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74 lines
3.2 KiB
Markdown
74 lines
3.2 KiB
Markdown
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The **_DEVICE$** function returns a [STRING](STRING) value holding the controller type, name and input types of the input devices on a computer.
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## Syntax
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> device$ = _DEVICE$(device_number)
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* The **[_DEVICES](_DEVICES) function must be read first to get the number of devices and to enable [_DEVICE$](_DEVICE$) and [_DEVICEINPUT](_DEVICEINPUT).**
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* The device_number parameter indicates the number of the controller device to be read.
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* Returns the [STRING](STRING) control type, name of the device and input types each can use included in brackets:
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* Control type:
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* [KEYBOARD] always listed as first device when keyboard(s) available. Only one keyboard will show.
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* [MOUSE]] always listed as second device when keyboard(s) and mouse(mice) are available. Only one mouse will show.
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* [CONTROLLER] subsequent devices are listed as controllers which include joysticks and game pads.
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* When [CONTROLLER] is returned it may also give the [STRING](STRING) [NAME] [device description](NAME] [device description) of the controller.
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* Returns the type of input after the device name as one or more of the following types:
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* [[BUTTON](BUTTON)] indicates there are button types of input. [_LASTBUTTON](_LASTBUTTON) can return the number of buttons available.
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* [[AXIS](AXIS)] indicates there are stick types of input. [_LASTAXIS](_LASTAXIS) can return the number of axis available.
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* [[WHEEL](WHEEL)] indicates that a scrolling input can be read. [_LASTWHEEL](_LASTWHEEL) can return the number of wheels available.
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* **Device numbers above the number of [_DEVICES](_DEVICES) found will return an OS error.**
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* Devices found include keyboard, mouse, joysticks, game pads and multiple stick game controllers.
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## Example(s)
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Checking for the system's input devices and the number of buttons available.
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```vb
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devices = _DEVICES 'MUST be read in order for other 2 device functions to work!
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PRINT "Number of input devices found ="; devices
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FOR i = 1 TO devices
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PRINT _DEVICE$(i)
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PRINT "Buttons:"; _LASTBUTTON(i); "Axis:"; _LASTAXIS(i); "Wheels:"; _LASTWHEEL(i)
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NEXT
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```
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```text
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Number of input devices found = 3
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[KEYBOARD][BUTTON]
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Buttons: 512 Axis: 0 Wheels: 0
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[MOUSE][BUTTON][AXIS][WHEEL]
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Buttons: 3 Axis: 2 Wheels: 3
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[CONTROLLER][NAME][Microsoft Sidewinder Precision Pro (USB)](NAME][Microsoft Sidewinder Precision Pro (USB))[BUTTON][AXIS]
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Buttons: 9 Axis: 6 Wheels: 0
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```
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> Note: The [STRIG](STRIG)/[STICK](STICK) commands won't read from the keyboard or mouse device the above example lists. They will only work on controllers.
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Finding the number of mouse buttons available in QB64. This could also be used for other devices.
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```vb
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FOR d = 1 TO _DEVICES 'number of input devices found
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dev$ = _DEVICE$(d)
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IF INSTR(dev$, "[MOUSE]") THEN buttons = _LASTBUTTON(d): EXIT FOR
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NEXT
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PRINT buttons; "mouse buttons available"
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```
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## See Also
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* [_DEVICES](_DEVICES), [_DEVICEINPUT](_DEVICEINPUT)
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* [_LASTBUTTON](_LASTBUTTON), [_LASTAXIS](_LASTAXIS), [_LASTWHEEL](_LASTWHEEL)
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* [_BUTTON](_BUTTON), [_BUTTONCHANGE](_BUTTONCHANGE)
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* [_AXIS](_AXIS), [_WHEEL](_WHEEL)
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* [_MOUSEBUTTON](_MOUSEBUTTON)
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* [STRIG](STRIG), [STICK](STICK)
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* [ON STRIG(n)](ON-STRIG(n)), [STRIG(n)](STRIG(n))
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* [Controller Devices](Controller-Devices)
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