如何用c#实现打印机脱机检查及阻塞打印

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打印机状态获取

enum PrinterStatus        {            其他 = 1,            未知 = 2,            空闲 = 3,            打印 = 4,            预热 = 5,            停止打印 = 6,            脱机 = 7,        }/// 
/// 获取打印机的当前状态/// 
/// 打印机设备名称/// 打印机状态private static PrinterStatus GetPrinterPrinterStatus(string PrinterDevice)        {            PrinterStatus ret = 0;string path = @"win32_printer.DeviceId='" + PrinterDevice + "'";            ManagementObject printer = new ManagementObject(path);            printer.Get();            ret = (PrinterStatus)Convert.ToInt32(printer.Properties["PrinterStatus"].Value);return ret;        }

打印机脱机检查

public static bool CheckPrinter(string BindPrintName)        {            ManagementScope scope = new ManagementScope(@"\root\cimv2");            scope.Connect();// Select Printers from WMI Object CollectionsManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_Printer");string printerName = "";foreach (ManagementObject printer in searcher.Get())            {                printerName = printer["Name"].ToString().ToLower();if (printerName.IndexOf(BindPrintName.ToLower()) > -1)                {//foreach (var property in printer.Properties)//{//    LogUtil.WriteLog(property.Name + ":" + property.Value);//}if (printer["WorkOffline"].ToString().ToLower().Equals("true"))                    {return false;                    }else{return true;                    }                }            }return false;        }

打印机阻塞队列实现

这里主要是通过一个while循环来不停的获取打印机的状态，空闲时才会进行下一次打印，通过两个标志位来配合轮询的外部介入退出

FinishWait标志位是任务内部的标识，如果打印机检查到了错误状态则进行轮询退出

GlobalInfo.IsGlobalExist标志位是程序全局标识，如果界面上通知用户等待时间过长，可以进行人工手动干预退出

//检查打印机状态if (!CheckPrinter(PrintName))                    {throw new PrintCheckException("打印机处于脱机状态");                    }                    PrinterStatus State = GetPrinterPrinterStatus(PrintName);if (State == PrinterStatus.空闲)                    {                    }else if (State == PrinterStatus.打印 || State == PrinterStatus.预热)                    {//正在打印/预热时循环去查询打印机状态，如果变成了就绪就开始打印while (State != PrinterStatus.空闲 && !FinishWait && !GlobalInfo.IsGlobalExist)                        {                            State = GetPrinterPrinterStatus(PrintName);if (!CheckPrinter(PrintName))                            {                                FinishWait = true;throw new PrintCheckException("打印机处于脱机状态");                            }if (State == PrinterStatus.打印 || State == PrinterStatus.预热 || State == PrinterStatus.空闲)                            {if (State == PrinterStatus.空闲)                                {                                    FinishWait = true;                                }                            }else{                                FinishWait = true;throw new PrintCheckException("打印机状态错误，当前状态：" + State.ToString());                            }                        }

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