Windows Media Player Control does not close file handles

[harsman]

If I use the Windows Media Player ActiveX control as an embedded media player in my application, some file handles pointing to the media file remain open after the control has closed. They aren't closed until the Dyalog process shuts down.

I'm not sure if this is because Dyalog doesn't shut down the WMP ActiveX control properly or because of something else. There is no way to explicitly tell the control to close all files as far as I can tell.

Code: Select all

 ∇
 wmptest
 'player'⎕WC'Form'('Coord' 'Pixel')('Size' 48 400)('Event' 'Close' 'wmpoff')
 'wmp'⎕WC'OCXClass' 'Windows Media Player'
 'player.wmp'⎕WC'wmp'
 player.wmp.Open⊂'C:\path\to\wav\file'
 
 ∇
 wmpoff msg
 ⎕EX'wmp'
 ⎕EX'player'


By using Process Explorer I can see that calling the Open method opens four handles to the file, and closing the player window closes two of them. If I force close the remaining open handles from Process Explorer nothing bad seems to happen.

Anyone have any ideas?

[Vince|Dyalog]

Hi Joakim,

We are unable to reproduce this issue. I tried under XP and JD tried under Windows 7.

In Process Explorer, I saw 2 handles open under XP, and JD saw one under Windows 7. When the form was closed, we both saw no handles open.

You can also use filemon to see the open and close operations on the file.

Regards,

Vince

[harsman]

Interesting, I will try it under XP and Win 7 again with the latest version to try and reproduce. Could be some other program (eg AntiVirus) causing this I suppose.