C / C++ / MFC

26-Sep-07 22:41

When I try to shutdown remote pc Using the followind code it gives me the error of Access denied. Can anyone tell why this is happening.

HANDLE tokenHandle = INVALID_HANDLE_VALUE;
	TOKEN_PRIVILEGES newTokenPrivileges;
	TOKEN_PRIVILEGES oldTokenPrivileges;
	DWORD oldTokenPrivilegeSize = 0;
	LUID newLuid;

	DWORD dError;
	WCHAR CompName[] =  L"node129xp.radixweb.local"; 
	
	// Get Debug Privileges for current process
	OpenProcessToken(GetCurrentProcess(), (TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY), &tokenHandle);
	 

	// Get the LUID for SE_REMOTE_SHUTDOWN_NAME
	LookupPrivilegeValue(CompName, SE_REMOTE_SHUTDOWN_NAME, &newLuid);
	

	// Setup new token privileges
	newTokenPrivileges.PrivilegeCount = 1; // We need only one privilege


	// Copy over privilege value to one which we will send to system
	memcpy(&newTokenPrivileges.Privileges[0].Luid, &newLuid, sizeof(LUID)); // The privilege to get shutdown rights


	newTokenPrivileges.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; // Enable it !!

	
	// Adjust the process token privileges
	AdjustTokenPrivileges(tokenHandle, FALSE, &newTokenPrivileges, sizeof(TOKEN_PRIVILEGES), &oldTokenPrivileges, &oldTokenPrivilegeSize);
	

	
        if(!InitiateSystemShutdown(CompName, L"System is shutting down in 30 seconds", 30, TRUE, TRUE))
			dError = GetLastError();

David Crow27-Sep-07 3:28

27-Sep-07 3:28

Does it fail on all machines or just node129xp.radixweb.local?

What did LookupPrivilegeValue() and AdjustTokenPrivileges() return? If either of those fail, it obviously does no good to call LookupPrivilegeValue().

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

GauranG Shah27-Sep-07 4:13

27-Sep-07 4:13

I am checking return value after each and every WinAPI call and it doesn't fail after LookupPrivilegeValue and AdjustTokenPrivileges but fails on InitiateSystemShutdown when I use
DWORD dError = GetLastError();
Its Shows dError = 5. i.e. Access Denied.

If I give My Computer Name instead of anyone else's from my network it is working. But If I give any other Machines's name it gives above Error.

David Crow27-Sep-07 4:25

27-Sep-07 4:25

What happens if you use shutdown -m \\node129xp.radixweb.local -t 30 from a command prompt?

I tried your code on the two machines on my desk and it works as expected. The key difference may be that I belong to the Administrators group.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

GauranG Shah27-Sep-07 21:20

27-Sep-07 21:20

I am using win2000 Service Pack 4. And When tried the command you have told me it shows the following error Frown | :(

'SHUTDOWN' is not recognized as an internal or external command,
operable program or batch file.

I am not able to figureout what is the problem.Do have any Idea ?

David Crow28-Sep-07 2:22

28-Sep-07 2:22

GauranG33 wrote:
'SHUTDOWN' is not recognized...

Sorry, it must be a Windows XP thing.

GauranG33 wrote:
Do have any Idea ?

If I did, don't you reckon I would have offered it by now? Other than your own, can you shut down any PC on your network?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

GauranG Shah28-Sep-07 2:48

28-Sep-07 2:48

Hi,
I tried the same code to shutdown other computers in the LAN.But it is showing the same Error Access is denied. D'Oh! | :doh:

David Crow28-Sep-07 2:53

28-Sep-07 2:53

Have you ruled out your user account not having the correct privileges?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

GauranG Shah28-Sep-07 3:05

28-Sep-07 3:05

I think I have the administrative rights for the computer I am working. but not sure. If you can tell me how to check will be helpful to answer correctly.

David Crow28-Sep-07 3:11

28-Sep-07 3:11

GauranG33 wrote:
I think I have the administrative rights for the computer I am working.

Which the other (remote) computer couldn't care less about.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

GauranG Shah28-Sep-07 3:26

28-Sep-07 3:26

Then What do you think what should be the problem.I have tried to google the thing but getting the same line of code,that is not working in my case.

David Crow28-Sep-07 3:47

28-Sep-07 3:47

GauranG33 wrote:
Then What do you think what should be the problem.

Have you considered joining the Domain Administrators group?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

GauranG Shah28-Sep-07 4:02

28-Sep-07 4:02

No I dont have Idea about that. Can you guide me through that.

David Crow28-Sep-07 4:17

DLGTemplate MapDialogRect() problem

28-Sep-07 4:17

GauranG33 wrote:
No I dont have Idea about that. Can you guide me through that.

Don't you have a Network Administrator?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

prithaa26-Sep-07 21:55

prithaa

26-Sep-07 21:55

Hello,

I have a dialog without resources which works fine.In a class derived from CDialog I have a variable of type DLGTemplate.This variable has default x,y,cx,cy values set in the constructor.

But I want to increase the height and width of the dialog box in accordance with the number of windows controls added to the dialog box.I am adding windows controls in the OnCreate() function of Dialog class like this.
CRect Rect(10,10,100,100);
CComboBox* Combo = new CComboBox;
Combo->Create(WS_VISIBLE | WS_CHILD |CBS_SORT, Rect, this, ID);

How do I find the relation between the above Rect's coordinates and the coordinates of the dialog box?
I tried MapDialogRect but I don't understand what exactly is done there?
Please help.

Thanks
Prithaa

Re: DLGTemplate MapDialogRect() problem

Jason Teagle26-Sep-07 22:38

Jason Teagle

26-Sep-07 22:38

The co-ordinates specified in the control's Create() call are specified in the parent's (your dialogue's) CLIENT co-ordinates.

'Client' co-ords have their (0, 0) at the top-left of the space *within* any border and title bar the dialogue has. If it has no border and no title bar, then this is the same as the top-left of the full dialogue.

If you want to know how far the control is from the top-left of yoour dialogue and you have a title bar and / or border, then you need to get the dialogues 'window' rect, and the control's 'window' rect, and then you can calculate the offset.

Note, though, that if you ask a control for its client rect, it gives you co-ordinates relative to *its*own* client area, not its parent.

If you ask a control or window for its 'window' rect, it gicves you co-ords relative to *the*screen's* top-left.

So, to get the offset from a dialogue's client arrea to a control's top-left, do this:

CRect rctControl ;
MyControl.GetWindowRect(&rctControl);
// It's relative to top-left of screen.
MyDlg.ScreenToClient(&rctControl);
// Now, relative to top-left of dlg's client area.

To get it relative to the full dlg's top-left (ignoring title bar and border):

CRect rctControl ;
MyControl.GetWindowRect(&rctControl);
// It's relative to top-left of screen.
CRect rctDlg ;
MyDlg.GetWindowRect(&rctDlg);
rctControl.OffsetRect(rctDlg.left - rctControl.left,
rctDlg.top - rctControl.top);
// Now, relative to top-left of dlg's full area.

Re: DLGTemplate MapDialogRect() problem

Mark Salsbery27-Sep-07 5:43

Mark Salsbery

27-Sep-07 5:43

If you know your client area size, and you want to calculate the window
size that will give you that client area size, you can use:

CWnd::CalcWindowRect() (MFC)

or

AdjustWindowRect()/AdjustWindowRectEx() (Win32)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

LPT Listener using thread

TPN26-Sep-07 21:05

TPN

26-Sep-07 21:05

Hi All,

I am writing an application which checks LPT signal for doing something. My code looks like:

void LPTThread()
{
while (1)
{
if (ReadLPT(pinX) = signal level Y) {do something;}
}
//pin is one of pin of LPT port
//signal level of each pin is 0 or 1 at a time
}

This loop cause the CPU usage always 100%, is there any way to prevent it? Can we catch this change by any event handler, it mean when a change occurs at LPT or, this event handler will be called?

Thank you for your help.

Cedric Moonen26-Sep-07 22:19

Cedric Moonen

26-Sep-07 22:19

I never heard about a function called ReadLPT (and google wasn't of any help), from where is that coming from ? Can you give more details ?
Anyway, for serial communication (so COM ports), you can use functions like WaitCommEvent. I suppose there should be something similar for you.

Cédric Moonen
Software developer

Charting control [v1.2]

TPN27-Sep-07 0:44

TPN

27-Sep-07 0:44

Dear Moonen,

Thank for your answer. But I need to clarify that ReadLPT is just only my pseudo code - the code that is responsible for reading LPT port signal/information.

Thanks.

Cedric Moonen27-Sep-07 4:34

Cedric Moonen

27-Sep-07 4:34

Ok but that doesn't help. Which functions are you using exactly to access the port ?

Cédric Moonen
Software developer

Charting control [v1.2]