How does QT call the printer to print web pages and files in html?

这篇文章介绍的内容是QT如何实现调用打印机来打印html中的网页及文件，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

工程里用到 QWebView， 

所以要在.pro里加上 QT += webkit webkitwidgets
打印用到了 QPrinter，
所以要在.pro里加上 qtHaveModule(printsupport): QT += printsupport

直接附上源码吧，当然也是根据网上一些前辈的经验代码和实际使用情况改进而来:

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTableWidget>
#include <QPainter>
#include <QtPrintSupport/QPrinter>
#include <QtPrintSupport/QPrintDialog>
#include <QFileInfo>
#include <windows.h>
#include <QFileDialog>
#include <QtPrintSupport/QPrintPreviewDialog>
#include <QtPrintSupport/QPageSetupDialog>
#include <fstream>
#include <iostream>
#include <sstream>
#include <QWebView>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT
public:    
   explicit Widget(QWidget *parent = 0);
    ~Widget();
    
private slots:
    void on_pushButton_clicked();    
    void printPreview(QPrinter *printer);
private:
    Ui::Widget *ui;    
    void doPrint();    
    void doPrintPreview();    
    void createPdf();    
    void setUpPage();    
    bool printFile(const QString & filePath);

};

实现：

#include "Widget.h"
#include "ui_Widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);    //这里没用QFile文件读html文件，因为会使html网页中文成乱码
    QString strHtmltext;    
    std::string bufStr;    
    std::ifstream readFile;
    readFile.open("D:\\qqq.html");    
    if(readFile.is_open())
    {    
            while(getline(readFile, bufStr))
        {
            strHtmltext += QString(bufStr.data());
        }
        readFile.close();
    }
    ui->webView->setHtml(strHtmltext);

}

Widget::~Widget()
{    delete ui;
}//点击这里触发打印动作！
void Widget::on_pushButton_clicked()
{

    doPrint();
//    doPrintPreview();
//    printFile("D:/123.txt");
}

void Widget::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);#if 0
    //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);
#endif
    // 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)
    //这里使用默认打印机，不用每次选择打印机
    {
//       ui->textEdit->print(&printer);
        ui->webView->print(&printer);      
        
       // print the existing document by absoult path
      //  printFile("D:/myRSM.doc");
    }
}
// 打印预览void Widget::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 Widget::printPreview(QPrinter *printer)
{
//    ui->textEdit->print(printer);
    ui->webView->print(printer);
}

// 生成PDF文件
void Widget::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);
        ui->webView->print(&printer);
    }
}
// 页面设置void Widget::setUpPage()
{
    QPrinter printer;
    QPageSetupDialog pageSetUpdlg(&printer, this);    
    if (pageSetUpdlg.exec() == QDialog::Accepted)
    {
        printer.setOrientation(QPrinter::Landscape);
    }    
    else
    {
        printer.setOrientation(QPrinter::Portrait);
    }
}

bool Widget::printFile(const QString & filePath)
{    
    // create a printer
    QPrinter printer;
    QString printerName = printer.printerName();    
    // no default printer or no file return false
    if( printerName.size() == 0 || filePath.size() == 0)    
        return false;
    QFileInfo fi(filePath);    
    if(!fi.exists())    
        return false;    
    int ret = 0;    
    //执行DOS命令调系统打印
    ret = (int)ShellExecuteW(NULL,
                  QString("print").toStdWString().c_str(),
                  filePath.toStdWString().c_str(),
                  NULL,
                  NULL,
                  SW_HIDE);    
    // if return number bigger than 31 indicate succ
    if (ret > SE_ERR_NOASSOC)    
        return true;    
    return false;
}

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