iTextSharp PDF打印

如何解决iTextSharp PDF打印

| 我正在尝试创建一种将PDF文件直接发送到我的打印机的方法（导致出现打印对话框）。以下是我一直在努力的代码-大多数代码都在这里的论坛中找到。如果我使用iTextSharp创建新的PDF文档，效果很好，但是当我尝试向现有文件中注入一些JavaScript时，调用print()方法时出现异常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);
        }
        pdf.Close();

        //Open the pdf in the frame
        frame1.Attributes[\"src\"] = outputPath;
    }
}

解决方法

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,-1.0F,1.0F,reader.GetPageSizeWithRotation(p).Height);
            else
                cb.AddTemplate(page,0);
        }

        reader.Close();
        doc.Close();
        File.WriteAllBytes(notUriPath,memoryStream.ToArray());
    }

    theIframeForPrint.Attributes.Add(\"src\",fullFilePath);
}

希望对您有所帮助！ ,您想要将Javascript添加到PDF中以打开打印对话框，而不是网页（除非您确实确实想要网页打印对话框，而不是PDF打印对话框）。我之前已经做过，但是没有使用iTextSharp。但是Google的快速搜索应该可以告诉您如何使用iTextSharp打开打印对话框来添加Javascript。

如何解决iTextSharp PDF打印

解决方法

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