qt中调用打印机打印字符

本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.

环境：

主机:WIN8

开发环境:Qt5.4.0

说明:

调用热敏打印机，打印测试字符

源码:

pro文件加载库文件

#-------------------------------------------------## Project created by QtCreator 2015-01-10T09:52:53##-------------------------------------------------QT       += core guiqtHaveModule(printsupport): QT += printsupportgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = test_printerTEMPLATE = appSOURCES += main.cpp\        mainwindow.cppHEADERS  += mainwindow.hFORMS    += mainwindow.ui

mainwindows.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QPrintDialog>#include <QPrinter>#include <QPrintPreviewDialog>#include <QFileDialog>#include <QPageSetupDialog>namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();private slots:    void on_pushButton_clicked();    void doPrint();        void doPrintPreview();        void printPreview(QPrinter *printer);        void createPdf();    void setUpPage();private:    Ui::MainWindow *ui;};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"#include "ui_mainwindow.h"#include <QDebug>#include <QTextDocument>MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);}MainWindow::~MainWindow(){    delete ui;}void MainWindow::on_pushButton_clicked(){    QPrinter printer;    QTextDocument doc;    QFont font("宋体",2);    doc.setDefaultFont(font);//    QFont font = doc.defaultFont();//    font.setBold(true);//    font.setPointSize(10);//    doc.setDefaultFont(font);    QSizeF s = QSizeF(printer.logicalDpiX() * (58 / 25.4),                      printer.logicalDpiY() * (297 / 25.4));    doc.setPageSize(s);    printer.setPageSizeMM(s);    printer.setOutputFormat(QPrinter::NativeFormat);    doc.setPlainText("I am jdh!\n打印测试");    doc.print(&printer);}void MainWindow::doPrint(){    // 创建打印机对象    QPrinter printer;    // 创建打印对话框    QString printerName = printer.printerName();    if( printerName.size() == 0)        return;    QPrintDialog dlg(&printer, this);    //如果编辑器中有选中区域，则打印选中区域    if (ui->textEdit->textCursor().hasSelection())        dlg.addEnabledOption(QAbstractPrintDialog::PrintSelection);    // 如果在对话框中按下了打印按钮，则执行打印操作    if (dlg.exec() == QDialog::Accepted)    {       //ui->textEdit->print(&printer);       // print the existing document by absoult path        //printFile("D:/1.doc");        QTextDocument doc;        //doc.setHtml(htmlString);        QFont font = doc.defaultFont();        font.setBold(true);        font.setPointSize(10);        doc.setDefaultFont(font);        QSizeF s = QSizeF(printer.logicalDpiX() * (58 / 25.4), printer.logicalDpiY() * (297 / 25.4));        //doc.setPageSize(s);        printer.setPageSizeMM(s);        printer.setOutputFormat(QPrinter::NativeFormat);        doc.setHtml("店联");        doc.print(&printer);    }}// 打印预览void MainWindow::doPrintPreview(){    QPrinter printer;    // 创建打印预览对话框    QPrintPreviewDialog preview(&printer, this);    // 当要生成预览页面时，发射paintRequested()信号    connect(&preview, SIGNAL(paintRequested(QPrinter*)),                  this,SLOT(printPreview(QPrinter*)));    preview.exec();}void MainWindow::printPreview(QPrinter *printer){    //ui->textEdit->print(printer);    QTextDocument doc;    //doc.setHtml(htmlString);//    QFont font = doc.defaultFont();//    font.setBold(true);//    font.setPointSize(font.pointSize() + 1);//    doc.setDefaultFont(font);    QSizeF s = QSizeF(printer->logicalDpiX() * (58 / 25.4), printer->logicalDpiY() * (297 / 25.4));//    doc.setPageSize(s);    printer->setPageSizeMM(s);    printer->setOutputFormat(QPrinter::NativeFormat);    doc.setHtml("店联");    doc.print(printer);}// 生成PDF文件void MainWindow::createPdf(){    QString fileName = QFileDialog::getSaveFileName(this, tr("导出PDF文件"), QString(), "*.pdf");    if (!fileName.isEmpty()) {        // 如果文件后缀为空，则默认使用.pdf        if (QFileInfo(fileName).suffix().isEmpty())            fileName.append(".pdf");        QPrinter printer;        // 指定输出格式为pdf        printer.setOutputFormat(QPrinter::PdfFormat);        printer.setOutputFileName(fileName);        ui->textEdit->print(&printer);    }}// 页面设置void MainWindow::setUpPage(){    QPrinter printer;    QPageSetupDialog pageSetUpdlg(&printer, this);    if (pageSetUpdlg.exec() == QDialog::Accepted)    {        printer.setOrientation(QPrinter::Landscape);    }    else    {        printer.setOrientation(QPrinter::Portrait);    }}

参考资料：

1.浅谈QT打印功能实现