Blog Entry

在Windows下使用Zig编译dll

Created: 2023/09/08
Updated: 2023/09/08

环境

❯ zig version
0.12.0-dev.286+b0d9bb0bb

dll

新建项目

mkdir dll
cd dll
zig init-lib

核心代码

// To compile this, you could use this command " zig build-lib -lc -dynamic -fstrip -O ReleaseSmall src/main.zig"

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

// Types
const WINAPI = win.WINAPI;
const HINSTANCE = win.HINSTANCE;
const DWORD = win.DWORD;
const LPVOID = win.LPVOID;
const BOOL = win.BOOL;
const HWND = win.HWND;
const LPCSTR = win.LPCSTR;
const UINT = win.UINT;

// fdwReason parameter values
const DLL_PROCESS_ATTACH: DWORD = 1;
const DLL_THREAD_ATTACH: DWORD = 2;
const DLL_THREAD_DETACH: DWORD = 3;
const DLL_PROCESS_DETACH: DWORD = 0;

extern "user32" fn MessageBoxA(hWnd: ?HWND, lpText: LPCSTR, lpCaption: LPCSTR, uType: UINT) callconv(WINAPI) i32;

pub export fn _DllMainCRTStartup(hinstDLL: HINSTANCE, fdwReason: DWORD, lpReserved: LPVOID) BOOL {
    _ = lpReserved;
    _ = hinstDLL;
    switch (fdwReason) {
        DLL_PROCESS_ATTACH => {
            _ = MessageBoxA(null, "Hello World!", "Zig", 0);
        },
        DLL_THREAD_ATTACH => {},
        DLL_THREAD_DETACH => {},
        DLL_PROCESS_DETACH => {},
        else => {},
    }
    return 1;
}

如果Dll被加载，就会弹个框。

编译

zig build-lib -lc -dynamic -fstrip -O ReleaseSmall src/main.zig

❯ ls main*

    目录: E:\xk\Code\xkyss\xkyss.zig\playground\v0.12\dll

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
-a----          2023/9/8     10:30          19968 main.dll
-a----          2023/9/8     10:30            950 main.dll.obj
-a----          2023/9/8     10:30           1146 main.lib

loader

新建项目

mkdir loader
cd loader
zig init-exe

核心代码

const std = @import("std");

pub fn main() !void {
    const dllpath =
        // 绝对路径
        // \\E:\xk\Code\xkyss\xkyss.zig\playground\v0.12\dll\main.dll
        // 相对路径
        \\../dll/main.dll
    ;
    std.debug.print("Dll Path: {s}\n", .{dllpath});

    // 加载dll
    _ = try std.DynLib.open(dllpath);
}

运行

zig build run