/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example19_1.cs illustrates requesting minimum permissions
*/
using System;
using System.IO;
using System.Security.Permissions;
[assembly:FileIOPermissionAttribute(SecurityAction.RequestMinimum,
All=@"c: emp")]
public class Example19_1
{
public static void Main()
{
// Create a new file to work with
FileStream fsOut = File.Create(@"c: emp est.txt");
// Create a StreamWriter to handle writing
StreamWriter sw = new StreamWriter(fsOut);
// And write some data
sw.WriteLine("'Twas brillig, and the slithy toves");
sw.WriteLine("Did gyre and gimble in the wabe.");
sw.Flush();
sw.Close();
}
}
Month: February 2011
Platform Helper
// Taken from....
//
// NAnt - A .NET build tool
// Copyright (C) 2001-2003 Gerry Shaw
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// Jaroslaw Kowalski (jkowalski@users.sourceforge.net)
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace Dotnet.Commons.IO {
[Serializable()]
internal class PlatformHelper {
public static readonly bool IsMono;
public static readonly bool IsWin32;
public static readonly bool IsUnix;
public static readonly bool PInvokeOK;
static PlatformHelper() {
// check a class in mscorlib to determine if we're running on Mono
if (Type.GetType("System.MonoType", false) != null) {
// we're on Mono
IsMono = true;
}
PlatformID platformID = Environment.OSVersion.Platform;
if (platformID == PlatformID.Win32NT || platformID == PlatformID.Win32Windows) {
IsWin32 = true;
}
// check for (non-)Unix platforms - see FAQ for more details
// http://www.mono-project.com/FAQ:_Technical#How_to_detect_the_execution_platform_.3F
int platform = (int) Environment.OSVersion.Platform;
if (platform == 4 || platform == 128) {
IsUnix = true;
}
if (IsWin32 && !IsMono) {
PInvokeOK = true;
}
}
private class PInvokeHelper {
[DllImport("kernel32.dll")]
private static extern long GetVolumeInformation(string PathName, StringBuilder VolumeNameBuffer, UInt32 VolumeNameSize, ref UInt32 VolumeSerialNumber, ref UInt32 MaximumComponentLength, ref UInt32 FileSystemFlags, StringBuilder FileSystemNameBuffer, UInt32 FileSystemNameSize);
public static long GetVolumeInformationWrapper(string PathName, StringBuilder VolumeNameBuffer, UInt32 VolumeNameSize, ref UInt32 VolumeSerialNumber, ref UInt32 MaximumComponentLength, ref UInt32 FileSystemFlags, StringBuilder FileSystemNameBuffer, UInt32 FileSystemNameSize) {
return GetVolumeInformation(PathName, VolumeNameBuffer, VolumeNameSize, ref VolumeSerialNumber, ref MaximumComponentLength, ref FileSystemFlags, FileSystemNameBuffer, FileSystemNameSize);
}
}
}
}
StartupPath
using System;
using System.Windows.Forms;
class MainClass {
static void Main(string[] args) {
OpenFileDialog dlg = new OpenFileDialog();
dlg.InitialDirectory = Application.StartupPath;
if (dlg.ShowDialog() == DialogResult.OK) {
Console.WriteLine(dlg.FileName);
}
}
}
Removing an Installed Message Filter
using System;
using System.Windows.Forms;
public class BlockLeftMouseButtonMessageFilter : IMessageFilter
{
const int WM_LBUTTONDOWN = 0x201;
public bool PreFilterMessage(ref Message m){
if(m.Msg == WM_LBUTTONDOWN)
{
Console.WriteLine("The left mouse button is down.");
Application.RemoveMessageFilter(this);
return true;
}
return false;
}
}
public class MainForm : Form
{
public static void Main()
{
MainForm MyForm = new MainForm();
BlockLeftMouseButtonMessageFilter MsgFilter = new BlockLeftMouseButtonMessageFilter();
Application.AddMessageFilter(MsgFilter);
Application.Run(MyForm);
}
public MainForm()
{
Text = "Message Filter Removal Test";
}
}
Installing a Message Filter
using System;
using System.Windows.Forms;
public class BlockLeftMouseButtonMessageFilter : IMessageFilter
{
const int WM_LBUTTONDOWN = 0x201;
const int WM_LBUTTONUP = 0x202;
public bool PreFilterMessage(ref Message m)
{
if(m.Msg == WM_LBUTTONDOWN)
{
Console.WriteLine("The left mouse button is down.");
return true;
}
if(m.Msg == WM_LBUTTONUP)
{
Console.WriteLine("The left mouse button is up.");
return true;
}
return false;
}
}
public class MainForm : Form
{
public static void Main()
{
MainForm MyForm = new MainForm();
BlockLeftMouseButtonMessageFilter MsgFilter = new BlockLeftMouseButtonMessageFilter();
Application.AddMessageFilter(MsgFilter);
Application.Run(MyForm);
}
public MainForm()
{
Text = "Message Filter Test";
}
}
Handling Application Events: On Thread Exit
using System;
using System.Threading;
using System.Reflection;
using System.Windows.Forms;
public class HelloWorldForm : Form
{
public HelloWorldForm()
{
Text = "Hello, WindowsForms!";
}
}
public class ApplicationEventHandlerClass
{
public void OnThreadExit(object sender, EventArgs e)
{
Console.WriteLine("The application's main thread is shutting down.");
}
}
public class MainClass
{
public static void Main()
{
HelloWorldForm FormObject = new HelloWorldForm();
ApplicationEventHandlerClass AppEvents = new ApplicationEventHandlerClass();
Application.ThreadExit += new EventHandler(AppEvents.OnThreadExit);
Application.Run(FormObject);
}
}
Handling Application Events: Thread Exception
using System;
using System.Threading;
using System.Reflection;
using System.Windows.Forms;
public class HelloWorldForm : Form
{
public HelloWorldForm()
{
Text = "Hello, WindowsForms!";
}
}
public class ApplicationEventHandlerClass
{
public void OnThreadException(object sender, ThreadExceptionEventArgs e)
{
Console.WriteLine("an exception thrown from an application thread was caught!");
}
}
public class MainClass
{
public static void Main()
{
HelloWorldForm FormObject = new HelloWorldForm();
ApplicationEventHandlerClass AppEvents = new ApplicationEventHandlerClass();
Application.ThreadException += new ThreadExceptionEventHandler(AppEvents.OnThreadException);
Application.Run(FormObject);
}
}

