Question

TASK

当用户打印文档时，暂停弹出将出现然后填写表单单击输入表单将关闭并且作业已恢复。

我们有 50台网络打印机， 2000客户端计算机和一台打印服务器。

每个客户都有 3或4台打印机

问题

如果用户使用网络打印机（CANON，HP）在本地打印文档（EX：PDF打印机，XPS文档编写者）（或），打印作业立即生效PAUSE。

MY TRIES

当打印任何文档时，事件监听器正在观看并返回打印作业。

在第一个暂停方法中，有时会工作，而且大部分时间都无法正常工作。因为它正在搜索printjob，但它已经打印过了。
< / LI>
在第二个暂停方法不起作用因为，事件侦听器返回Managementbaseobject但是如果要暂停打印作业需要ManagementObject 如何将ManageBaseObject转换为ManageObject < /强>

PRINTJOB EVENT LISTENER CODE

managementEvent = new ManagementEventWatcher(); managementEvent.Query = new EventQuery("SELECT * FROM __InstanceCreationEvent WITHIN 0.1 WHERE TargetInstance ISA 'Win32_PrintJob'"); managementEvent.Scope = new ManagementScope(@"\root\cimv2"); managementEvent.EventArrived += new EventArrivedEventHandler(printJobArrived_EventArrived); managementEvent.Start();


主要行动守则

private void printJobArrived_EventArrived(object sender, EventArrivedEventArgs e) { try { CurrentprintJob = (ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value; } catch(Exception ex){ } }


暂停PRINTJOB方法1

public bool PausePrintJob(string jobname) { bool isActionPerformed = false; try { string searchQuery = "SELECT * FROM Win32_PrintJob WHERE Name LIKE '%"+jobname+"%'"; ManagementObjectSearcher searchPrintJobs = new ManagementObjectSearcher(searchQuery); ManagementObjectCollection prntJobCollection = searchPrintJobs.Get(); foreach (ManagementObject prntJob in prntJobCollection) { prntJob.InvokeMethod("Pause", null); isActionPerformed = true; } } catch (Exception ex) { new LogFile().WriteErrorLog(ex.StackTrace, ex.Message); } return isActionPerformed; }


暂停PRINTJOB方法2

public bool PausePrintJob(ManagementObject currentPrintJob, bool makePause) { bool isActionPerformed = false; try { { if (makePause == true && currentPrintJob != null) { currentPrintJob.InvokeMethod("Pause", null); isActionPerformed = true; } else if (makePause == true && currentPrintJob != null) { currentPrintJob.InvokeMethod("Resume", null); isActionPerformed = false; } } } catch (Exception ex) { new LogFile().WriteErrorLog(ex.StackTrace, ex.Message); } return isActionPerformed; }

Answer 1

WMI太慢了。您可能需要使用FindFirstPrinterChangeNotification和FindNextPrinterChangeNotification。

您可能会发现these examples useful。

Answer 2

最后，我在MSDN官方文档网站上找到了用于控制打印机的解决方案，这是链接： https://www.codeproject.com/Articles/6592/A-Simple-Approach-for-Controlling-Print-Jobs-using

它显示了如何Pause，Resume和Delete打印作业。核心类是Win32_PrintJob。 printJob的变量来自ManagementObjectSearcher对象，该对象搜索一个打印机实例。

printJob.InvokeMethod("Pause", null);
printJob.InvokeMethod("Resume", null);
printJob.Delete()

我仍然发现它的Python实现代码： http://timgolden.me.uk/python/wmi/cookbook.html#watch-for-new-print-jobs

import wmi
c = wmi.WMI ()

print_job_watcher = c.Win32_PrintJob.watch_for (
  notification_type="Creation",
  delay_secs=1
)

while 1:
  pj = print_job_watcher ()
  print "User %s has submitted %d pages to printer %s" % \
    (pj.Owner, pj.TotalPages, pj.Name)

如何通过Printername和JobID暂停Win32_printJob

2 个答案: