1XQUERYDEVICESTATE(3) XQUERYDEVICESTATE(3)
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6 XQueryDeviceState - query the state of an extension input device.
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9 #include <X11/extensions/XInput.h>
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11 XDeviceState* XQueryDeviceState( Display *display,
12 XDevice *device);
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14 display
15 Specifies the connection to the X server.
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17 device
18 Specifies the device whose state is to be queried.
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21 The XQueryDeviceState request queries the state of an input
22 device. The current state of keys and buttons (up or down), and
23 valuators (current value) on the device is reported by this
24 request. Each key or button is represented by a bit in the
25 XDeviceState structure that is returned. Valuators on the
26 device report 0 if they are reporting relative information, and
27 the current value if they are reporting absolute information.
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29 XQueryDeviceState can generate a BadDevice error.
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31 Structures:
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33 The XDeviceState structure contains:
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35 typedef struct {
36 XID device_id;
37 int num_classes;
38 XInputClass *data;
39 } XDeviceState;
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41 The XValuatorState structure contains:
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43 typedef struct {
44 unsigned char class;
45 unsigned char length;
46 unsigned char num_valuators;
47 unsigned char mode;
48 int *valuators;
49 } XValuatorState;
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51 The XKeyState structure contains:
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53 typedef struct {
54 unsigned char class;
55 unsigned char length;
56 short num_keys;
57 char keys[32];
58 } XKeyState;
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60 The XButtonState structure contains:
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62 typedef struct {
63 unsigned char class;
64 unsigned char length;
65 short num_buttons;
66 char buttons[32];
67 } XButtonState;
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70 BadDevice
71 An invalid device was specified. The specified device
72 does not exist or has not been opened by this client via
73 XOpenInputDevice. This error may also occur if some
74 other client has caused the specified device to become
75 the X keyboard or X pointer device via the
76 XChangeKeyboardDevice or XChangePointerDevice requests.
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80 09/15/2021 XQUERYDEVICESTATE(3)