Hi,
I have a c# class which is a wrapper around the WMF (Windows Media Format)
SDK.
One of the classes, which wraps the IWMMetadataEditor interface roughly
looks like this:
namespace WMFSDKWrapper
{
public class MetadataEditor : IDisposable, IEnumerable
{
bool isDisposed = false;
private IWMMetadataEditor editor;
...
public void Flush()
{ editor.Flush(); }
private void Dispose(bool disposing)
{
if (!isDisposed)
{
if (disposing)
; // No managed resources to clear up...
// Clear up unmanaged resources
Flush();
}
isDisposed = true;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
~MetadataEditor()
{ Dispose(false); }
}
}
Now, the wrapper (which obviously has more code) works perfectly.
I can change a WM file's metadata or query it as I wish.
I can call the Flush(), Close() or even Dispose() method directly and they
all work fine...
i.e.: If I call the Dispose() method "manually" I get:
IronPython 1.0.2281 (Beta) on .NET 2.0.50727.42
Copyright (c) Microsoft Corporation. All rights reserved.
>>> import wmf
>>> m = wmf.MetadataEditor("a.wma")
>>> m[wmf.MediaMetadata.Title]
'123'
>>> m.Dispose()
>>> ^Z
(IronPythonConsole.exe exits cleanly)
The problem I'm getting is that if exit the IronPython console without
calling the object's Dispose method beforehand I get
Something like this, regardless of what I did with the COM object (i.e.,
read-only or read-write):
IronPython 1.0.2281 (Beta) on .NET 2.0.50727.42
Copyright (c) Microsoft Corporation. All rights reserved.
>>> import wmf
>>> m = wmf.MetadataEditor("a.wma")
>>> m[wmf.MediaMetadata.Title]
'123'
>>> ^Z
Unhandled exception:
Traceback (most recent call last):
File WMFSDKWrapper, line unknown, in Finalize
File WMFSDKWrapper, line unknown, in Dispose
File WMFSDKWrapper, line unknown, in Flush
File WMFSDKWrapper, line unknown, in Flush
TypeError: Unable to cast COM object of type 'System.__ComObject' to
interface type 'WMFSDKWrapper.IWMMetadataEditor'. T
his operation failed because the QueryInterface call on the COM component
for the interface with IID '{96406BD9-2B2B-11D
3-B36B-00C04F6108FF}' failed due to the following error: No such interface
supported (Exception from HRESULT: 0x80004002
(E_NOINTERFACE)).
Unhandled Exception: System.InvalidCastException: Unable to cast COM object
of type 'System.__ComObject' to interface ty
pe 'WMFSDKWrapper.IWMMetadataEditor'. This operation failed because the
QueryInterface call on the COM component for the
interface with IID '{96406BD9-2B2B-11D3-B36B-00C04F6108FF}' failed due to
the following error: No such interface suppor
ted (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
at WMFSDKWrapper.IWMMetadataEditor.Flush()
at WMFSDKWrapper.MetadataEditor.Flush()
at WMFSDKWrapper.MetadataEditor.Dispose(Boolean disposing)
at WMFSDKWrapper.MetadataEditor.Finalize()
Any ideas?
Shechter.
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