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CentOS 7.0 - man page for xgetdevicecontrol (centos section 3)

XGETDEVICECONTROL(3)							     XGETDEVICECONTROL(3)

NAME
       XGetDeviceControl, XChangeDeviceControl - query and change input device controls

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

       XDeviceControl *XGetDeviceControl( Display *display,
					  XDevice *device,
					  int *controlType);

       int XChangeDeviceControl( Display *display,
				 XDevice *device,
				 int controlType,
				 XDeviceControl *control);

       display
	      Specifies the connection to the X server.

       device
	      Specifies the device whose control is to be interrogated
	      or modified.

       controlType
	      Specifies the type of control to be interrogated or
	      changed.

       control
	      Specifies the address of an XDeviceControl structure
	      that contains the new values for the Device.

DESCRIPTION
	   These requests are provided to manipulate those input devices
	   that support device control. A BadMatch error will be generated
	   if the requested device does not support any device controls.

	   Valid device control types that can be used with these requests
	   include the following:

	   DEVICE_RESOLUTION: Queries or changes the resolution of
	   valuators on input devices.

	   The XGetDeviceControl request returns a pointer to an
	   XDeviceControl structure.

	   XGetDeviceControl can generate a BadDevice or BadMatch error.

	   The XChangeDeviceControl request modifies the values of one
	   control on the specified device. The control is identified by
	   the id field of the XDeviceControl structure that is passed
	   with the request.

	   XChangeDeviceControl can generate a BadDevice, BadMatch, or
	   BadValue error.

STRUCTURES
	   Each control is described by a structure specific to that control.
	   These structures are defined in the file XInput.h.

	   XDeviceControl is a generic structure that contains two fields
	   that are at the beginning of each class of control:

	   typedef struct {
	       XID class;
	       int length;
	   } XDeviceControl;

	   The XDeviceResolutionState structure defines the information
	   that is returned for device resolution for devices with
	   valuators.

	   typedef struct {
	       XID control;
	       int length;
	       int num_valuators;
	       int* resolutions;
	       int* min_resolutions;
	       int* max_resolutions;
	   } XDeviceResolutionState;

	   The XDeviceResolutionControl structure defines the attributes
	   that can be controlled for keyboard Devices.

	   typedef struct {
	       XID control;
	       int length;
	       int first_valuator;
	       int num_valuators;
	       int* resolutions;
	   } XDeviceResolutionControl;

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.

	   BadMatch
		  This error may occur if an XGetDeviceControl request was
		  made specifying a device that has no controls or an
		  XChangeDeviceControl request was made with an
		  XDeviceControl structure that contains an invalid Device
		  type. It may also occur if an invalid combination of
		  mask bits is specified ( DvKey but no DvAutoRepeatMode
		  for keyboard Devices), or if an invalid KeySym is
		  specified for a string Device.

	   BadValue
		  Some numeric value falls outside the range of values
		  accepted by the XChangeDeviceControl request. Unless a
		  specific range is specified for an argument, the full
		  range defined by the argument's type is accepted. Any
		  argument defined as a set of alternatives can generate
		  this error.

					    03/09/2013			     XGETDEVICECONTROL(3)


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