Adding Text

[TheDcoder]

Hello, I found that its quite challenging to do this:

text.txt:

Hello, I am a text file :). I love line No. 1

I want to change it like this:

I am line No. 1 now :P

Hello, I am a text file :). I love line No. 1

How can I do this in AutoIt without storing it?

Here is a straight-forward version of my question:

How to insert text at the starting point of the document without storing it in a variable b/c my program processes very large text files? (minimum 1 GB)

Thanks in advance!

TD

[TheDcoder]

>_FileWriteToLine Stores the contents of the file in the memory.....

TD

Edited March 15, 2015 by TheDcoder

[water]

But this function does what you wanted to avoid. It reads the whole file into a single variable and then uses stringsplit to create an array with the same name.

Means: It will use a lot of membory.

I suggest to read the file line by line, insert a new line where needed and then delete the original file.

[TheDcoder]

@water Thanks you saved me

[water]

Use FileOpen, FileRead, FileWrite and FileClose for best performance. Reading the file line by line (using FileReadLine) might be too slow.

Use FileRead to read the file in chunks of e.g. 1MB.

[JohnOne]

 

$hFile = FileOpen("Product.txt", 1) ; Open file For write append

 

FileSetPos($hFile, 0, 0) ; Set pos to beginning

 

FileWriteLine($hFile, "New Line 1") ; Write line

 

FileClose($hFile) ; Close file

 

EDIT:

Does not work, sorry.

Edited March 15, 2015 by JohnOne

[water]

Doesn't work here - it simply overwrites the file.

[TheDcoder]

Doesn't work here - it simply overwrites the file.

Me too

[water]

Seems the only possible way to insert lines is to rewrite the file as I have described above.

[TheDcoder]

@water I would be sad if its true

[mpower]

Could also look at using sed (e.g. https://unix.stackexchange.com/questions/87772/add-lines-to-the-beginning-and-end-of-the-huge-file)

Might need to look into using Cygwin to achieve the effect under Windows:

https://stackoverflow.com/questions/127318/is-there-any-sed-like-utility-for-cmd-exe

[JohnOne]

Oops.

Apologies.

It worked in my head, and the test file I used, could not tell what had happened.

[water]

First thing I usually ask: Why do you need to insert lines in such a large file? What kind of file do you process (log files etc.)?

[TheDcoder]

First thing I usually ask: Why do you need to insert lines in such a large file? What kind of file do you process (log files etc.)?

Log files with 5 years of age

[JohnOne]

Crikey!

I think the script you should be writing is one to get that data into some sort of database, and use that.

[water]

A log file stores events and describes what has happend. By definition a log file shouldn't be changed.

If you need to insert records for reporting purposes then I suggest to use a report generator (e.g. Crystal Reports).

[TheDcoder]

@water I prefer to keep my purpose for editing log with autoit confidential, please understand

[JohnOne]

Your purpose is irrelevant, your method is what's in question.

[TheDcoder]

I am simply adding some extra details to the log files like username, check-sum and then encrypting it

Edited March 15, 2015 by TheDcoder

[JohnOne]

Simply eh!

A 1 GB text file is not big and not clever, you are finding out why.