Batch font face and size change

Question

Hi everybody,
I'm looking to create a batch action/script the will select and change the font face and size in a series of .eps files of barcodes.
I'm not sure if it's a scripting thing because I've never scripted before.
If anyone could point me in the right direction or tell me how to do it (action or script)  I'd be very grateful.
(Each image contains the barcode and three text elements, all Helvetica 24pt which I want to change to OCRB 18.5pt, on about 120 images)
Thanks chaps

Answer 1

Try something like this
#target illustrator
app.userInteractionLevel = UserInteractionLevel.DONTDISPLAYALERTS;
Validate User Input.
function validateInput()
     if(dlg.input_panel.input_edt.text == "")
            alert("Error, please define an input directory to convert.", "Error:");
            return -1;
    return 0   
Define input Directory
function getInput()
    var input_folder = Folder.selectDialog( 'Select the directory where you wish to open the files: ', '' );
    if (input_folder != null)
        dlg.input_panel.input_edt.text = input_folder.fsName;
Open an eps file
function openFile(open_file)
    var open_options = new OpenOptions();
    open_options.updateLegacyText = true;
    app.open(open_file, DocumentColorSpace.RGB,open_options);
@Return return the index on the system for a font
function getIndex()
    var fontIndex = -1;
    for(var i=0; i<app.textFonts.length; i++)
            if(app.textFonts[i].name == "ArialNarrow-Bold")
                    fontIndex = i;
    return fontIndex;
Loop through text and change type
function changeText()
    var index_value = getIndex();
    if(index_value > 0)
        var grayColour = new GrayColor();
        grayColour.gray = 100;
        for (var i = 0; i< app.activeDocument.textFrames.length; i++)
                app.activeDocument.textFrames[i].textRange.characterAttributes.textFont = app.textFonts[index_value];
                app.activeDocument.textFrames[i].textRange.characterAttributes.kerningMethod = AutoKernType.AUTO;
                app.activeDocument.textFrames[i].textRange.characterAttributes.size = 10;
            app.activeDocument.textFrames[i].textRange.characterAttributes.fillColor = grayColour;
                for(var j=0; j<app.activeDocument.textFrames[i].textRange.characters.length; j++)
                    app.activeDocument.textFrames[i].textRange.characters[j].characterAttributes.baselineShif t = 0;
                    app.activeDocument.textFrames[i].textRange.characters[j].characterAttributes.leading = 12;
                    app.activeDocument.textFrames[i].textRange.characters[j].characterAttributes.tracking = 0
                    app.activeDocument.textFrames[i].textRange.characters[j].characterAttributes.rotation = 0;
                    app.activeDocument.textFrames[i].textRange.characters[j].characterAttributes.horizontalSc ale= 100;
                    app.activeDocument.textFrames[i].textRange.characters[j].characterAttributes.verticalScal e= 100;
            redraw();
        for( var i=0 ; i < app.activeDocument.textFrames.length; i++ )
            for ( p=0 ; p < app.activeDocument.textFrames[i].paragraphs.length ; p++ )
                app.activeDocument.textFrames[i].paragraphs[p].justification = Justification.CENTER;
                app.activeDocument.textFrames[i].paragraphs[p].selection = true;
        alert("Finished");
    else
        alert("Arial Narrow Bold is not installed on your system!", "Error:");
Save and close File
function saveFile()
    app.activeDocument.close(SaveOptions.SAVECHANGES);
Main
function main()
    if(validateInput() == -1)
        return;
    var input_folder = new Folder(dlg.input_panel.input_edt.text);
    var files_array = input_folder.getFiles( '*.eps' );
    logStatus ("c:\\boarder_report.csv", "SIZE", "FILE NAME", "STATUS");
    logStatus ("c:\\boarder_report.csv", "SIZE", "FILE NAME", "STATUS");
    for(var i = 0; i <= files_array.length; i++)
openFile(new File(files_array[i]));
changeText()
        saveFile();
    alert("Done Processing Files");
Create GUI
function buildGUI()
    dlg = new Window('dialog', 'RPSTL Add Box Tool', [100,100,480,225]);
    dlg.input_panel = dlg.add('panel',[5,10,375,80], 'Input Directory');
    dlg.input_panel.input_txt = dlg.input_panel.add('statictext', [10,12,125,25], 'Browse for Input  Directory:');
    dlg.input_panel.input_btn = dlg.input_panel.add('button', [10,30,110,50], 'Browse');
    dlg.input_panel.input_edt = dlg.input_panel.add('edittext', [120,30,350,50], '');
    dlg.start_btn = dlg.add('button', [250,85,375,110], 'Start Conversion');
    dlg.input_panel.input_btn.onClick = getInput;
    dlg.start_btn.onClick = main;
    dlg.show();
buildGUI();