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MTAThread

Posted on 2004-09-24
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Last Modified: 2010-04-15
I have an application that must use the MTAThreadAttribute.  My problem is that it appears that I cannot use the Windows Media Player activex control in a MTAThreaded application.  I keep getting the following error:

An unhandled exception of type 'System.Threading.ThreadStateException' occurred in system.windows.forms.dll

Additional information: Could not instantiate ActiveX control '6bf52a52-394a-11d3-b153-00c04f79faa6' because the current thread is not in a single-threaded apartment.

Is there any way around this problem?????  Does the Media Player control have to be used in a Single Threaded Application???

Thanks,
Kendal
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Question by:gvector1
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Expert Comment

by:eternal_21
ID: 12144605
Why must your application use the MTAThreadAttribute?
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Author Comment

by:gvector1
ID: 12144711
Because I am writing a media application that is making use of some code written by Idael Cardoso and Ianier Munoz.  The majority of it is a WMF SDK translation that Idael Cardoso wrote in which makes available the Windows Media Format to managed code.  His code can be found here : http://www.codeproject.com/cs/media/ManWMF.asp?select=932380&df=100&forumid=39102&msg=932380
Some of the media code uses multithreading.  Any suggestions?????????

Thanks,
Kendal
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Expert Comment

by:eternal_21
ID: 12145332
I wonder if your could putting a [STAThread] on your InitializeComponents method of your form would help (or wherever your AxtiveX control is instatntiated).
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Author Comment

by:gvector1
ID: 12228125
I am sorry it took so long to get back.  I got caught up on an important project.  I tried using the [STAThread] on the InitializeComponents method fo my for and I still got the same error as above.  Any other suggestions as to how I could approach this problem.

Thanks for the assistance,
Kendal
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Author Comment

by:gvector1
ID: 12309670
I found an approach that was suggested to me on the CodeProject Website.  Here is the link
http://www.codeproject.com/cs/media/ManWMF.asp?select=932972&forumid=39102&df=100#xx932972xx

Thanks again,
kendal
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