_LASTBUTTON - mkilgore/QB64pe GitHub Wiki

The _LASTBUTTON function returns the number of buttons a specified INPUT device on your computer has.

buttonCount% = __LASTBUTTON(deviceNumber)

• Returns the number of buttons that can be read on a specified device number within the number of _DEVICES found.
• A valid number can be sent to the _BUTTON or _BUTTONCHANGE function to find any button events.
• The specific device name and functions can be found by the _DEVICE$ function string.
• The devices are listed in a numerical order determined by the OS and can be read by the DEVICE$ function.
• The _DEVICES function must be read before using _LASTBUTTON or an "Illegal Function Call" error will occur.
• Devices include keyboard (reported as 1), mouse (reported as 2), joysticks, game pads and multiple stick game controllers.

Example: Checking for the system's input devices.

 '' ''
devices = _DEVICES  'MUST be read in order for other 2 device functions to work!
PRINT "Number of input devices found ="; devices
FOR i = 1 TO devices
  PRINT _DEVICE$(i)
  PRINT "Buttons:"; _LASTBUTTON(i)
NEXT '' ''

Number of input devices found = 2
[KEYBOARD][BUTTON]
Buttons: 512
[MOUSE][BUTTON][AXIS][WHEEL]
Buttons: 3

Note: The STRIG/STICK commands won't read from the keyboard or mouse device the above example lists.

• _LASTAXIS, _LASTWHEEL
• _AXIS, _BUTTON, _WHEEL
• _DEVICES, _DEVICE$
• _DEVICEINPUT
• _MOUSEBUTTON
• STRIG, STICK
• ON STRIG(n), STRIG(n)