85 lines
2.4 KiB
Plaintext
85 lines
2.4 KiB
Plaintext
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XQUERYDEVICESTATE(libmansuffix)
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===============================
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NAME
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----
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XQueryDeviceState - query the state of an extension input
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device.
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SYNOPSIS
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--------
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#include <X11/extensions/XInput.h>
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XDeviceState* XQueryDeviceState( Display *display,
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XDevice *device);
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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 state is to be queried.
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DESCRIPTION
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-----------
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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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XQueryDeviceState can generate a BadDevice error.
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Structures:
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The XDeviceState structure contains:
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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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The XValuatorState structure contains:
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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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The XKeyState structure contains:
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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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The XButtonState structure contains:
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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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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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