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More loop updates.

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This commit is contained in:
soukoku 2014-04-19 12:08:07 -04:00
parent 6a990619a8
commit 1957d2af3c
1 changed files with 64 additions and 39 deletions
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103
NTwain/MessageLoop.cs
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@ -18,35 +18,39 @@ namespace NTwain
public static MessageLoop Instance { get { return _instance; } }
Dispatcher _dispatcher;
bool _started;
WindowsHook _hook;
private MessageLoop() { }
public void EnsureStarted(WindowsHook.WndProcHook hook)
{
if (!_started)
if (_dispatcher == null)
{
// using this terrible hack so the new thread will start running before this function returns
var hack = new ManualResetEvent(false);
var loopThread = new Thread(new ThreadStart(() =>
using (var hack = new ManualResetEvent(false))
{
Debug.WriteLine("NTwain message loop started.");
_dispatcher = Dispatcher.CurrentDispatcher;
if (!Dsm.IsOnMono)
var loopThread = new Thread(new ThreadStart(() =>
{
_hook = new WindowsHook(hook);
}
hack.Set();
Dispatcher.Run();
_started = false;
}));
loopThread.IsBackground = true;
loopThread.SetApartmentState(ApartmentState.STA);
loopThread.Start();
hack.WaitOne();
hack.Close();
_started = true;
Debug.WriteLine("NTwain message loop is starting.");
_dispatcher = Dispatcher.CurrentDispatcher;
if (!Dsm.IsOnMono)
{
_hook = new WindowsHook(hook);
}
hack.Set();
Dispatcher.Run();
// if for whatever reason it ever gets here make everything uninitialized
_dispatcher = null;
if (_hook != null)
{
_hook.Dispose();
_hook = null;
}
}));
loopThread.IsBackground = true;
loopThread.SetApartmentState(ApartmentState.STA);
loopThread.Start();
hack.WaitOne();
}
}
}
@ -73,23 +77,27 @@ namespace NTwain
{
action();
}
else if (Dsm.IsOnMono)
{
using (var man = new ManualResetEvent(false))
{
_dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
{
try
{
action();
}
finally
{
man.Set();
}
}));
man.WaitOne();
}
}
else
{
//_dispatcher.Invoke(DispatcherPriority.Normal, action);
var man = new ManualResetEvent(false);
_dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
{
try
{
action();
}
finally
{
man.Set();
}
}));
man.WaitOne();
man.Close();
_dispatcher.Invoke(DispatcherPriority.Normal, action);
}
}
}
@ -99,8 +107,11 @@ namespace NTwain
/// This allows things to not depend on PresentationCore.dll at runtime on mono.
/// Not that everything works yet in mono but it's something.
/// </summary>
class WindowsHook
class WindowsHook : IDisposable
{
IDisposable _win;
WndProcHook _hook;
public WindowsHook(WndProcHook hook)
{
// hook into windows msg loop for old twain to post msgs.
@ -108,14 +119,14 @@ namespace NTwain
// CS_NOCLOSE, WS_DISABLED, and WS_EX_NOACTIVATE
var win = new HwndSource(0x0200, 0x8000000, 0x8000000, 0, 0, "NTWAIN_LOOPER", IntPtr.Zero);
Handle = win.Handle;
_hook = hook;
win.AddHook(WndProc);
_win = win;
_hook = hook;
}
public delegate void WndProcHook(ref MESSAGE winMsg, ref bool handled);
WndProcHook _hook;
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (_hook != null)
@ -154,5 +165,19 @@ namespace NTwain
int _x;
int _y;
}
#region IDisposable Members
public void Dispose()
{
if (_win != null)
{
((HwndSource)_win).RemoveHook(WndProc);
_win.Dispose();
_win = null;
}
}
#endregion
}
}