Method

ALSACtlCardread_elem_value

Declaration [src]

gboolean
alsactl_card_read_elem_value (
  ALSACtlCard* self,
  const ALSACtlElemId* elem_id,
  ALSACtlElemValue* const* elem_value,
  GError** error
)

Description [src]

Read given value from element indicated by the given identifier.

The call of function executes ioctl(2) system call with SNDRV_CTL_IOCTL_ELEM_READ command for ALSA control character device.

Parameters

`elem_id`	`ALSACtlElemId`
	A `ALSACtlElemId`.
	The data is owned by the caller of the function.
`elem_value`	`ALSACtlElemValue`
	A derivative of `ALSACtlElemValue`.
	The argument will be modified by the function.
	The instance takes ownership of the data, and is responsible for freeing it.
`error`	`GError **`
	The return location for a `GError*`, or `NULL`.

Return value

Returns:	`gboolean`
	`TRUE` when the overall operation finishes successfully, else `FALSE`.