File Locking

[dfound]

Hi, I am using Turbo C++ and is thinking of creating a program that would lock files. Since I am a newbie , I can't figure out how to lock the files. I am not talking about denying sharing , what I want is that when the file is being tried to open , it must show an error message or it should not open at all..

Hope that I will get replies :-)

[willakawill]

Hi, I am using Turbo C++ and is thinking of creating a program that would lock files. Since I am a newbie , I can't figure out how to lock the files. I am not talking about denying sharing , what I want is that when the file is being tried to open , it must show an error message or it should not open at all..

Hope that I will get replies :-)

Other than causing irritation to other users, what reason do you have for locking files? What type of file are you trying to lock?

[horace1]

Hi, I am using Turbo C++ and is thinking of creating a program that would lock files. Since I am a newbie , I can't figure out how to lock the files. I am not talking about denying sharing , what I want is that when the file is being tried to open , it must show an error message or it should not open at all..

Hope that I will get replies :-)

the simplest way would be to make the files read only

[dfound]

Well I am trying to lock some of my private documents. So , I cannot just make it a read-only. People shouldnot be able to open or see those files except for me. How can I do it?

[horace1]

Well I am trying to lock some of my private documents. So , I cannot just make it a read-only. People shouldnot be able to open or see those files except for me. How can I do it?

you need to change the access rights so that no one but the owner can access the files
.e.g the chmod command in unix
chmod 700 file.txt

there is a function _chmod() in the windows C library which appears to do a similar thing (I have never used it though)
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt__chmod.2c_._wchmod.asp

under windows there is also the cacls command line tool
http://www.ss64.com/nt/cacls.html