Question

我尝试连接打印机，但状态始终显示错误。如何编码连接打印机。

namespace CustomFunction
{
    public class Custom
    {
        public Custom();

        public string PaperStatus();
        public string PrinterModel();
    }
}

namespace CustomPrinterStatusCheck
{
    public class Program
    { 

        private enum PrinterStatus
        {
            PaperPresent, 
            NearPaperEnd, //4
            paperAbsent, //5
            Error, // typically printer fault or not founds
            Default // have not do any check since kiosk is up
        }

        private static string resultSaveLocation = "";
        private static string applicationRunningMode = "";
        private static readonly ILog ApplicationExceptionLogger = LogManager.GetLogger("APP.ExceptionLogger");

        public static void Main(string[] args)
        {
            try
            {
                Bootstrap();

                string value = "";

                PrinterStatus currentStatus = GetPrinterPaperStatus();     

                switch (currentStatus)
                {
                    case PrinterStatus.Default:
                       value = "DFT";
                        break;
                    case PrinterStatus.NearPaperEnd:
                        value = "NPE";
                        break;
                    case PrinterStatus.paperAbsent:
                        value = "PRA";
                        break;
                    case PrinterStatus.PaperPresent:
                        value = "PRP";
                        break;
                    case PrinterStatus.Error:
                        value = "ERR";
                        break;
                }

                Console.WriteLine("Printer Status: " + currentStatus.ToString() + " Code:" + value);
                WriteResultToTextfile(value);
            }
            catch (Exception ex)
            {
                // display the result in console window
                Console.WriteLine(ex.Message);

                // write the exceptoin / error to log file
                ApplicationExceptionLogger.Error(ex);
            }
            finally
            {
                // display the result in console window
                Console.WriteLine("Operation completed");

                // if application is running in text mode, console window will 
                // not closed by itself
                if (applicationRunningMode == "TEST")
                {
                    Console.ReadLine();
                }
            }

        }

        /// <summary>
        /// clean the file content and write -1 to indicate the failure of validating user
        /// </summary>
        private static void WriteResultToTextfile(string textToWrite)
        {
            string filePath = System.AppDomain.CurrentDomain.BaseDirectory + resultSaveLocation;

            File.WriteAllText(filePath, textToWrite);
        }

        /// <summary>
        /// setting up the application
        /// </summary>
        private static void Bootstrap()
        {
            XmlConfigurator.Configure();

            resultSaveLocation = ConfigurationManager.AppSettings["ResultOutputLocation"].ToString();
            applicationRunningMode = ConfigurationManager.AppSettings["ApplicationRunningMode"].ToString();
        }

        /// <summary>
        /// function to query custom printer status 
        /// </summary>
        /// <returns></returns>
        private static PrinterStatus GetPrinterPaperStatus()
        {
            PrinterStatus currentPrinterStatus = PrinterStatus.Default;

            CustomFunction.Custom printer = new Custom();
            string printerStatus = printer.PaperStatus();

            if (printerStatus.Contains("0"))
            {
                currentPrinterStatus = PrinterStatus.PaperPresent;
            }
            else if (printerStatus.Contains("4"))
            {
                currentPrinterStatus = PrinterStatus.NearPaperEnd;
            }
            else if (printerStatus.Contains("5"))
            {
                currentPrinterStatus = PrinterStatus.paperAbsent;
            }
            else if (printerStatus.Contains("Error"))
            {
                currentPrinterStatus = PrinterStatus.Error;
            }

            return currentPrinterStatus;
        }



    }


}

Answer 1

这是一个很好的例子。

Welcome to this tutorial on Printing in C#

过去，用Microsoft语言打印文档很容易，并且在白天回来了。使用Visual Basic等语言，这是一个简单的Printer.Print调用。在那些日子里，用那种语言，我们会称之为文档并打印，但由于那不是面向对象的语言，我们无法控制任何东西。

快到多年，到2000年神奇的一年，微软推出了C＃。使用C＃，不再有用于打印文档的Printer.Print解决方案。由于C＃是面向对象的语言，您现在可以控制整个打印过程，从字体到字体大小，到页面方向（横向，纵向），到打印区域的大小（页面）大小），这当然需要程序员的一些工作部分。这就是本教程的目的，以及我每天至少问过一次如何完成这项任务的事实。

如何连接打印机

1 个答案: