Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
Expand Minimize
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Compiler Warning (level 1) C4581

Error Message

deprecated behavior: '"string1"' replaced with 'string2' to process attribute

This error can be generated as a result of compiler conformance work that was done for Visual C++ 2005: parameter checking for Visual C++ attributes.

In previous versions, attribute values were accepted whether or not they were enclosed in quotation marks. If the value is an enumeration, it must not be enclosed in quotation marks.

See Breaking Changes in the Visual C++ 2005 Compiler for more information.

Example

The following sample generates C4581.

// C4581.cpp
// compile with: /c /W1
#include "unknwn.h"
[object, uuid("00000000-0000-0000-0000-000000000001")]
__interface IMyI : IUnknown {};

[coclass, uuid(12345678-1111-2222-3333-123456789012), threading("free")]   // C4581
// try the following line instead
// [coclass, uuid(12345678-1111-2222-3333-123456789012), threading(free)]
class CSample : public IMyI {};

Community Additions

ADD
Show:
© 2015 Microsoft