What line of code could I use in C++ to disable energy saver?

Question

I want to prevent the monitor from going to sleep (the windows setting, not the monitor setting). I am using c++. What call do I make?

Answer 1

class KeepDisplayOn
{
public:
    KeepDisplayOn()
    {
        mPrevExecState = ::SetThreadExecutionState(ES_DISPLAY_REQUIRED | ES_SYSTEM_REQUIRED | ES_CONTINUOUS);
        ::SystemParametersInfo(SPI_GETSCREENSAVETIMEOUT, 0, &mPrevScreenSaver, 0);
        ::SystemParametersInfo(SPI_SETSCREENSAVETIMEOUT, FALSE, NULL, 0);
    }

    ~KeepDisplayOn()
    {
        ::SystemParametersInfo(SPI_SETSCREENSAVETIMEOUT, mPrevScreenSaver, NULL, 0);
        ::SetThreadExecutionState(mPrevExecState);
    }

private:
    UINT                mPrevScreenSaver;
    EXECUTION_STATE     mPrevExecState;
};