How can I use SetWindowsHookEx with ffi in flutter?

Question

I want to listen keyboard events use windows hook, we can do it with SetWindowsHookEx use MethodChannel, but I want to do this with dart code use ffi, I write some code but it doesn't work in flutter, I can't receive any message from windows after I called SetWindowsHookEx, here is some of my dart code:

final _kernel32 = DynamicLibrary.open('kernel32.dll');
final _user32 = DynamicLibrary.open('user32.dll');

late final HHOOK _hhk;

int hookproc(int code, int wParam, int lParam) {
  return _CallNextHookEx(_hhk, nCode, wParam, lParam);
}

void setWindowsHook() {
    const idHook = WH_KEYBOARD_LL;
    final lpfn = Pointer.fromFunction<LRESULT Function(Int32, WPARAM, LPARAM)>(
      hookproc,
      0,
    );
    final hmod = _GetModuleHandleW(nullptr);
    const dwThreadId = 0;
    _hhk = _SetWindowsHookExW(idHook, lpfn, nullptr, dwThreadId);
}

late final _GetModuleHandleW = _kernel32
    .lookup<NativeFunction<HMODULE Function(LPCWSTR)>>('GetModuleHandleW')
    .asFunction<HMODULE Function(LPCWSTR)>();

late final _SetWindowsHookExW = _user32
    .lookup<NativeFunction<HHOOK Function(Int32, HOOKPROC, HINSTANCE, DWORD)>>(
        'SetWindowsHookExW')
    .asFunction<HHOOK Function(int, HOOKPROC, HINSTANCE, int)>();

late final _CallNextHookEx = _user32
    .lookup<NativeFunction<LRESULT Function(HHOOK, Int32, WPARAM, LPARAM)>>(
        'CallNextHookEx')
    .asFunction<int Function(HHOOK, int, int, int)>();

late final _UnhookWindowsHookEx = _user32
    .lookup<NativeFunction<BOOL Function(HHOOK)>>('UnhookWindowsHookEx')
    .asFunction<int Function(HHOOK)>();

Does anybody know how to solve this?