lsm/ntwain
1
0
Fork 0
mirror of https://github.com/soukoku/ntwain.git synced 2026-01-02 04:17:08 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

Internal loop and readme update.

Browse Source
This commit is contained in:
soukoku
2014-04-19 09:10:15 -04:00
parent 72760ddad2
commit 6a990619a8
5 changed files with 103 additions and 73 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
NTwain/MessageLoop.cs
View File

@@ -2,6 +2,7 @@
using NTwain.Triplets;
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Interop;
using System.Windows.Threading;
@@ -18,11 +19,10 @@ namespace NTwain
Dispatcher _dispatcher;
bool _started;
HwndSource _dummyWindow;
WindowsHook _hook;
private MessageLoop() { }
public void EnsureStarted()
public void EnsureStarted(WindowsHook.WndProcHook hook)
{
if (!_started)
{
@@ -33,14 +33,11 @@ namespace NTwain
{
Debug.WriteLine("NTwain message loop started.");
_dispatcher = Dispatcher.CurrentDispatcher;
if (Dsm.IsWin)
if (!Dsm.IsOnMono)
{
// start a windows msg loop for old twain to post msgs
// the style values are purely guesses here with
// CS_NOCLOSE, WS_DISABLED, and WS_EX_NOACTIVATE
_dummyWindow = new HwndSource(0x0200, 0x8000000, 0x8000000, 0, 0, "NTWAIN_LOOPER", IntPtr.Zero);
_hook = new WindowsHook(hook);
}
hack.Set();
hack.Set();
Dispatcher.Run();
_started = false;
}));
@@ -57,7 +54,7 @@ namespace NTwain
{
get
{
return _dummyWindow == null ? IntPtr.Zero : _dummyWindow.Handle;
return _hook == null ? IntPtr.Zero : _hook.Handle;
}
}
@@ -79,7 +76,6 @@ namespace NTwain
else
{
//_dispatcher.Invoke(DispatcherPriority.Normal, action);
// why use this instead of the single line above? for possible future use in mono!
var man = new ManualResetEvent(false);
_dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
{
@@ -96,14 +92,67 @@ namespace NTwain
man.Close();
}
}
}
public void AddHook(HwndSourceHook hook)
/// <summary>
/// Abstracts out wnd proc hook on Windows from MessageLoop class.
/// 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
{
public WindowsHook(WndProcHook hook)
{
if (_dummyWindow != null) { _dummyWindow.AddHook(hook); }
// hook into windows msg loop for old twain to post msgs.
// the style values are purely guesses here with
// 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);
}
public void RemoveHook(HwndSourceHook 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 (_dummyWindow != null) { _dummyWindow.RemoveHook(hook); }
if (_hook != null)
{
var winmsg = new MESSAGE(hwnd, msg, wParam, lParam);
_hook(ref winmsg, ref handled);
}
return IntPtr.Zero;
}
public IntPtr Handle { get; private set; }
/// <summary>
/// The MSG structure in Windows for TWAIN use.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct MESSAGE
{
public MESSAGE(IntPtr hwnd, int message, IntPtr wParam, IntPtr lParam)
{
_hwnd = hwnd;
_message = (uint)message;
_wParam = wParam;
_lParam = lParam;
_time = 0;
_x = 0;
_y = 0;
}
IntPtr _hwnd;
uint _message;
IntPtr _wParam;
IntPtr _lParam;
uint _time;
int _x;
int _y;
}
}
}

1
NTwain/Triplets/Dsm.cs
View File

@@ -32,6 +32,7 @@ namespace NTwain.Triplets
File.Exists(path);
#endif
}
internal static readonly bool IsOnMono = Type.GetType("Mono.Runtime") != null;
internal static readonly bool IsWin = Environment.OSVersion.Platform == PlatformID.Win32NT;
static readonly bool IsLinux = Environment.OSVersion.Platform == PlatformID.Unix;

52
NTwain/TwainSession.cs
View File

@@ -29,7 +29,7 @@ namespace NTwain
((ITwainStateInternal)this).ChangeState(1, false);
EnforceState = true;
MessageLoop.Instance.EnsureStarted();
MessageLoop.Instance.EnsureStarted(HandleWndProcMessage);
}
TWIdentity _appId;
@@ -369,12 +369,6 @@ namespace NTwain
}
}
if (_callbackObj == null)
{
// must use msg loop if callback is not available
MessageLoop.Instance.AddHook(HandleWndProcMessage);
}
_twui = new TWUserInterface();
_twui.ShowUI = mode == SourceEnableMode.ShowUI;
_twui.ModalUI = modal;
@@ -407,14 +401,7 @@ namespace NTwain
rc = DGControl.UserInterface.DisableDS(_twui);
if (rc == ReturnCode.Success)
{
if (_callbackObj == null)
{
MessageLoop.Instance.RemoveHook(HandleWndProcMessage);
}
else
{
_callbackObj = null;
}
_callbackObj = null;
SafeAsyncSyncableRaiseOnEvent(OnSourceDisabled, SourceDisabled);
}
});
@@ -616,19 +603,18 @@ namespace NTwain
#region TWAIN logic during xfer work
//[EnvironmentPermissionAttribute(SecurityAction.LinkDemand)]
IntPtr HandleWndProcMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
void HandleWndProcMessage(ref NTwain.WindowsHook.MESSAGE winMsg, ref bool handled)
{
// this handles the message from a typical WndProc message loop and check if it's from the TWAIN source.
if (State >= 5)
{
// transform it into a pointer for twain
var winmsg = new MESSAGE(hwnd, msg, wParam, lParam);
IntPtr msgPtr = IntPtr.Zero;
try
{
// no need to do another lock call when using marshal alloc
msgPtr = Marshal.AllocHGlobal(Marshal.SizeOf(winmsg));
Marshal.StructureToPtr(winmsg, msgPtr, false);
msgPtr = Marshal.AllocHGlobal(Marshal.SizeOf(winMsg));
Marshal.StructureToPtr(winMsg, msgPtr, false);
var evt = new TWEvent();
evt.pEvent = msgPtr;
@@ -644,8 +630,6 @@ namespace NTwain
if (msgPtr != IntPtr.Zero) { Marshal.FreeHGlobal(msgPtr); }
}
}
return IntPtr.Zero;
}
ReturnCode HandleCallback(TWIdentity origin, TWIdentity destination, DataGroups dg, DataArgumentType dat, Message msg, IntPtr data)
@@ -1223,31 +1207,5 @@ namespace NTwain
#endregion
#endregion
/// <summary>
/// The MSG structure in Windows for TWAIN use.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
struct MESSAGE
{
public MESSAGE(IntPtr hwnd, int message, IntPtr wParam, IntPtr lParam)
{
_hwnd = hwnd;
_message = (uint)message;
_wParam = wParam;
_lParam = lParam;
_time = 0;
_x = 0;
_y = 0;
}
IntPtr _hwnd;
uint _message;
IntPtr _wParam;
IntPtr _lParam;
uint _time;
int _x;
int _y;
}
}
}