To turn on a prompt on an extended input device, use
XHPPrompt.
int XHPPrompt(display, deviceid, prompt)
Display *display;
XID deviceid;
unsigned int prompt; |
Title not available (Sending a Prompt to Extended Input Devices )
- display
Specifies the connection to the X server.
- deviceid
Specifies the ID of the desired device.
- prompt
Specifies the prompt to be sent. Valid values are:
GENERAL_PROMPT,
PROMPT_1, PROMPT_2,
PROMPT_3, PROMPT_4,
PROMPT_5, PROMPT_6,
and PROMPT_7.
XHPPrompt
sends a prompt to an input device. For example, you can use this
function to turn on 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_PROMPT,
while bits 6, 5, and 4 are taken as a number between 1 and 7, meaning
that prompts numbered 1 through that number are supported.
XHPPrompt
can generate BadDevice
and BadValue
errors.
Printable version
