在asp.net中打印不带打印对话框的PDF

本文关键字:打印 对话框 PDF net asp | 更新日期: 2023-09-27 18:26:36

我在ASP.NET中有一个按钮,当它被点击时,它会得到一个rdlc文件,并生成一个带有打印对话框屏幕的PDF文件。我想要的是在没有打印对话框的情况下直接打印它,我知道它可以用Javascript完成,但我不知道如何用Javascript完成。

    <iframe id="frmPrint" name="IframeName" width="500" height="200" runat="server"    style="display: none"></iframe>   

aspx.cs 中的代码

public void PrintTicket()
    {
        string[] streamids;
        string reportType = "PDF";
        string mimeType;
        string encoding;
        //string fileNameExtension = "pdf";
        string extension;
        LocalReport report = new LocalReport();
        //Displays ticket letter and number in ticket
        report.ReportPath = "PrintTicket.rdlc";
        ReportParameter ticket_parameter = new ReportParameter();
        ticket_parameter.Name = "Ticket";
        ticket_parameter.Values.Add(TicketNo);
        report.SetParameters(new ReportParameter[] { ticket_parameter });
        //Displays date and time in ticket
        ReportParameter date = new ReportParameter();
        date.Name = "Date_Time";
        date.Values.Add(System.DateTime.Now.ToString());
        report.SetParameters(new ReportParameter[] { date });
        //Displays branch location in ticket
        ReportParameter location_parameter = new ReportParameter();
        location_parameter.Name = "Location";
        location_parameter.Values.Add(location);
        report.SetParameters(new ReportParameter[] { location_parameter });

        string deviceInfo =
          "<DeviceInfo>" +
          "  <OutputFormat>EMF</OutputFormat>" +
          "  <PageWidth>8.5in</PageWidth>" +
          "  <PageHeight>11in</PageHeight>" +
          "  <MarginTop>0.10in</MarginTop>" +
          "  <MarginLeft>0.02in</MarginLeft>" +
          "  <MarginRight>0.25in</MarginRight>" +
          "  <MarginBottom>0.15in</MarginBottom>" +
          "</DeviceInfo>";
        Warning[] warnings;
        byte[] bytes = report.Render("PDF", deviceInfo, out mimeType, out encoding, out extension, out streamids, out warnings);
        FileStream fs = new FileStream(HttpContext.Current.Server.MapPath("output2.pdf"), FileMode.Create);
        fs.Write(bytes, 0, bytes.Length);
        fs.Close();
        //Open existing PDF
        Document document = new Document(PageSize.LETTER);
        PdfReader reader = new PdfReader(HttpContext.Current.Server.MapPath("output2.pdf"));
        //Getting a instance of new PDF writer
        PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(HttpContext.Current.Server.MapPath("Print.pdf"), FileMode.Create));
        document.Open();
        PdfContentByte cb = writer.DirectContent;
        int i = 0;
        int p = 0;
        int n = reader.NumberOfPages;
        iTextSharp.text.Rectangle psize = reader.GetPageSize(1);
        float width = psize.Width;
        float height = psize.Height;
        //Add Page to new document
        while (i < n)
        {
            document.NewPage();
            p++;
            i++;
            PdfImportedPage page1 = writer.GetImportedPage(reader, i);
            cb.AddTemplate(page1, 0, 0);
        }
        //Attach javascript to the document
        PdfAction jAction = PdfAction.JavaScript("this.print(true);'r", writer);
        writer.AddJavaScript(jAction);
        document.Close();
        //Attach pdf to the iframe
        frmPrint.Attributes["src"] = "Print.pdf";
    }  

在asp.net中打印不带打印对话框的PDF

正如Steven V所说,JavaScript本身永远不会在没有对话框的情况下打印。你能想象你那台令人毛骨悚然的打印机突然打印出奇怪的页面吗?

不过,我可以提出一个替代方案。既然您使用的是ASP.NET,为什么不使用第三方PDF生成器呢?请在服务器端生成一个PDF文件,然后用ajax向用户返回一个链接。用户会看到一个按钮:"获取PDF",他会点击它,就会出现一个指向真实PDF的链接!哇!

附言:你可以在这里查看一些第三方pdf生成器:如何在ASP.NET 中创建PDF

我认为一个适用于每个浏览器的通用解决方案很难实现,但也有一些特定于浏览器的解决方案。

例如,在Firefox中,您可以按照以下步骤激活静默打印:

  1. 在地址栏中键入about:config,然后输入
  2. 在空白处单击鼠标右键,然后选择"新建">"布尔"
  3. 创建一个名为print.always_print_silent的新字符串并将其设置为True

InternetExplorer中,您可以使用VBScriptsub:

<script language='VBScript'>
Sub Print()
       OLECMDID_PRINT = 6
       OLECMDEXECOPT_DONTPROMPTUSER = 2
       OLECMDEXECOPT_PROMPTUSER = 1
       call WB.ExecWB(OLECMDID_PRINT, OLECMDEXECOPT_DONTPROMPTUSER,1)
End Sub
document.write "<object ID='WB' WIDTH=0 HEIGHT=0 CLASSID='CLSID:8856F961-340A-11D0-A96B-00C04FD705A2'></object>"
</script>

然后,您可以使用通过Javascript进行打印

window.print();