Reading a certain offset of the file & writing to it

[GreYFoX]

Reading a certain offset of the file & writing to it

the file i'm talking about is 200mb+

so i need to read a certain offset to offset of the file

and write to it again

thanks

[martin]

Reading a certain offset of the file & writing to it

the file i'm talking about is 200mb+

so i need to read a certain offset to offset of the file

and write to it again

thanks

Here are two suggestions, but I would wait to see if anyone gives a better answer before putting any time into it because I don't know if this is the best way. Certainly I have often wondered about this, and the documentation for the File functions makes it look difficult. There doesn't appear to be a way in AutIt to write to a file at an offset from the beginning or end and then overwrite.

So this is what I would try.

$hFRead = FileOpen("???",16);Open the file in binary and read mode.
$hFWrite = FileOpen("temp",16 + 1);Open a file to write to in binary and write mode.

$start = Fileread($hf,$offset);read up to the offset you want
FileWrite($hfWRite,$offset);copy this part to temp file

$StringToWRite = "something";what you want to write at this point
FileRead($hfRead,Stringlen($StringToWrite);get past that length in file we are reading
FileWrite($hFWRite,StringToBinary($StringToWrite))

;from here just read chunks of data, say 1Mb at a time, from the file and write them to the temp file untill eof

Or

You could read the whole file using

$Text = FileRead($FileName)

Then say

$Text = StringReplace(StringMid($text,offset,StringLen($text_to_overwrite),$text_to_overwrite)

FileWrite("NewFileName",$Text)

Edited December 2, 2007 by martin

[randallc]

Hi,

Use "TailRW" in my signature.

There are examples of setting "position" in binary to start writing, and whether to insert or replace in the zip in my sig. [then don't need the slow file read of a big file..]

Let me know..

best, randall