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Updated comments on sync context.

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soukoku 2014-05-14 19:58:45 -04:00
parent fb427437d7
commit ee2cbfa5e4
4 changed files with 28 additions and 25 deletions
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1
NTwain/Internals/TransferLogic.cs
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@ -1,6 +1,7 @@
using NTwain.Data;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;

4
NTwain/TwainSession.cs
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@ -564,6 +564,8 @@ namespace NTwain
var syncer = SynchronizationContext;
if (syncer == null)
{
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Trying to raise event {0} on thread {1} without sync.", e.GetType().Name, Thread.CurrentThread.ManagedThreadId));
try
{
onEventFunc(e);
@ -573,6 +575,8 @@ namespace NTwain
}
else
{
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Trying to raise event {0} on thread {1} with sync.", e.GetType().Name, Thread.CurrentThread.ManagedThreadId));
// on some consumer desktop scanner with poor drivers this can frequently hang. there's nothing I can do here.
syncer.Send(o =>
{
try

4
README.md
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@ -76,7 +76,9 @@ example for handling DIB image in native transfer using the CommonWin32 lib.
Because it hosts its own message thread, the events will likely be raised from another thread.
If you would like things marshalled to a UI thread then set the SynchronizationContext property
to the one from the UI thread.
to the one from the UI thread. Note that on certain consumer-grade scanner drivers this may hang the
event, so if you find yourself in that position you'll have to find another way
to synchronize data to UI threads.
```

44
Tests/Tester.Winform/TestForm.cs
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@ -61,42 +61,38 @@ namespace Tester.Winform
_twain.SynchronizationContext = SynchronizationContext.Current;
_twain.StateChanged += (s, e) =>
{
Debug.WriteLine("State change on thread " + Thread.CurrentThread.ManagedThreadId);
//this.BeginInvoke(new Action(() =>
//{
// Debug.WriteLine("State change marshaled to thread " + Thread.CurrentThread.ManagedThreadId);
//}));
Debug.WriteLine("State changed to " + _twain.State + " on thread " + Thread.CurrentThread.ManagedThreadId);
};
_twain.DataTransferred += (s, e) =>
{
//this.Invoke(new Action(() =>
//{
if (pictureBox1.Image != null)
{
pictureBox1.Image.Dispose();
pictureBox1.Image = null;
}
if (e.NativeData != IntPtr.Zero)
{
var img = e.NativeData.GetDrawingBitmap();
if (img != null)
pictureBox1.Image = img;
}
else if (!string.IsNullOrEmpty(e.FileDataPath))
{
var img = new Bitmap(e.FileDataPath);
if (pictureBox1.Image != null)
{
pictureBox1.Image.Dispose();
pictureBox1.Image = null;
}
if (e.NativeData != IntPtr.Zero)
{
var img = e.NativeData.GetDrawingBitmap();
if (img != null)
pictureBox1.Image = img;
}
}
else if (!string.IsNullOrEmpty(e.FileDataPath))
{
var img = new Bitmap(e.FileDataPath);
pictureBox1.Image = img;
}
//}));
};
_twain.SourceDisabled += (s, e) =>
{
//this.Invoke(new Action(() =>
//{
btnStopScan.Enabled = false;
btnStartCapture.Enabled = true;
panelOptions.Enabled = true;
LoadSourceCaps();
btnStopScan.Enabled = false;
btnStartCapture.Enabled = true;
panelOptions.Enabled = true;
LoadSourceCaps();
//}));
};
_twain.TransferReady += (s, e) =>