C#擷取印表機狀態

public static string GetPrinterStatus(string PrinterName)    {    int intValue = GetPrinterStatusInt(PrinterName);    string strRet = string.Empty;    switch (intValue)    {    case 0:    strRet = "準備就緒（Ready）";    break;    case 0x00000200:    strRet = "忙(Busy）";    break;    case 0x00400000:    strRet = "被開啟（Printer Door Open）";    break;    case 0x00000002:    strRet = "錯誤(Printer Error）";    break;    case 0x0008000:    strRet = "初始化(Initializing）";    break;    case 0x00000100:    strRet = "正在輸入,輸出（I/O Active）";    break;    case 0x00000020:    strRet = "手工送紙（Manual Feed）";    break;    case 0x00040000:    strRet = "無墨粉（No Toner）";    break;    case 0x00001000:    strRet = "不可用（Not Available）";    break;    case 0x00000080:    strRet = "離線（Off Line）";    break;    case 0x00200000:    strRet = "記憶體溢出（Out of Memory）";    break;    case 0x00000800:    strRet = "輸出口已滿（Output Bin Full）";    break;    case 0x00080000:    strRet = "當前頁無法列印（Page Punt）";    break;    case 0x00000008:    strRet = "塞紙（Paper Jam）";    break;    case 0x00000010:    strRet = "列印紙用完（Paper Out）";    break;    case 0x00000040:    strRet = "紙張問題（Page Problem）";    break;    case 0x00000001:    strRet = "暫停（Paused）";    break;    case 0x00000004:    strRet = "正在刪除（Pending Deletion）";    break;    case 0x00000400:    strRet = "正在列印（Printing）";    break;    case 0x00004000:    strRet = "正在處理（Processing）";    break;    case 0x00020000:    strRet = "墨粉不足（Toner Low）";    break;    case 0x00100000:    strRet = "需要使用者幹預（User Intervention）";    break;    case 0x20000000:    strRet = "等待（Waiting）";    break;    case 0x00010000:    strRet = "熱機中（Warming Up）";    break;    default:    strRet = "未知狀態（Unknown Status）";    break;    }    return strRet;   }   internal static int GetPrinterStatusInt(string PrinterName)    {    int intRet = 0;    IntPtr hPrinter;    structPrinterDefaults defaults = new structPrinterDefaults();      if (OpenPrinter(PrinterName, out hPrinter, ref defaults))    {    int cbNeeded = 0;    bool bolRet = GetPrinter(hPrinter, 2, IntPtr.Zero, 0, out cbNeeded);    if (cbNeeded > 0)    {    IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);    bolRet = GetPrinter(hPrinter, 2, pAddr, cbNeeded, out cbNeeded);    if (bolRet)    {    PRINTER_INFO_2 Info2 = new PRINTER_INFO_2();        Info2 = (PRINTER_INFO_2)Marshal.PtrToStructure(pAddr, typeof(PRINTER_INFO_2));        intRet = System.Convert.ToInt32(Info2.Status);    }    Marshal.FreeHGlobal(pAddr);    }    ClosePrinter(hPrinter);    }      return intRet;    }    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]    internal struct structPrinterDefaults    {    [MarshalAs(UnmanagedType.LPTStr)]    public String pDatatype;    public IntPtr pDevMode;    [MarshalAs(UnmanagedType.I4)]    public int DesiredAccess;    };  狀態枚舉[FlagsAttribute]    internal enum PrinterStatus    {    PRINTER_STATUS_BUSY = 0x00000200,    PRINTER_STATUS_DOOR_OPEN = 0x00400000,    PRINTER_STATUS_ERROR = 0x00000002,    PRINTER_STATUS_INITIALIZING = 0x00008000,    PRINTER_STATUS_IO_ACTIVE = 0x00000100,    PRINTER_STATUS_MANUAL_FEED = 0x00000020,    PRINTER_STATUS_NO_TONER = 0x00040000,    PRINTER_STATUS_NOT_AVAILABLE = 0x00001000,    PRINTER_STATUS_OFFLINE = 0x00000080,    PRINTER_STATUS_OUT_OF_MEMORY = 0x00200000,    PRINTER_STATUS_OUTPUT_BIN_FULL = 0x00000800,    PRINTER_STATUS_PAGE_PUNT = 0x00080000,    PRINTER_STATUS_PAPER_JAM = 0x00000008,    PRINTER_STATUS_PAPER_OUT = 0x00000010,    PRINTER_STATUS_PAPER_PROBLEM = 0x00000040,    PRINTER_STATUS_PAUSED = 0x00000001,    PRINTER_STATUS_PENDING_DELETION = 0x00000004,    PRINTER_STATUS_PRINTING = 0x00000400,    PRINTER_STATUS_PROCESSING = 0x00004000,    PRINTER_STATUS_TONER_LOW = 0x00020000,    PRINTER_STATUS_USER_INTERVENTION = 0x00100000,    PRINTER_STATUS_WAITING = 0x20000000,    PRINTER_STATUS_WARMING_UP = 0x00010000    }