QTExporter.BeginExport blocks UI thread even when run in background thread

• Subject: QTExporter.BeginExport blocks UI thread even when run in background thread
• From: "Jonathan Resnick" <email@hidden>
• Date: Wed, 31 May 2006 22:47:12 -0400
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I am using the Quicktime COM API via C#, and I need to use the
QTExporter to export a movie file.  I would like to provide my own
progress dialog to the user, rather than using the built-in progress
dialog.

Contrary to what the name would seem to indicate, the
QTExporter.BeginExport method blocks for the duration of the export
process.  Even when I try running it in a background thread (using the
System.ComponentModel.BackgroundWorker object), the UI remains
unresponsive during the export process.  Is there a way to prevent
this?  My code is as follows:

                   QTQuickTime qt = _quickTime.QuickTime;

                   // create exporter
                   if (qt.Exporters.Count == 0) qt.Exporters.Add();
                   _exporter = qt.Exporters[1];

                   // Set exporter type: AVI, 3G, MPEG-4, PNG, etc.
                   _exporter.TypeName = "QuickTime Movie";

                   // add event listeners

_exporter.EventListeners.Add(QTEventClassesEnum.qtEventClassProgress,
QTEventIDsEnum.qtEventExportProgress, 0, null);

                   _exporter.ShowProgressDialog = false;

               _exporter.SetDataSource(_quickTime.Movie);
               _exporter.DestinationFileName = _exportFile;
               _exporter.BeginExport();

Any help would be greatly appreciated.

Thanks,
-Jonathan
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