Asynchronous key status functions

Functions
MG_EXPORT BOOL GUIAPI	GetKeyStatus (UINT uKey)
	Get a key or a mouse button status. More...
MG_EXPORT DWORD GUIAPI	GetShiftKeyStatus (void)
	Get status of the shift keys. More...
MG_EXPORT void GUIAPI	GetKeyboardState (BYTE *kbd_state)
	Get status of all keys on keyboard. More...

Detailed Description

Function Documentation

GetKeyboardState()

void GUIAPI GetKeyboardState

(

BYTE *

kbd_state

)

Get status of all keys on keyboard.

This function gets the status of all keys on keyboard.

The scancodes of all keys are defined in <minigui/common.h>.

Parameters

kbd_state

The buffer returns the current status of all keys. Note that the length of the buffer should be larger than (MGUI_NR_KEYS + 1).

See also

GetKeyStatus, MGUI_NR_KEYS

GetKeyStatus()

BOOL GUIAPI GetKeyStatus

(

UINT

uKey

)

Get a key or a mouse button status.

This function gets a key or a mouse button status, returns TRUE when pressed, or FALSE when released. uKey indicates the key or mouse button. For keys on keyboard, uKey should be the scancode of the key, for mouse button, uKey should be one value of the following:

• SCANCODE_LEFTBUTTON
  Left mouse button.
• SCANCODE_MIDDLBUTTON
  Middle mouse button.
• SCANCODE_RIGHTBUTTON
  Right mouse button.

These constants and the scancodes of keys are defined in <minigui/common.h>.

Parameters

uKey	Indicates the key or mouse button.

Returns

Returns TRUE when pressed, or FALSE when released.

See also

GetShiftKeyStatus

GetShiftKeyStatus()

DWORD GUIAPI GetShiftKeyStatus

(

void

)

Get status of the shift keys.

This function gets ths status of the shift keys, the returned value indicates the status of shift keys – CapsLock, ScrollLock, NumLock, Left Shift, Right Shift, Left Ctrl, Right Ctrl, Left Alt, and Right Alt. You can use KS_* ORed with the status value to determine one shift key's status:

• KS_CAPSLOCK
  Indicates that CapsLock is locked.
• KS_NUMLOCK
  Indicates that NumLock is locked.
• KS_SCROLLLOCK
  Indicates that ScrollLock is locked.
• KS_LEFTCTRL
  Indicates that left Ctrl key is pressed.
• KS_RIGHTCTRL
  Indicates that right Ctrl key is pressed.
• KS_CTRL
  Indicates that either left or right Ctrl key is pressed.
• KS_LEFTALT
  Indicates that left Alt key is pressed.
• KS_RIGHTALT
  Indicates that right Alt key is pressed.
• KS_ALT
  Indicates that either left or right Alt key is pressed.
• KS_LEFTSHIFT
  Indicates that left Shift key is pressed.
• KS_RIGHTSHIFT
  Indicates that right Shift key is pressed.
• KS_SHIFT
  Indicates that either left or right Shift key is pressed.

These constants are defined in <minigui/common.h>.

Returns

The status of the shift keys.

See also

Macros for key codes and shift status