这篇文章主要介绍“如何用c#实现打印机脱机检查及阻塞打印”,在日常操作中,相信很多人在如何用c#实现打印机脱机检查及阻塞打印问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”如何用c#实现打印机脱机检查及阻塞打印”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
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,
}/// <summary>/// 获取打印机的当前状态/// </summary>/// <param name="PrinterDevice">打印机设备名称</param>/// <returns>打印机状态</returns>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());
}
}
到此,关于“如何用c#实现打印机脱机检查及阻塞打印”的学习就结束了,希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习,快去试试吧!若想继续学习更多相关知识,请继续关注天达云网站,小编会继续努力为大家带来更多实用的文章!