Qt：将写入的内容生成本地pdf文件。

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTextDocument>
#include <QtPrintSupport/QPrinter>
#include <QPainter>
#include <QPen>
#include<QTextBrowser>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    connect(ui->pushButton,QPushButton::clicked,this,MainWindow::exportSlot);
}

MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::exportSlot()
{
    QTextDocument  textDocument;
    QPrinter printer(QPrinter::ScreenResolution);
    printer.setPaperSize(QPrinter::A4);
    printer.setPageMargins(30,30,30,30,QPrinter::DevicePixel);
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOutputFileName(QString("Mytest") + ".pdf");
    QPainter painter( &printer );
    QFont font;
    font.setPixelSize(15);
    painter.setFont(font);
    QTextOption textOption( Qt::AlignCenter);
    QPen pen;
    pen.setColor(Qt::black);
    pen.setWidth(1);
    painter.setPen(pen);
    int paperWidth = printer.width();
    int paperHeigth = printer.height();
    painter.drawText( QRect(QPoint( 30,30),QPoint(paperWidth - 30,paperHeigth- 20)),ui->m_pTextEdit->toPlainText (),textOption);
    textDocument.print(&printer);
}#include "mainwindow.h"
#include "ui_mainwindow