Writing out null bytes

[Tsukihime]

Here is a simple text file called "test.txt" which contains just "abcde"

61 62 63 64 65

When I say

$file = FileOpen("test.txt", 17)
filesetpos($file, 0, 0)
FileWrite($file, 0x0)
FileClose($file)

I get

00 00 00 00 65

How do I get it to only write a single null byte so that I get

00 62 63 64 65

Edited May 11, 2011 by Tsukihime

[iamtheky]

$file = FileOpen("test.txt", 1)
filesetpos($file, 0, 0)
FileWrite($file, 0)
filesetpos($file, 0, 1)
FileWrite($file, 0)
FileClose($file)

run ("notepad.exe " & @ScriptDir & "\test.txt")

[Tsukihime]

Found a solution:

$file = FileOpen("test.txt", 17)
filesetpos($file, 0, 0)
FileWrite($file, chr(0))
FileClose($file)

Don't know why that did it but it works lol

[jchd]

FileWrite($file, 0x0) does what you ask it to do: write a 32-bit integer with value 0, hence the four 0x00 at top of your dumped file.