",L"14");
    json.UpdateNumber(L"opacity",L"0.15");
    json.UpdateNumber(L"rotation",L"30");

    json.UpdateBool(L"tile.enabled",true);
    json.UpdateNumber(L"tile.spacingX",L"60");
    json.UpdateNumber(L"tile.spacingY",L"80");
    json.UpdateBool(L"tile.stagger",true);

    CkJsonObjectW jsonOut;
    success = pdf.Watermark(L"add",json,jsonOut);
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        return;
    }

    wprintf(L"id: %s pages: %s\n",jsonOut.stringOf(L"id"),jsonOut.stringOf(L"pages"));

    success = pdf.WriteFile(L"qa_output/report_traced.pdf");
    if (success == false) {
        wprintf(L"%s\n",pdf.lastErrorText());
        return;
    }

    //  Sample output:

    //  id: trace pages: 1-3
    }