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X11R7.4 - man page for xquerydevicestate (x11r4 section 3)

XQueryDeviceState(3)			   X FUNCTIONS			     XQueryDeviceState(3)

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

SYNTAX
       int XQueryDeviceState(Display *display, XDevice *device);

ARGUMENTS
       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  infor-
       mation, 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  XChangePointer-
		   Device requests.

SEE ALSO
       Programming with Xlib

X Version 11				   libXi 1.2.1			     XQueryDeviceState(3)


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