如何在QT中将pdf文件转换为png (image)文件

#include <QCoreApplication>
#include <poppler/qt5/poppler-qt5.h>
#include <QImage>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 打开PDF文件
    Poppler::Document *pdfDoc = Poppler::Document::load("input.pdf");
    if (!pdfDoc || pdfDoc->isLocked()) {
        qDebug() << "无法打开PDF文件或文件已锁定";
        return -1;
    }

    // 获取PDF的页数
    int numPages = pdfDoc->numPages();

    // 遍历每一页，将其转换为PNG图片
    for (int i = 0; i < numPages; i++) {
        Poppler::Page *pdfPage = pdfDoc->page(i);
        QImage image = pdfPage->renderToImage();

        // 保存为PNG文件
        QString outputFileName = QString("output_%1.png").arg(i);
        image.save(outputFileName);

        delete pdfPage;
    }

    delete pdfDoc;

    return a.exec();
}

LIBS += -lpoppler-qt5