_LASTWHEEL - mkilgore/QB64pe GitHub Wiki

The _LASTWHEEL function returns the number of wheels a specified number INPUT device on your computer has.

wheelCount% = _LASTWHEEL(deviceNumber)

• Returns the number of wheels that can be used on a specified device number within the number of _DEVICES found.
• A valid number can be sent to the _WHEEL function to find any relative positive or negative wheel movements.
• 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 _LASTWHEEL or an "Illegal Function Call" error may 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 and number of wheels available.

 '' ''
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$(i)
  IF INSTR(_DEVICE$(i), "[WHEEL]") THEN PRINT "Wheels:"; _LASTWHEEL(i)
NEXT '' ''

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

Note: A mouse may have 3 wheels listed when there is only one scroll wheel.

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