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Another attempt to hide internal window.

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This commit is contained in:
Eugene Wang
2026-01-01 21:40:38 -05:00
parent f282108f66
commit 5643e1de99
3 changed files with 16 additions and 17 deletions
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2
src/Directory.Build.props
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@@ -2,7 +2,7 @@
<PropertyGroup>
<!--change these in each release-->
<VersionPrefix>4.0.0.0</VersionPrefix>
<VersionSuffix>alpha.30</VersionSuffix>
<VersionSuffix>alpha.31</VersionSuffix>
<!--keep it the same until major # changes-->
<AssemblyVersion>4.0.0.0</AssemblyVersion>

29
src/NTwain/MessagePumpThread.cs
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@@ -2,8 +2,7 @@
using Microsoft.Extensions.Logging;
using NTwain.Data;
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
@@ -15,7 +14,7 @@ namespace NTwain
/// </summary>
class MessagePumpThread
{
DummyForm? _dummyForm;
KeepAliveForm? _dummyForm;
TwainAppSession? _twain;
public bool IsRunning => _dummyForm != null && _dummyForm.IsHandleCreated;
@@ -106,7 +105,7 @@ namespace NTwain
_twain?.Logger.LogDebug("Starting TWAIN message pump thread.");
Application.ThreadException += Application_ThreadException;
Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
_dummyForm = new DummyForm();
_dummyForm = new KeepAliveForm();
_dummyForm.FormClosed += (s, e) =>
{
_dummyForm = null;
@@ -120,20 +119,20 @@ namespace NTwain
_twain?.Logger.LogError(e.Exception, "Unhandled exception in TWAIN message pump thread.");
}
class DummyForm : Form
class KeepAliveForm : Form
{
public DummyForm()
public KeepAliveForm()
{
ShowInTaskbar = false;
Width = 1;
Height = 1;
//WindowState = FormWindowState.Minimized;
Text = "NTwain Internal Loop";
}
[DllImport("user32.dll")]
static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
SetParent(this.Handle, new IntPtr(-3)); // HWND_MESSAGE
}
//protected override CreateParams CreateParams
@@ -146,11 +145,11 @@ namespace NTwain
// }
//}
protected override void OnShown(EventArgs e)
{
Hide();
base.OnShown(e);
}
//protected override void OnShown(EventArgs e)
//{
// Hide();
// base.OnShown(e);
//}
bool _closeForReal = false;
internal void Close(bool forReal)

2
src/NTwain/NativeMethods.txt
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@@ -5,4 +5,4 @@ GlobalLock
GlobalUnlock
BITMAPINFOHEADER
BITMAPINFO
BITMAPFILEHEADER
BITMAPFILEHEADER