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- XQueryDeviceState(3X11) X FUNCTIONS XQueryDeviceState(3X11)
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- NNAAMMEE
- XQueryDeviceState - query the state of an extension input
- device.
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- SSYYNNTTAAXX
- XQueryDeviceState(_d_i_s_p_l_a_y, _d_e_v_i_c_e)
- Display *_d_i_s_p_l_a_y;
- XDevice *_d_e_v_i_c_e;
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- AARRGGUUMMEENNTTSS
- _d_i_s_p_l_a_y Specifies the connection to the X server.
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- _d_e_v_i_c_e Specifies the device whose state is to be
- queried.
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- DDEESSCCRRIIPPTTIIOONN
- The _X_Q_u_e_r_y_D_e_v_i_c_e_S_t_a_t_e request queries the state of an
- input device. The current state of keys and buttons (up
- or down), and valuators (current value) on the device is
- reported by this request. Each key or button is repre-
- sented by a bit in the _X_D_e_v_i_c_e_S_t_a_t_e structure that is
- returned. Valuators on the device report 0 if they are
- reporting relative information, and the current value if
- they are reporting absolute information.
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- _X_Q_u_e_r_y_D_e_v_i_c_e_S_t_a_t_e can generate a _B_a_d_D_e_v_i_c_e error.
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- SSTTRRUUCCTTUURREESS
- The _X_D_e_v_i_c_e_S_t_a_t_e structure contains:
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- typedef struct {
- XID device_id;
- int num_classes;
- XInputClass *data;
- } XDeviceState;
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- The _X_V_a_l_u_a_t_o_r_S_t_a_t_e structure contains:
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- typedef struct {
- unsigned char class;
- unsigned char length;
- unsigned char num_valuators;
- unsigned char mode;
- int *valuators;
- } XValuatorState;
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- The _X_K_e_y_S_t_a_t_e structure contains:
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- typedef struct {
- unsigned char class;
- unsigned char length;
- short num_keys;
- char keys[32];
- } XKeyState;
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- X Version 11 Release 6.1 1
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- XQueryDeviceState(3X11) X FUNCTIONS XQueryDeviceState(3X11)
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- The _X_B_u_t_t_o_n_S_t_a_t_e structure contains:
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- typedef struct {
- unsigned char class;
- unsigned char length;
- short num_buttons;
- char buttons[32];
- } XButtonState;
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- DDIIAAGGNNOOSSTTIICCSS
- _B_a_d_D_e_v_i_c_e An invalid device was specified. The speci-
- fied device does not exist or has not been
- opened by this client via _X_O_p_e_n_I_n_p_u_t_D_e_v_i_c_e.
- 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
- _X_C_h_a_n_g_e_K_e_y_b_o_a_r_d_D_e_v_i_c_e or _X_C_h_a_n_g_e_P_o_i_n_t_e_r_D_e_v_i_c_e
- requests.
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- SSEEEE AALLSSOO
- _P_r_o_g_r_a_m_m_i_n_g _w_i_t_h _X_l_i_b
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- X Version 11 Release 6.1 2
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