man NJB_Release (Fonctions bibliothèques) - Capture or release an NJB
NAME
NJB_Capture, NJB_Release - Capture or release an NJB
LIBRARY
libnjb
SYNOPSIS
#include <libnjb.h>
extern int njb_error
NJB_Capture (njb_t *njb)
NJB_Release (njb_t *njb)
DESCRIPTION
The NJB_Capture function "captures" the NJB device, which locks out the control buttons on the device itself. Any attempt to use the NJB controls directly will result in a "HOST IS IN CONTROL" message on the LCD screen.
Capturing the NJB is an essential part of the session, since you want to ensure that only the controlling software can modify the contents of the device.
*njb must be an njb object that was previously opened via NJB_Open(3).
To release the NJB, use the NJB_Release command.
RETURN VALUES
Both functions return 0 upon success, and return -1 and set njb_error on failure:
- EO_USBCTL
- An I/O error occured when speaking on the control pipe
- EO_BADSTATUS
- The NJB returned a "failure" status in response to the capture or release command.