本文共 4524 字，大约阅读时间需要 15 分钟。
qt中调用打印机打印字符
本文博客链接:,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#include #include #include #include #include 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参考资料：#include 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); }}
1.
再分享一下我老师大神的人工智能教程吧。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！