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Updated winform sample with sync context usage.

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soukoku
2015-02-13 07:05:37 -05:00
parent c3cd46e543
commit 0f4e258970
1 changed files with 44 additions and 42 deletions
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86
Tests/Tester.Winform/TestForm.cs
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@@ -39,6 +39,13 @@ namespace Tester.Winform
}
}
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
SetupTwain();
}
protected override void OnFormClosing(FormClosingEventArgs e)
{
if (_twain != null)
@@ -59,16 +66,13 @@ namespace Tester.Winform
{
var appId = TWIdentity.CreateFromAssembly(DataGroups.Image, Assembly.GetEntryAssembly());
_twain = new TwainSession(appId);
// either set this and don't worry about threads during events,
// or don't and invoke during the events yourself
//_twain.SynchronizationContext = SynchronizationContext.Current;
_twain.StateChanged += (s, e) =>
{
Debug.WriteLine("State changed to " + _twain.State + " on thread " + Thread.CurrentThread.ManagedThreadId);
};
_twain.DataTransferred += (s, e) =>
{
Debug.WriteLine("Transferred data.");
Debug.WriteLine("Transferred data event on thread " + Thread.CurrentThread.ManagedThreadId);
// example on getting ext image info
var infos = e.GetExtImageInfo(ExtendedImageInfo.Camera).Where(it => it.ReturnCode == ReturnCode.Success);
@@ -104,6 +108,7 @@ namespace Tester.Winform
};
_twain.SourceDisabled += (s, e) =>
{
Debug.WriteLine("Source disabled event on thread " + Thread.CurrentThread.ManagedThreadId);
this.BeginInvoke(new Action(() =>
{
btnStopScan.Enabled = false;
@@ -114,8 +119,21 @@ namespace Tester.Winform
};
_twain.TransferReady += (s, e) =>
{
Debug.WriteLine("Transferr ready event on thread " + Thread.CurrentThread.ManagedThreadId);
e.CancelAll = _stopScan;
};
// either set sync context and don't worry about threads during events,
// or don't and use control.invoke during the events yourself
Debug.WriteLine("Setup thread = " + Thread.CurrentThread.ManagedThreadId);
_twain.SynchronizationContext = SynchronizationContext.Current;
if (_twain.State < 3)
{
// use this for internal msg loop
_twain.Open();
// use this to hook into current app loop
//_twain.Open(new WindowsFormsMessageLoopHook(this.Handle));
}
}
private void CleanupTwain()
@@ -153,6 +171,27 @@ namespace Tester.Winform
ReloadSourceList();
}
private void ReloadSourceList()
{
if (_twain.State >= 3)
{
while (btnSources.DropDownItems.IndexOf(sepSourceList) > 0)
{
var first = btnSources.DropDownItems[0];
first.Click -= SourceMenuItem_Click;
btnSources.DropDownItems.Remove(first);
}
foreach (var src in _twain)
{
var srcBtn = new ToolStripMenuItem(src.Name);
srcBtn.Tag = src;
srcBtn.Click += SourceMenuItem_Click;
srcBtn.Checked = _twain.CurrentSource != null && _twain.CurrentSource.Name == src.Name;
btnSources.DropDownItems.Insert(0, srcBtn);
}
}
}
void SourceMenuItem_Click(object sender, EventArgs e)
{
// do nothing if source is enabled
@@ -244,44 +283,9 @@ namespace Tester.Winform
}
}
}
#endregion
#region real work
private void ReloadSourceList()
{
if (_twain == null)
{
SetupTwain();
}
if (_twain.State < 3)
{
// use this for internal msg loop
_twain.Open();
// use this to hook into current app loop
//_twain.Open(new WindowsFormsMessageLoopHook(this.Handle));
}
if (_twain.State >= 3)
{
while (btnSources.DropDownItems.IndexOf(sepSourceList) > 0)
{
var first = btnSources.DropDownItems[0];
first.Click -= SourceMenuItem_Click;
btnSources.DropDownItems.Remove(first);
}
foreach (var src in _twain)
{
var srcBtn = new ToolStripMenuItem(src.Name);
srcBtn.Tag = src;
srcBtn.Click += SourceMenuItem_Click;
srcBtn.Checked = _twain.CurrentSource != null && _twain.CurrentSource.Name == src.Name;
btnSources.DropDownItems.Insert(0, srcBtn);
}
}
}
#region cap control
@@ -405,7 +409,5 @@ namespace Tester.Winform
#endregion
#endregion
}
}