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Added winform/wpf reg methods

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This commit is contained in:
Eugene Wang
2023-04-02 21:45:48 -04:00
parent 16aaf25f10
commit 84251a6a5e
3 changed files with 49 additions and 9 deletions
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2
src/NTwain/TwainSession.Sources.cs
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@@ -67,7 +67,7 @@ namespace NTwain
/// <returns></returns>
public STS SetDefaultSource(TW_IDENTITY_LEGACY source)
{
// TODO: this doesn't work???
// this doesn't work on windows legacy twain_32.dll
var rc = DGControl.Identity.Set(ref _appIdentity, ref source);
if (rc == STS.SUCCESS)

49
src/NTwain/TwainSession.Windows.cs
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@@ -7,6 +7,8 @@ using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
using System.Windows.Interop;
using MSG = NTwain.Data.MSG;
namespace NTwain
{
@@ -15,14 +17,53 @@ namespace NTwain
partial class TwainSession : IMessageFilter
{
// winform use with Application.AddMessageFilter(<TwainSession instance>)
private HwndSource? _wpfhook;
/// <summary>
/// Registers this session for use in a Winform UI thread.
/// </summary>
public void AddWinformFilter()
{
Application.AddMessageFilter(this);
}
/// <summary>
/// Unregisters this session if previously registered with <see cref="AddWinformFilter"/>.
/// </summary>
public void RemoveWinformFilter()
{
Application.RemoveMessageFilter(this);
}
/// <summary>
/// Registers this session for use in a WPF UI thread.
/// </summary>
public void AddWpfHook()
{
if (_wpfhook == null)
{
_wpfhook = HwndSource.FromHwnd(_hwnd);
_wpfhook.AddHook(WpfHook);
}
}
/// <summary>
/// Unregisters this session if previously registered with <see cref="AddWpfHook"/>.
/// </summary>
public void RemoveWpfHook()
{
if (_wpfhook != null)
{
_wpfhook.RemoveHook(WpfHook);
_wpfhook = null;
}
}
bool System.Windows.Forms.IMessageFilter.PreFilterMessage(ref System.Windows.Forms.Message m)
{
return CheckIfTwainMessage(m.HWnd, m.Msg, m.WParam, m.LParam);
}
// wpf use
IntPtr HwndSourceHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
// wpf use with HwndSource.FromHwnd(Handle).AddHook(
IntPtr WpfHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
handled = CheckIfTwainMessage(hwnd, msg, wParam, lParam);
return IntPtr.Zero;
@@ -32,7 +73,7 @@ namespace NTwain
{
// this handles the message from a typical WndProc message loop and check if it's from the TWAIN source.
bool handled = false;
if (_state >= Data.STATE.S5)
if (_state >= STATE.S5)
{
TW_EVENT evt = default;
try