Strong/Weak Marshaling of Proxies Is Not Supported

 Last reviewed: March 14, 1996
Article ID: Q148374
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

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Last reviewed: March 14, 1996
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