Hello
I have a C# desktop application in which one thread that I create continously gets an image from a
source(it's a digital camera actually) and puts it on a panel(panel.Image = img) in the GUI(which
must be another thread as it is the code-behind of a control.
The application works but on some machines I get the following error at random time
intervals(unpredictable)
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************** Exception Text **************
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System.InvalidOperationException: The object is currently in use elsewhere.
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Then the panel turns into a red cross, red X - i think this is the invalid picture icon that is
editable from the properties. The application keeps working but the panel is never updated
From what I can tell this error comes from the control's onpaint event where I draw something else
on the picture
I tried using a lock there but no luck :(
The way I call the function that puts the image on the panel is as follows:
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if (this.ReceivedFrame != null)
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{
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Delegate[] clients = this.ReceivedFrame.GetInvocationList();
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foreach (Delegate del in clients)
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{
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try
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{
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del.DynamicInvoke(new object[] { this, new StreamEventArgs(frame) });
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}
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catch { }
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}
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}
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this is the delegate:
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public delegate void ReceivedFrameEventHandler(object sender, StreamEventArgs e);
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public event ReceivedFrameEventHandler ReceivedFrame;
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and this is how the function inside the control code-behind registers to it:
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Camera.ReceivedFrame += new Camera.ReceivedFrameEventHandler(camera_ReceivedFrame);
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I also tried
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del.Method.Invoke(del.Target, new object[] { this, new StreamEventArgs(b) });
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instead of
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del.DynamicInvoke(new object[] { this, new StreamEventArgs(frame) });
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but no luck
Does anyone know how I could fix this error or at least catch the error somehow and make the thread put the images on the panel once again?
Can anyone help please? I am really stuck
Thank you in advance
