iTextSharp PDF printing

本文关键字：printing PDF iTextSharp | 更新日期: 2023-09-27 17:57:30

我正在尝试创建一个方法，将PDF文件直接发送到我的打印机（导致出现打印对话框）。

下面是我一直在写的代码，大部分都可以在这里的论坛上找到。如果我使用iTextSharp创建一个新的PDF文档，它会很好地工作，但一旦我试图将一些JavaScript注入到现有文件中，我就会在调用print()方法时出现异常，称

对象不支持属性或方法"打印"

<script type="text/javascript">
    function load() {
        try {
            var x = document.getElementById("frame1");
            x.print();
        }
        catch (err) {
        }
    }
</script>
<body onload="load();">
    <form id="form1" runat="server">
    <div>
       <iframe id="frame1" src="C:/1686850_1.pdf"  runat="server" frameborder="0" style="height: 0px; width: 0px;" />
    </div>
    </form>
</body>
</html>

.CS文件

using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
public partial class Print : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SetPDF(File.ReadAllBytes("C:''1686850.pdf"), "C:''1686850_1.pdf"); //test files
    }
    private void SetPDF(byte[] file, string outputPath)
    {
        PdfReader reader = new PdfReader(file);
        int pageCount = reader.NumberOfPages;
        Rectangle pageSize = reader.GetPageSize(1);
        Document pdf = new Document(pageSize);
        PdfWriter writer = PdfWriter.GetInstance(pdf, new FileStream(outputPath, FileMode.Create));
        pdf.Open();
        //This action leads directly to printer dialogue
        PdfAction jAction = PdfAction.JavaScript("this.print(true);'r", writer);
        writer.AddJavaScript(jAction);
        //Omitting this loop and simply adding some text to the file produces the behavior I want.
        for (int i = 0; i < pageCount; i++)
        {
            pdf.NewPage();
            PdfImportedPage page = writer.GetImportedPage(reader, i + 1);
            writer.DirectContent.AddTemplate(page, 0, 0);
        }
        pdf.Close();
        //Open the pdf in the frame
        frame1.Attributes["src"] = outputPath;
    }
}

iTextSharp PDF printing

我在这里找到了一种方法：http://wskidmore.com/2011/03/pdf-initial-view-settings-itextsharp/

基于此，我编写了以下代码：

private void PrintMenu()
{
    ...
    var notUriPath = Server.MapPath("~/" + filePathName);
    var doc = new Document();
    var reader = new PdfReader(notUriPath);
    using (var memoryStream = new MemoryStream())
    {
        var writer = PdfWriter.GetInstance(doc, memoryStream);
        doc.Open();
        // this action leads directly to printer dialogue
        var jAction = PdfAction.JavaScript("this.print(true);'r", writer);
        writer.AddJavaScript(jAction);
        var cb = writer.DirectContent;
        doc.AddDocListener(writer);
        for (var p = 1; p <= reader.NumberOfPages; p++)
        {
            doc.SetPageSize(reader.GetPageSize(p));
            doc.NewPage();
            var page = writer.GetImportedPage(reader, p);
            var rot = reader.GetPageRotation(p);
            if (rot == 90 || rot == 270)
                cb.AddTemplate(page, 0, -1.0F, 1.0F, 0, 0, reader.GetPageSizeWithRotation(p).Height);
            else
                cb.AddTemplate(page, 1.0F, 0, 0, 1.0F, 0, 0);
        }
        reader.Close();
        doc.Close();
        File.WriteAllBytes(notUriPath, memoryStream.ToArray());
    }
    theIframeForPrint.Attributes.Add("src", fullFilePath);
}

我希望它能有所帮助！

您想要将Javascript添加到PDF中以打开打印对话框，而不是网页（除非您真的想要网页打印对话框，不是PDF打印对话框）。我以前也这样做过，但没有使用iTextSharp；但快速的谷歌搜索应该会告诉你如何使用iTextSharp添加Javascript来打开打印对话框。

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