qt生成pdf

    CQLPushButton {
        id: button6
        x: 4
        y: 104
        width: 190
        height: 90
        m_text: qsTr("导出pdf")
        onClickedSignal: {
            pdf.open();
        }
    }

    FileDialog {
        id:pdf
        title: "选择保存文件路径"
        folder: shortcuts.desktop
        selectExisting: true
        selectFolder: true
        selectMultiple: false
        onAccepted: {
            rectangle.grabToImage(function(result) {
                var path = pdf.fileUrl + "/aa.pdf";
                var path1 = path.substring(8,path.length);
                console.log(path1);
                printPreviewForm.actionPdfCreate(path1);
            });
        }
    }

void PrintPreviewForm::actionPdfCreate(QString fileName)
{
    qDebug()<<"fileName"<<fileName;
    QFile pdfFile(fileName);
    pdfFile.open(QIODevice::WriteOnly);                 // 打开要写入的pdf文件
    QPdfWriter* pPdfWriter = new QPdfWriter(&pdfFile);  // 创建pdf写入器
    pPdfWriter->setPageSize(QPagedPaintDevice::A4);     // 设置纸张为A4
    pPdfWriter->setResolution(100);                     // 设置纸张的分辨率为300,因此其像素为3508X2479

    int iMargin = 10;                   // 页边距
    pPdfWriter->setPageMargins(QMarginsF(iMargin, iMargin, iMargin, iMargin));

    QPainter* pPdfPainter = new QPainter(pPdfWriter);   // qt绘制工具
    paint(pPdfPainter);
    delete pPdfPainter;
    delete pPdfWriter;
    pdfFile.close();
}