Redspark at 02:14, 30 January 2025

2025-01-30T02:14:10Z

JoeStrout: Created page with "The atEnd method of the FileHandle class returns true after attempting to read past the end of the file. Note that atEnd is not true after the last successf..."

2021-01-09T18:27:37Z

Created page with "The <c>atEnd</c> method of the FileHandle class returns true after attempting to read past the end of the file. Note that <c>atEnd</c> is not true after the last successf..."

New page

The <c>atEnd</c> method of the [[FileHandle]] class returns true after attempting to read past the end of the file.

Note that <c>atEnd</c> is not true after the last successful read, nor is it true at the beginning of an empty file. It only reports the condition that the last attempted read failed because there was no more data. This is explained (in reference to the standard C function <c>feof</c>) [https://stackoverflow.com/questions/34888776 here].

For this reason, instead of using <c>atEnd</c> in most cases, you should simply check for the [[FileHandle.read|read]] or [[FileHandle.readLine|readLine]] method to return [[null]], like so:

<ms>reader = file.open("fileToRead.txt", "r")
writer = file.open("fileToWrite.txt", "w")

// Copy the lines from one to the other, while changing to upper case.
while true
line = reader.readLine
if line == null then break
writer.writeLine line.upper
end while</ms>

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FileHandle.atEnd - Revision history

Redspark at 02:14, 30 January 2025

JoeStrout: Created page with "The atEnd method of the FileHandle class returns true after attempting to read past the end of the file. Note that atEnd is not true after the last successf..."