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As far as you know, we can call windows7 DLL's entry points via rundll32 <dll-file>,<Entry point> in command line. For example I lock my screen using below command in Windows Command Line :

rundll32.exe user32.dll,LockWorkStation

Now, I want to know if is there any way to turning off my monitor in such as this way? i.e. Is there any Entry-Point that I can call it in CMD and turn off my monitor?

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2 Answers 2

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I dont see anyway to achieve this in win7 or later by using the rundll32, but you can use an external app called nircmd.

To turn monitor off:

nircmd.exe monitor off

To turn monitor on:

nircmd.exe monitor on

You can put this in a bat file and make a shortcut of it.
You could also use a tool called WIZMO and use this in the command-line: 

wizmo.exe monoff
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In the command line/ or as .bat/ .cmd / .com file: powershell (Add-Type '[DllImport(\"user32.dll\")]^public static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);' -Name a -Pas)::SendMessage(-1,0x0112,0xF170,2)

As a direct powershell command, you can drop the escapes and powershell directive (and save as ps1 file as well. (Add-Type '[DllImport("user32.dll")]^public static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);' -Name a -Pas)::SendMessage(-1,0x0112,0xF170,2)

Of note this seems to leave a process forever running, that you need to either make sure you kill off later or something. I am working on that issue now, which is how I stumbled here. If I correct it I will leave an answer.

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