how to protect files like this?

[szcococut]

I have a file (d://*.txt) require : 1.My app(exe) can read ,write ,delete ,update this file; 2.user(you or me) can't write ,update ,delete this file,but he can read this file. can you give me advise please? thanks

[khan]

Open the file in read-only mode, and keep it open. That way no one can write to, or delete the file. When you need to write to it, or update it or delete it, close the file handle, then do whatever you want with it. Have fun. this is this.

[toxcct]

won't work anymore when closing the application

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TOXCCT >>> GEII power
[toxcct][VisualCalc]

[khan]

Can use a service for that instead of a program. this is this.

[toxcct]

not a good method. there's no need to use memory and processor ressources... NTFS provides rights on the file system, which allow you to set who can and who cannot access the file/directory, and how wide is the authorization for one on that file...

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TOXCCT >>> GEII power
[toxcct][VisualCalc]

[khan]

I don't know if it is possible to set access rights for individual programs in NTFS ("not different users"). Like: one program can read modify/delete a file while another cannot? Maybe you can link to the right source. this is this.

[David Crow]

To expand on toxcct's suggestion. Deny all access to the file except for one user (a user that is not used by any person). Then in your program, impersonate that user before trying to update the file. See CreateProcessWithLogonW(). Make sense?

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