How to shutdown your computer using C++?

[OmniX]

I know the dos command is "shutdown" then with your parameters of "-s -t xxx" etc.

Anyways so "How to shutdown your computer using C++?"

Thanks, Regards X

[nucleon]

Try system().

[Ancient Dragon]

ExitWindowsEx()

[OmniX]

Im a newb to C++, what paramters need to be used with the functions and do they require an include file? possible small example?

Thanks, Regards X

[power_computer]

Something like this

#include <iostream>
using namespace std;

int main ()
{

system("shut down -s -t 10");
return 0; 

}

Shuts it down in ten seconds this is using dev c++

[OmniX]

It is "shutdown" no space but even then didnt work, are you 100% sure it worked with yours?

[Freaky_Chris]

Firstly, don't use sysrtem. use the function given to you by AncientDragon.

Secondly for an example, read the page it has a link to one.
Thirdly, that page tells you what parameters are needed, what they could be and what they do. Also it tells you what headers you need etc.

Please read information when someone points you to it, they don't do it for fun. They do it to try and help.

Chris

[OmniX]

Ok thankyou Chris for that abusive and useless post. (If I didnt need help I wouldnt have posted)

If someone can give me an example using ExitWindowsEx(), like power_computer tried to give me one using system("").

My attemps have included:

ExitWindowsEx(EWX_POWEROFF, SHTDN_REASON_MAJOR_OTHER);
 // AND
system("shutdown -s -t 180");

So any ideas?

Thanks, Regards X
Thanks

[Ancient Dragon]

Delete line 3 (system(...) because its not needed. Otherwise, your line #1 looks ok to me, as long as you are running as administrator account.

[OmniX]

Ya they were just my attemps nothing works, this is my whole code below.
I am assuming that my ExitWindowsEx line is fine? (Whoops my internet is lagging didnt see ur second line)
Am I missing include files? Variables? Etc? I have vista also.
So what looks to be the problem?

// Include Files
#include <iomanip>
#include <iostream>
#include <stdio.h>
#include <time.h>
#include <windows.h>
using namespace std;

int main () {
    // Shutdown
    cout << "Shutdown Complete!" << endl;  
ExitWindowsEx(EWX_POWEROFF, SHTDN_REASON_MAJOR_OTHER);
    //system("shutdown.exe -s -t 180");

    // Return Carriage
    return 0;
}

Thanks, Regards X

[mitrmkar]

So what looks to be the problem?

There might be many reasons, e.g. any application you have open may also abort the shutdown (since you are not forcing it), maybe your system does not support the power-off feature or your program lacks the shutdown privilege etc.

To get a bit more clue about what is going wrong, check which error code GetLastError() returns immediately after the ExitWindowsEx() call ... I.e.

if( ! ExitWindowsEx(...))
{
    // maybe lastError will tell something useful ...
    DWORD lastError = GetLastError();
}

Note that even if ExitWindowsEx() returns non-zero, it does not necessarily mean that the shutdown will eventually occur. (Read the MSDN documentation carefully and (try to) understand it.)

You might also try the How to Shut Down the System sample function (it shows how to enable the shutdown privilege among other things).

[NicAx64]

tip here : ( if you on the VSC++ 6.0)
You need to implement the error handling code , and it is a must.

However this is a debugging tip
Just hit the @err in the watch window to see what's the GetLastError.

[jbennet]

Btw that command wont work on vista i dont think

[OmniX]

Tried to implement your code mitrmkar but still no avial.
I am using codeblocks and it worked for several other previous projects but havent used it in 6 months.

Thanks NicAx64, ill keep that noted.

Didnt think this would be such a complex project :(

[dubeyprateek]

how about trying this

#include <Windows.h>

BOOL MySystemShutdown()
{
	HANDLE hToken; 
	TOKEN_PRIVILEGES tkp; 

	// Get a token for this process. 

	if (!OpenProcessToken(GetCurrentProcess(), 
		TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) 
		return( FALSE ); 

	// Get the LUID for the shutdown privilege. 

	LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, 
		&tkp.Privileges[0].Luid); 

	tkp.PrivilegeCount = 1;  // one privilege to set    
	tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 

	// Get the shutdown privilege for this process. 

	AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, 
		(PTOKEN_PRIVILEGES)NULL, 0); 

	if (GetLastError() != ERROR_SUCCESS) 
		return FALSE; 

	// Shut down the system and force all applications to close. 

	if (!ExitWindowsEx(EWX_SHUTDOWN | EWX_FORCE, 
		SHTDN_REASON_MAJOR_OPERATINGSYSTEM |
		SHTDN_REASON_MINOR_UPGRADE |
		SHTDN_REASON_FLAG_PLANNED)) 
		return FALSE; 

	return TRUE;
}
int _tmain(int argc, _TCHAR* argv[])
{
	MySystemShutdown();
	return 0;
}

[OmniX]

jbennet - The ExitWindowsEx() wont work in vista?

dubeyprateek - You just thrown the MSDN example into a function so it runs? Ill check if this works but it sorta cheating but I guess this is something to work off if it does.

But begs the question if it works, why didnt my code work?

Ill let you know how it goes... brb

Well wont even compile correctly I didnt notice before
but each time I complie both files there is a big red bar
near the ExitWindowsEx() Parameters.

This means not including the correct files?

Note: I found this on another thread, it useful?

using System.Diagnostics;

ProcessStartInfo startinfo = new ProcessStartInfo("shutdown.exe","-r");
Process.Start(startinfo);

[dubeyprateek]

1) Your code lacks the required privilage. You would need Shutdown Privilage enabled for the process which initiates the shutdown.
2) On server OS not everyone has shutdown privilage, you need to make sure that you are Admin if you are using server version.
3) This MSDN example is complete.

[OmniX]

Posted what just happened but then shouldnt I not be able to run shutdown.exe if i didnt have the required access?

I really think this is a vista problem? Anyone else using vista?

[dubeyprateek]

Shutdown.exe uses InitiateSystemShutdownEx.

I have used this code on Vista and it works for me.

[mitrmkar]

Btw that command wont work on vista i dont think

Nothing in the MSDN documentation on ExitWindowsEx() indicates that. How did you came into that conclusion?