To send an acknowledge signal to an extended input device,
use
XHPAcknowledge.
int XHPAcknowledge(display, deviceid, acknowledge)
Display *display;
XID deviceid;
unsigned int acknowledge; |
Title not available (Sending an Acknowledge to Extended Input Devices )
- display
Specifies the connection to the X server.
- deviceid
Specifies the ID of the desired device.
- acknowledge
Specifies the acknowledge to be sent. Valid values
are: GENERAL_ACKNOWLEDGE,
ACKNOWLEDGE_1,
ACKNOWLEDGE_2,
ACKNOWLEDGE_3,
ACKNOWLEDGE_4,
ACKNOWLEDGE_5,
ACKNOWLEDGE_6,
and ACKNOWLEDGE_7.
XHPAcknowledge
sends an acknowledge to an input device. For example, you can use
this function to turn off the LED on the HP 46086A 32-button box.
The io_byte field of the XHPDeviceList
structure (which is returned by the XHPListInputDevices
function) reports which prompts and acknowledges are supported by
the device. Bit 7 of the io_byte field
corresponds to GENERAL_ACKNOWLEDGE,
while bits 6, 5, and 4 are taken as a number between 1 and 7, meaning
that acknowledges numbered 1 through that number are supported.
XHPAcknowledge
can generate BadDevice
and BadValue
errors.
