系统.打印跳过一些作业状态状态

Question

我正在向打印机发送打印作业，我试图跟踪它们的状态，以便在我自己的队列中反映它。

似乎打印作业从未经过"已打印"、"已完成"状态。

我做了一个小的测试程序，看看是否可能我使用。net对象的错误方式，但这仍然发生了。我运行我的测试程序来查询一个新的打印作业，一旦有了一个，我就对它进行了大量的轮询，并每次刷新以查看它的状态，并确保我没有错过任何东西。

PrintServer ps = new PrintServer(@"\printServer");
PrintQueue pq = new PrintQueue(ps, "PDF Writer - bioPDF");
PrintSystemJobInfo jobInfo = null;
while (jobInfo == null)
{
    pq.Refresh();
    var printJobs = pq.GetPrintJobInfoCollection(); 
    foreach (var printJob in printJobs)
    {
        printJob.Refresh();
        jobInfo = printJob;
        break;
    }
    Thread.Sleep(100);
}
PrintJobStatus jobStatus = PrintJobStatus.None;
PrintJobStatus prevJobStatus = PrintJobStatus.None;
while (true)
{
    try
    {
        jobInfo.Refresh();
    } catch { }
    prevJobStatus = jobStatus;
    jobStatus = jobInfo.JobStatus;
    if (jobStatus != prevJobStatus)
    {
        Console.WriteLine("**UPDATE**");
        SpotTroubleUsingProperties(jobInfo); // Microsoft example method that prints a description of each possible job status
    }
    Thread.Sleep(20);
}

我得到的结果，即使文档是打印的，是:

**UPDATE**
The job is spooling now.
**UPDATE**
The job is printing now.
**UPDATE**
The user or someone with administration rights to the queue has deleted the job. It must be resubmitted.

我如何知道文档处于"已完成"状态?

Answer 1

除非您启用打印机的"Keep列印文件"选项，否则您永远不会看到Completed状态，因为列印作业一旦完成就会被删除。转变为Printing-->Deleting,而不是Printing-->Completed-->Deleting

因此，您有两个可能的信号表示作业已经完成:1)当它进入Deleting状态时和2)当它从队列中消失时。据我所知，没有办法区分打印作业被删除是因为它完成了，还是因为某人或其他程序删除了它。

Answer 2

我只是在测试一个类似的情况，并得出以下日志输出，没有 'Keep列印文件'标志集:

Info: 11/24/2017 12:08:18 PM - JobStatus for document testA4.pdf is Printing, Retained.
Info: 11/24/2017 12:08:22 PM - JobStatus for document testA4.pdf changed from Printing, Retained to Retained.
Info: 11/24/2017 12:08:22 PM - JobStatus for document testA4.pdf changed from Retained to Completed, Retained.
Info: 11/24/2017 12:08:22 PM - Document testA4.pdf marked as Completed by printer.
Info: 11/24/2017 12:08:33 PM - JobStatus for document testA4.pdf changed from Completed, Retained to Deleted.

似乎与打印机/驱动程序有关。

用于获得此输出的代码:

public void MonitorPrintJobStatus(string printerName, Document document, CancellationToken token)
{
    using (var printServer = new LocalPrintServer())
    {
        using (var printQueue = printServer.GetPrintQueue(printerName))
        {
            foreach (var printJobInfo in printQueue.GetPrintJobInfoCollection())
            {
                if (printJobInfo.Name == document.DocumentToBePrinted.Path)
                {
                    bool printed = false;
                    var previousPrintJobStatus = printJobInfo.JobStatus;
                    _logger.LogInfo($"{DateTime.Now} - JobStatus for document {document.DocumentToBePrinted.Path} is {previousPrintJobStatus}.");
                    while (!token.IsCancellationRequested && !printed)
                    {
                        printJobInfo.Refresh();
                        if (previousPrintJobStatus != printJobInfo.JobStatus)
                        {
                            _logger.LogInfo($"{DateTime.Now} - JobStatus for document {document.DocumentToBePrinted.Path} changed from {previousPrintJobStatus} to {printJobInfo.JobStatus}.");
                            previousPrintJobStatus = printJobInfo.JobStatus;
                        }
                        if (printJobInfo.IsCompleted)
                        {
                            _logger.LogInfo($"{DateTime.Now} - Document {document.DocumentToBePrinted.Path} marked as Completed by printer.");
                            document.Status = DocumentPrintStatus.Printed;
                            printed = true;
                        }
                    }
                    break;
                }
            }
        }
    }
}