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snd_ctl_mixer_switch_read()

Get a mixer switch setting

Synopsis:

#include <sys/asoundlib.h >

int snd_ctl_mixer_switch_read(
       snd_ctl_t *handle,
        int dev,
        snd_switch_t * sw )

Arguments:

handle

The handle for the control device. This must have been created by snd_ctl_open().

dev

The mixer device the switches apply to.

sw

A pointer to a snd_switch_t structure that snd_ctl_mixer_switch_read() fills with information about the switch.

Library:

libasound.so

Description:

The snd_ctl_mixer_switch_read() function reads the snd_switch_t structure for the switch identified by the name member of the structure.

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You must initialize the name member before calling this function.

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Returns:

Zero on success, or a negative value if an error occurs.

Errors:

-EINVAL

Invalid handle argument.

-ENXIO

The group wasn't found.

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes

See also:

snd_mixer_groups(), mix_ctl.c application example source code

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