Functions missing the ComOutPtr attribute

[kennykerr]

The CoGetObjectContext example is a bug in the Win32 metadata. It is lacking the ComOutPtr attribute on the trailing void** parameter. For example, the metadata for CoCreateInstance is as follows:

public unsafe static extern HRESULT CoCreateInstance([In][Const] Guid* rclsid, [Optional][In] IUnknown pUnkOuter, [In] CLSCTX dwClsContext, [In][Const] Guid* riid, [Out][ComOutPtr] void** ppv);

But CoGetObjectContext is missing the ComOutPtr attribute:

public unsafe static extern HRESULT CoGetObjectContext([In][Const] Guid* riid, [Out] void** ppv);

At a glance, the following functions from the Windows.Win32.System.Com namespace are missing the ComOutPtr attribute:

CreateDataCache
BindMoniker
CoGetObject
CoGetObjectContext
CoGetClassObject
CoGetCallContext
CoGetCancelObject

I'll open an issue for these.

For the rest of the discussion, I agree that https://stackoverflow.com/ is a more appropriate platform.

Originally posted by @kennykerr in microsoft/windows-rs#2276 (comment)