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Changed when callbacks are registered.

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This commit is contained in:
soukoku 2015-01-08 07:05:22 -05:00
parent 1ce7c5caf5
commit 8d30e9066f
3 changed files with 46 additions and 40 deletions
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2
NTwain/DataSource.cs
View File

@ -38,6 +38,7 @@ namespace NTwain
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Thread {0}: OpenSource.", Thread.CurrentThread.ManagedThreadId));
rc = _session.DGControl.Identity.OpenDS(this);
_session.UpdateCallback();
});
return rc;
}
@ -58,6 +59,7 @@ namespace NTwain
{
SupportedCaps = null;
}
_session.UpdateCallback();
});
return rc;
}

2
NTwain/Internals/ITwainSessionInternal.cs
View File

@ -36,6 +36,8 @@ namespace NTwain.Internals
void ChangeCurrentSource(DataSource source);
void UpdateCallback();
ReturnCode DisableSource();
void SafeSyncableRaiseEvent(DataTransferredEventArgs e);

82
NTwain/TwainSessionInternal.cs
View File

@ -27,6 +27,44 @@ namespace NTwain
/// <value>The app id.</value>
TWIdentity ITwainSessionInternal.AppId { get { return _appId; } }
void ITwainSessionInternal.UpdateCallback()
{
if (State < 4)
{
_callbackObj = null;
}
else
{
ReturnCode rc = ReturnCode.Failure;
// per the spec (8-10) apps for 2.2 or higher uses callback2 so try this first
if (_appId.ProtocolMajor > 2 || (_appId.ProtocolMajor >= 2 && _appId.ProtocolMinor >= 2))
{
var cb = new TWCallback2(HandleCallback);
rc = ((ITwainSessionInternal)this).DGControl.Callback2.RegisterCallback(cb);
if (rc == ReturnCode.Success)
{
Debug.WriteLine("Registered callback2 OK.");
_callbackObj = cb;
}
}
if (rc != ReturnCode.Success)
{
// always try old callback
var cb = new TWCallback(HandleCallback);
rc = ((ITwainSessionInternal)this).DGControl.Callback.RegisterCallback(cb);
if (rc == ReturnCode.Success)
{
Debug.WriteLine("Registered callback OK.");
_callbackObj = cb;
}
}
}
}
void ITwainSessionInternal.ChangeState(int newState, bool notifyChange)
{
_state = newState;
@ -122,54 +160,19 @@ namespace NTwain
{
Debug.WriteLine(string.Format(CultureInfo.InvariantCulture, "Thread {0}: EnableSource with {1}.", Thread.CurrentThread.ManagedThreadId, mode));
// per the spec (8-10) app v2.2 or higher uses callback2
if (_appId.ProtocolMajor > 2 || (_appId.ProtocolMajor >= 2 && _appId.ProtocolMinor >= 2))
{
var cb = new TWCallback2(HandleCallback);
var rc2 = ((ITwainSessionInternal)this).DGControl.Callback2.RegisterCallback(cb);
if (rc2 == ReturnCode.Success)
{
Debug.WriteLine("Registered callback2 OK.");
_callbackObj = cb;
}
}
else
{
// all else try old callback
var cb = new TWCallback(HandleCallback);
var rc2 = ((ITwainSessionInternal)this).DGControl.Callback.RegisterCallback(cb);
if (rc2 == ReturnCode.Success)
{
Debug.WriteLine("Registered callback OK.");
_callbackObj = cb;
}
}
_twui = new TWUserInterface();
_twui.ShowUI = mode == SourceEnableMode.ShowUI;
_twui.ModalUI = modal;
_twui.hParent = windowHandle;
try
if (mode == SourceEnableMode.ShowUIOnly)
{
if (mode == SourceEnableMode.ShowUIOnly)
{
rc = ((ITwainSessionInternal)this).DGControl.UserInterface.EnableDSUIOnly(_twui);
}
else
{
rc = ((ITwainSessionInternal)this).DGControl.UserInterface.EnableDS(_twui);
}
rc = ((ITwainSessionInternal)this).DGControl.UserInterface.EnableDSUIOnly(_twui);
}
finally
else
{
if (rc != ReturnCode.Success)
{
_callbackObj = null;
}
rc = ((ITwainSessionInternal)this).DGControl.UserInterface.EnableDS(_twui);
}
});
return rc;
@ -191,7 +194,6 @@ namespace NTwain
rc = ((ITwainSessionInternal)this).DGControl.UserInterface.DisableDS(_twui);
if (rc == ReturnCode.Success)
{
_callbackObj = null;
SafeAsyncSyncableRaiseOnEvent(OnSourceDisabled, SourceDisabled);
}
});