win32 EnumWindows in dart

使用和C里面完全一样

late final int _workerWHexHandle;
int _enumWindowsProc(int hWnd,int lParam){
  /// print(hWnd.toRadixString(16));
  int pHWnd = FindWindowEx(hWnd, 0, TEXT("SHELLDLL_DefView"), nullptr);
  if(pHWnd != 0){
    //print(int.parse(hWnd.toString(),radix: 16));
    _workerWHexHandle = FindWindowEx(0, hWnd, nullptr, nullptr);
    //表示可以退出了
    return FALSE;
  }
  //表示继续执行
  return TRUE;
}

void amin(){
  final enumWinsFunc = Pointer.fromFunction<EnumWindowsProc>(_enumWindowsProc, 0);
  EnumWindows(enumWinsFunc, 0);
  return _workerWHexHandle;
}