参考：https://blog.csdn.net/xuebin5260/article/details/50483179
https://blog.csdn.net/u013541325/article/details/106966650?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_baidulandingword-0&spm=1001.2101.3001.4242
//获取可用桌面大小
QRect deskRect = QApplication::desktop()->availableGeometry();
int w = deskRect.width();
int h =deskRect.height();
//获取主屏幕分辨率
QRect screenRect = QApplication::desktop()->screenGeometry();
//获取屏幕数量
int nScreenCount = QApplication::desktop()->screenCount();
int width = this->width();//获取窗口宽度
int height = this->height();
int test = 10;
