如何在Qt中打印pdf文件

Question

我曾尝试编写一些代码来使用Qt打印pdf文件但不知何故它无法正常工作.如果有人有任何想法解决这个问题,请提供您的提示.

void ChartViewer::onprintBtnClicked(){ 
    String filename = QFileDialog::getOpenFileName(this,"Open File",QString(),"Pdf File(*.pdf)"); 
    qDebug()<<"Print file name is "<<filename; 
    if(!filename.isEmpty()) { 
        if(QFileInfo(filename).suffix().isEmpty()) 
            filename.append(".pdf"); 

        QPrinter printer(QPrinter::HighResolution);         
        printer.setOutputFormat(QPrinter::PdfFormat);  
        printer.setOutputFileName(filename);
        QPrintDialog*dlg = new QPrintDialog(&printer,this); 

        if(textedit->textCursor().hasSelection()) 
            dlg->addEnabledOption(QAbstractPrintDialog::PrintSelection); 

        dlg->setWindowTitle(tr("Print Document")); 

        if(dlg->exec() == QDialog::Accepted) { 
            textedit->print(&printer); 
        } 

        delete dlg; 
    } 
}

Answer 1

我不明白你的问题,但现在我明白了.你想用Qt打印PDF文件,你不想打印成PDF,对吧？

Qt不支持加载和显示PDF.对于Qt中的PDF支持,您需要外部库poppler.看看这篇文章.

Poppler允许您将PDF文件渲染到QImage中,您可以轻松地像这样打印QImage .

以下是如何将文本打印成PDF文件.

我试着编辑你的代码,以便我可以测试一下它对我有用,你能查一下吗？也许尝试检查您的环境是否QPrinter::isValid()返回true.

#include <QtGui>
#include <QtCore>

int main(int argc, char **argv) {
    QApplication app(argc, argv);
    QTextEdit parent;
    parent.setText("We are the world!");
    parent.show();

    QString filename = QFileDialog::getOpenFileName(&parent,"Open File",QString(),"Pdf File(*.pdf)"); 
    qDebug()<<"Print file name is "<<filename; 
    if(!filename.isEmpty()) {
        if(QFileInfo(filename).suffix().isEmpty()) {
            filename.append(".pdf"); 
        }

        QPrinter printer(QPrinter::HighResolution);         
        printer.setOutputFormat(QPrinter::PdfFormat);  
        printer.setOutputFileName(filename);
        QPrintDialog*dlg = new QPrintDialog(&printer,&parent); 
        dlg->setWindowTitle(QObject::tr("Print Document")); 

        if(dlg->exec() == QDialog::Accepted) { 
            parent.print(&printer); 
        } 
        delete dlg; 
    } 
    return app.exec();
}