197 lines
3.3 KiB
Groff
197 lines
3.3 KiB
Groff
'\" t
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.\" Title: xquerydevicestate
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.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
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.\" Date: 08/04/2010
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.\" Manual: [FIXME: manual]
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.\" Source: [FIXME: source]
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.\" Language: English
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.\"
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.TH "XQUERYDEVICESTATE" "libmansuffix" "08/04/2010" "[FIXME: source]" "[FIXME: manual]"
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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XQueryDeviceState \- query the state of an extension input device\&.
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.SH "SYNOPSIS"
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.sp
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.nf
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#include <X11/extensions/XInput\&.h>
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.fi
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.sp
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.nf
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XDeviceState* XQueryDeviceState( Display *display,
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XDevice *device);
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.fi
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.sp
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.nf
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display
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Specifies the connection to the X server\&.
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.fi
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.sp
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.nf
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device
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Specifies the device whose state is to be queried\&.
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.fi
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.SH "DESCRIPTION"
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.if n \{\
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.RS 4
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.nf
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The XQueryDeviceState request queries the state of an input
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device\&. The current state of keys and buttons (up or down), and
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valuators (current value) on the device is reported by this
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request\&. Each key or button is represented by a bit in the
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XDeviceState structure that is returned\&. Valuators on the
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device report 0 if they are reporting relative information, and
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the current value if they are reporting absolute information\&.
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.fi
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.if n \{\
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.RE
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.\}
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.if n \{\
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.RS 4
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.nf
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XQueryDeviceState can generate a BadDevice error\&.
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.if n \{\
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.RE
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.\}
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.if n \{\
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.RS 4
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.\}
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.nf
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Structures:
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.if n \{\
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.if n \{\
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.RS 4
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.\}
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.nf
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The XDeviceState structure contains:
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.if n \{\
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.RE
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.\}
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.if n \{\
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.RS 4
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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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XInputClass *data;
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} XDeviceState;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XValuatorState structure contains:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.nf
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typedef struct {
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unsigned char class;
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unsigned char length;
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unsigned char num_valuators;
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unsigned char mode;
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int *valuators;
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} XValuatorState;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XKeyState structure contains:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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typedef struct {
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unsigned char class;
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unsigned char length;
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short num_keys;
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char keys[32];
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} XKeyState;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XButtonState structure contains:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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typedef struct {
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unsigned char class;
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unsigned char length;
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short num_buttons;
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char buttons[32];
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} XButtonState;
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.fi
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.if n \{\
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.RE
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.\}
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.SH "DIAGNOSTICS"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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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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.fi
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.if n \{\
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.RE
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.\}
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