Fast and complete Win32 API bindings for Deno using FFI.

import {
  MB_OKCANCEL,
  MessageBoxA,
} from "https://win32.deno.dev/0.4.1/UI.WindowsAndMessaging";

const result = MessageBoxA(
  null,
  "Hello, world!",
  "Hello",
  MB_OKCANCEL,
); // 1 (OK) or 2 (Cancel)

More in examples/ such as demonstrating OpenGL API usage.

You need to pass --allow-ffi and --unstable flags in order to access the Win32 API.

deno run --allow-ffi --unstable <file>

Note: It is highly recommended to import only APIs you need. Do not import from mod.ts as it will import all sub modules which you might not even need. WinAPI is huge, so are the bindings.

It is recommened to read the official documentation of Win32 API.

APIs almost map 1:1 with the official ones, just certain types have to be transformed to be sent into C-land like string is first converted into null-terminated string depending on the argument (PSTR or PWSTR).

Constants are exported as-is. Structs are defined as interfaces with corresponding JS types in fields. We also export a helper function alloc${STRUCT} which accepts Partial<${STRUCT}> to create a new struct and return its buffer as Uint8Array. A constant called sizeof${camelCasedStruct} is exported which is the size of the struct in bytes.

Some APIs have been (manually) marked as Async capable which adds a ${name}Async variant of the function along with original one which runs on a different thread natively and returns a promise. If you want any other API to be Async capable, please open an issue or a PR. Note that Async calls cannot go through v8 fastapi path, so they have more overhead than normal ones.

Code is formatted using deno fmt and linted using deno lint. Please make sure to run these commands before committing.

Apache-2.0. Check LICENSE for more details.

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