Code to hibernate PC

Question

I have the following code under a logoff event in a Windows app I have written:

  if (e.Reason == SessionEndReasons.Logoff)

        {

          string command = string.Format(@"/c POWERCFG /CHANGE /hibernate-timeout-dc 1");

          ProcessStartInfo cmdsi = new ProcessStartInfo("cmd.exe");

          cmdsi.WindowStyle = ProcessWindowStyle.Hidden;



          cmdsi.Arguments = command;

          Process cmd = Process.Start(cmdsi);

It changes the power options to make the PC go to hibernate one minute after the user logs off.

If you copy and paste this part of the code into a dos window you will see the change in Windows power options

 POWERCFG /CHANGE /hibernate-timeout-dc 1

It works OK when I install the app and then log off. But if I log back on and log off after that it gives me "the application was unable to start" error and an error code.
I can only log off once for it to work. Restarting doesn't fix it.
Would appreciate any help, thanks.

Sam Hobbs · Answer

No DOS and the Windows Command Prompt are not the same. It is frustrating that people still say DOS to refer to the command prompt window as if they are the same thing. Certainly it is possible to assume that DOS means command prompt but I really prefer that people just don't say DOS unless they truly mean DOS. A DOS window executes DOS programs in a DOS emulator. Visual Studio cannot create DOS programs. If your program is built using VS or if it is developed using C# or if it is using .Net from any language then it is not a DOS program. If you need to write a program that works when the user is logged off then you might not be able to use C#. Are you sure that applications can execute without a user being logged on? If not then perhaps you need to write a Windows Service (not a web service).

Peter Malone · Answer

The link above uses SetSuspendState which does not work when the user is logged off.

Suthish Nair · Answer

might helps Lock Logoff Reboot Shutdown Hibernate Standby in .Net

Peter Malone · Answer

I thought DOS and Windows Command prompt were the same thing. I am not sure waht window opens up when the code executes as it happens really quickly. Is the code I am using opening a DOs window?How do I change it to use windows command prompt? Edit: I have since changed the code to the following: string CommandLineString = @/c POWERCFG /CHANGE /hibernate-timeout-dc 1; System.Diagnostics.ProcessStartInfo myInfo = new System.Diagnostics.ProcessStartInfo(cmd.exe CommandLineString); myInfo.CreateNoWindow = true; System.Diagnostics.Process.Start(myInfo); //wait 5 seconds for this to finish System.Threading.Thread.Sleep(5000); It does the same thing;it works when the app is first installed and I log off but gives the error below everytime I log off after that. The application was unable to start correctly (0xc0000142). Click OK to close the application.

Sam Hobbs · Answer

Don't use DOS. In fact I think DOS does not even exist in the latest versions of Windows. Do you have the equivalent for use in a Windows Command Prompt window?