IB53
4th November 2009 06:19 UTC

Folder Creation
I just installed NSIS and I'm trying to come to grips with things, I've read a lot of the documentation but there are still many things which are confusing me.
So my first question is regarding creating a folder. If I create a folder under (say) Userdata, and it already exists (for example the user runs the install twice or they have a folder of that name already), what happens? Does the install error out, does the user get a question or what?
What's the best way to prevent this happening, for example, should I be somehow testing for it's existence and taking appropriate action?
Any examples would be more than welcome! :)

many thanks,, and,, "Hello!" nice to meet you all.

Ian

MSG
4th November 2009 07:49 UTC

Re: Folder Creation

If I create a folder under (say) Userdata, and it already exists (for example the user runs the install twice or they have a folder of that name already), what happens? Does the install error out, does the user get a question or what?

IB53
5th November 2009 03:42 UTC

Thank you for your reply.

To answer your question - because no matter what the answer to "what happens if" I would not have known what to do about it so i would still have had to post a question to answer that.

Even after having looked again at the page you reference I'm still unsure of the answer, as I said, I have read the documentation.

CG!
5th November 2009 04:06 UTC

i'm new to NSiS too and that's what i figured out from learning by doing:
if your install trys to create a folder that already exists, nothing happens. No error message, nothing. So if you install into a sensitive folder, check if it already exists first or use user confirmations when a file as to be replaced.
if you try to delete a folder that has still files in it, nothing will be deleted and no error comes up.
if you got a folder tree like this:
Root
-- Files
-- Subfolder #1
---- Subfolder #2
------ Files
then you'll gave to create Subfolder #1 first. i know, that's basic knowledge but easy to forget because NSiS does not create Subfolder in not existing folder. With other words: nothing will be done and no error comes up. Same count's for deleting folder. You can't just RMDir the root if there are still files or subfolders in it.
DOS style i say ... a least it what it looks like to me. ^^

Hope i could help a bit or more.

MSG
5th November 2009 08:04 UTC

Originally posted by CG!
NSiS does not create Subfolder in not existing folder.

CG!
5th November 2009 09:54 UTC

Creating subfolders in not axisting folders doesn't work for me and it's what i discovered by doing instead of reading.
i'm still new to NSiS, so there's alot to learn left.

Originally posted by MSG

ClearErrors
CreateDirectory "C:\YourPath\YourExistingSubDir"
${If} ${Errors}
  MessageBox MB_OK "Error!"
${Else}
  MessageBox MB_OK "No error."
${EndIf}