使用 Prawn 从 html 生成 pdf

Question

我想从 html 生成 pdf。 gem prawn 似乎是最受欢迎的。我下载了它的手册，但是没有关于如何从 html 生成 pdf 的信息。

特别是，我还需要它在 Heroku 上工作，但这是第二个目标。

那么如何使用Prawn从html生成pdf？

Answer 1

寻找Pdfkit，它是第二受欢迎的宝石RubyToolbox。它使用 wkhtmltopdf 从 HTML 生成 PDF。在RailsCasts 上是一个较旧的教程。

Answer 2

这是一个使用虾从 html 生成 pdf 的示例代码

/// <summary>
/// Convert the HTML code from the specified URL to a PDF document
    and send the document to the browser
/// </summary>
private void ConvertURLToPDF()
{
    string urlToConvert = textBoxWebPageURL.Text.Trim();

    // Create the PDF converter. Optionally the HTML viewer width can
        be specified as parameter
    // The default HTML viewer width is 1024 pixels.
    PdfConverter pdfConverter = new PdfConverter();

    // set the license key - required
    pdfConverter.LicenseKey = "R8nYyNnI2MjRxtjI29nG2drG0dHR0Q==";

    // set the converter options - optional
    pdfConverter.PdfDocumentOptions.PdfPageSize = PdfPageSize.A4;
    pdfConverter.PdfDocumentOptions.PdfCompressionLevel = PdfCompressionLevel.Normal;
    pdfConverter.PdfDocumentOptions.PdfPageOrientation = PdfPageOrientation.Portrait;


    // set if header and footer are shown in the PDF - optional - default
        is false 
    pdfConverter.PdfDocumentOptions.ShowHeader = cbAddHeader.Checked;
    pdfConverter.PdfDocumentOptions.ShowFooter = cbAddFooter.Checked;
    // set if the HTML content is resized if necessary to fit the PDF
        page width - default is true
    pdfConverter.PdfDocumentOptions.FitWidth = cbFitWidth.Checked;

    // set the embedded fonts option - optional - default is false
    pdfConverter.PdfDocumentOptions.EmbedFonts = cbEmbedFonts.Checked;
    // set the live HTTP links option - optional - default is true
    pdfConverter.PdfDocumentOptions.LiveUrlsEnabled = cbLiveLinks.Checked;

    // set if the JavaScript is enabled during conversion to a PDF - default
        is true
    pdfConverter.JavaScriptEnabled = cbClientScripts.Checked;

    // set if the images in PDF are compressed with JPEG to reduce the
        PDF document size - default is true
    pdfConverter.PdfDocumentOptions.JpegCompressionEnabled = cbJpegCompression.Checked;

    // enable auto-generated bookmarks for a specified list of HTML selectors
        (e.g. H1 and H2)
    if (cbBookmarks.Checked)
    {
        pdfConverter.PdfBookmarkOptions.HtmlElementSelectors = new string[] { "H1", "H2" };
    }

    // add HTML header
    if (cbAddHeader.Checked)
        AddHeader(pdfConverter);
    // add HTML footer
    if (cbAddFooter.Checked)
        AddFooter(pdfConverter);

    // Performs the conversion and get the pdf document bytes that can

    // be saved to a file or sent as a browser response
    byte[] pdfBytes = pdfConverter.GetPdfBytesFromUrl(urlToConvert);

    // send the PDF document as a response to the browser for download
    System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
    response.Clear();
    response.AddHeader("Content-Type", "application/pdf");
    if (radioAttachment.Checked)
        response.AddHeader("Content-Disposition", 
                String.Format("attachment; filename=GettingStarted.pdf; size={0}", 
                pdfBytes.Length.ToString()));
    else
        response.AddHeader("Content-Disposition", 
                String.Format("inline; filename=GettingStarted.pdf; size={0}", 
                pdfBytes.Length.ToString()));
    response.BinaryWrite(pdfBytes);
    // Note: it is important to end the response, otherwise the ASP.NET
    // web page will render its content to PDF document stream
    response.End();
}