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Mar 20th, 2009

Re: How to shutdown your computer using C++?

Quote ...

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.

C++ Syntax (Toggle Plain Text)
if( ! ExitWindowsEx(...))
{
    // maybe lastError will tell something useful ...
    DWORD lastError = GetLastError();
}
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).

mitrmkar

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

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.

Last edited by NicAx64; Mar 20th, 2009 at 11:32 am.

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Mar 20th, 2009

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Re: How to shutdown your computer using C++?

Btw that command wont work on vista i dont think

jbennet

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

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

OmniX

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

how about trying this

C++ Syntax (Toggle Plain Text)
#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;
}
#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;
}

dubeyprateek

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

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?

cpp Syntax (Toggle Plain Text)
using System.Diagnostics;
 
ProcessStartInfo startinfo = new ProcessStartInfo("shutdown.exe","-r");
Process.Start(startinfo);
using System.Diagnostics;

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

Last edited by OmniX; Mar 20th, 2009 at 11:56 am.

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

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.

dubeyprateek

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

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?

OmniX

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

Shutdown.exe uses InitiateSystemShutdownEx.

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

dubeyprateek

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Mar 20th, 2009

Re: How to shutdown your computer using C++?

Click to Expand / Collapse Quote originally posted by jbennet ...

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?

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