@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The CoGetInterfaceAndReleaseStream API !!!!C# Signature: [DllImport("ole32.dll")] static extern int CoGetInterfaceAndReleaseStream(IStream pStm, [In] ref Guid riid, [MarshalAs(UnmanagedType.IUnknown)] out object ppv); !!!!User-Defined Types: None. !!!!Notes: None. !!!!Tips & Tricks: In my experience, the above signature causes an internal access violation (caught before the function returns). After that, even though the function returns success (S_OK), the resulting object can *sometimes* be unusable. The exception happened every time, but the unusable result was intermittent. Suggested fix: Instead of [MarshalAs(UnmanagedType.IUnknown)] out object ppv Use [Out] out System.IntPtr ppv Then, call the function like this: IntPtr unk = 0; try{ Marshal.ThrowExceptionForHR(CoGetInterfaceAndReleaseStream(pStm, riid, out unk)); object ppv = Marshal.GetObjectForIUnknown(unk); } finally{ Marshal.Release(unk); } !!!!Sample Code: Please add some! !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: CoGetInterfaceAndReleaseStream@msdn on MSDN
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