QT5.15.2加载pdf为QGraphicsScene的背景

5.15.2使用pdf

必须要安装QT源码，可以看到编译器lib目录已经有pdf相关的lib文件，d是debug

1.找到源码目录：D:\soft\QT\5.15.2\Src\qtwebengine\include

复制这两个文件夹到编译器的包含目录中:D:\soft\QT\5.15.2\msvc2019_64\include

2.找到D:\soft\QT\5.15.2\Src\qtwebengine\src\pdf\api目录，将目录下的文件夹全部复制替换到D:\soft\QT\5.15.2\msvc2019_64\include\QtPdf中。

3.将D:\soft\QT\5.15.2\Src\qtwebengine\src\pdfwidgets以下文件复制替换到到D:\soft\QT\5.15.2\msvc2019_64\include\QtPdfWidgets中

4.修改pro文件，不用加入附加包含目录，只需要加入附加库目录和lib名称即可

LIBS += -LD:/soft/Qt/5.15.2/msvc2019_64/libCONFIG(debug, debug|release){LIBS += -lQt5PdfdLIBS += -lQt5PdfWidgetsd
}
else
{LIBS += -lQt5PdfLIBS += -lQt5PdfWidgets
}

5.测试

#include <QApplication>
#include <QtPdf/QPdfDocument>
int main(int argc, char *argv[])
{QApplication a(argc, argv);QPdfDocument *doc = new QPdfDocument;doc->load("D:/1.pdf");QSizeF pageSize = doc->pageSize(0);QImage image = doc->render(0,pageSize.toSize());image.save("D:/1.png");return a.exec();
}

加载pdf为QGraphicsScene的背景

#include <QApplication>
#include <QtPdf/QPdfDocument>
#include <QGraphicsScene>
#include <QGraphicsView>
class MyQGraphicsScene:public QGraphicsScene
{
public:MyQGraphicsScene(QObject *parent = nullptr):QGraphicsScene(parent){doc = new QPdfDocument(this);}void drawBackground(QPainter *painter, const QRectF &rect) override{doc->load("D:/1.pdf");QSizeF pageSize = doc->pageSize(0);QImage image = doc->render(0,pageSize.toSize());painter->setPen(Qt::blue);painter->setBrush(image);painter->drawRect(sceneRect());}private:QPdfDocument *doc = nullptr;
};int main(int argc, char *argv[])
{QApplication a(argc, argv);// 创建自定义场景MyQGraphicsScene *scene = new MyQGraphicsScene();scene->setSceneRect(0,0,500,400);// 创建视图，并设置场景QGraphicsView *view = new QGraphicsView(scene);view->setFixedSize(800,600);view->show();return a.exec();
}

重写QGraphicsScene的drawBackground方法即可达到目的