Strong/Weak Marshaling of Proxies Is Not Supported

ID: Q148374

3.51       | 4.00

The information in this article applies to:

• Microsoft OLE libraries included with:

      - Microsoft Windows NT version 3.51
      - Microsoft Windows 95
  

SUMMARY

Marshaling a proxy of an interface belonging to another thread or process is supported with MSHLFLAGS_NORMAL, but it is not supported with MSHLFLAGS_TABLESTRONG or MSHLFLAGS_TABLEWEAK. This means that CoMarshalInterface with MSHLFLAGS_TABLESTRONG/MSHLFLAGS_TABLEWEAK and IRunningObjectTable::Register will return E_INVALIDARG for proxies.

MORE INFORMATION

When an interface is marshaled to another thread or process, a proxy of the interface is created in that thread or process. This proxy cannot be marshaled again using the MSHLFLAGS_TABLESTRONG or MSHLFLAGS_TABLEWEAK values of the MSHLFLAGS enumerator. However it can be marshaled using MSHLFLAGS_NORMAL. Marshaling of interfaces that are not proxies are supported using any of the MSHLFLAGS enumerator values.

IRunningObjectTable::Register will marshal the interface pointer given to it by using MSHLFLAGS_TABLESTRONG or MSHLFLAGS_TABLEWEAK, as specified by the grfFlags parameter. Consequently IRunningObjectTable::Register will fail with E_INVALIDARG if is asked to register a proxy.

Windows 3.x supported marshaling of proxies using MSHLFLAGS_TABLESTRONG and MSHLFLAGS_TABLEWEAK. This is not supported on Windows 95 or Windows NT.

Additional reference words: 2 OLE2 2.0 2.00 KBCategory: kbprg KBSubcategory: LeTwoArc

Keywords          : LeTwoArc 
Version           : 3.51       | 4.00
Platform          : NT WINDOWS

Last Reviewed: March 15, 1996