How to turn screensaver on (windows 7) by a code (in cmd)? [closed]

Answer 1

Putting together the cmd and vbs script ideas with the code from the answer to Launch System Screensaver from C# Windows Form I came up with the following:

using System;
using System.Runtime.InteropServices;

public static class LockDesktop
{
    [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
    private static extern IntPtr GetDesktopWindow();

    [DllImport("user32.dll")]
    private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

    [DllImport("user32.dll", EntryPoint = "LockWorkStation")]
    private static extern IntPtr LockWorkStation();

    private const int SC_SCREENSAVE = 0xF140;
    private const int WM_SYSCOMMAND = 0x0112;

    public static void SetScreenSaverRunning()
    {
        SendMessage(GetDesktopWindow(), WM_SYSCOMMAND, SC_SCREENSAVE, 0);
        LockWorkStation();
    }

    public static void Main()
    {
        LockDesktop.SetScreenSaverRunning();
    }
}

To build it, install the .NET Framework, copy and paste the above code into lock.cs, then run:

%SystemRoot%\Microsoft.NET\Framework\v3.5\csc.exe lock.cs

Put the created lock.exe in your path, after that, typing lock should engage the configured screen saver and lock your workstation.