Windows DwmGetWindowAttribute function

[genesisneo]

Hi, I hope everyone fine and well.
I am new to ffi and I have a small project using electron and that can move Windows current active window.
I am planning to use the same solution from StackOverflow and I manage to do the GetWindowRect, however, I can't find a solution to do the DwmGetWindowAttribute. Below is my code to the said project.

...
// user32 functions
const user32 = new ffi.Library('user32', {
  'GetForegroundWindow': ['long', []],
  'ShowWindow': ['bool', ['long', 'int']],
  'GetWindowRect': ['bool', ['long', 'pointer']],
  'SetWindowPos': ['bool', ['long', 'long', 'int', 'int', 'int', 'int', 'uint']]
});

// dwmapi functions
const dwmapi = new ffi.Library('dwmapi', {
  'DwmGetWindowAttribute': ['bool', ['long', 'long', 'pointer', 'long']]
});

// create rectangle from pointer
const pointerToRect = function (rectPointer) {
  const rect = {};
  rect.left = rectPointer.readInt16LE(0);
  rect.top = rectPointer.readInt16LE(4);
  rect.right = rectPointer.readInt16LE(8);
  rect.bottom = rectPointer.readInt16LE(12);
  return rect;
}

// obtain window dimension
const getWindowDimensions = function (handle) {
  // reference: https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getwindowrect
  const rectPointer = Buffer.alloc(16);
  const getWindowRect = user32.GetWindowRect(handle, rectPointer);

  // ⚠ can't get the value
  // reference: https://docs.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmgetwindowattribute
  const extendedRectPointer = Buffer.alloc(16);
  dwmapi.DwmGetWindowAttribute(
    handle,
    'DWMWA_EXTENDED_FRAME_BOUNDS',
    extendedRectPointer,
    pointerToRect(rectPointer)
  );
  console.log('>>>', extendedRectPointer);

  return !getWindowRect
    ? null
    : pointerToRect(rectPointer);
}

// get active window
const activeWindow = user32.GetForegroundWindow();

// get window dimension
const activeWindowDimensions = getWindowDimensions(activeWindow);

// get active window width and height
const activeWindowWidth = activeWindowDimensions.right - activeWindowDimensions.left;
const activeWindowHeight = activeWindowDimensions.bottom - activeWindowDimensions.top;
...

Hope someone can help me. Thank you and keep safe.