打印未显示的WebPage

Question

如何打印窗口/小部件上未显示的页面？Qt Code:切换视图

QPainter painter(printer);
m_webView->page()->setViewportSize(m_pageToPrint->mainFrame()->contentsSize());
painter.scale(scale, scale);
m_pageToPrint->mainFrame()->render(&painter);

要复制到剪贴板，切换视图到纯文本模式这是代码使用(现在是从m_webView转换为m_pageToPrint)来打印页面从webView，这是显示，但m_pageToPrint的代码，没有显示，只有加载的超文本标记语言被打印？上述代码的结果是PrinterPreviewer中的一个白色页面。这是加载html的代码，然后调用预览器: Qt Code: Switch视图

m_pageToPrint->mainFrame()->setHtml(finalHTML);
m_printPreviewDialog->exec();

要复制到剪贴板，请将视图切换到纯文本模式。finalHTML是有效的html代码。

Answer 1

我使用以下代码来打印我的HTML报告页面：

报告打印.h

class ReportPrint : public QObject
{
    Q_OBJECT
    public:
        ReportPrint(QObject *parent = 0);
        void printHTML(QUrl url);
    private:
        QWebView m_webView;
        QPrinter m_printer;
        QPrintPreviewDialog *m_preview;
    protected slots:
        void printReady(bool enable);
        void paintRequested(QPrinter*printer);
}

reportprint.cpp

ReportPrint::ReportPrint(QObject *parent) :
    QObject(parent) {
    connect(&m_webView, SIGNAL(loadFinished(bool)),this, SLOT(printReady(bool)));
}

void ReportPrint::printHTML(QUrl url) {
    m_webView.page()->settings()->clearMemoryCaches();
    // here I point to directory which contains printed html file so the engine can found css files
    QUrl base = QUrl::fromLocalFile(QApplication::applicationDirPath() + "templates/");         
    m_webView.setHtml(url,base);
}

void ReportPrint::printReady(bool enable) {
    if(print_to_default_printer) {
        QString pn = QPrinterInfo::defaultPrinter().printerName();
        m_printer.setPrinterName(pn);
        m_printer.setOutputFormat(QPrinter::NativeFormat);
        m_webView.print(&m_printer);
    } else if(print_with_preview) {
        m_preview = new QPrintPreviewDialog(&p_printer);                 
        connect(m_preview,SIGNAL(paintRequested(QPrinter*)),
                this,SLOT(paintRequested(QPrinter*)));
    }

}

void ReportPrint::paintRequested(QPrinter *printer) {
    m_printer.setOutputFormat(QPrinter::NativeFormat);
    m_webView.print(printer);
    m_preview->deleteLater();
}