I've created a script that lets you preview each event on a track, and then assign region names from pre-configured combo boxes. It is pretty much working, except for one thing. If a region has previously been assigned to an event, I get an error message, and the script stops. The error message is:

"Error: failed to add marker, one may already exist at that position."

Is it possible to test whether a region has already been assigned to an event? If not, is there a simple error handler routine I could use? I am not too familiar with jscript (which is what I am using).

Here is the relevant code. The dialog box code mentioned above is finished, but not included here. This code fragment simply plays the video for each event and then assigns a machine-generated region name. It works fine, except for the problem mentioned above.

/** 

* PURPOSE OF THIS SCRIPT:

*

* This script creates a region for every event on the selected track. 

* As it creates each reagion, it lets you name that region.

* Each event is optionally previewed for five seconds. //this version plays entire clip

* You can use the combo boxes to add fixed text strings to the region names.

* The region number will be appended to each region name to ensure unique names.

*

* Dialog box code to actually add region names is in another script, 

* and will be added later.

*

* Written By: John Meyer

* November 5, 2003

*

**/ 



import System;

import System.IO;

import System.Collections;

import System.Text;

import System.Windows.Forms;

import SonicFoundry.Vegas;

import System.Threading;



var evnt     : TrackEvent;

var myRegion : Region;

var i        : Double;

var dLength  : Double;



try {



  //Clear all regions (Use this code if I can't solve region conflict problem)

  //Vegas.Project.Regions.Clear();



  //Find the selected event

  var track = FindSelectedTrack();

  if (null == track)

      throw "no selected track";



  var eventEnum = new Enumerator(track.Events);

  while (!eventEnum.atEnd()) {

    evnt = TrackEvent(eventEnum.item());

    dLength = evnt.Length.ToMilliseconds();



    // Preview the video (change sleep value to change playback rate)

    // Change For loop and dLength multiplier to play only portions of event.

    for (i = 0; i <= 10; i++) {

      Vegas.Cursor = evnt.Start + new Timecode(0.1 * i * dLength); 

      Thread.Sleep(35);

      Vegas.UpdateUI(); 

    }



    //Insert a region over this event. Name the region "hello 1", "hello 2", etc.)



// *** Here is where error occurs. If region has already been assigned to this event,

//     I get an error message and the routine stops.



    myRegion = new Region(evnt.Start,evnt.Length,"hello " + evnt.Index.ToString()); 

    Vegas.Project.Regions.Add(myRegion);

    eventEnum.moveNext();



  }





} catch (e) {

    MessageBox.Show(e);

}





function FindSelectedTrack() : Track {

  var trackEnum = new Enumerator(Vegas.Project.Tracks);

  while (!trackEnum.atEnd()) {

    var track : Track = Track(trackEnum.item());

    if (track.Selected) {

        return track;

    }

    trackEnum.moveNext();

  }

  return null;

}