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POProperly dispose QuickTime control
 

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    <p>I'm currently developing an application for Windows platform that will be able to play Quick Time videos. The targeted OS versions are Windows XP, Windows Vista and Windows 7.</p> <p>I successfully used the Apple ActiveX QuickTime Control 2.0 (in C#) and everything works well on Windows XP.</p> <p>However, on Vista and Windows 7 I'm facing problems with properly disposing the control. Here are the "steps to reproduce" : - I create the Quick Time control dynamically at runtime and I place it on a panel;</p> <ul> <li><p>I successfully play videos with it;</p></li> <li><p>At some point I close the application main form; the application windows is destroyed and the application will continue to run in the background (doing operations like syncing videos); at this point the control is disposed using IDisposable pattern; I can't explicitly dispose the Movie object (from the ActiveX control) because I get an exception like: "COM object that has been separated from its underlying RCW cannot be used."; I just use (AxQTOControlLib.AxQTControl) player.Dispose(); On Windows XP this is fine but not on Vista and 7</p></li> <li><p>I restore my application (from tool bar where it was running in background) and try to open the video again; At this point an AccessViolationException "Attempted to read/write protected memory" is thrown;</p></li> </ul> <p>My questions are:</p> <ul> <li><p>Why is this happening only on Vista and Windows 7 ?</p></li> <li><p>On XP is a hidden leak ?</p></li> <li><p>What is the recommended way to dispose the control (with its movie object) when it is created at runtime ?</p></li> </ul> <p>I'm now using an explicit Movie.Disconnect() call (although I don't now what this disconnect means because I could not find proper documentation) fallowed by a QuickTimeTerminate() call before the form is closed. While my method is working it is kind of design breaking so I would like to know a better way of doing this.</p> <p>Thank you, Mosu'</p> <p>Update: I just discovered that my method is not workink. I use to players: QuickTime control and Windows Media player control (both ActiveX) and when one fails to play a file the other one is used. I was seeing the output of WindowsMedia player and thinking the methos IS working. So my fix is not working at all. </p>
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    1. COYuck, quite a crummy control. Try hiding your form instead of disposing it.
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    2. COThanks for reply. I can't do this because all the other controls (including the panel the control sits on) are being disposed. The application is in a mature state. I have been asked to added this features. So this is not an option.
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    3. COI've got the same issue unfortunately
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