QT 获取屏幕尺寸的法子

#include "QDesktopWidget"

QDesktopWidget* desktopWidget = QApplication::desktop();
QRect deskRect = desktopWidget->availableGeometry();  //可用区域
QRect screenRect = desktopWidget->screenGeometry();  //屏幕区域
int w = screenRect.width();
int h = screenRect.height();

if ((w > 0)&&(h > 0))
{
    this->resize(QSize(w,h));
}