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70 lines
3.2 KiB
Plaintext
70 lines
3.2 KiB
Plaintext
{{DISPLAYTITLE:_DEVICE$}}
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The '''_DEVICE$''' function returns a [[STRING]] value holding the controller type, name and input types of the input devices on a computer.
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{{PageSyntax}}
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: {{Parameter|device$}} = _DEVICE$({{Parameter|device_number}})
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* The '''[[_DEVICES]] function must be read first to get the number of devices and to enable [[_DEVICE$]] and [[_DEVICEINPUT]].'''
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* The {{Parameter|device_number}} parameter indicates the number of the controller device to be read.
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* Returns the [[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]] [[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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::: [{{KW|BUTTON}}] indicates there are button types of input. [[_LASTBUTTON]] can return the number of buttons available.
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::: [{{KW|AXIS}}] indicates there are stick types of input. [[_LASTAXIS]] can return the number of axis available.
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::: [{{KW|WHEEL}}] indicates that a scrolling input can be read. [[_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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{{PageExamples}}
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''Example 1:'' Checking for the system's input devices and the number of buttons available.
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{{CodeStart}} '' ''
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devices = {{Cl|_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 {{Cl|_DEVICE$}}(i)
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PRINT "Buttons:"; {{Cl|_LASTBUTTON}}(i); "Axis:"; {{Cl|_LASTAXIS}}(i); "Wheels:"; {{Cl|_LASTWHEEL}}(i)
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NEXT '' ''
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{{CodeEnd}}
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{{OutputStart}}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)]][BUTTON][AXIS]
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Buttons: 9 Axis: 6 Wheels: 0
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{{OutputEnd}}
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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.
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''Example 2:'' Finding the number of mouse buttons available in QB64. This could also be used for other devices.
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{{CodeStart}} '' ''
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{{Cl|FOR...NEXT|FOR}} d = 1 {{Cl|TO}} {{Cl|_DEVICES}} 'number of input devices found
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dev$ = {{Cl|_DEVICE$}}(d)
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{{Cl|IF...THEN|IF}} {{Cl|INSTR}}(dev$, "[MOUSE]") {{Cl|THEN}} buttons = {{Cl|_LASTBUTTON}}(d): {{Cl|EXIT}} {{Cl|FOR...NEXT|FOR}}
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{{Cl|NEXT}}
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{{Cl|PRINT}} buttons; "mouse buttons available" '' ''
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{{CodeEnd}}
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{{PageSeeAlso}}
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* [[_DEVICES]], [[_DEVICEINPUT]]
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* [[_LASTBUTTON]], [[_LASTAXIS]], [[_LASTWHEEL]]
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* [[_BUTTON]], [[_BUTTONCHANGE]]
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* [[_AXIS]], [[_WHEEL]]
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* [[_MOUSEBUTTON]]
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* [[STRIG]], [[STICK]]
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* [[ON STRIG(n)]], [[STRIG(n)]]
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* [[Controller Devices]]
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{{PageNavigation}}
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