C2337 'importidl': 将解决方案升级到 VS2019 ( 16.9.2 ) 后找不到属性错误

Question

I am updating a project to compile with VS2019 and turns out that importidl is no longer supported in VS2019 ( 16.9.2 ). Comparing the generated.tlb prior to updating to VS2019 and after the binary file is much smaller resulting in a broken COM interface.

The error I am getting is C2337 'importidl':attribute not found .

The importidl is surrounded by a warning suppression:

#pragma warning(disable: 4467)
[ importidl(COM\\dummy.idl) ];
#pragma warning(pop)

C4467: usage of ATL attribute is deprecated

The Microsoft documentation leads to believe that imporidl had not been deprecated or removed. However, it has been last updated 2 years ago and the warnings and errors are leading me to believe that there is a discrepancy on the documentation.

What is the alternative to go around the removed importidl ?

Answer 1

In order to fix this issue with VS2019, I added a /permissive flag to the command line option. Setting the conformance mode to "No" along with the std:c++latest did not work. std:c++latest is probably overriding /permissive .

Keeping the conformance mode to Default , with the latest /std:c++latest language standard and adding /permissive as an additional Options to the command line property goes around the error C2017 Importidl attribute not found .