Interestingly, Windows has its own object-oriented API/ABI with COM (and later WinRT, which builds on COM). However, the MIDL compiler for COM interfaces produc

Interestingly, Windows has its own object-oriented API/ABI with COM (and later WinRT, which builds on COM). However, the MIDL compiler for COM interfaces produces headers that are consumable from C, both to use interfaces and to implement them: https://www.codeproject.com/KB/com/com_in_c1.aspx https://www.codeproject.com/KB/com/com_in_c1.aspx As far as I know, this still works today even for WinRT, although the generated C struct and function names get very ugly because they have to include the entire namespace: https://stackoverflow.com/a/7437006/111335 https://stackoverflow.com/a/7437006/111335