PDFOpenOptions issue with open(file, options)

Cool!

I had to figure some other things out like extracting the path from openDialog
which I didn't find anywhere else.

So it's finely time to share a decent and commented script (with the invaluable
help of Muppet Mark, thanks man!):

//This script is set to open pdf files,
//make 256x256px JPG duplicates,
//create a folder named zJPGs relative to the doc's path
//and save the files there
//Gustavo Soares,
//with the great help of Muppet Mark and many others
#target photoshop
//set units to pixels
app.preferences.rulerUnits = Units.PIXELS;
//avoid displaying dialog boxes
app.displayDialogs = DialogModes.NO;
//set background color to white
app.backgroundColor.rgb.red = 255;
app.backgroundColor.rgb.green = 255;
app.backgroundColor.rgb.blue = 255;
//define the pdf options for opening the document
var pdfOpenOptions = new PDFOpenOptions();
pdfOpenOptions.antiAlias = true;
pdfOpenOptions.mode = OpenDocumentMode.RGB;
pdfOpenOptions.bitsPerChannel = BitsPerChannelType.EIGHT;
pdfOpenOptions.resolution = 72;
pdfOpenOptions.supressWarnings = true;
pdfOpenOptions.cropPage = CropToType.TRIMBOX;
//pdfOpenOptions.page = 1
//Select files to batch ('true' is for aloowing multiple seleciont)
var fileList = File.openDialog("Select files to batch", true);
//Returns the dynamic path from the openDialog –
//there's certainly a better way for doing this
var fullPath = fileList[0];
var fullPathTemp = fullPath.fsName;
var sliceIndex = fullPathTemp.lastIndexOf ("/");
var docPath = fullPathTemp.slice(0, sliceIndex); //'0' means the beginning of the string
//Read the functions below to understand the loop
if (fileList != null) {
     for (var i in fileList) {
          if (fileList instanceof File && fileList.hidden == false) {
               open(fileList, pdfOpenOptions);
               jpg256();
               app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
          }
     }
alert("Done");
}
else {
     alert("No files selected");
}
//––––––––––––––––––––
//Functions start here
//––––––––––––––––––––
function jpg256() {     
     
     //make a 256 x 256px image of the original document
     var myDoc = app.activeDocument
     var docName = myDoc.name;
     //can use this for opening files with extension
     //var docNameChange = docName.slice(0, -4);
     var myNewDocName = docName + ".jpg";
     var myNewDoc = myDoc.duplicate(myNewDocName, true);
     var width = myNewDoc.width;
     var height = myNewDoc.height;
     
     //resize
     if (height >= width) {
          myNewDoc.resizeImage (null, 256, 72, ResampleMethod.BICUBICSHARPER); 
          // 'null' resizes proportionally
          myNewDoc.resizeCanvas (256, 256, AnchorPosition.MIDDLECENTER);
     } 
     else {
          myNewDoc.resizeImage (256, null, 72, ResampleMethod.BICUBICSHARPER); 
          // 'null' resizes proportionally
          myNewDoc.resizeCanvas (256, 256, AnchorPosition.MIDDLECENTER);
     }
     
     //save the file in a folder named 256x256
     //check if it exists, if it doesn't then create
     var jpegOptions = new JPEGSaveOptions();
     jpegOptions.quality = 7;
     
     var folder256 = docPath + "/zJPGs";
     if (Folder(folder256).exists) {
          save256();
     }
     else {
          var fldr = new Folder(folder256);
          fldr.create();
          save256();
     }
     function save256() {
          myNewDoc.saveAs(new File(folder256), jpegOptions);
          myNewDoc.close(SaveOptions.DONOTSAVECHANGES);
     }
}