QT获取物理尺寸，DPI

原创已于 2022-12-22 11:29:11 修改 · 1.1k 阅读

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#c++ #qt

于 2022-12-21 15:10:09 首次发布

本文介绍了如何在QT5中通过LinuxFB平台设置屏幕分辨率，重点讲解了使用`mmsize=24x24`参数，并展示了获取屏幕物理像素密度和尺寸的方法。

#include <QScreen>
qreal x,y,dpi;
dpi = QGuiApplication::screens().at(0)->physicalDotsPerInch();
x = QGuiApplication::screens().at(0)->physicalDotsPerInchX();
y = QGuiApplication::screens().at(0)->physicalDotsPerInchY();
QSizeF rec = QGuiApplication::screens().at(0)->physicalSize();
qreal rec_w = rec.width();
qreal rec_h = rec.height();
printf("screen physicalDotsPerInch:%f\n", (float)dpi);
printf("screen physicalDotsPerInchX:%f\n", (float)x);
printf("screen physicalDotsPerInchY:%f\n", (float)y);
printf("screen physicalSize w:%f h:%f\n", (float)rec_w, (float)rec_h);

QT5 配置mmsize

QT_QPA_PLATFORM="linuxfb:fb=/dev/fb1:mmsize=24x24"