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zigggo

Fileopen in read mode and file changes..

2 posts in this topic

#1 ·  Posted (edited)

If you open a file in read mode in autoit, if another program writes to this file will you be able to read the changes or do you have to close and reopen the file? Thanks.

Edit: in the alternative, what is the best way monitor a file for changes in a loop, and continue reading line by line from the last position.

edit2: I was wondering whether this would work:

1) FileReadLine in a loop until EOF

2) FileGetPos

3) Check if FileGetSize - 1 > FileGetPos

4) if true, FileSetPos to FileGetPos + 1

5) go to Step 1

Edited by zigggo

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#2 ·  Posted (edited)

You can read from a file that is open for write operation in another or the same program.

But to be 100% sure that you get accurate results I would close and open the file before any read operation.

If you work with handles the records are held in buffers and are written to the file when the buffer is filled or the file is closed.

So you could reach end-of-file and miss some of the changes already written to disk but you will always miss the in-flight changes.

Edited by water

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