Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / AccessibilityHelperForXpWin2k3.cs / 1 / AccessibilityHelperForXpWin2k3.cs
//------------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace Microsoft.InfoCards
{
using System;
using System.IO;
using System.Text;
using Microsoft.Win32;
using System.Diagnostics; // Process
using System.Runtime.ConstrainedExecution;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Security.Principal; //WindowsIdentity
using Microsoft.InfoCards;
using Microsoft.InfoCards.Diagnostics;
using IDT = Microsoft.InfoCards.Diagnostics.InfoCardTrace;
using System.ComponentModel;
//
// Summary:
// This class will manage the lifetimes of the accessibility applications
// on the InfoCard desktop.
//
internal class AccessibilityHelperForXpWin2k3: IAccessibilityHelper, IDisposable
{
internal struct DownlevelAtData
{
public DownlevelAtData( string path, string image, string additional )
{
RegistryPath = path;
Image = image;
AdditionalImage = additional;
}
public string RegistryPath;
public string Image;
public string AdditionalImage;
};
static readonly string systemPath = Environment.GetFolderPath( Environment.SpecialFolder.System );
static readonly string baseRegistryPath = @"\SOFTWARE\Microsoft\Utility Manager\";
static readonly string keyName = @"Start on locked desktop";
internal static DownlevelAtData[] atApplications = new DownlevelAtData[ 3 ] {
new DownlevelAtData( "On-Screen Keyboard", "osk.exe", "msswchx" ),
new DownlevelAtData( "Magnifier", "magnify.exe", null ),
new DownlevelAtData( "Narrator", "narrator.exe", null ) };
const int OSKIndex = 0; // **** This should always be index of OSK.exe
// **** We need this for tablet PC scenarios
List m_restartList = new List();
ProcessManager m_manager;
bool m_fTabletPC = false;
//
// Summary:
// Constructs a new XP/Win2k3 Accessibility helper object.
//
// Parameters:
// fTabletPC - If true, we are running on a tablet.
//
public AccessibilityHelperForXpWin2k3( bool fTabletPC )
{
m_fTabletPC = fTabletPC;
}
void IAccessibilityHelper.Stop()
{
//
// Stop the applications by simply terminating the job
//
if( null != m_manager )
{
IDT.TraceDebug( "ICARDACCESS:Stopping the AT job if any AT apps are still running" );
m_manager.Dispose();
m_manager = null;
}
}
bool IAccessibilityHelper.RestartOnUsersDesktop( uint userProcessId, string userDesktop, WindowsIdentity userIdentity )
{
IDT.Assert( null == m_manager, "The AT applications must be terminated before they can be restarted" );
//
// Restart the previously running applications
// on the user's desktop.
// This code be called in a situation where the caller was already
// running as LSA so specify false to SystemIdentity constructor.
//
using( SystemIdentity lsa = new SystemIdentity( false ) )
{
foreach( int i in m_restartList )
{
//
// Start the application on the infocard desktop with the
// trusted user token.
//
string fullpath = Path.Combine( systemPath, atApplications[ i ].Image );
int processId = 0;
uint error = NativeMcppMethods.CreateProcessAsUserHelperWrapper(
fullpath,
"",
userProcessId,
userDesktop,
userIdentity.Name,
ref processId );
if( 0 == error )
{
IDT.TraceDebug( "ICARDACCESS:{0} restarted", atApplications[ i ].Image );
}
else
{
IDT.TraceDebug( "ICARDACCESS:{0} failed to restart.", atApplications[ i ].Image );
//
// Treat a failure to launch an AT application as non-fatal
//
}
}
}
m_restartList.Clear();
//
// This is always false as we do not want the agent to send any
// to do anything more.
//
return false;
}
void IAccessibilityHelper.RestartOnInfoCardDesktop(
uint ATApplicationFlags,
SafeNativeHandle hTrustedUserToken,
ref string trustedUserSid,
string infocardDesktop,
int userSessionId,
uint userProcessId,
WindowsIdentity userIdentity )
{
//
// I've specified false here (don't throw if already system) since this code
// is currently being called on a new thread. Moving forward, the timing issues
// associated with launching this should allow this to be called directly after the
// desktop is created. ([....])
//
using( SystemIdentity lsa = new SystemIdentity( false ) )
{
IDT.Assert( null == m_manager, "The AT applications are already started" );
m_restartList.Clear();
bool fOSKStarted = false;
string sid = userIdentity.User.Value;
for( int i = 0; i < atApplications.Length; i++ )
{
using( RegistryKey rk = Registry.Users.OpenSubKey( sid + baseRegistryPath + atApplications[ i ].RegistryPath ) )
{
bool imageRunning = false;
int? refValue = null;
if ( ( null != rk )
&& ( RegistryValueKind.DWord == rk.GetValueKind( keyName ) ) )
{
refValue = (int) rk.GetValue(keyName);
}
//
// We do need to kill and restart AT applications if we are on tablet PC,
// and OSK is running even though it is not configured to run.
//
if ( (null != refValue && 1 == refValue)
|| ( m_fTabletPC && OSKIndex == i ) )
{
//
// Find and Kill the process on the user's desktop
//
foreach( Process p in Process.GetProcessesByName( atApplications[ i ].Image.Substring( 0, atApplications[ i ].Image.LastIndexOf( '.' ) ) ) )
{
imageRunning = false;
if( userSessionId == p.SessionId )
{
//
// Indicate that image was running. We will need
// this information if additional images need to be killed
// for this particular AT application. Currnetly only OSK
// needs this.
//
imageRunning = true;
m_restartList.Add( i );
//
// Utility will handle exceptions correctly.
//
if( Utility.KillHelper( p ) )
{
IDT.TraceDebug( "ICARDACCESS:Killed {0} on desktop for user {1}", atApplications[ i ].Image, sid );
}
break;
}
}
//
// If we found the image and it has an additionalImage, see if
// the additional image is running and kill it.
//
if( imageRunning && null != atApplications[ i ].AdditionalImage )
{
foreach( Process p in Process.GetProcessesByName( atApplications[ i ].AdditionalImage ) )
{
if( userSessionId == p.SessionId )
{
//
// Just kill the process, no need to add to restart list as this
// process is never launched directly.
// KillHelper will handle exceptions properly.
//
if( Utility.KillHelper( p ) )
{
IDT.TraceDebug(
"ICARDACCESS:Added {0} to kill list on desktop for user {1}",
atApplications[ i ].Image,
sid );
break;
}
}
}
}
//
// Start the application on the infocard desktop with the
// trusted user token only if application is set to start
// as per the registry and the AT application flags indicate
// that AT applications are enabled.
//
if( null != refValue && 1 == refValue && 0 != ATApplicationFlags )
{
string fullpath = Path.Combine( systemPath, atApplications[ i ].Image );
if( null == m_manager )
{
m_manager = new ProcessManager( userSessionId, trustedUserSid );
}
bool fUseElevatedToken = false;
m_manager.AddProcess(
hTrustedUserToken,
ref trustedUserSid,
infocardDesktop,
userProcessId,
userIdentity,
fullpath,
"", // no command line
fUseElevatedToken );
if( OSKIndex == i )
{
fOSKStarted = true;
}
}
else
{
IDT.TraceDebug( "ICARDACCESS:{0} not launched for user {1}", atApplications[ i ].Image, sid );
}
}
}
}
//
// Handle the special case of tablet PC. Only start it if
// we have not already started it (that would be if AT apps
// are enabled and we have OSK turned on).
//
if( m_fTabletPC && false == fOSKStarted )
{
if( null == m_manager )
{
m_manager = new ProcessManager( userSessionId, trustedUserSid );
}
//
// Downlevel we do not have the concept of an elevated token.
//
bool fUseElevatedToken = false;
m_manager.AddProcess(
hTrustedUserToken,
ref trustedUserSid,
infocardDesktop,
userProcessId,
userIdentity,
Path.Combine( systemPath, atApplications[ OSKIndex ].Image ),
"", // no command line
fUseElevatedToken );
}
}
}
public void Dispose()
{
if( null != m_manager )
{
m_manager.Dispose();
m_manager = null;
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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