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Languages :: General :: Shutting down Win XP
By: omuyelijah Nigeria  Date: 03/01/2007 13:57:47  English  Points: 20 Status: Answered
Quality : Excellent
Hello VGR,

HAPPY NEW YEAR 2007.

Have 2 questions.

1. Recently, wrote a program in visual c++ 2005 express edition to access all working processes on my system (and could even start and stop processes like Task Manager). I want 2 shut down my WIN XP O.S. How do I do it? I thought about stopping the winlogon.exe process through my program.

2. I want to be able to detect events like having a flash drive plugged on my system. I searched d docs but the best close namespaces and classes I could get are Microsoft::Win32::SystemEvents, System::Diagnostics, System::Management
and d SerialPort class.

AUREVOIR MONSIEUR AND HAVE A BLISSFUL YEAR.
By: VGR Date: 03/01/2007 18:41:21 English  Type : Comment
for 1: I think you could work on the "windows workstation" process, but could also as well send a WM_SHUTDOWN message to the Windows message queue...

for 2: no solution, but basically USB inserts are readable via the evenlog (eventvwr.exe) so the trace calls could be intercepted (some Int derivation in the classical man-in-the-middle way), and also kind-of "serial" so perhaps a classical API on Serial bus(es) would provide you the functionality. Alternatively, you could just poll periodically the drive letters... to see if a new drive wasn't inserted.

have a nice new year too ;-)
By: omuyelijah Date: 15/01/2007 17:08:09 English  Type : Comment
Hello VGR,

Posted some replies but shocking dat I can't find any here after logging in. Don't know why sha.

Well, I can now detect events effectively using WMI programming and the System::Management namespace of .NET. I could also start and stop the windows calculator. However, couldn't still shutdown my system with it. The code doesn't shout any exceptions when run(it did b4 but I edited code and it stopped). I also took care of Privileges i.e. SeShutdownPrivilege. Below is d code snippet all variables declared appropriately.

System::Management::ManagementObjectSearcher^ obs;
System::Management::ManagementClass^ mc_s;
// mc_s has managementQuery="select * from Win32_OperatingSystem"
// shutd is d name of the button to begin shutdown
.
.
.

private: System::Void Shutd(System::Object^ Sender, System::EventArgs^ e){

array<System::Object^>^ myparam=nullptr;

System::Management::ManagementObjectCollection^ moc=obs.Get();

try{
/* dis code is similar to the one dat worked 4 starting and stopping calc.exe */

for each (System::Management::ManagementObject^ mo in moc){
mc_s->Invoke(gcnew System::Management::ManagementOperationsObserver(),"Shutdown",myparam);
}
}
catch(Exception^ e)
{ t_error->Text = e->Message; }


}

I've done everything possible. Changed somethings and it validated that I'm on d right track but I guess somethings missing. Can You pls help me out?

Maranatha.
By: omuyelijah Date: 16/01/2007 13:57:20 English  Type : Comment
Hello,

I never knew I was so close to d answer. I made a few changes to code as follows and then I could
Shutdown and reboot my system. Here it is (written in MS Visual C++ 2005 Express Edition)

1. enabled privileges;
2. used instance of System::Management::ManagementObject class instead of
System::Management::ManagementClass
3. Redefined parameters

Here is d code altogether

/* define my parameters for Win32Shutdown method.
* {1,nullptr} means shutdown
* {2, nullptr} means reboot
* etc
*/
array <System::Object^>^ myparam= {1,nullptr};

//object searcher should return collection of objects of d specified query
obs->Query= gcnew System::Management::ObjectQuery("select * from Win32_OperatingSystem");
System::Management::ManagementObjectCollection^ moc=obs->Get();


try{

for each (System::Management::ManagementObject^ mor in moc) {

/* enable privileges 4 my assembly. Don't
set dis 2 false anywhere within this
handler else it wont work */
mc_s->Scope->Options->EnablePrivileges=true;

/* invoke Win32Shutdown method
asynchronously */
mor->InvokeMethod(gcnew System::Management::ManagementOperationObserver(),"Win32Shutdown",myparam );

/* end loop (mor in moc) */ }

/* end try */ }

catch(Exception^ e)
{ t_error->Text = t_error->Text->Concat("MESSAGE: ",e->Message,"\r\n","SOURCE: ",e->StackTrace); }


I give some advice.

1. if you've .NET framework 2.0, check d permissions available 4 ur assembly(i.e. your program
or executable).How?
Control panel + Administrative Tools + .NeT Framework configuration 2.0
If it reports 'Unrestricted', ur safe 2 go on else u have 2 enable it for d process.

2. I saw a few codes over d internet dat I learnt 4rm particularly one in VB.net. d programmer
seemed 2 enable and then disable privileges. This I think will not work cos I tried it and it didn't
.He/she would have 2 enable privileges once and leave it like dat.

mc_s->Scope->Options->EnablePrivileges=true;

3. Thirdly, of all d InvokeMethods available, I found only 2 useful and co-operating, i.e. the one of four parameters and the other of three parameters (d one used above).

4. Lastly, like I also saw in another forum, I really won't agree dat there is
a bug in .NET 4 permissions.
By: omuyelijah Date: 16/01/2007 13:57:21 English  Type : Comment
Hello,

I never knew I was so close to d answer. I made a few changes to code as follows and then I could
Shutdown and reboot my system. Here it is (written in MS Visual C++ 2005 Express Edition)

1. enabled privileges;
2. used instance of System::Management::ManagementObject class instead of
System::Management::ManagementClass
3. Redefined parameters

Here is d code altogether

/* define my parameters for Win32Shutdown method.
* {1,nullptr} means shutdown
* {2, nullptr} means reboot
* etc
*/
array <System::Object^>^ myparam= {1,nullptr};

//object searcher should return collection of objects of d specified query
obs->Query= gcnew System::Management::ObjectQuery("select * from Win32_OperatingSystem");
System::Management::ManagementObjectCollection^ moc=obs->Get();


try{

for each (System::Management::ManagementObject^ mor in moc) {

/* enable privileges 4 my assembly. Don't
set dis 2 false anywhere within this
handler else it wont work */
mc_s->Scope->Options->EnablePrivileges=true;

/* invoke Win32Shutdown method
asynchronously */
mor->InvokeMethod(gcnew System::Management::ManagementOperationObserver(),"Win32Shutdown",myparam );

/* end loop (mor in moc) */ }

/* end try */ }

catch(Exception^ e)
{ t_error->Text = t_error->Text->Concat("MESSAGE: ",e->Message,"\r\n","SOURCE: ",e->StackTrace); }


I give some advice.

1. if you've .NET framework 2.0, check d permissions available 4 ur assembly(i.e. your program
or executable).How?
Control panel + Administrative Tools + .NeT Framework configuration 2.0
If it reports 'Unrestricted', ur safe 2 go on else u have 2 enable it for d process.

2. I saw a few codes over d internet dat I learnt 4rm particularly one in VB.net. d programmer
seemed 2 enable and then disable privileges. This I think will not work cos I tried it and it didn't
.He/she would have 2 enable privileges once and leave it like dat.

mc_s->Scope->Options->EnablePrivileges=true;

3. Thirdly, of all d InvokeMethods available, I found only 2 useful and co-operating, i.e. the one of four parameters and the other of three parameters (d one used above).

4. Lastly, like I also saw in another forum, I really won't agree dat there is
a bug in .NET 4 permissions.
By: omuyelijah Date: 16/01/2007 13:57:22 English  Type : Answer
Hello,

I never knew I was so close to d answer. I made a few changes to code as follows and then I could
Shutdown and reboot my system. Here it is (written in MS Visual C++ 2005 Express Edition)

1. enabled privileges;
2. used instance of System::Management::ManagementObject class instead of
System::Management::ManagementClass
3. Redefined parameters

Here is d code altogether

/* define my parameters for Win32Shutdown method.
* {1,nullptr} means shutdown
* {2, nullptr} means reboot
* etc
*/
array <System::Object^>^ myparam= {1,nullptr};

//object searcher should return collection of objects of d specified query
obs->Query= gcnew System::Management::ObjectQuery("select * from Win32_OperatingSystem");
System::Management::ManagementObjectCollection^ moc=obs->Get();


try{

for each (System::Management::ManagementObject^ mor in moc) {

/* enable privileges 4 my assembly. Don't
set dis 2 false anywhere within this
handler else it wont work */
mc_s->Scope->Options->EnablePrivileges=true;

/* invoke Win32Shutdown method
asynchronously */
mor->InvokeMethod(gcnew System::Management::ManagementOperationObserver(),"Win32Shutdown",myparam );

/* end loop (mor in moc) */ }

/* end try */ }

catch(Exception^ e)
{ t_error->Text = t_error->Text->Concat("MESSAGE: ",e->Message,"\r\n","SOURCE: ",e->StackTrace); }


I give some advice.

1. if you've .NET framework 2.0, check d permissions available 4 ur assembly(i.e. your program
or executable).How?
Control panel + Administrative Tools + .NeT Framework configuration 2.0
If it reports 'Unrestricted', ur safe 2 go on else u have 2 enable it for d process.

2. I saw a few codes over d internet dat I learnt 4rm particularly one in VB.net. d programmer
seemed 2 enable and then disable privileges. This I think will not work cos I tried it and it didn't
.He/she would have 2 enable privileges once and leave it like dat.

mc_s->Scope->Options->EnablePrivileges=true;

3. Thirdly, of all d InvokeMethods available, I found only 2 useful and co-operating, i.e. the one of four parameters and the other of three parameters (d one used above).

4. Lastly, like I also saw in another forum, I really won't agree dat there is
a bug in .NET 4 permissions.

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