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Set File Position (G Dataflow)

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Last Modified: February 28, 2020

Moves the location of the next read or write operation within a file to a different position.

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refnum

File reference associated with the file whose file position you want to access.

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offset

Distance, in bytes, from the location specified by from to set the file position.

Default: 0

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from

Pre-defined location in the file to which you can move the file position. Use this location in combination with offset to specify an exact file position.

Name Description
start

Sets the file position offset bytes from the beginning of the file. If from is 0, wire a value greater than or equal to 0 to offset.

end

Sets the file position offset bytes from the end of the file. If from is 1, wire a value less than or equal to 0 to offset.

current

Sets the file position offset bytes from the current file position.

Default: start

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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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refnum out

The same reference as refnum.

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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.

Where This Node Can Run:

Desktop OS: Windows

FPGA: All devices (only within an optimized FPGA VI)

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

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