FIX: #import Does not Correctly Handle GUID Parameters

ID: Q185284

The information in this article applies to:

Microsoft Visual C++, 32-bit Editions, version 5.0

SYMPTOMS

When using the #import directive on a type library with a method containing a GUID as a parameter, or methods containing a structure that contains a GUID as a parameter, you might encounter one of the following error messages:

C2664: 'Method1' : cannot convert parameter 1 from 'struct _GUID *' to 'struct GUID *'

C2664: 'raw_Method2' : cannot convert parameter 1 from 'struct GUID' to 'struct GUID'

C2079: 'm_guid' uses undefined struct 'GUID'

You might also encounter one of these error messages when you use parameters of type IID, CLSID, FMTID, UUID, CATID, and references to these types (REFGUID, REFIID, etc.).

CAUSE

The #import statement incorrectly interprets struct _GUID as struct GUID. GUID is only a typedef for struct _GUID.

RESOLUTION

Use the "rename" attribute with #import to replace the string GUID with _GUID. For example:


   #import "myproject.tlb" rename("GUID", "_GUID")

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Microsoft Visual C++, version 6.0.

REFERENCES

Additional query words: kbVC500bug kbCompiler kbCOMt kbDSupport kbdsd

Keywords : kberrmsg kbVC600fix
Version : WINNT:5.0
Platform : winnt
Issue type : kbbug