Hi:
I'm confused by a problem when i modify a test application "alsa-lib-1.0.13/test/control.c".
I wanna use the structure "snd_ctl_elem_value_t",but when i write like this:
snd_ctl_elem_value_t aaa;
there will be an error:
storage size of 'aaa' isn't known
while
snd_ctl_elem_value_t *aaa;
makes no errors. But i can't change it directly such as:
aaa->id=test_id ; //test_id is defined before
cause it will bring an error:
dereferencing pointer to incomplete type
I think i should use the function like "snd_ctl_elem_info_set_id",but i just want to know why,i don't think it disobeys the C syntax.Is there something different in the ALSA making procedure?or Makefile?
haoshun
2008-04-03
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