Lock Mac Desktop screen

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hi there,
i am new to objective-c, and i want to write a cocoa application to lock a desktop screen and wait for user to enter password , and if password is correct then unlock screen.
please any one tell me how to do it using objective-c(Xcode).
 
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You do know that's built into the system right? Set to require password after screensaver...set up hot corner to start screensaver.
 

bobtomay

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Your Mac's Specs
15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
Sounds like a homework assignment.
 

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