Erase bit in file

[Ptifou78]

Hello everybody I would like to know how to erase *n bits into a file previously open with de the binary mod

I have an idea is to read all bit what i need and rewrite a new file but is very slow :/

Thanks in advance

[water]

If you know the position of the data in the file you can use function FileSetPos to overwrite the data. The following example writes an "x" at position 10 of a text file.

$hFile = FileOpen("C:\temp\test.txt", 1)
$iPos = FileSetPos($hFile, 10, 0)
FileWrite($hFile, "x")
FileClose($hFile)

You need to change the script to replace binary data.

[water]

My example overwrites data but if you really need to erase (remove) the data (so the file gets shorter) then there is no other way then rewriting the file as you already do.

[Ptifou78]

Shit and i can not do a string replace like? ^^'

[water]

How big is the file you need to process?

What have you coded so far?

[Ptifou78]

I have multiple file to process from 1/2mb to 40mb... :/

$F_output = @ScriptDir&"test_output.txt"
$F_input =  @ScriptDir&"test.txt"
FileOpen($F_output,17)
FileOpen($F_input,17)
Filewrite($F_output,'header')
FileSetPos($F_input,128,0);lenght of header
$nb_ligne = Hex_to_int32(FileRead($F_input,4))
For $i to $nb_ligne
    $1st_part = FileRead($F_input,xxx bit)
    FileSetPos($F_input,4,1);bits to skip
    $2nd_part = FileRead($F_input,xxx bit)
    FileWrite($F_output,$1st_part&$2nd_part)
Next
MsgBox(0,"","Finnish")

[water]

To enhance performance you could read the file in one go using FileRead without setting the number of characters to read.

Then use StringReplace($StringContainingTheFile, $StringToReplace, "") and then write the file in one go using FileWrite.

That should enhance performance considerable.

One question. What kind of files do you want to remove binary content? Pictures ...?

[Ptifou78]

I can't because the string is not always the same

It's a rdb file for a game it contain some information about data i jjust want to extract them but for that i need to change a litlle bit his structur

Moreover i have a stupid question if i do that

$data_original = fileread($myfile)
Filewrite($my_outputfile,$daata_original

If the data original is a binary content i need to translate it for rewrite it or is good?

[water]

Would you be so kind to tell us the name of the game?

[Ptifou78]

Rappelz a MMoRPG is not a crack i just want it for have model data to use in my art work >.<

Edited May 19, 2012 by Ptifou78

[Valik]

This thread was perfectly fine right up until you mentioned that you were violating our forum rules. Thread locked. I suggest reading the rules before you post again.