如何通过Printername和JobID暂停Win32_printJob

本文关键字:Win32 printJob 暂停 JobID 何通过 Printername | 更新日期: 2023-09-27 18:05:32

任务

当用户打印文档时,暂停弹出窗口将出现,然后填写表单,点击输入,表单将关闭,作业已恢复。

我们有50台网络打印机2000客户端机器一台打印服务器

每个客户有3或4台打印机

问题

如果用户在本地打印文档(例如:PDF PRINTER、XPS document WRITER((或(使用网络打印机,则打印作业立即暂停。

我的尝试

打印任何文档时,事件侦听器将监视并返回打印作业

  • 第一次暂停方法中,有时有效,但大多数时间无法正常工作。因为,它正在搜索打印作业,但它不在那里。

  • 第二次暂停方法不起作用因为,事件侦听器返回Managementbaseobject,但如果要暂停打印作业,则需要ManagementObject如何将ManageBaseObject转换为ManageObject

PRINTJOB事件侦听器代码

    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();

主要动作代码

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

暂停打印作业方法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;
            }

暂停打印作业方法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;
        } 

如何通过Printername和JobID暂停Win32_printJob

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

你可能会发现这些例子很有用。

最后,我在MSDN官方文档网站上找到了一个控制打印机的解决方案,下面是链接:https://www.codeproject.com/Articles/6592/A-Simple-Approach-for-Controlling-Print-Jobs-using

说明了如何对PauseResumeDelete进行打印作业。核心类是Win32_PrintJobprintJob的变量来自搜索到一个打印机实例的ManagementObjectSearcher对象。

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-对于新的打印作业

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)