打印从WebBrowser控件在设置默认值后打印到错误的打印机

2 回答

• 5

  我能够使用以下代码，而无需打开/关闭单独的表单 . 自IE6以来我一直在寻找这个......

  另见这两篇文章 . Programmatically changing the destination printer for a WinForms WebBrowser control

  Print html document from Windows Service without print dialog

  // Add references for: COM:  Microsoft Internet Controls; .NET: System.Management.dll
  using System;
  using System.Reflection;
  using System.Threading;
  using SHDocVw;
  using System.Windows.Controls;
  using System.Management;
  
  namespace HTMLPrinting
  {
     public class HTMLPrinter
     {
        private bool documentLoaded;
        private bool documentPrinted;
        private string originalDefaultPrinterName;
  
        private void ie_DocumentComplete(object pDisp, ref object URL)
        {
           documentLoaded = true;
        }
  
        private void ie_PrintTemplateTeardown(object pDisp)
        {
           documentPrinted = true;
        }
  
        public void Print(string htmlFilename, string printerName)
        { 
           // Preserve default printer name
           originalDefaultPrinterName = GetDefaultPrinterName();
           // set new default printer
           SetDefaultPrinter(printerName);
           // print to printer
           Print(htmlFilename);
        }
  
        public void Print(string htmlFilename)
        {
           documentLoaded = false;
           documentPrinted = false;
  
           InternetExplorer ie = new InternetExplorer();
           ie.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(ie_DocumentComplete);
           ie.PrintTemplateTeardown += new DWebBrowserEvents2_PrintTemplateTeardownEventHandler(ie_PrintTemplateTeardown);
  
           object missing = Missing.Value;
  
           ie.Navigate(htmlFilename, ref missing, ref missing, ref missing, ref missing);
           while (!documentLoaded && ie.QueryStatusWB(OLECMDID.OLECMDID_PRINT) != OLECMDF.OLECMDF_ENABLED)
              Thread.Sleep(100);
  
           ie.ExecWB(OLECMDID.OLECMDID_PRINT, OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref missing, ref missing);
  
           // Wait until the IE is done sending to the printer
           while (!documentPrinted)
              Thread.Sleep(100);
  
           // Remove the event handlers
           ie.DocumentComplete -= ie_DocumentComplete;
           ie.PrintTemplateTeardown -= ie_PrintTemplateTeardown;
           ie.Quit();
  
           // reset to original default printer if needed
           if (GetDefaultPrinterName() != originalDefaultPrinterName)
           {
              SetDefaultPrinter(originalDefaultPrinterName);
           }
        }
  
        public static string GetDefaultPrinterName()
        {
           var query = new ObjectQuery("SELECT * FROM Win32_Printer");
           var searcher = new ManagementObjectSearcher(query);
  
           foreach (ManagementObject mo in searcher.Get())
           {
              if (((bool?)mo["Default"]) ?? false)
              {
                 return mo["Name"] as string;
              }
           }
  
           return null;
        }
  
        public static bool SetDefaultPrinter(string defaultPrinter)
        {
            using (ManagementObjectSearcher objectSearcher = new ManagementObjectSearcher("SELECT * FROM Win32_Printer"))
            {
                using (ManagementObjectCollection objectCollection = objectSearcher.Get())
                {
                    foreach (ManagementObject mo in objectCollection)
                    {
                        if (string.Compare(mo["Name"].ToString(), defaultPrinter, true) == 0)
                        {
                            mo.InvokeMethod("SetDefaultPrinter", null, null);
                            return true;
                        }
                    }
                }
            }
            return true;
        }
     }
  }
  

  回复于 2024-05-04T11:34:33+08:00
• 0

  我创建了一个没有任何内容的表单 . 启动/关闭此表单的操作使其转到正确的打印机...我不知道为什么这样可行，但必须有一些函数可以被调用来模拟那里发生的任何动作 .

  回复于 2024-05-04T11:34:33+08:00