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Windows API: Prevent Computer Going To Sleep

How to prevent a Windows PC from going to sleep and then how to restore its ability to sleep again; written in C/C++.

Ever needed to prevent a Windows computer from going to sleep? Just a single line of code will do it, but use it wisely because many users do not like apps that prevent their PC from going to sleep.

#include <windows.h>

// This sets the appropriate flags to prevent the system going into sleep mode; this is useful if making a screen saver that processes data in the background and can't have the computer sleep

After an application no longer needs the computer to be awake, restore its ability to sleep with this line of code:

#include <windows.h>

// This allows the system to sleep normally

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