2010-05-18 13:28:54 -06:00
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XGETDEVICECONTROL(libmansuffix)
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===============================
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NAME
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----
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XGetDeviceControl, XChangeDeviceControl - query and change
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input device controls
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SYNOPSIS
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--------
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#include <X11/extensions/XInput.h>
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XDeviceControl *XGetDeviceControl( Display *display,
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XDevice *device,
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int *controlType);
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int XChangeDeviceControl( Display *display,
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XDevice *device,
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int controlType,
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XDeviceControl *control);
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display
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Specifies the connection to the X server.
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device
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Specifies the device whose control is to be interrogated
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or modified.
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controlType
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Specifies the type of control to be interrogated or
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changed.
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control
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Specifies the address of an XDeviceControl structure
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that contains the new values for the Device.
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DESCRIPTION
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-----------
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These requests are provided to manipulate those input devices
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that support device control. A BadMatch error will be generated
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if the requested device does not support any device controls.
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Valid device control types that can be used with these requests
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include the following:
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2013-05-31 09:15:07 -06:00
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DEVICE_RESOLUTION: Queries or changes the resolution of
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2010-05-18 13:28:54 -06:00
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valuators on input devices.
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The XGetDeviceControl request returns a pointer to an
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XDeviceControl structure.
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XGetDeviceControl can generate a BadDevice or BadMatch error.
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The XChangeDeviceControl request modifies the values of one
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control on the specified device. The control is identified by
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the id field of the XDeviceControl structure that is passed
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with the request.
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XChangeDeviceControl can generate a BadDevice, BadMatch, or
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BadValue error.
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STRUCTURES
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----------
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Each control is described by a structure specific to that control.
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These structures are defined in the file XInput.h.
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2010-05-18 13:28:54 -06:00
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XDeviceControl is a generic structure that contains two fields
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that are at the beginning of each class of control:
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typedef struct {
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XID class;
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int length;
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} XDeviceControl;
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The XDeviceResolutionState structure defines the information
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that is returned for device resolution for devices with
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valuators.
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typedef struct {
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XID control;
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int length;
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int num_valuators;
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int* resolutions;
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int* min_resolutions;
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int* max_resolutions;
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} XDeviceResolutionState;
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The XDeviceResolutionControl structure defines the attributes
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that can be controlled for keyboard Devices.
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typedef struct {
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XID control;
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int length;
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int first_valuator;
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int num_valuators;
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int* resolutions;
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} XDeviceResolutionControl;
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DIAGNOSTICS
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-----------
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BadDevice
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An invalid device was specified. The specified device
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does not exist or has not been opened by this client via
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XOpenInputDevice. This error may also occur if some
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other client has caused the specified device to become
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the X keyboard or X pointer device via the
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XChangeKeyboardDevice or XChangePointerDevice requests.
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BadMatch
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This error may occur if an XGetDeviceControl request was
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made specifying a device that has no controls or an
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XChangeDeviceControl request was made with an
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XDeviceControl structure that contains an invalid Device
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type. It may also occur if an invalid combination of
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mask bits is specified ( DvKey but no DvAutoRepeatMode
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for keyboard Devices), or if an invalid KeySym is
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specified for a string Device.
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BadValue
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Some numeric value falls outside the range of values
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accepted by the XChangeDeviceControl request. Unless a
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specific range is specified for an argument, the full
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range defined by the argument's type is accepted. Any
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argument defined as a set of alternatives can generate
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this error.
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