create c++ application with openssl lib (aes) to lock/unlock a "txt file"

hi, is there any example on this available?  I interested in locking up a "txt" file using aes.  so each time the application is executed, user will be prompted for password . This pasword will be used to unlock the txt file.
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what's the platform ??

e.g., if in windows , the following is a basic framewok of how the code would look like

(1) program starts, uses the api CreateFile to open the text file in READ mode, with the share setting to exclusive (so no one else can access it)
(2) prompts user for password
(3) if password is correct, then call CloseHandle to release the file lock, so that user can access it
(4) wait till user tells prog. to re-lock the file, at that point, go back to step(1)

u can place the program in the startup folder, so that the file gets locked at startup.


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