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small hack to handle disablesource called from diff threads for #16

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soukoku
2014-08-31 09:01:38 -04:00
parent f073bc6b65
commit 41d821a9d5
3 changed files with 28 additions and 13 deletions
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35
NTwain/TwainSession.cs
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@@ -41,7 +41,10 @@ namespace NTwain
_appId = appId;
((ITwainSessionInternal)this).ChangeState(1, false);
#if DEBUG
// defaults to false on release since it's only useful during dev
EnforceState = true;
#endif
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1823:AvoidUnusedPrivateFields")]
@@ -434,7 +437,7 @@ namespace NTwain
_msgLoopHook.Invoke(() =>
{
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Thread {0}: EnableSource.", Thread.CurrentThread.ManagedThreadId));
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Thread {0}: EnableSource with {1}.", Thread.CurrentThread.ManagedThreadId, mode));
// app v2.2 or higher uses callback2
if (_appId.ProtocolMajor >= 2 && _appId.ProtocolMinor >= 2)
@@ -483,21 +486,32 @@ namespace NTwain
return rc;
}
bool _disabling;
ReturnCode ITwainSessionInternal.DisableSource()
{
var rc = ReturnCode.Failure;
_msgLoopHook.Invoke(() =>
if (!_disabling) // temp hack as a workaround to this being called from multiple threads (xfer logic & closedsreq msg)
{
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Thread {0}: DisableSource.", Thread.CurrentThread.ManagedThreadId));
rc = ((ITwainSessionInternal)this).DGControl.UserInterface.DisableDS(_twui);
if (rc == ReturnCode.Success)
_disabling = true;
try
{
_callbackObj = null;
SafeAsyncSyncableRaiseOnEvent(OnSourceDisabled, SourceDisabled);
_msgLoopHook.Invoke(() =>
{
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Thread {0}: DisableSource.", Thread.CurrentThread.ManagedThreadId));
rc = ((ITwainSessionInternal)this).DGControl.UserInterface.DisableDS(_twui);
if (rc == ReturnCode.Success)
{
_callbackObj = null;
SafeAsyncSyncableRaiseOnEvent(OnSourceDisabled, SourceDisabled);
}
});
}
});
finally
{
_disabling = false;
}
}
return rc;
}
@@ -788,6 +802,7 @@ namespace NTwain
break;
case Message.CloseDSReq:
case Message.CloseDSOK:
Debug.WriteLine("Got msg " + msg);
// even though it says closeDS it's really disable.
// dsok is sent if source is enabled with uionly