How to pass a Win32 struct to a C++/WinRT class

Question

How do you set up a WinRT class such that it can accept a Win32 struct as a method parameter? For example, a PROPERTYKEY struct? MIDL 3.0 won't accept that as a type, and box_value won't convert it either. Any suggestions? Thanks.

Answer 1

Hello @loop123123 , Welcome to Microsoft Q&A!

As far as I'm concerned,

1. you can define a structure or a class for the Win32 structure. Use ref const for immutable Struct only to optimize Performance, See Parameters.
2. even further, you can write an overload of the winrt::box_value function for the Win32 structure like winrt::hstring.

Thank you.

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.