Qt PDF教程？

#include <QCoreApplication>
#include <QCommandLineParser>
#include <QCommandLineOption>
#include <QTextDocument>
#include <QFile>
#include <QTextCursor>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QCoreApplication::setApplicationName("QtPDFTutorial");
    QCoreApplication::setApplicationVersion("1.0");

    // 使用 getopt 简化命令行参数解析
    QCommandLineParser parser;
    parser.setApplicationDescription("Qt PDF Tutorial");
    parser.addHelpOption();
    parser.addVersionOption();

    QCommandLineOption pdfOption(QStringList() << "f" << "pdf");
    parser.addOption(pdfOption);

    QCommandLineOption helpOption();
    parser.addOption(helpOption);

    // 解析命令行参数
    parser.process(app);

    if (parser.isSet(helpOption)) {
        qDebug() << "Usage: " << parser.applicationName() << " [options] file.pdf";
        qDebug() << "Options:" << parser.helpText();
        return 0;
    }

    QString pdfFile = parser.value(pdfOption);
    if (pdfFile.isEmpty()) {
        qDebug() << "Error: No PDF file provided";
        return 1;
    }

    QTextDocument document;
    document.setHtml(QString("Hello, world!"));

    QFile file(pdfFile);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Error: Failed to open PDF file" << file.errorString();
        return 1;
    }

    QTextCursor cursor(&document);
    cursor.select(QTextCursor::WordUnderCursor);
    QString selectedText = cursor.selectedText();

    qDebug() << "Selected text:" << selectedText;

    cursor.insertText("This is a test.");

    QTextDocument::iterator it;
    it = cursor.document().begin();
    while (it != cursor.document().end()) {
        qDebug() << "Text: " << it.text();
        ++it;
    }

    file.close();

    return app.exec();
}