Making Win32 APIs More Accessible to More Languages

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  • win32metadata

    Tooling to generate metadata for Win32 APIs in the Windows SDK.

  • Interesting. The real thing here is the Win32 Metadata project:

    It contains definitions that can be used to automatically generate bindings to any language. So, we have C# and Rust as examples, but the very same definitions could be used with languages like Zig.

    Very cool initiative.

  • go

    The Go programming language

  • Golang is also considering consuming this new metadata:

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  • sokol-zig

    Zig bindings for the sokol headers (

  • I'm tackling this issue from two sides:

    (1) Change the C-API to make it more "binding-generator-friendly", for instance by adding a range/slice-struct to th C-API which bundles a pointer and associated size, or specially named typedefs that only exist to give the binding generator hints for special case handling.

    (2) Make the bindings-generator configurable on a per-language and per-API basis, this can be as simple as a map which overrides type- and function-names, or injects manually written code into the generated bindings.

    The goal is to make the generated bindings more idiomatic to the target language.

    This mostly works if you have control over the underlying C-API of course, e.g. the language bindings are created by the original C-library project, not as an external project to convert a fixed C-API.

    I wrote a blog post about this whole topic:

    ...and here's an example of one such semi-auto-generated Zig bindings, note the two "injected" helper functions at the top:

    ...for instance note the "injected" helper functions here:

  • sokol-samples

    Sample code for

  • C99 has made all that a lot easier, you can setup, initialize a struct and call the function taking a pointer to that struct all in one call:

    The Win32 window system functions and D3D11 are actually very convenient to work with in C99, better than C++ actually.

  • JNA

    Java Native Access

  • I was the de facto maintainer of JNA ( win32 bindings for years. The API metadata is welcome - we have always based all work on header files in the visual studio / windows SDK. Now there’s a change to generate that code - someone might want to try to replace hand crafted mappings in JNA with generated ones - there’s a huge test suite to work with.

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