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6399848
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0
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1
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2011-06-19T00:45:02.783
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2011-06-19T01:03:55.690
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2011-06-19T01:03:55.690
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323339
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2
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This problem is because some com classes or interfaces like in the <code>DirectShowLib</code> should be just accessed from the same thread that it was created on. So the solution to this problem is to implement <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.isynchronizeinvoke.aspx" rel="nofollow">ISynchronizeInvoke</a> "System.ComponentModel.ISynchronizeInvoke". For example if you need to access methods in the class named <code>Media</code> that uses internally some classes or methods from the <code>DirectshowLib</code> in multithreading mode, you have to check if invoke required by using <code>InvokeRequired</code> and if true you have to access it via <code>Invoke</code> method. To demonstrate how to implement <code>ISynchronizeInvoke</code> interface here is a snippet from a code that I develop some time ago in C# 2.0 <pre><code>public abstract class Media : ISynchronizeInvoke { //.... private readonly System.Threading.SynchronizationContext _currentContext = System.Threading.SynchronizationContext.Current; private readonly System.Threading.Thread _mainThread = System.Threading.Thread.CurrentThread; private readonly object _invokeLocker = new object(); //.... #region ISynchronizeInvoke Members public bool InvokeRequired { get { return System.Threading.Thread.CurrentThread.ManagedThreadId != this._mainThread.ManagedThreadId; } } /// <summary> /// This method is not supported! /// </summary> /// <param name="method"></param> /// <param name="args"></param> /// <returns></returns> [Obsolete("This method is not supported!", true)] public IAsyncResult BeginInvoke(Delegate method, object[] args) { throw new NotSupportedException("The method or operation is not implemented."); } /// <summary> /// This method is not supported! /// </summary> /// <param name="method"></param> /// <param name="args"></param> /// <returns></returns> [Obsolete("This method is not supported!", true)] public object EndInvoke(IAsyncResult result) { throw new NotSupportedException("The method or operation is not implemented."); } public object Invoke(Delegate method, object[] args) { if (method == null) { throw new ArgumentNullException("method"); } lock (_invokeLocker) { object objectToGet = null; SendOrPostCallback invoker = new SendOrPostCallback( delegate(object data) { objectToGet = method.DynamicInvoke(args); }); _currentContext.Send(new SendOrPostCallback(invoker), method.Target); return objectToGet; } } public object Invoke(Delegate method) { return Invoke(method, null); } #endregion//ISynchronizeInvoke Members } </code></pre>
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1. PODirectshow filter access threading
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1. USJalal Said
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1. CO@Herman: did you try this? does it solved your problem?
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