Save PNG with measurements in file name

[maria0101]

Is it possible to have the file open in Photoshop and use the overall width and height of the canvas size in millimetres saved in the file name? Perhaps it could save to the desktop so then I could drag it into the folder I need. Ideally it would be saved as something like, "123x321" width by height, without any decimal points. Usually I select the canvas and use info to get the measurements and input the details in myself but I make some mistakes this way.

Many thanks in advance

[varDale_undefined]

This is an example script that can do what you like.

It keeps the current name, so you can tweak that as required:

#target photoshop
var strtRuler = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
var doc = app.activeDocument;
var dName = doc.name;
var dNameNoExt = dName.replace (".png","");
try{var dPath = doc.path;}
catch(e){var dPath = Folder.selectDialog( "Where would you like to save the image?");};
app.preferences.rulerUnits = strtRuler
 var aFolder= Folder (dPath + "/" + "Saved")
 if (!aFolder.exists) aFolder.create();
var pngOptions = new PNGSaveOptions();
with (pngOptions) {
    embedColorProfile = true;
    compression = 6
    interlaced = false
    };
var dDims = [doc.height] + [doc.width];
 doc.saveAs((File(aFolder + "/ " + dNameNoExt + dDims)),pngOptions,true);   
 doc.close(SaveOptions.DONOTSAVECHANGES);

[r-bin · Accepted solution]

var pth = "~/Desktop"; // path to save the file, the default save to the desktop, change as needed
var tmp = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.MM;
var w = Math.round(activeDocument.width.value);
var h = Math.round(activeDocument.height.value);
var file = new File(pth+ "/" + w+"x"+h + ".png");
app.preferences.rulerUnits = tmp;
save_as_png(file);
alert("File was saved as\n\n" + file.fsName);
function save_as_png(file, filter, none, comp)
    {
    try {
        if (filter == undefined) filter = "PNGFilterAdaptive";
        if (none == undefined) none = true;
        if (comp == undefined) comp = 9;
        var d = new ActionDescriptor();
        var d1 = new ActionDescriptor();
        if (none)
            d1.putEnumerated(stringIDToTypeID("PNGInterlaceType"), stringIDToTypeID("PNGInterlaceType"), stringIDToTypeID("PNGInterlaceNone"));
        else
            d1.putEnumerated(stringIDToTypeID("PNGInterlaceType"), stringIDToTypeID("PNGInterlaceType"), stringIDToTypeID("PNGInterlaceAdam7"));
        d1.putEnumerated(stringIDToTypeID("PNGFilter"), stringIDToTypeID("PNGFilter"), stringIDToTypeID(filter));
        d1.putInteger(stringIDToTypeID("compression"), comp);
        d.putObject(stringIDToTypeID("as"), stringIDToTypeID("PNGFormat"), d1);
        d.putPath(stringIDToTypeID("in"), file);
        d.putBoolean(stringIDToTypeID("copy"), true);
        executeAction(stringIDToTypeID("save"), d, DialogModes.NO);
        }
    catch (e) { alert(e); throw(e); }
    }

upd. was edited

[maria0101]

Thanks so much guys. It was a bit of a struggle for me to tweek varDale's script even though it was really good. Thanks again, I really appreciate it