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Query Input Devices (G Dataflow)

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Last Modified: June 25, 2019

Obtains information about the devices connected to the computer.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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joystick info

An array of information about the joysticks connected to the computer.

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axes total

Total number of axes for each joystick connected to the computer.

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buttons total

Total number of buttons for each joystick connected to the computer.

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pov total

Total number of points of view for each joystick connected to the computer.

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device name

Device name of each joystick connected to the computer.

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keyboard info

An array of information about the keyboards connected to the computer.

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buttons total

Number of keys on the keyboard connected to the computer.

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device name

Device name of the keyboard connected to the computer.

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mouse info

An array of information about the mouse connected to the computer.

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axes total

Total number of axes for the mouse connected to the computer.

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buttons total

Total number of buttons for the mouse connected to the computer.

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device name

Device name of the mouse connected to the computer.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Behavior with Multiple Devices of the Same Type

If you connect more than one mouse or keyboard to your computer, this node recognizes only the first mouse or keyboard.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application

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