LASTWHEEL: Difference between revisions

From QB64 Phoenix Edition Wiki
Jump to navigation Jump to search
No edit summary
No edit summary
 
Line 8: Line 8:


* Returns the number of wheels that can be used on a specified device number within the number of [[_DEVICES]] found.
* 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.  
* 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$]] function.
* The devices are listed in a numerical order determined by the OS and can be read by the [[_DEVICE$]] function.
* '''The [[_DEVICES]] function must be read before using _LASTWHEEL or an [[ERROR Codes|"Illegal Function Call" error]] may occur.'''
* '''The [[_DEVICES]] function must be read before using _LASTWHEEL or an [[ERROR Codes|"Illegal Function Call" error]] may occur.'''
Line 22: Line 22:
   PRINT {{Cl|_DEVICE$}}(i)
   PRINT {{Cl|_DEVICE$}}(i)
   IF {{Cl|INSTR}}({{Cl|_DEVICE$}}(i), "[WHEEL]") THEN PRINT "Wheels:"; {{Cl|_LASTWHEEL}}(i)
   IF {{Cl|INSTR}}({{Cl|_DEVICE$}}(i), "[WHEEL]") THEN PRINT "Wheels:"; {{Cl|_LASTWHEEL}}(i)
NEXT  
NEXT
{{CodeEnd}}
{{CodeEnd}}
{{OutputStart}}Number of input devices found = 2
{{OutputStart}}Number of input devices found = 2

Latest revision as of 01:55, 23 January 2023

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


Syntax

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.


Examples

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.


See also



Navigation:
Main Page with Articles and Tutorials
Keyword Reference - Alphabetical
Keyword Reference - By usage