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Tweak internal message pump form to be hidden.

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This commit is contained in:
Eugene Wang
2025-12-12 07:58:34 -05:00
parent 8d4e3a2708
commit 77dd5eef3b
2 changed files with 114 additions and 103 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.21</VersionSuffix>
<VersionSuffix>alpha.22</VersionSuffix>
<!--keep it the same until major # changes-->
<AssemblyVersion>4.0.0.0</AssemblyVersion>

215
src/NTwain/MessagePumpThread.cs
View File

@@ -8,123 +8,134 @@ using System.Windows.Forms;
namespace NTwain
{
/// <summary>
/// For use under Windows to host a message pump.
/// </summary>
class MessagePumpThread
{
DummyForm? _dummyForm;
TwainAppSession? _twain;
public bool IsRunning => _dummyForm != null && _dummyForm.IsHandleCreated;
/// <summary>
/// Starts the thread, attaches a twain session to it,
/// and opens the DSM.
/// For use under Windows to host a message pump.
/// </summary>
/// <param name="twain"></param>
/// <returns></returns>
/// <exception cref="InvalidOperationException"></exception>
public async Task<STS> AttachAsync(TwainAppSession twain)
class MessagePumpThread
{
if (twain.State > STATE.S2) throw new InvalidOperationException("Cannot attach to an opened TWAIN session.");
if (_twain != null || _dummyForm != null) throw new InvalidOperationException("Already attached previously.");
DummyForm? _dummyForm;
TwainAppSession? _twain;
Thread t = new(RunMessagePump);
t.IsBackground = true;
t.SetApartmentState(ApartmentState.STA);
t.Start();
public bool IsRunning => _dummyForm != null && _dummyForm.IsHandleCreated;
while (_dummyForm == null || !_dummyForm.IsHandleCreated)
{
await Task.Delay(50);
}
STS sts = default;
TaskCompletionSource<bool> tcs = new();
_dummyForm.BeginInvoke(() =>
{
try
/// <summary>
/// Starts the thread, attaches a twain session to it,
/// and opens the DSM.
/// </summary>
/// <param name="twain"></param>
/// <returns></returns>
/// <exception cref="InvalidOperationException"></exception>
public async Task<STS> AttachAsync(TwainAppSession twain)
{
sts = twain.OpenDSM(_dummyForm.Handle, SynchronizationContext.Current!);
if (sts.IsSuccess)
{
twain.AddWinformFilter();
_twain = twain;
}
else
{
_dummyForm.Close();
}
if (twain.State > STATE.S2) throw new InvalidOperationException("Cannot attach to an opened TWAIN session.");
if (_twain != null || _dummyForm != null) throw new InvalidOperationException("Already attached previously.");
Thread t = new(RunMessagePump);
t.IsBackground = true;
t.SetApartmentState(ApartmentState.STA);
t.Start();
while (_dummyForm == null || !_dummyForm.IsHandleCreated)
{
await Task.Delay(50);
}
STS sts = default;
TaskCompletionSource<bool> tcs = new();
_dummyForm.BeginInvoke(() =>
{
try
{
sts = twain.OpenDSM(_dummyForm.Handle, SynchronizationContext.Current!);
if (sts.IsSuccess)
{
twain.AddWinformFilter();
_twain = twain;
}
else
{
_dummyForm.Close();
}
}
finally
{
tcs.TrySetResult(true);
}
});
await tcs.Task;
return sts;
}
finally
/// <summary>
/// Detatches a previously attached session and stops the thread.
/// </summary>
public async Task<STS> DetachAsync()
{
tcs.TrySetResult(true);
STS sts = default;
if (_dummyForm != null && _twain != null)
{
TaskCompletionSource<STS> tcs = new();
_dummyForm.BeginInvoke(() =>
{
sts = _twain.CloseDSMReal();
if (sts.IsSuccess)
{
_twain.RemoveWinformFilter();
_dummyForm.Close();
_twain = null;
}
tcs.SetResult(sts);
});
await tcs.Task;
}
return sts;
}
});
await tcs.Task;
return sts;
}
/// <summary>
/// Detatches a previously attached session and stops the thread.
/// </summary>
public async Task<STS> DetachAsync()
{
STS sts = default;
if (_dummyForm != null && _twain != null)
{
TaskCompletionSource<STS> tcs = new();
_dummyForm.BeginInvoke(() =>
public void BringWindowToFront()
{
sts = _twain.CloseDSMReal();
if (sts.IsSuccess)
{
_twain.RemoveWinformFilter();
_dummyForm.Close();
_twain = null;
}
tcs.SetResult(sts);
});
await tcs.Task;
}
return sts;
}
if (_dummyForm != null)
{
_dummyForm.BeginInvoke(_dummyForm.BringToFront);
}
}
public void BringWindowToFront()
{
if (_dummyForm != null)
{
_dummyForm.BeginInvoke(_dummyForm.BringToFront);
}
}
void RunMessagePump()
{
Debug.WriteLine("TWAIN pump thread starting");
_dummyForm = new DummyForm();
_dummyForm.FormClosed += (s, e) =>
{
_dummyForm = null;
};
Application.Run(_dummyForm);
Debug.WriteLine("TWAIN pump thread ended");
}
void RunMessagePump()
{
Debug.WriteLine("TWAIN pump thread starting");
_dummyForm = new DummyForm();
_dummyForm.FormClosed += (s, e) =>
{
_dummyForm = null;
};
Application.Run(_dummyForm);
Debug.WriteLine("TWAIN pump thread ended");
}
class DummyForm : Form
{
public DummyForm()
{
ShowInTaskbar = false;
WindowState = FormWindowState.Minimized;
Text = "NTwain Internal Loop";
}
class DummyForm : Form
{
public DummyForm()
{
ShowInTaskbar = false;
WindowState = FormWindowState.Minimized;
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x80; // WS_EX_TOOLWINDOW
return cp;
}
}
protected override void OnShown(EventArgs e)
{
BringToFront();
base.OnShown(e);
}
protected override void OnShown(EventArgs e)
{
BringToFront();
base.OnShown(e);
}
}
}
}
}
#endif