Re: Video Source dialogs in Direct Show

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The March Hare [MVP] wrote: 
On Mon, 23 May 2005 10:14:01 -0400, Jonathan Arnold wrote:


Does it work in the AMCap sample?  If not, it sounds like a bug in VEO's
driver.


It does work fine.  I think I did figure out the problem though. I was
completely tearing down the graph before showing the Source dialog, then
rebuilding it afterwards.  Like I said, this has worked for all other
cameras before, but not for the VEO.  I see in AMCAP that it merely stops
the preview. I stopped tearing down the graph and now the changes stick.



Thanks for posting your resolution.  IMO, all driver writers should have a
Set As Default button on the dialog since dshow doesn't have a way of
setting all the custom properties on a capture device.


Yeah, there is the interesting tidbit in the DirectShow docs about this:

Note   Although many of the filters provided with DirectShow support
property pages, they are intended for debugging purposes, and are not
recommended for application use. In most cases the equivalent
functionality is provided through a custom interface on the filter. An
application should control these filters programatically, rather than
expose their property pages to users.


I'm not sure what is meant by "In most cases the equivalent functionality"
or how you are supposed to go about finding it out in a general sort of
way.  As far as I can tell, everyone just puts up this property page,
although some do embed it in their own dialog box.

--
Jonathan Arnold
inSORS
.

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