On Fri, Nov 14, 2008 at 6:22 PM, Spencer, Matthew <[EMAIL PROTECTED]> wrote: > The problem I have with that approach however is that the elements will > be set to NULL after passing ownership to the bin, so I can no longer > use them in the functions. What I need is the ability to pass ownership > and change them into weak references for the rest of the function scope. > I don't suppose there is any way of achieving this is there?
With bin.add you take a ref of the element so you can keep them using in your function. Gr, Thijs > Matt > > -----Original Message----- > From: Thijs Vermeir [mailto:[EMAIL PROTECTED] > Sent: 14 November 2008 17:15 > To: Spencer, Matthew > Cc: vala-list@gnome.org > Subject: Re: [Vala] Problem with gstreamer bin > > On Fri, Nov 14, 2008 at 6:12 PM, Spencer, Matthew <[EMAIL PROTECTED]> > wrote: >> I thought it was something like this. Thanks for the feedback, this >> has fixed the problem. >> >> Reading through the documents, shouldn't I be able to do something > like: >> >> bin.add_many(#element1,#element2,#elemenr3) >> >> To indicate to valac the passing of ownership to the bin? > > Yes, that should also work. > > Gr, > Thijs > >> >> Matt >> >> -----Original Message----- >> From: Thijs Vermeir [mailto:[EMAIL PROTECTED] >> Sent: 14 November 2008 17:07 >> To: Spencer, Matthew >> Cc: vala-list@gnome.org >> Subject: Re: [Vala] Problem with gstreamer bin >> >> Hi, >> >> 2008/11/14 Spencer, Matthew <[EMAIL PROTECTED]>: >>> Hi Guys >>> >>> I am playing with Vala with a view to presenting information about it > >>> at our companies developer conference in a couple of weeks. With >>> this >> >>> in mind I am trying to build up a test application that shows video >>> playback using GStreamer. I am having problems with the following >> code: >>> >>> private Element createVideoBin() { >>> var bin=new Bin("videobin"); >>> var queue=ElementFactory.make("queue","queue"); >>> var sink=ElementFactory.make("autovideosink","videosink"); >>> var ghostPad=new GhostPad("sink",queue.get_pad("sink")); >>> bin.add_many(queue,sink); >>> queue.link(sink); >>> bin.add_pad(ghost); >>> return(bin); >>> } >> >> bin.add_many is the problem because the c function takes the >> ownership, but the bindings don't do it. Just use bin.add for every >> element as a workaround... >> >> Gr, >> Thijs >> >>> When attempting to use the returned bin, I get a segfault. This is >>> because (I think, on examining the generated C code) the elements are > >>> being unrefd before the bin is returned. I am sure this is not >> supposed to happen. >>> >>> I get a number of error messaged when running the app: >>> (mystreamer:16361): GStreamer-CRITICAL **: >>> Trying to dispose of object "videosink", but it still has a parent >>> "videobin". >>> You need to let the parent manage the object instead of unreffing the > >>> object directly. >>> >>> I am assuming this is because I need to inform the code that I wish >>> to >> >>> transfer ownership of the objects to the 'Bin', but how do I do this, > >>> and is there a way that this can be picked up by the compiler to >>> prevent this type of problem? >>> >>> Cheers >>> >>> Matt >>> ********************************************************************* >>> * >>> *********************************** >>> This e-mail is confidential, the property of NDS Ltd and intended for > >>> the addressee only. 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