zig translate-c windows.h

win.zig

const std = @import("std");
const win = std.os.windows;

// int MessageBoxA(
//  [in, optional] HWND   hWnd,
//  [in, optional] LPCSTR lpText,
//  [in, optional] LPCSTR lpCaption,
//  [in]           UINT   uType
// );
extern "user32" fn MessageBoxA(hWnd: ?win.HANDLE, lpText: ?win.LPCSTR, lpCaption: ?win.LPCSTR, uType: win.UINT) c_int;

// int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow);
pub export fn wWinMain(hInstance: ?win.HINSTANCE, hPrevInstance: ?win.HINSTANCE, lpCmdLine: ?win.LPWSTR, nShowCmd: win.INT) callconv(win.WINAPI) c_int {
    _ = hInstance; // autofix
    _ = hPrevInstance; // autofix
    _ = lpCmdLine; // autofix
    _ = nShowCmd; // autofix
    const MB_OK = 0;
    const MB_ICONINFORMATION = 0x40;
    _ = MessageBoxA(null, "Hello, World!", "Zig!", MB_OK | MB_ICONINFORMATION);
    return 0;
}

xwin-libc.txt

# The directory that contains `stdlib.h`.
include_dir=~/xwin/sdk/include/ucrt

# On Windows it's the directory that includes `vcruntime.h`.
sys_include_dir=~/xwin/crt/include

crt_dir=~/xwin/sdk/lib/ucrt/x64

# The directory that contains `vcruntime.lib`.
msvc_lib_dir=~/xwin/crt/lib/x64

# The directory that contains `kernel32.lib`.
kernel32_lib_dir=~/xwin/sdk/lib/um/x64

gcc_dir=

zig-windows.sh

# install https://rustup.rs/ 
# and https://github.com/Jake-Shadle/xwin
cargo install xwin

# download microsoft sdk in ~/xwin
xwin --accept-license --arch x86_64,aarch64 --variant desktop --sdk-version "10.0.20348" --cache-dir ~/.xwin-cache \
  splat --include-debug-libs --include-debug-symbols --preserve-ms-arch-notation --output ~/xwin

# 10.0.20348 is the latest Windows 10 SDK, after that it is Windows 11 SDK.

zig build-exe win.zig -target x86_64-windows-msvc --libc xwin-libc.txt --subsystem windows

zig build-exe main.zig -lc -target x86_64-windows-msvc --libc xwin-libc.txt --subsystem console