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XQUERYDEVICESTATE(3)					  XQUERYDEVICESTATE(3)

NAME
       XQueryDeviceState - query the state of an extension input device.

SYNOPSIS
       #include	<X11/extensions/XInput.h>

       XDeviceState* XQueryDeviceState(	Display	*display,
					XDevice	*device);

       display
	      Specifies	the connection to the X	server.

       device
	      Specifies	the device whose state is to be	queried.

DESCRIPTION
	   The XQueryDeviceState request queries the state of an input
	   device. The current state of	keys and buttons (up or	down), and
	   valuators (current value) on	the device is reported by this
	   request. Each key or	button is represented by a bit in the
	   XDeviceState	structure that is returned. Valuators on the
	   device report 0 if they are reporting relative information, and
	   the current value if	they are reporting absolute information.

	   XQueryDeviceState can generate a BadDevice error.

	   Structures:

	   The XDeviceState structure contains:

	   typedef struct {
	       XID device_id;
	       int num_classes;
	       XInputClass *data;
	   } XDeviceState;

	   The XValuatorState structure	contains:

	   typedef struct {
	       unsigned	char class;
	       unsigned	char length;
	       unsigned	char num_valuators;
	       unsigned	char mode;
	       int *valuators;
	   } XValuatorState;

	   The XKeyState structure contains:

	   typedef struct {
	       unsigned	char class;
	       unsigned	char length;
	       short	 num_keys;
	       char keys[32];
	   } XKeyState;

	   The XButtonState structure contains:

	   typedef struct {
	       unsigned	char class;
	       unsigned	char length;
	       short	 num_buttons;
	       char buttons[32];
	   } XButtonState;

DIAGNOSTICS
	   BadDevice
		  An invalid device was	specified. The specified device
		  does not exist or has	not been opened	by this	client via
		  XOpenInputDevice. This error may also	occur if some
		  other	client has caused the specified	device to become
		  the X	keyboard or X pointer device via the
		  XChangeKeyboardDevice	or XChangePointerDevice	requests.

				  03/09/2013		  XQUERYDEVICESTATE(3)

NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS

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