How to control PC auto power on using C or C ++?

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I want to develop a program which can control the PC auto power on. It must be realized by C or C++. But right now, I have no idea how.
By the way, the program should run on Windows, I also plan to develop it using VS2008. Who can tell me how to do that?

Posted 12-May-10 2:47am

CarmenCH

Updated 12-May-10 4:07am

Moak

v2

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Michel Godfroid · Accepted Answer · 2010-05-12T04:09:00

This will only work when the computer is in sleep or hibernate state:
the easy solution: just schedule a task, and check the 'wake system to run this task' box.
doing it in C/C++: read This[^]

Note that this will only work if the system is in the S3 or S4 state as stated above.
If the computer has been shutdown or powered off by other means, this will not work. It will also only work if the kit has an ACPI-compliant bios (Starting with Vista, windows does not accept anything else). Your mileage on XP may vary.

Some computers have a bios that allow you to setup a waking time through the setup screen. This is not controlled by windows, and controlling that requires a specific BIOS device driver.

Christian Graus · Accepted Answer · 2010-05-12T04:11:00

Solution 2

So the program will run on a different machine to the machine you want to power on ? Or are you so clueless as to think an off computer can run your code ? If the former, then you can set the wake on LAN functionality on the motherboard, and then wake it that way.

Posted 12-May-10 4:11am

Christian Graus

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Michel Godfroid 12-May-10 10:36am

Actually a computer in S4 state is pretty much off. If not setup for WOL, it's indistinguishable from power-off, except for the boot loader pointing to the hibernate file :-)