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'\" t
.\" Title: xgetdevicecontrol
.\" Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 05/04/2023
.\" Manual: \ \&
.\" Source: \ \&
.\" Language: English
.\"
.TH "XGETDEVICECONTROL" "libmansuffix" "05/04/2023" "\ \&" "\ \&"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
XGetDeviceControl, XChangeDeviceControl \- query and change input device controls
.SH "SYNOPSIS"
.sp
.nf
#include <X11/extensions/XInput\&.h>
.fi
.sp
.nf
XDeviceControl *XGetDeviceControl( Display *display,
XDevice *device,
int *controlType);
.fi
.sp
.nf
int XChangeDeviceControl( Display *display,
XDevice *device,
int controlType,
XDeviceControl *control);
.fi
.sp
.nf
display
Specifies the connection to the X server\&.
.fi
.sp
.nf
device
Specifies the device whose control is to be interrogated
or modified\&.
.fi
.sp
.nf
controlType
Specifies the type of control to be interrogated or
changed\&.
.fi
.sp
.nf
control
Specifies the address of an XDeviceControl structure
that contains the new values for the Device\&.
.fi
.SH "DESCRIPTION"
.sp
.if n \{\
.RS 4
.\}
.nf
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\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
Valid device control types that can be used with these requests
include the following:
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
DEVICE_RESOLUTION: Queries or changes the resolution of
valuators on input devices\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
The XGetDeviceControl request returns a pointer to an
XDeviceControl structure\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XGetDeviceControl can generate a BadDevice or BadMatch error\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
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\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XChangeDeviceControl can generate a BadDevice, BadMatch, or
BadValue error\&.
.fi
.if n \{\
.RE
.\}
.SH "STRUCTURES"
.sp
.if n \{\
.RS 4
.\}
.nf
Each control is described by a structure specific to that control\&.
These structures are defined in the file XInput\&.h\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
XDeviceControl is a generic structure that contains two fields
that are at the beginning of each class of control:
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
typedef struct {
XID class;
int length;
} XDeviceControl;
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
The XDeviceResolutionState structure defines the information
that is returned for device resolution for devices with
valuators\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
typedef struct {
XID control;
int length;
int num_valuators;
int* resolutions;
int* min_resolutions;
int* max_resolutions;
} XDeviceResolutionState;
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
The XDeviceResolutionControl structure defines the attributes
that can be controlled for keyboard Devices\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
typedef struct {
XID control;
int length;
int first_valuator;
int num_valuators;
int* resolutions;
} XDeviceResolutionControl;
.fi
.if n \{\
.RE
.\}
.SH "DIAGNOSTICS"
.sp
.if n \{\
.RS 4
.\}
.nf
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\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
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\&.
.fi
.if n \{\
.RE
.\}
.sp
.if n \{\
.RS 4
.\}
.nf
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\*(Aqs type is accepted\&. Any
argument defined as a set of alternatives can generate
this error\&.
.fi
.if n \{\
.RE
.\}
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