C# Discussion Boards - CodeProject

help me to correct my code

29-Aug-05 20:03

I don't believe you can, unless you owner draw. A label just uses one font, and fonts do not have the ability to superscript. You can put the number on the end in a smaller font, in a new label, or owner draw ( that is, write your own label class )

Christian Graus - Microsoft MVP - C++

sajikp29-Aug-05 19:39

sajikp

29-Aug-05 19:39

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace shutdown
{
///

/// Summary description for Form1.
///

public class frmshutdown : System.Windows.Forms.Form
{
internal System.Windows.Forms.GroupBox grpQuestion;
internal System.Windows.Forms.Button btnDo;
internal System.Windows.Forms.RadioButton rdbLock;
internal System.Windows.Forms.RadioButton rdbLogoff;
internal System.Windows.Forms.RadioButton rdbRestart;
internal System.Windows.Forms.RadioButton rdbShutdown;
///

/// Required designer variable.
///

private System.ComponentModel.Container components = null;

public frmshutdown()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent call
//
}

///

/// Clean up any resources being used.
///

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
///

/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///

private void InitializeComponent()
{
this.grpQuestion = new System.Windows.Forms.GroupBox();
this.btnDo = new System.Windows.Forms.Button();
this.rdbLock = new System.Windows.Forms.RadioButton();
this.rdbLogoff = new System.Windows.Forms.RadioButton();
this.rdbRestart = new System.Windows.Forms.RadioButton();
this.rdbShutdown = new System.Windows.Forms.RadioButton();
this.grpQuestion.SuspendLayout();
this.SuspendLayout();
//
// grpQuestion
//
this.grpQuestion.Controls.Add(this.btnDo);
this.grpQuestion.Controls.Add(this.rdbLock);
this.grpQuestion.Controls.Add(this.rdbLogoff);
this.grpQuestion.Controls.Add(this.rdbRestart);
this.grpQuestion.Controls.Add(this.rdbShutdown);
this.grpQuestion.Location = new System.Drawing.Point(26, 56);
this.grpQuestion.Name = "grpQuestion";
this.grpQuestion.Size = new System.Drawing.Size(240, 160);
this.grpQuestion.TabIndex = 1;
this.grpQuestion.TabStop = false;
this.grpQuestion.Text = "What do you want to do?";
//
// btnDo
//
this.btnDo.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
this.btnDo.Location = new System.Drawing.Point(160, 120);
this.btnDo.Name = "btnDo";
this.btnDo.Size = new System.Drawing.Size(64, 23);
this.btnDo.TabIndex = 5;
this.btnDo.Text = "Do";
this.btnDo.Click += new System.EventHandler(this.btnDo_Click);
//
// rdbLock
//
this.rdbLock.Location = new System.Drawing.Point(16, 120);
this.rdbLock.Name = "rdbLock";
this.rdbLock.Size = new System.Drawing.Size(128, 24);
this.rdbLock.TabIndex = 4;
this.rdbLock.Text = "Lock Computer";
//
// rdbLogoff
//
this.rdbLogoff.Location = new System.Drawing.Point(16, 88);
this.rdbLogoff.Name = "rdbLogoff";
this.rdbLogoff.Size = new System.Drawing.Size(128, 24);
this.rdbLogoff.TabIndex = 3;
this.rdbLogoff.Text = "Log off";
//
// rdbRestart
//
this.rdbRestart.Location = new System.Drawing.Point(16, 56);
this.rdbRestart.Name = "rdbRestart";
this.rdbRestart.Size = new System.Drawing.Size(128, 24);
this.rdbRestart.TabIndex = 2;
this.rdbRestart.Text = "Restart";
//
// rdbShutdown
//
this.rdbShutdown.Checked = true;
this.rdbShutdown.Location = new System.Drawing.Point(16, 24);
this.rdbShutdown.Name = "rdbShutdown";
this.rdbShutdown.Size = new System.Drawing.Size(128, 24);
this.rdbShutdown.TabIndex = 1;
this.rdbShutdown.TabStop = true;
this.rdbShutdown.Text = "Shutdown";
//
// frmshutdown
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Controls.Add(this.grpQuestion);
this.Name = "frmshutdown";
this.Text = "shutdown";
this.Load += new System.EventHandler(this.frmshutdown_Load);
this.grpQuestion.ResumeLayout(false);
this.ResumeLayout(false);

}
#endregion

///

/// The main entry point for the application.
///

[STAThread]
static void Main()
{
Application.Run(new frmshutdown());
}

private void btnDo_Click(object sender, System.EventArgs e)
{
shutmode st=new shutmode();
if(rdbShutdown.Checked == true)
st.Shutdown(); //for shutdown
else if(rdbRestart.Checked == true)
st.Restart(); // Restart

else if(rdbLogoff.Checked == true)
st.LogOff(); //' Log off
else if(rdbLock.Checked ==true)
st.LockTheComputer();//' Lock Workstation
else
MessageBox.Show("Invalid option", "Illegal operation", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
// ' Invalid Radio Button (should never been shown)

}

}
}

using System;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.IO;
namespace shutdown
{
///

/// Summary description for shutmode.
///

public class shutmode
{
public shutmode()
{
//
// TODO: Add constructor logic here
//
}

// Constants
const int SE_PRIVILEGE_ENABLED=2;
const int TOKEN_QUERY=8;
const int TOKEN_ADJUST_PRIVILEGES=32;
const string SE_SHUTDOWN_NAME= "SeShutdownPrivilege";
//' Exit Windows Constant
const int EWX_LOGOFF = 0;
const int EWX_SHUTDOWN= 1;
const int EWX_REBOOT = 2;
const int EWX_FORCE = 4;
const int EWX_POWEROFF = 8;
const int EWX_FORCEIFHUNG= 16;
[StructLayout(LayoutKind.Sequential, Pack=1)]
//'Structure

internal struct Luid
{
public int Count;
public long luid;
public int Attr;
};

//End Structure 'TokPriv1Luid
//' Lock Workstation

[DllImport("user32.dll", ExactSpelling=true)]
static extern bool LockWorkStation();

//' Get Current Processes
[DllImport("kernel32.dll", ExactSpelling=true)]
static extern IntPtr GetCurrentProcess();

[DllImport("advapi32.dll", SetLastError=true)]
static extern bool OpenProcessToken(IntPtr h, int acc,IntPtr phtok);

//' Look up Priviledge Value

[DllImport("advapi32.dll", SetLastError=true)]
internal static extern bool LookupPrivilegeValue(string host, string name,ref long luid) ;

// Adjust Token Priviledges

[DllImport("advapi32.dll", ExactSpelling=true, SetLastError=true)]
internal static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall, Luid newst, int len, IntPtr prev, IntPtr relen) ;

//' Exit Windows

[DllImport("user32.dll", ExactSpelling=true, SetLastError=true)]
internal static extern bool ExitWindowsEx(int flg, int rea) ;

//' Exit Windows Sub

private void DoExitWindows(int flg)
{
Luid tp;
bool s;
int h1,h2;
IntPtr hproc = GetCurrentProcess();
IntPtr htok = IntPtr.Zero;
OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, htok);
tp.Count = 1;
tp.luid = 0;
tp.Attr = SE_PRIVILEGE_ENABLED;
LookupPrivilegeValue(null, SE_SHUTDOWN_NAME,ref tp.luid);
AdjustTokenPrivileges(htok, false, tp, 0, IntPtr.Zero, IntPtr.Zero);
ExitWindowsEx(flg,0);

}

//' Shutdown

public void Shutdown()
{
DoExitWindows(EWX_SHUTDOWN);
}

// ' Restart
public void Restart()
{
DoExitWindows(EWX_REBOOT | EWX_FORCE);
}
//' Log off
public void LogOff()
{
DoExitWindows(EWX_LOGOFF);
}
//' Lock Workstation

public void LockTheComputer()
{
LockWorkStation();
}

}
}

-- modified at 1:46 Tuesday 30th August, 2005

Christian Graus29-Aug-05 19:42

29-Aug-05 19:42

It would help if instead of posting a million lines of code without comment, you told us what's wrong with it. Does it compile ? Does it do what you expect ? What do you expect ?

Christian Graus - Microsoft MVP - C++

sajikp29-Aug-05 19:58

sajikp

29-Aug-05 19:58

This program is for shutdown,logoff,restart the system.
the pgm is compile without any error.
The problem is when we call the function ,for example shutdown ,the control is going to the ExitWindows()function.But its returned value is "0";so the shutdown command fails.i am unable to detect why the returned value is 0.

Christian Graus29-Aug-05 20:01

29-Aug-05 20:01

OK, that's a lot more helpful Smile | :)

So long as we're copying and pasting code, here's the code I found online to do this when I had the same problem as you. I think in a nutshell, some sort of privilege thing needs to happen first, which gives your app the *right* to shut down the PC.

public class Shutdown
{
[StructLayout(LayoutKind.Sequential, Pack=1)]
internal struct TokPriv1Luid
{
public int Count;
public long Luid;
public int Attr;
}

[DllImport("kernel32.dll", ExactSpelling=true) ]
internal static extern IntPtr GetCurrentProcess();

[DllImport("advapi32.dll", ExactSpelling=true, SetLastError=true) ]
internal static extern bool OpenProcessToken( IntPtr h, int acc, ref IntPtr phtok );

[DllImport("advapi32.dll", SetLastError=true) ]
internal static extern bool LookupPrivilegeValue( string host, string name, ref long pluid );

[DllImport("advapi32.dll", ExactSpelling=true, SetLastError=true) ]
internal static extern bool AdjustTokenPrivileges( IntPtr htok, bool disall,
ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen );

[DllImport("user32.dll", ExactSpelling=true, SetLastError=true) ]
internal static extern bool ExitWindowsEx( int flg, int rea );

internal const int SE_PRIVILEGE_ENABLED = 0x00000002;
internal const int TOKEN_QUERY = 0x00000008;
internal const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
internal const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";
internal const int EWX_LOGOFF = 0x00000000;
internal const int EWX_SHUTDOWN = 0x00000001;
internal const int EWX_REBOOT = 0x00000002;
internal const int EWX_FORCE = 0x00000004;
internal const int EWX_POWEROFF = 0x00000008;
internal const int EWX_FORCEIFHUNG = 0x00000010;

private static void DoExitWin( int flg )
{
bool ok;
TokPriv1Luid tp;
IntPtr hproc = GetCurrentProcess();
IntPtr htok = IntPtr.Zero;
ok = OpenProcessToken( hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok );
tp.Count = 1;
tp.Luid = 0;
tp.Attr = SE_PRIVILEGE_ENABLED;
ok = LookupPrivilegeValue( null, SE_SHUTDOWN_NAME, ref tp.Luid );
ok = AdjustTokenPrivileges( htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero );
ok = ExitWindowsEx( flg, 0 );
}

public static void ShutDown()
{
DoExitWin( EWX_POWEROFF | EWX_FORCE );
}
}
}

Christian Graus - Microsoft MVP - C++

-- modified at 2:02 Tuesday 30th August, 2005

sajikp29-Aug-05 20:54

sajikp

29-Aug-05 20:54

First Thanks for helping me.

I am a new programmer.So i want to know what happend inside my program(means why i am getting the return value 0 from the Exitwindows()).Expecting the reason for that thing

Problems with FileStream

Tehnoon Raza29-Aug-05 19:13

Tehnoon Raza

29-Aug-05 19:13

I am using the FileStream class to write and read from files. I am using it in a server to which the clients can connect and read data from the file(s). The server, on the other hand is also writing data to the files after regular intervals of time. To write the data to the file, the server creates a FileStream object in the following way:
FileStream dataStream = new FileStream(dataFileName, FileMode.Open, FileAccess.Write);
As is clear from above, the server opens the file in write only mode and it shouldn't be a problem to read from the file.
To read data from the file, following code is used:
FileStream stream = new FileStream(fileNames[i].ToString(), FileMode.Open, FileAccess.Read);
As is clear here, I open the file in read-only mode. The problem is, that if the above code executes during the time when the server has already opened the stream for writing, I get an exception (Cannot access the file as it is being used by some other process).
Any help in this regard would be highly appreciated

Christian Graus29-Aug-05 19:24

29-Aug-05 19:24

No matter how logical it seems to you, Windows will not allow it, one process needs to release the file before another can access it. In the lack of deterministic destruction, that means the using keyword, or an explicit call to Close().

Christian Graus - Microsoft MVP - C++

Member 171916929-Aug-05 19:34

Member 1719169

29-Aug-05 19:34

Thanks a lot Graus for your response, but still, is there any way out of this problem?

Christian Graus29-Aug-05 19:40

29-Aug-05 19:40

Tehnoon Raza wrote:
Thanks a lot Graus for your response,

No worries. I'm interested, why do so many people respond to me by my surname ?

Tehnoon Raza wrote:
is there any way out of this problem?

As far as I am aware, no.

Christian Graus - Microsoft MVP - C++

Matt Gerrans29-Aug-05 20:09

Matt Gerrans

29-Aug-05 20:09

No worries. I'm interested, why do so many people respond to me by my surname ?

Maybe they noticed that you are often grousing about Rent-a-coder in the lounge? Poke tongue | ;-P

Matt Gerrans