BUG: OLE 2.0 Compatibility Layer Uses Document IDataObject

ID: Q111585

The information in this article applies to:

Microsoft OLE Libraries for Windows and Win32s, version 2.01

Microsoft OLE Libraries, included with:

    - Microsoft Windows NT, versions 3.5 and 3.51
    - Microsoft Windows 95

SYMPTOMS

Whenever the OLE 1.0 client compatibility layer uses IDataObject, it uses the OLE 2.0 server's document-level data object rather than the server's pseudo-object data object.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

One of the side-effects of this problem is that the following key is required in the OLE 2.0 server application's CLSID listing in the registration database

   GetSet
      |- X = 3, 1, 32, 1

where X is application-dependent. If this key is missing from the registration database, then any attempt to embed the OLE 2.0 object into an OLE 1.0 client will fail, even if the server application fully supports IDataObject::EnumFormatEtc.

The GetSet key is used by server applications to describe the formats that an object is capable of rendering, or having set. OLE looks at this key when it needs to know which formats an object supports, without having to run the object. This key is required in this situation because the OLE 1.0 compatibility layer is always going to refer to the registration database to enumerate the formats supported by the server application. This particular key represents the METAFILEPICT format, which must be supported for OLE 1.0 compatibility.

Additional reference words: 2.01 3.50 4.00 toolkit KBCategory: kbole kbbuglist KBSubcategory: LeTwoPrs

Last Reviewed: May 17, 1995