DEVICE$: Difference between revisions

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{{DISPLAYTITLE:_DEVICE$}}
The '''_DEVICE$''' function returns a [[STRING]] value holding the controller type, name and input types of the input devices on a computer.
The '''_DEVICE$''' function returns a [[STRING]] value holding the controller type, name and input types of the input devices on a computer.


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::: [CONTROLLER] subsequent devices are listed as controllers which include joysticks and game pads.
::: [CONTROLLER] subsequent devices are listed as controllers which include joysticks and game pads.
::* When [CONTROLLER] is returned it may also give the [[STRING]] [[NAME] [device description]] of the controller.
::* When [CONTROLLER] is returned it may also give the [[STRING]] [[NAME] [device description]] of the controller.
::* When [DISCONNECTED] is returned, then the device was unplugged after device init.
::* Returns the type of input after the device name as one or more of the following types:
::* Returns the type of input after the device name as one or more of the following types:
::: [{{KW|BUTTON}}] indicates there are button types of input. [[_LASTBUTTON]] can return the number of buttons available.  
::: [[[BUTTON]]] indicates there are button types of input. [[_LASTBUTTON]] can return the number of buttons available.
::: [{{KW|AXIS}}] indicates there are stick types of input. [[_LASTAXIS]] can return the number of axis available.  
::: [[[AXIS]]] indicates there are stick types of input. [[_LASTAXIS]] can return the number of axis available.
::: [{{KW|WHEEL}}] indicates that a scrolling input can be read. [[_LASTWHEEL]] can return the number of wheels available.
::: [[[WHEEL]]] indicates that a scrolling input can be read. [[_LASTWHEEL]] can return the number of wheels available.


* '''Device numbers above the number of [[_DEVICES|devices]] found will return an OS error.'''
* '''Device numbers above the number of [[_DEVICES|devices]] found will return an OS error.'''
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{{PageExamples}}
{{PageExamples}}
''Example 1:'' Checking for the system's input devices and the number of buttons available.
''Example 1:'' Checking for the system's input devices and the number of buttons available.
{{CodeStart}} '' ''
{{CodeStart}}
devices = {{Cl|_DEVICES}} 'MUST be read in order for other 2 device functions to work!
devices = {{Cl|_DEVICES}} {{Text|<nowiki>'MUST be read in order for other 2 device functions to work!</nowiki>|#919191}}
PRINT "Number of input devices found ="; devices
{{Cl|PRINT}} {{Text|<nowiki>"Number of input devices found ="</nowiki>|#FFB100}}; devices
FOR i = 1 TO devices
{{Cl|FOR}} i = {{Text|1|#F580B1}} {{Cl|TO}} devices
  PRINT {{Cl|_DEVICE$}}(i)
    {{Cl|PRINT}} {{Cl|_DEVICE$}}(i)
  PRINT "Buttons:"; {{Cl|_LASTBUTTON}}(i); "Axis:"; {{Cl|_LASTAXIS}}(i); "Wheels:"; {{Cl|_LASTWHEEL}}(i)
    {{Cl|PRINT}} {{Text|<nowiki>"Buttons:"</nowiki>|#FFB100}}; {{Cl|_LASTBUTTON}}(i); {{Text|<nowiki>"Axis:"</nowiki>|#FFB100}}; {{Cl|_LASTAXIS}}(i); {{Text|<nowiki>"Wheels:"</nowiki>|#FFB100}}; {{Cl|_LASTWHEEL}}(i)
NEXT '' ''
{{Cl|NEXT}}
{{CodeEnd}}
{{CodeEnd}}
{{OutputStart}}Number of input devices found = 3
{{OutputStart}}Number of input devices found = 3
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:Note: The [[STRIG]]/[[STICK]] commands won't read from the keyboard or mouse device the above example lists. They will only work on controllers.
:Note: The [[STRIG]]/[[STICK]] commands won't read from the keyboard or mouse device the above example lists. They will only work on controllers.


----


''Example 2:'' Finding the number of mouse buttons available in QB64. This could also be used for other devices.
''Example 2:'' Finding the number of mouse buttons available in QB64. This could also be used for other devices.
{{CodeStart}} '' ''
{{CodeStart}}
{{Cl|FOR...NEXT|FOR}} d = 1 {{Cl|TO}} {{Cl|_DEVICES}} 'number of input devices found
{{Cl|FOR}} d = {{Text|1|#F580B1}} {{Cl|TO}} {{Cl|_DEVICES}} {{Text|<nowiki>'number of input devices found</nowiki>|#919191}}
  dev$ = {{Cl|_DEVICE$}}(d)
    dev$ = {{Cl|_DEVICE$}}(d)
  {{Cl|IF...THEN|IF}} {{Cl|INSTR}}(dev$, "[MOUSE]") {{Cl|THEN}} buttons = {{Cl|_LASTBUTTON}}(d): {{Cl|EXIT}} {{Cl|FOR...NEXT|FOR}}
    {{Cl|IF}} {{Cl|INSTR}}(dev$, {{Text|<nowiki>"[MOUSE]"</nowiki>|#FFB100}}) {{Cl|THEN}} buttons = {{Cl|_LASTBUTTON}}(d): {{Cl|EXIT FOR}}
{{Cl|NEXT}}
{{Cl|NEXT}}
{{Cl|PRINT}} buttons; "mouse buttons available" '' ''
{{Cl|PRINT}} buttons; {{Text|<nowiki>"mouse buttons available"</nowiki>|#FFB100}}
{{CodeEnd}}
{{CodeEnd}}


Latest revision as of 21:29, 22 May 2023

The _DEVICE$ function returns a STRING value holding the controller type, name and input types of the input devices on a computer.


Syntax

device$ = _DEVICE$(device_number)


  • The _DEVICES function must be read first to get the number of devices and to enable _DEVICE$ and _DEVICEINPUT.
  • The device_number parameter indicates the number of the controller device to be read.
  • Returns the STRING control type, name of the device and input types each can use included in brackets:
  • Control type:
[KEYBOARD] always listed as first device when keyboard(s) available. Only one keyboard will show.
[MOUSE]] always listed as second device when keyboard(s) and mouse(mice) are available. Only one mouse will show.
[CONTROLLER] subsequent devices are listed as controllers which include joysticks and game pads.
  • When [CONTROLLER] is returned it may also give the STRING [[NAME] [device description]] of the controller.
  • When [DISCONNECTED] is returned, then the device was unplugged after device init.
  • Returns the type of input after the device name as one or more of the following types:
[[[BUTTON]]] indicates there are button types of input. _LASTBUTTON can return the number of buttons available.
[[[AXIS]]] indicates there are stick types of input. _LASTAXIS can return the number of axis available.
[[[WHEEL]]] indicates that a scrolling input can be read. _LASTWHEEL can return the number of wheels available.
  • Device numbers above the number of devices found will return an OS error.
  • Devices found include keyboard, mouse, joysticks, game pads and multiple stick game controllers.


Examples

Example 1: Checking for the system's input devices and the number of buttons 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)
    PRINT "Buttons:"; _LASTBUTTON(i); "Axis:"; _LASTAXIS(i); "Wheels:"; _LASTWHEEL(i)
NEXT

Number of input devices found = 3
[KEYBOARD][BUTTON]
Buttons: 512 Axis: 0 Wheels: 0
[MOUSE][BUTTON][AXIS][WHEEL]
Buttons: 3 Axis: 2 Wheels: 3
[CONTROLLER][[NAME][Microsoft Sidewinder Precision Pro (USB)]][BUTTON][AXIS]
Buttons: 9 Axis: 6 Wheels: 0
Note: The STRIG/STICK commands won't read from the keyboard or mouse device the above example lists. They will only work on controllers.

Example 2: Finding the number of mouse buttons available in QB64. This could also be used for other devices. 

FOR d = 1 TO _DEVICES 'number of input devices found
    dev$ = _DEVICE$(d)
    IF INSTR(dev$, "[MOUSE]") THEN buttons = _LASTBUTTON(d): EXIT FOR
NEXT
PRINT buttons; "mouse buttons available"


See also


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