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Upload dtk-font and qt-font demo project files and build script.

qt-font/fonts.qrc

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+<RCC>
+    <qresource prefix="/">
+        <file>fonts/华康少女字体.ttf</file>
+    </qresource>
+</RCC>

qt-font/main.cpp

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+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+
+    MainWindow w;
+    w.show();
+
+    return a.exec();
+}

qt-font/mainwindow.cpp

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+#include "mainwindow.h"
+
+#include <QFontDatabase>
+#include <QLayout>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent),
+      //    实例化窗口控件
+      button_1(new QPushButton),
+      button_2(new QPushButton)
+{
+    //  初始化主窗口
+    setCentralWidget(w);    //  将 w 作为窗口的用户部分
+    setFixedSize(400, 300); //  改变窗口大小应当改变 MainWindow 的大小
+
+    //  载入字体
+    int loadedFontID = QFontDatabase::addApplicationFont(":/fonts/华康少女字体.ttf");
+    QStringList loadedFontFamilies = QFontDatabase::applicationFontFamilies(loadedFontID);
+    if(!loadedFontFamilies.isEmpty())
+        font = loadedFontFamilies.at(0);
+
+    //  设置按钮样式
+    button_1->setParent(w);
+    button_1->resize(300, 100);
+    button_1->setText("这是一个带有字体样式的 QPushButton");
+    button_1->setFont(font);
+
+    button_2->setParent(w);
+    button_2->resize(300, 100);
+    button_2->setText("这是一个没有字体样式的 QPushButton");
+
+    //  设置按钮布局
+    QVBoxLayout *layout = new QVBoxLayout;
+    layout->setAlignment(Qt::AlignCenter);
+    layout->addWidget(button_1);
+    layout->addSpacing(50);
+    layout->addWidget(button_2);
+
+    w->setLayout(layout);
+}
+
+MainWindow::~MainWindow()
+{
+    delete w;
+}

qt-font/mainwindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QPushButton>
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    QWidget *w = new QWidget;   //  w 是窗口的用户区，应当是所有窗口中控件的父
+
+    QPushButton *button_1;
+    QPushButton *button_2;
+
+    QFont font;                 //  自定义字体
+};
+
+#endif // MAINWINDOW_H

qt-font/qt-font.pro

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2020-10-22T23:50:10
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = qt-font
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which has been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+CONFIG += c++11
+
+SOURCES += \
+        main.cpp \
+        mainwindow.cpp
+
+HEADERS += \
+        mainwindow.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
+
+RESOURCES += \
+    fonts.qrc