Document 64KB line limit for FileReadLine()

[PsaltyDS]

Based on this support topic: FileReadLine problem read a very big line ​http://www.autoitscript.com/forum/index.php?showtopic=84354

FileReadLine() uses a 64K buffer that will return a longer single line as multiple 64K lines. For example, 96K line will be read out as a 64K line, then a 32K line.

Jon indicates this is not a bug, so documentation should be updated reflect the limitation.

Demo: {{{
Global $sFile = "test.txt", $hFile, $n
Global $sLine = "012345467890"
FileDelete($sFile)

; Create large line
Do

$sLine &= $sLine

Until Stringlen($sLine) > 2^{16
ConsoleWrite("Actual line length = " & StringLen($sLine) & @LF)}

; Open file
$hFile = FileOpen($sFile, 2) ; Overwrite
For $n = 1 To 10

; Write 10 lines

FileWriteLine($hFile,$sLine)

Next
FileClose($hFile)

; Test with FileReadLine()
$n = 1
While 1

$sLine = FileReadLine($sFile, $n)
If @error Then ExitLoop
ConsoleWrite("Line " & $n & " length = " & StringLen($sLine) & @LF)
$n += 1

WEnd}}}