Replace text in large text file

[theniteowl]

Hi All.
I know I have done this in the past but it has been a while.

I need to replace every occurance of a folder path inside a text file with an alternate path. The text files can run just over 16 meg in size. I know there are methods that are more efficient when working with large files but do not remember what they are.

Anyone have code for doing this before I go reinvent it?
I know it's basically open file, open output file, read input/replace text, write to output file and handle renaming/deleting the files when done. I just want to make it as efficient as is reasonable.

Thanks.

At my age I still learn something new every day, but I forget two others.

 

[Frink]

Hallo,

Can you open it as a TextStream and use ReadAll to load it into a string, then do your replace stuff and write it back in one go?

- Frink

 

[theniteowl]

I suspect so but the files go up to 16 meg in size and I did not know how well TextStream and ReadAll would work with that large amount of data.

It seems I remember there being a method similar to this but where you can state a number of lines to read in at one time with the benefit of increased performance and able to handle larger files.
I may be remembering this from some other scripting language though.

At my age I still learn something new every day, but I forget two others.

 

[strongm]

TextStream is fine wiht 16Mb