On Wed, 2017-10-18 at 17:29 +0900, Shinnosuke Suzuki wrote: > Dear tanu, > > > Are the two pa_context pointers different? You should have just one > > context. > > Yes, I called function like this in the stream callback: (s : pa_stream *s) > switch(pa_stream_get_state){ > case PA_STREAM_FAILED: > printf("%s\n, pa_strerror(pa_context_errno(s)); > printf("%s\n, pa_strerror(pa_context_errno(pa_stream_get_context(s)))); > I check the argument, first one is wrong argument, so I got error "Invalid > argument" in second printf(). Doesn't your compiler warn you about passing an argument of wrong type to pa_context_errno()? The function expects a pa_context object, but in the first case you're passing it a pa_stream object. -- Tanu https://www.patreon.com/tanuk