更新代码

widget/screenwidget/frmscreenwidget.cpp

@@ -10,7 +10,7 @@ frmScreenWidget::frmScreenWidget(QWidget *parent) : QWidget(parent), ui(new Ui::
 frmScreenWidget::~frmScreenWidget()
 {
     delete ui;
-    exit(0); 
+    exit(0);
 }
 
 void frmScreenWidget::on_pushButton_clicked()

widget/screenwidget/main.cpp

@@ -6,14 +6,9 @@
 
 int main(int argc, char *argv[])
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5,0,0))
-    QApplication::setAttribute(Qt::AA_Use96Dpi);
-#endif
-#if (QT_VERSION >= QT_VERSION_CHECK(5,14,0))
-    QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::Floor);
-#endif
-
+    qputenv("QT_FONT_DPI", "96");
     QApplication a(argc, argv);
+
     QFont font;
     font.setFamily("Microsoft Yahei");
     font.setPixelSize(13);