C++/VB - Are there resources about implementing an IKsPropertySet or IKsControl on a PushSource Filter?

Asked By Thomas Franck

22-May-07 10:05 AM

Hi...

I've been roaming through so many 'net-pages and help files, maybe I'm
getting blind... I can't seem to find any examples..

I'm not a very proficient guy on this topic, so I need help.. :)

According to The March Hare's FAQ you will need some info to be able to
point me in the right direction:

I am using the DirectX 9.0 December 2004 SDK with VC8.0 and the Windows
Vista Platform SDK.

I started off with the PushSource example and ended up with a working
implementation of a OSD.. problem is: that OSD needs to be controllable.
So I added a method to which my app was supposed to talk to the filter to
say like "display text xyz"... of course that didn't work - The filter
stub doesn't know about the method.. so I looked for other ways.. SDK
says use IKsPropertySet or better (if I got that right) IKsControl.. very
little documentation on the first and almost none on the latter..

A few posts I found pointed to the Gargle Filter sample.. but that seems
to be over the top.. I don't need a PropertyPage - just means for my app
to influence the filter (programmatically).. besides, it doesn't use
IKsPropertySet..

Maybe I'm on the wrong track with that and should try to implement these
custom interfaces?

Is there a website or book I should read to help my grasp the idea of
implementing Interfaces?

Thanks for reading this far.. I appreciate that. :)
--
Thomas

22-May-07 11:17 AM

Look at the ezrgb sample.  Besides having a property page, which you don't
need, it implements a simple custom interface.


Right.


The filter wizard on my site includes a skeleton custom interface.
However, it only works with VC7.1 since they changed the plug-in model for
VC8.

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23-May-07 06:22 AM

Thanks.. I did that and it helped.. up to a point.
My Filter has a custom interface now and compiles just fine.
Problem I have now is that I can't Query the Filter for it in my app,
because it says "unresolved external symbol" for the IID..

The Interface header contains just this (plus the #if statements from the
ezrgb sample):

// {2F58AAAF-02D1-4dfa-AA27-04D71B65E9EF}
DEFINE_GUID(IID_IBCC_OSD,
0x2f58aaaf, 0x2d1, 0x4dfa, 0xaa, 0x27, 0x4, 0xd7, 0x1b, 0x65, 0xe9,
0xef);

DECLARE_INTERFACE_(IBCC_OSD, IUnknown)
{
STDMETHOD(set_BaseImage) (THIS_
LPCTSTR FileName	// OSD Base Image Path
) PURE;
};



this is in the Graph header file:

CComPtr <IBaseFilter>	m_pBCC_OSD;    	//The OSD PushSource
CComPtr <IBCC_OSD>	m_pIBCC_OSD;    	//The OSD Interface

which compiles ok.. (include path is set right)

and the graph.cpp file has this:
[Instantiate the Filter and add it to the Filter]
hr = m_pBCC_OSD->QueryInterface(IID_IBCC_OSD,(void **) &m_pIBCC_OSD);

which doesn't compile, giving the "LNK2001: unresolved external symbol"
error for _IID_IBCC_OSD

Oh, right.. the lib file is in the Linker settings.

As I ran out of thoughts, I added the IID to the .def file.. the app
compiled then.. but of course couldn't load the dll...

Now back to the net.. Any guess on what I missed doing?



Okay.. your point is very clear on that... :)

cheers,
--
Thomas

23-May-07 09:28 AM

just before the inlcude of the header file with the interface definition

Iain

23-May-07 02:46 PM

This is covered in my FAQ and the dshow docs FAQ (and Iain pointed you to
it).

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24-May-07 02:35 AM

40tude.net:


Bummer.... That one must have slipped my reading... :(

It compiles okay now...

Thanks again, and sorry for the noise..
--
Thomas

31-May-07 10:38 AM

No problem.  Thanks for following up.

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