Lock an ini file

I want to lock an INI file, so that only my program can write to it.
How can I do this, and still be able to use the GetPrivateProfileString API functions?
MakeItWork614Asked:
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pjknibbsConnect With a Mentor Commented:
You can't. There isn't any way to lock a particular file so only a particular program can use it--the best you can do is make the file read-only, then use code to make the file writable before performing any updates to it.

If you're using an OS with the NTFS file system you can set permissions on a file so only certain USERS can access it, but even then someone with administrative rights on the machine could come in and change the file's owner.
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DanRollinsCommented:
You could encrypt the file.  Then before reading it, you could decrypt it, access its data, then encrypt it again.

Of course the user could still delete it or make meaningless (random) changes to it, but maybe just preventing the user from making 'intelligent' changes might accomplish your goal.

-- Dan
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griesshCommented:
Dear MakeItWork614

I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. You can always request to keep this question open. But remember, experts can only help you if you provide feedback to their questions.
Unless there is objection or further activity,  I will suggest to accept

     "pjknibbs"

comment(s) as an answer.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
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MakeItWork614Author Commented:
griessh,
I object.
I feel that just because pjknibbs doesn't know of a way to do this, doesn't mean there isn't a method capable of doing it.
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griesshCommented:
MakeItWork614

Thanks for your feedback. Maybe DanRollins (he also commented on this question) steps in here and tells us his opinion.
I have to fully agree with pjknibbs, there is no way to lock a file for a certain application. pjknibbs didn't say he doesn't know of a way, he said that there isn't any way to do it! Quite a difference.
BTW: as I said already, if the experts don't get any feedback, they won't come back with more comments ...

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Werner
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DanRollinsCommented:
There is one idea...
if your program is a service, or otherwise is always running, you could open the file, setting the sharing mode to
   CFile::shareDenyRead | CFile::shareDenyWrite
That would prevent any other programs from opening the file -- as long as your program is running.  As soon as your program quites, the O/S is likely to release all file locks that it held.

I know that is not a reasonable answer, but i mention it anyway because:

   There is no reasonable way to do what you want to do.

-- Dan
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MoondancerCommented:
Please update and finalize this.
Moondancer - EE Moderator
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MakeItWork614Author Commented:
Moondancer,
My question is not ready to be finalized.
When I have worked through a satisfactory answer, I will finalize this question.

DanRollins,
I will give your method a try, and get back to you.

griessh,
>>he said that there isn't any way to do it!
Just because some saids that it can't be done, doesn't mean that it can't be done.
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MoondancerCommented:
Thanks, makes total sense to me; sorry to rush you.  I just wanted to make sure you were aware of updates, since my Email notifs were delayed.
:) Moondancer - EE Moderator
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griesshCommented:
MakeItWork614

I don't know how many people you need to tell you: It can't be done!

I'm glad that Dan's suggestion gives you at least a hint how to do what you want to accomplish, but that changes the question a bit ...

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Werner
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MakeItWork614Author Commented:
Moondancer,
Could you please split the points between pjknibbs and DanRollins?
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MoondancerCommented:
MakeItWork614 ->  Absolutely, happy to do this.  Thank you, points have been split.

Points for DanRollins -> http://www.experts-exchange.com/jsp/qShow.jsp?qid=20294982

Moondancer - EE Moderator
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