如何使用 C#、asp.net 获取客户端 PC 打印机设置

Question

我在 Web 应用程序上运行 SSRS 报告。我想直接在客户端的打印机上打印 SSRS 报告数据。该应用程序在我的电脑上运行良好，但是当我在 IIS Web 服务器上发布该应用程序时，该应用程序不是检索客户端电脑的打印机设置，而是尝试查找安装在服务器计算机中的打印机。

我正在使用 System.Drawing.Printing，有什么方法可以在客户端计算机中获取已安装打印机的设置，或者我们可以使用 C# 从 Web 打印 SSRS 报告吗？

我正在使用以下代码。

    using System;
    using System.IO;
    using System.Text;
    using System.Globalization;
    using System.Drawing;
    using System.Drawing.Imaging;
    using System.Drawing.Printing;
    using System.Collections.Specialized;
    using System.Collections.Generic;
    using Microsoft.Reporting.WebForms;
    using SeaWorld.Common.Helper;

namespace SeaWorld.BusinessObjects.BAL.Generated
{
    public class ReportPrintDocument : PrintDocument
    {
        private PageSettings m_pageSettings;
        private int m_currentPage;
        private List<Stream> m_pages = new List<Stream>();

        public ReportPrintDocument(ServerReport serverReport): this((Report)serverReport)
        {
            RenderAllServerReportPages(serverReport);
        }

        //public ReportPrintDocument(LocalReport localReport): this((Report)localReport)
        //{
        //    RenderAllLocalReportPages(localReport);
        //}

        private ReportPrintDocument(Report report)
        {
            // Set the page settings to the default defined in the report
            ReportPageSettings reportPageSettings = report.GetDefaultPageSettings();

            // The page settings object will use the default printer unless
            // PageSettings.PrinterSettings is changed.  This assumes there
            // is a default printer.
            m_pageSettings = new PageSettings();
            m_pageSettings.PaperSize = reportPageSettings.PaperSize;
            m_pageSettings.Margins = reportPageSettings.Margins;
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);

            if (disposing)
            {
                foreach (Stream s in m_pages)
                {
                    s.Dispose();
                }

                m_pages.Clear();
            }
        }

        protected override void OnBeginPrint(PrintEventArgs e)
        {
            base.OnBeginPrint(e);

            m_currentPage = 0;
        }

        protected override void OnPrintPage(PrintPageEventArgs e)
        {
            base.OnPrintPage(e);

            Stream pageToPrint = m_pages[m_currentPage];
            pageToPrint.Position = 0;

            // Load each page into a Metafile to draw it.
            using (Metafile pageMetaFile = new Metafile(pageToPrint))
            {
                Rectangle adjustedRect = new Rectangle(
                        e.PageBounds.Left - (int)e.PageSettings.HardMarginX,
                        e.PageBounds.Top - (int)e.PageSettings.HardMarginY,
                        e.PageBounds.Width,
                        e.PageBounds.Height);

                // Draw a white background for the report
                e.Graphics.FillRectangle(Brushes.White, adjustedRect);

                // Draw the report content
                e.Graphics.DrawImage(pageMetaFile, adjustedRect);

                // Prepare for next page.  Make sure we haven't hit the end.
                m_currentPage++;
                e.HasMorePages = m_currentPage < m_pages.Count;
            }
        }

        protected override void OnQueryPageSettings(QueryPageSettingsEventArgs e)
        {
            e.PageSettings = (PageSettings)m_pageSettings.Clone();
        }

        private void RenderAllServerReportPages(ServerReport serverReport)
        {
            string deviceInfo = CreateEMFDeviceInfo();

            // Generating Image renderer pages one at a time can be expensive.  In order
            // to generate page 2, the server would need to recalculate page 1 and throw it
            // away.  Using PersistStreams causes the server to generate all the pages in
            // the background but return as soon as page 1 is complete.
            NameValueCollection firstPageParameters = new NameValueCollection();
            firstPageParameters.Add("rs:PersistStreams", "True");

            // GetNextStream returns the next page in the sequence from the background process
            // started by PersistStreams.
            NameValueCollection nonFirstPageParameters = new NameValueCollection();
            nonFirstPageParameters.Add("rs:GetNextStream", "True");

            string mimeType;
            string fileExtension;
            Stream pageStream = serverReport.Render("IMAGE", deviceInfo, firstPageParameters, out mimeType, out fileExtension);

            // The server returns an empty stream when moving beyond the last page.
            while (pageStream.Length > 0)
            {
                m_pages.Add(pageStream);

                pageStream = serverReport.Render("IMAGE", deviceInfo, nonFirstPageParameters, out mimeType, out fileExtension);
            }
        }

        private void RenderAllLocalReportPages(LocalReport localReport)
        {
            string deviceInfo = CreateEMFDeviceInfo();

            Warning[] warnings;
            localReport.Render("IMAGE", deviceInfo, LocalReportCreateStreamCallback, out warnings);
        }

        private Stream LocalReportCreateStreamCallback(
            string name,
            string extension,
            Encoding encoding,
            string mimeType,
            bool willSeek)
        {
            MemoryStream stream = new MemoryStream();
            m_pages.Add(stream);

            return stream;
        }

        private string CreateEMFDeviceInfo()
        {
            PaperSize paperSize = m_pageSettings.PaperSize;
            Margins margins = m_pageSettings.Margins;

            // The device info string defines the page range to print as well as the size of the page.
            // A start and end page of 0 means generate all pages.
            return string.Format(
                CultureInfo.InvariantCulture,
                "<DeviceInfo><OutputFormat>emf</OutputFormat><StartPage>0</StartPage><EndPage>0</EndPage><MarginTop>{0}</MarginTop><MarginLeft>{1}</MarginLeft><MarginRight>{2}</MarginRight><MarginBottom>{3}</MarginBottom><PageHeight>{4}</PageHeight><PageWidth>{5}</PageWidth></DeviceInfo>",
                ToInches(margins.Top),
                ToInches(margins.Left),
                ToInches(margins.Right),
                ToInches(margins.Bottom),
                ToInches(paperSize.Height),
                ToInches(paperSize.Width));
        }

        private static string ToInches(int hundrethsOfInch)
        {
            double inches = hundrethsOfInch / 100.0;
            return inches.ToString(CultureInfo.InvariantCulture) + "in";
        }
    }
}



On print button click

 void ctrlSettingToolbar_btnPrintPressed(object sender, EventArgs e)
        {
            try
            {
                ReportPrintDocument rp = new ReportPrintDocument(rptBillOfLoadings.ServerReport);

                rp.Print();
            }
            catch (Exception ex) 
            {
                LogHelper.PrintError("Error:", ex);
            }
        }

Answer 1

你可以使用javascript函数window.Print() 这将列出您的客户端机器打印机并打印您的页面。

希望下面的代码会有所帮助..try

<html>
<head>
<script>
function page()
  {
  window.print()
  }
</script>
</head>
<body>

<input type="button" value="Print page" onclick="page()">

</body>
</html>

但这将打印整个页面..在您的情况下，它是要打印的报告

希望这个链接可以指导你

print crystal report to client printer

print report to client default printer