[R] handling a cancelled file.choose()

From: Ben Tupper <btupper_at_bigelow.org>
Date: Wed, 06 Jun 2007 11:51:19 -0400


Hello,

I have a file reading function that prompts the user with a file dialog if a filename is not provided in the argument list. It is desirable to return gracefully if the user selects "Cancel", but file.choose() throws an error instead of returning something like a character.

> file.choose()

[1] "/Users/ben/ben_idl.pref"

> file.choose()

Error in file.choose() : file choice cancelled

I naively planned to use nchar() to test the length, assuming cancellation would return a zero-length character. That appears to be out of the question. Are there other options available in the base package?

Thanks!
Ben



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