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CRC32 or Byte by Byte?

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This is a pretty good method. Be aware that getting a md5 checksum can take quite long if you're using big files (> 100 MB).

If you just want to check if a file has been modified, you can use FileGetTime.

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Given that AutoIt has a FileSetTime function I would not recommend the file modification date as a sensible check on whether file modification has occurred. ;)


Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind

Open spoiler to see my UDFs:


ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area


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this is a pretty paranoid way of thinking (not in a bad way) and also of course correct.

I just assumed he was the only one using AutoIt on his file(s), so if he had used FileSetTime, he would probably know.

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Hashes are great to determine if the files are unique distinct or identical, byte by byte is best for actual comparision. Depends on what you are really trying to accomplish.  Dealing with large files there's going to be an increase in processing no matter what method you use.

Edited by spudw2k

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