在没有打印对话框的情况下从 Windows 服务打印 html 文档 [英] Print html document from Windows Service without print dialog

问题描述

我正在使用 Windows 服务，我想在服务启动时打印 .html 页面.我正在使用此代码并且打印良好.但是打印对话框来了，没有打印对话框怎么打印?

I am using a windows service and i want to print a .html page when the service will start. I am using this code and it's printing well. But a print dialog box come, how do i print without the print dialog box?

public void printdoc(string document)
{
    Process printjob = new Process();

    printjob.StartInfo.FileName = document;
    printjob.StartInfo.UseShellExecute = true;
    printjob.StartInfo.Verb = "print";
    printjob.StartInfo.CreateNoWindow = true;
    printjob.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

    printjob.Start();
}

有没有其他方法可以在不显示打印对话框的情况下打印此内容.

Have there any other way to print this without showing the print dialog box.

更新:响应这个:

但是我已经使用过这个类但是当我调用

But i have already used this class but when i am calling the

axW.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT,SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_PROMPTUSER , ref em, ref em);

当我从窗口服务使用时，我的程序在此处被阻止，但它在 Windows 应用程序中运行良好.

My program getting block here when i am using from window service but it is working fine from windows application.

推荐答案

首先，代码如下:

using System.Reflection;
using System.Threading;
using SHDocVw;

namespace HTMLPrinting
{
  public class HTMLPrinter
  {
    private bool documentLoaded;
    private bool documentPrinted;

    private void ie_DocumentComplete(object pDisp, ref object URL)
    {
      documentLoaded = true;
    }

    private void ie_PrintTemplateTeardown(object pDisp)
    {
      documentPrinted = true;
    }

    public void Print(string htmlFilename)
    {
      documentLoaded = false;
      documentPrinted = false;

      InternetExplorer ie = new InternetExplorerClass();
      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);
      while (!documentPrinted)
        Thread.Sleep(100);

      ie.DocumentComplete -= ie_DocumentComplete;
      ie.PrintTemplateTeardown -= ie_PrintTemplateTeardown;
      ie.Quit();
    }
  }
}

1. 您可以通过添加对Microsoft Internet Controls"的引用来访问 SHDocVw 命名空间，该引用位于添加引用"对话框的 COM 选项卡上.
2. 有关 InternetExplorer 对象的更多信息，请访问 MSDN.
3. Navigate() 方法将加载 HTML 文件.其他参数允许您指定可选参数，例如标志和标题.
4. 在加载文档之前我们无法打印.在这里，我进入一个循环，等待 DocumentComplete 事件被调用，在此事件上设置一个标志，通知我们导航已完成.请注意，只要导航完成(成功或失败)，就会调用 DocumentComplete.
5. 设置 documentLoaded 标志后，将通过 QueryStatusWB() 查询打印状态，直到启用打印.
6. 打印是通过 ExecWB() 调用开始的.指定了 OLECMDID_PRINT 命令以及选项 OLECMDEXECOPT_DONTPROMPTUSER 以在无需用户交互的情况下自动打印.一个重要的注意事项是这将打印到默认打印机.要指定打印机，您必须设置默认打印机(在代码中，您可以调用 SetDefaultPrinter()).最后两个参数允许可选的输入和输出参数.
7. 我们不想在打印完成之前退出，因此再次进入一个循环.触发 PrintTemplateTeardown 事件后，将设置 documentPrinted 标志.然后可以清理对象.

1. You can access the SHDocVw namespace by adding a reference to 'Microsoft Internet Controls', found on the COM tab of the Add Reference dialog.
2. More information on the InternetExplorer object can be found on MSDN.
3. The Navigate() method will load the HTML file. The other parameters allow you to specify optional parameters, such as flags and headers.
4. We can't print until the document is loaded. Here, I enter a loop waiting until the DocumentComplete event is called, upon which a flag is set notifying us that navigation has completed. Note that DocumentComplete is called whenever navigation is finished - upon success or failure.
5. Once the documentLoaded flag is set, the printing status is queried via QueryStatusWB() until printing is enabled.
6. Printing is started with the ExecWB() call. The OLECMDID_PRINT command is specified, along with the option OLECMDEXECOPT_DONTPROMPTUSER to automatically print without user interaction. An important note is that this will print to the default printer. To specify a printer, you will have to set the default printer (in code, you could call SetDefaultPrinter()). The two final parameters allow optional input and output parameters.
7. We don't want to quit until printing is complete, so once again a loop is entered. After the PrintTemplateTeardown event is fired, the documentPrinted flag is set. The objects can then be cleaned up.

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