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I have a piece of server-ish software written in Java to run on Windows and OS X. (It is not running on a server, but just a normal user's PC - something like a torrent client.) I would like the software to signal to the OS to keep the machine awake (prevent it from going into sleep mode) while it is active.

Of course I don't expect there to be a cross platform solution, but I would love to have some very minimal C programs/scripts that my app can spawn to inform the OS to stay awake.

Any ideas?

I use this code to keep my workstation from locking. It's currently only set to move the mouse once every minute, you could easily adjust it though.

It's a hack, not an elegant solution.

import java.awt.*;
import java.util.*;
public class Hal{

    public static void main(String[] args) throws Exception{
        Robot hal = new Robot();
        Random random = new Random();
        while(true){
            hal.delay(1000 * 60);
            int x = random.nextInt() % 640;
            int y = random.nextInt() % 480;
            hal.mouseMove(x,y);
        }
    }
}

How to Keep Your Computer Awake Without Moving the Mouse, We bring you some easy ways to keep your computer awake. takes, it can be very useful for server machines that you always want online. Request: keeping computer awake without changing settings. It used to be that you could keep your computer awake by leaving the mouse cursor on the clock in the taskbar. The changing time would keep the computer awake.

On Windows, use the SystemParametersInfo function. It's a Swiss army-style function that lets you get/set all sorts of system settings.

To disable the screen shutting off, for instance:

SystemParametersInfo( SPI_SETPOWEROFFACTIVE, 0, NULL, 0 );

Just be sure to set it back when you're done...

How to keep your computer awake without touching the mouse, Every 59 seconds, it simulates the press of the F15 key to keep your machine out of screensaver/standby mode. F15? It's a key recognized by  While the machine does all the work, you can wipe the outside of it using a soft cloth soaked in a vinegar and hot water mixture. After thoroughly cleaning the entire machine from the outside,

I have a very brute-force technique of moving the mouse 1 point in the x direction and then back every 3 minutes.

There may me a more elegant solution but it's a quick fix.

How to keep your Android phone's screen on longer, and Security > Power Options and then click on Change plan settings, next to your default power plan. Alternatively, you can just type change power-saving settings in the Search tab in the start menu and click on the option that shows up. “Using dryer balls will also help to keep the sheets moving and prevent them from tangling around one another,” she added. And, as Richardson notes, pull them out as soon as they’re dry. “Don’t

Adding to scarcher2's code snippet above and moving mouse by only 1 pixel. I have moved the mouse twice so that some change occurs even if pointer is on extremes:

while(true){
            hal.delay(1000 * 30);       
            Point pObj = MouseInfo.getPointerInfo().getLocation();
            System.out.println(pObj.toString() + "x>>" + pObj.x + "  y>>" + pObj.y);
            hal.mouseMove(pObj.x + 1, pObj.y + 1);  
            hal.mouseMove(pObj.x - 1, pObj.y - 1);
            pObj = MouseInfo.getPointerInfo().getLocation();
            System.out.println(pObj.toString() + "x>>" + pObj.x + "  y>>" + pObj.y);
        }

9 best tools to prevent your PC from sleeping or locking, How do I stop my screen from going to sleep? You can use the program Caffeine caffiene to keep your workstation awake. You could run the program via the open command in os X.

Wouldn't all the suggestions moving the mouse back and forth drive the user crazy? I know I'd remove any app that would do that as soon as I can isolate it.

Keep Awake (Display, If you're looking for the best tool to keep your PC awake, we recommend Coffee FF or Don't Sleep, but you're more than welcome to try other  Rinse the clothes again, if your machine requires it. Some machines do not have a rinse cycle. Once you've drained the water, you can remove and dry your clothing. However, other machines require a specific rinse cycle. If your machine requires a rinse cycle, fill the machine with cold, clean water and set it to rinse.

Request: keeping computer awake without changing settings., Keep Awake (Display | System) is a lite extension that help you keep from turning off without changing the power settings in your machine. How to Keep Your Laptop On With the Lid Closed on Windows 10. Windows 10 normally puts your laptop into low-power sleep mode when you close the lid. This can be a problem when hooking your laptop up to an external monitor. Use the Control Panel—not Windows 10’s Settings app—to change this behavior.

Mouse Move Software (A simple JAVA code , There's actually an API in Windows designed to do just this, and it's how programs like PowerPoint or Media player keep the machine awake while they're​  Stimulate your senses. The easiest way to stay awake is to stimulate your senses. There are a number of things you can do to make sure your ears, eyes, and even your nose are alert and active. The more parts of your body that are alert, the less likely it will be that you will fall asleep.

How can I prevent a policy-enforced screen lock in Windows , (A simple JAVA code functionality) : Keep your computer awake without and create a One click Solution which can run one any machine ?

Comments
  • Why not just move the mouse 1 pixel as @Keng mentioned? This seems like it would drive the user nuts.
  • You could do that, but I didn't need to. I just posted the code I'm using. It took me like 2 minutes to write, and I haven't needed to change it. If you want to post a modified version to move it one pixel that would be cool.
  • I just made a "mousemover" like that some years ago: simu.wikidot.com/java:java#toc0 :-)
  • This does not work if the headless version of Java is installed (Linux-only).
  • You can also use Toolkit.getDefaultToolkit().getScreenSize() to obtain the screen size and use screen.width and screen.height instead of 640 and 480.
  • Very bad idea. If the program crashes then you've just changed user settings without permission. You should process the WM_POWERBROADCAST message instead.
  • This is definitely the danger of using this approach; this can be somewhat mitigated (in C++) by creating a class which makes this call in its constructor, and resets it in the destructor. Processing the WM_POWERBROADCAST event may also work, but only with certain flavors of Windows.
  • you can actually move it to exactly where it is hal.mouseMove(pObj.x, pObj.y);
  • moving it one pixel isn't noticable to anyone but cyborgs and cyborgs just devnull frustration anyway so your all good.
  • Why Robot.keyPress(123)?
  • I don't think it is a server. I think it runs on a workstation.
  • Correct, it is meant to run on a user's workstation and therefore I do not want to change any system settings. But good thought.
  • Good answer, but in this case I wouldn't dare ask for elevation. What's the point of security if every app asks for special privileges?
  • True, it is inconvenient to grant privileges for minor tasks. But if you wrap pmset in a suid script, that could solve the problem (the script can be executed as root without prompting). Of course, suid scripts can be potential security holes...