Adding a watermark from App-Level script

Question

Hello all,
  I've have a folder-level script that puts a button on the toolbar.  This button calls a function that will insert watermarks and append several PDF documents to the current one.  I've hit a roadblock with this.addWatermarkFromFile(). When the function is called an error is thrown that states the following:
TypeError: this.addWatermarkFromFile is not a function.
  Pasting a few lines from the function into the console and executing from there works… but it always bombs when executed from a function.
  The documentation states it requires priveleged functionality, which I provided.  My function looks like this:
function generateReport()
    app.beginPriv();
    this.addWatermarkFromFile(
        cDIPath:     strPathReportFront,
        nSourcePage: 0,
        nStart:      intPageReportFront,
        nEnd:        intPageReportFront
  //CODE CLIPPED FOR SAMPLE PURPOSE
  app.endPriv();
app.trustedFunction(generateReport);
Anyone know where I'm going wrong?

Answer 1

App-level scripts have no knowledge of your document, therefore you can't
use the "this" object like you do elsewhere.
You have to pass a reference to the document as a parameter, and then use it
in your function to call addWatermarkFromFile().