[alsa-devel] Alsa Callbacks and C++ classes

Takashi Iwai tiwai at suse.de
Mon Apr 21 17:55:09 CEST 2008

At Sun, 20 Apr 2008 21:28:25 -0500,
Reuben Martin wrote:
> Hello all,
> I have an AES32 sound card that I am trying to write a general control 
> interface for using qt4. I'm wanting to register callbacks so that the 
> interface will reflect changes made by other apps. Now I'm not entirely up to 
> speed on the API, but from what I can gather, the callback can be registered 
> to call a regular function, or to change a public class variable.
> Since I decided to use qt4, everything is in classes. Is there any way to have 
> the callback trigger a public class function? I guess I don't understand why 
> you would want to use a public variable instead. Wouldn't you have to set up 
> a means within the class to continually pole the variable to see if it has 
> been changed? Or can the option to call a regular function be used to call a 
> public class function as well?

Well, which callback do you have in your mind?  A bit more
specificically please...


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