Change Export Raster Resolution?

Question

Hello,
I am trying to use JavaScript to export layers to PNG... I have a working script, that is basically the same as the example in the Adobe Illustrator CS5 JavaScript Reference:
function exportFileToPNG24 (dest) {
     if ( app.documents.length > 0 ) {
          var exportOptions = new ExportOptionsPNG24();
          var type = ExportType.PNG24;
          var fileSpec = new File(dest);
          exportOptions.antiAliasing = false;
          exportOptions.transparency = false;
          exportOptions.saveAsHTML = true;
          app.activeDocument.exportFile( fileSpec, type, exportOptions );
However, this will only export the document to 72ppi, and I don't see anywhere in ExportOptionsPNG24 to change this.
If you use Illustrator's UI, instead of scripting, and select File > Export... You get the option to select Screen (72ppi), Medium (150ppi), High (300ppi) or Other.
I found the DocumentRasterResolution constant in the reference, but I can't figure out how to change, or even access the constant?
I assume if I could reset the constant like:
DocumentRasterResolution = 3;
then the above script would export the file to a PNG @ 300 ppi?

Answer 1

It appears as though the DocumentRasterResolution constant is only referenced by the DocumentPreset object.
The DocumentPreset object appears to be used when you attempt to create a document with script:
app.documents.addDocument( DocumentPreset );
So, I suppose in theory I could recreate the document entirely with script and then reset the preset raster resolution:
DocumentPreset.rasterResolution = DocumentRasterResolution;
Buuuuuut, screw that.
Scaling it is... apparently.