127 lines
4.7 KiB
Groff
127 lines
4.7 KiB
Groff
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.\"
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.\" $XFree86: xc/doc/man/Xi/XOpenDev.man,v 1.2 2001/01/27 18:20:21 dawes Exp $
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.\"
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.\"
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.\" Copyright ([\d,\s]*) by Hewlett-Packard Company, Ardent Computer,
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this documentation
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.\" for any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\" Ardent, and Hewlett-Packard make no representations about the
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.\" suitability for any purpose of the information in this document. It is
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.\" provided \`\`as is'' without express or implied warranty.
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.\"
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.\" $Xorg: XOpenDev.man,v 1.3 2000/08/17 19:41:56 cpqbld Exp $
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.ds xL Programming with Xlib
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.TH XOpenDevice 3X11 __xorgversion__ "X FUNCTIONS"
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.SH NAME
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XOpenDevice, XCloseDevice \- open or close an extension input device
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.SH SYNTAX
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.HP
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XDevice *XOpenDevice\^(\^Display *\fIdisplay\fP\^, XID \fIdevice_id\fP\^);
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.HP
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XCloseDevice\^(\^Display *\fIdisplay\fP\^, XDevice *\fIdevice\fP\^);
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.fi
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\fP
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.SH ARGUMENTS
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.TP 12
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.I display
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Specifies the connection to the X server.
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.TP 12
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.I device_id
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Specifies the id of the device to be opened
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.TP 12
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.I device
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Specifies the device to be closed
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.SH DESCRIPTION
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The \fIXOpenDevice\fP
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request makes an input device accessible to a client through input extension
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protocol requests. If successful, it returns a pointer to an \fBXDevice\fP
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structure.
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.LP
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The \fIXCloseDevice\fP request makes an input device inaccessible to a
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client through input extension protocol requests. Before terminating,
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and client that has opened input devices through the input extension
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should close them via \fICloseDevice\fP.
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.LP
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When a client makes an \fIXCloseDevice\fP request,
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any active grabs that the client has on the device are
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released. Any event selections that the client has are deleted, as well as
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any passive grabs. If the requesting client is the last client accessing
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the device, the server may disable all access by X to the device.
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.LP
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\fIXOpenDevice\fP and \fIXCloseDevice\fP can generate a \fIBadDevice\fP
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error.
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.SH STRUCTURES
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The
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\fIXDevice\fP structure returned by \fIXOpenDevice\fP contains:
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.nf
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typedef struct {
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XID device_id;
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int num_classes;
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XInputClassInfo *classes;
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} XDevice;
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.fi
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.LP
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The classes field is a pointer to an array of XInputClassInfo structures.
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Each element of this array contains an event type base for a class of input
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supported by the specified device. The num_classes field indicates the
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number of elements in the classes array.
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.LP
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The
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\fIXInputClassInfo\fP
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structure contains:
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.LP
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.nf
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typedef struct {
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unsigned char input_class;
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unsigned char event_type_base;
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} XInputClassInfo;
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.fi
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.LP
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The input_class field identifies one class of input
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supported by the device. Defined types include \fIKeyClass\fP,
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\fIButtonClass\fP, \fIValuatorClass\fP, \fIProximityClass\fP,
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\fIFeedbackClass\fP, \fIFocusClass\fP, and \fIOtherClass\fP.
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The event_type_base identifies the event type of the first event in that class.
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.LP
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The information contained in the \fIXInputClassInfo\fP structure is used
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by macros to obtain the event classes that clients use in making
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\fIXSelectExtensionEvent\fP requests. Currently defined macros include
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\fIDeviceKeyPress\fP, \fIDeviceKeyRelease\fP, \fIDeviceButtonPress\fP,
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\fIDeviceButtonRelese\fP, \fIDeviceMotionNotify\fP, \fIDeviceFocusIn\fP,
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\fIDeviceFocusOut\fP, \fIProximityIn\fP, \fIProximityOut\fP,
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\fIDeviceStateNotify\fP, \fIDeviceMappiingNotify\fP,
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\fIChangeDeviceNotify\fP, \fIDevicePointerMotionHint\fP,
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\fIDeviceButton1Motion\fP, \fIDeviceButton2Motion\fP, \fIDeviceButton3Motion\fP,
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\fIDeviceButton4Motion\fP, \fIDeviceButton5Motion\fP, \fIDeviceButtonMotion\fP,
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\fIDeviceOwnerGrabButton\fP, \fIDeviceButtonPressGrab\fP, and
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\fINoExtensionEvent\fP.
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.LP
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To obtain the proper event class for a particular device, one of the above
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macros is invoked using the \fIXDevice\fP structure for that device. For
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example,
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.LP
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.nf
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DeviceKeyPress (*device, type, eventclass);
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.fi
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.LP
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returns the \fIDeviceKeyPress\fP event type and the eventclass for
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\fIDeviceKeyPress\fP events from the specified device.
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.LP
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This \fIeventclass\fP can then be used in an \fIXSelectExtensionEvent\fP
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request to ask the server to send \fIDeviceKeyPress\fP events from this device.
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When a selected event is received via \fIXNextEvent\fP, the \fItype\fP can be
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used for comparison with the type in the event.
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.SH DIAGNOSTICS
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.TP 12
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\fIBadDevice\fP
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An invalid device was specified. The specified device does not exist,
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or is the X keyboard or X pointer. This error may
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also occur if some other client has caused the specified device to become
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the X keyboard or X pointer device via the \fIXChangeKeyboardDevice\fP or
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\fIXChangePointerDevice\fP requests.
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.SH "SEE ALSO"
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.br
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\fI\*(xL\fP
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