public DialogResult ShowDialog(out object objResult, object objConstructParam)
{
objResult = null;
ProcessMessagesEx();
// Creating a window on the new desktop spawns a CtfMon.exe child
// process by default. On Windows Vista, this process is terminated
// correctly when the desktop is closed. However, on Windows 7 it
// isn't terminated (probably a bug); creating multiple desktops
// accumulates CtfMon.exe child processes.
ChildProcessesSnapshot cpsCtfMons = new ChildProcessesSnapshot(
"CtfMon.exe");
ClipboardEventChainBlocker ccb = new ClipboardEventChainBlocker();
byte[] pbClipHash = ClipboardUtil.ComputeHash();
SecureThreadInfo stp = new SecureThreadInfo();
foreach (Screen sc in Screen.AllScreens)
{
Bitmap bmpBack = UIUtil.CreateScreenshot(sc);
if (bmpBack != null)
{
UIUtil.DimImage(bmpBack);
}
stp.BackgroundBitmaps.Add(bmpBack);
}
DialogResult dr = DialogResult.None;
try
{
uint uOrgThreadId = NativeMethods.GetCurrentThreadId();
IntPtr pOrgDesktop = NativeMethods.GetThreadDesktop(uOrgThreadId);
string strName = "D" + Convert.ToBase64String(
CryptoRandom.Instance.GetRandomBytes(16),
Base64FormattingOptions.None);
strName = strName.Replace(@"+", string.Empty);
strName = strName.Replace(@"/", string.Empty);
strName = strName.Replace(@"=", string.Empty);
if (strName.Length > 15)
{
strName = strName.Substring(0, 15);
}
NativeMethods.DesktopFlags deskFlags =
(NativeMethods.DesktopFlags.CreateMenu |
NativeMethods.DesktopFlags.CreateWindow |
NativeMethods.DesktopFlags.ReadObjects |
NativeMethods.DesktopFlags.WriteObjects |
NativeMethods.DesktopFlags.SwitchDesktop);
IntPtr pNewDesktop = NativeMethods.CreateDesktop(strName,
null, IntPtr.Zero, 0, deskFlags, IntPtr.Zero);
if (pNewDesktop == IntPtr.Zero)
{
throw new InvalidOperationException();
}
bool bNameSupported = NativeMethods.DesktopNameContains(pNewDesktop,
strName).GetValueOrDefault(false);
Debug.Assert(bNameSupported);
stp.ThreadDesktop = pNewDesktop;
stp.FormConstructParam = objConstructParam;
Thread th = new Thread(this.SecureDialogThread);
th.CurrentCulture = Thread.CurrentThread.CurrentCulture;
th.CurrentUICulture = Thread.CurrentThread.CurrentUICulture;
th.Start(stp);
SecureThreadState st = SecureThreadState.None;
while (st != SecureThreadState.Terminated)
{
th.Join(150);
lock (stp) { st = stp.State; }
if ((st == SecureThreadState.ShowingDialog) && bNameSupported)
{
IntPtr hCurDesk = NativeMethods.OpenInputDesktop(0,
false, NativeMethods.DesktopFlags.ReadObjects);
if (hCurDesk == IntPtr.Zero)
{
Debug.Assert(false); continue;
}
if (hCurDesk == pNewDesktop)
{
if (!NativeMethods.CloseDesktop(hCurDesk))
{
Debug.Assert(false);
}
continue;
}
bool?obOnSec = NativeMethods.DesktopNameContains(hCurDesk, strName);
if (!NativeMethods.CloseDesktop(hCurDesk))
{
Debug.Assert(false);
}
lock (stp) { st = stp.State; } // Update; might have changed
if (obOnSec.HasValue && !obOnSec.Value &&
(st == SecureThreadState.ShowingDialog))
{
HandleUnexpectedDesktopSwitch(pOrgDesktop, pNewDesktop, stp);
}
}
}
if (!NativeMethods.SwitchDesktop(pOrgDesktop))
{
Debug.Assert(false);
}
NativeMethods.SetThreadDesktop(pOrgDesktop);
th.Join(); // Ensure thread terminated before closing desktop
if (!NativeMethods.CloseDesktop(pNewDesktop))
{
Debug.Assert(false);
}
NativeMethods.CloseDesktop(pOrgDesktop); // Optional
dr = stp.DialogResult;
objResult = stp.ResultObject;
}
catch (Exception) { Debug.Assert(false); }
byte[] pbNewClipHash = ClipboardUtil.ComputeHash();
if ((pbClipHash != null) && (pbNewClipHash != null) &&
!MemUtil.ArraysEqual(pbClipHash, pbNewClipHash))
{
ClipboardUtil.Clear();
}
ccb.Dispose();
foreach (Bitmap bmpBack in stp.BackgroundBitmaps)
{
if (bmpBack != null)
{
bmpBack.Dispose();
}
}
stp.BackgroundBitmaps.Clear();
cpsCtfMons.TerminateNewChildsAsync(4100);
// If something failed, show the dialog on the normal desktop
if (dr == DialogResult.None)
{
Form f = m_fnConstruct(objConstructParam);
dr = f.ShowDialog();
objResult = m_fnResultBuilder(f);
UIUtil.DestroyForm(f);
}
return(dr);
}
public DialogResult ShowDialog(out object objResult, object objConstructParam)
{
objResult = null;
ProcessMessagesEx();
ClipboardEventChainBlocker ccb = new ClipboardEventChainBlocker();
byte[] pbClipHash = ClipboardUtil.ComputeHash();
Bitmap bmpBack = UIUtil.CreateScreenshot();
if (bmpBack != null)
{
UIUtil.DimImage(bmpBack);
}
DialogResult dr = DialogResult.None;
try
{
uint uOrgThreadId = NativeMethods.GetCurrentThreadId();
IntPtr pOrgDesktop = NativeMethods.GetThreadDesktop(uOrgThreadId);
string strName = "D" + Convert.ToBase64String(
Guid.NewGuid().ToByteArray(), Base64FormattingOptions.None);
strName = strName.Replace(@"+", string.Empty);
strName = strName.Replace(@"/", string.Empty);
strName = strName.Replace(@"=", string.Empty);
NativeMethods.DesktopFlags deskFlags =
NativeMethods.DesktopFlags.CreateMenu |
NativeMethods.DesktopFlags.CreateWindow |
NativeMethods.DesktopFlags.ReadObjects |
NativeMethods.DesktopFlags.WriteObjects |
NativeMethods.DesktopFlags.SwitchDesktop;
IntPtr pNewDesktop = NativeMethods.CreateDesktop(strName,
null, IntPtr.Zero, 0, deskFlags, IntPtr.Zero);
if (pNewDesktop == IntPtr.Zero)
{
throw new InvalidOperationException();
}
SecureThreadParams stp = new SecureThreadParams();
stp.BackgroundBitmap = bmpBack;
stp.ThreadDesktop = pNewDesktop;
stp.FormConstructParam = objConstructParam;
Thread th = new Thread(this.SecureDialogThread);
th.CurrentCulture = Thread.CurrentThread.CurrentCulture;
th.CurrentUICulture = Thread.CurrentThread.CurrentUICulture;
th.Start(stp);
th.Join();
if (!NativeMethods.SwitchDesktop(pOrgDesktop))
{
Debug.Assert(false);
}
NativeMethods.SetThreadDesktop(pOrgDesktop);
if (!NativeMethods.CloseDesktop(pNewDesktop))
{
Debug.Assert(false);
}
NativeMethods.CloseDesktop(pOrgDesktop);
dr = stp.DialogResult;
objResult = stp.ResultObject;
}
catch (Exception) { Debug.Assert(false); }
byte[] pbNewClipHash = ClipboardUtil.ComputeHash();
if ((pbClipHash != null) && (pbNewClipHash != null) &&
!MemUtil.ArraysEqual(pbClipHash, pbNewClipHash))
{
ClipboardUtil.Clear();
}
ccb.Release();
if (bmpBack != null)
{
bmpBack.Dispose();
}
// If something failed, show the dialog on the normal desktop
if (dr == DialogResult.None)
{
Form f = m_fnConstruct(objConstructParam);
dr = f.ShowDialog();
objResult = m_fnResultBuilder(f);
UIUtil.DestroyForm(f);
}
return(dr);
}