C# Winform 打印

分类:DotNet    发布时间:2015-9-29 11:11:03

http://msdn.microsoft.com/zh-cn/library/aa394363.aspx

 

1. 设置默认打印机

复制代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Printers
{
    class Externs
    {
        [DllImport("winspool.drv")]
        public static extern bool SetDefaultPrinter(String Name); //调用win api将指定名称的打印机设置为默认打印机
    }
}
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2. 遍历所有打印机

foreach (object installedPrinter in PrinterSettings.InstalledPrinters)
{
    string printer = installedPrinter.ToString();
    cbxPrinter.Items.Add(printer);
}
cbxPrinter.SelectedItem = Properties.Settings.Default.PrinterName;

 3. 获取打印机状态

复制代码
string query = string.Format("SELECT * from Win32_Printer ");
var searcher = new ManagementObjectSearcher(query);
var printerzs = searcher.Get();
StringBuilder sb = new StringBuilder();
foreach (var printer in printerzs)
{
    sb.AppendLine(printer.Properties["Name"].Value.ToString());

    foreach (var property in printer.Properties)
    {
        sb.AppendLine(string.Format("\t{0}: {1}", property.Name, property.Value));
    }
    sb.AppendLine();
}

string r = sb.ToString();
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 4. 打印机类。

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using System;
using System.Collections.Generic;
using System.Drawing.Printing;
using System.Linq;
using System.Management;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;

namespace MicroEnginePrint.Core
{
    public class Printer
    {
        /// <summary>
        /// 获取打印机状态,是否离线。
        /// </summary>
        /// <param name="printerName"></param>
        /// <returns></returns>
        public static bool WorkOffline(string printerName)
        {
            string query = string.Format("SELECT * from Win32_Printer ");
            var searcher = new ManagementObjectSearcher(query);
            var printerzs = searcher.Get();
            foreach (var printer in printerzs)
            {
                string printername = printer.Properties["Name"].Value.ToString();
                if (printername == printerName)
                {
                    string workOffline = printer.Properties["WorkOffline"].Value.ToString().ToLower();
                    return workOffline != "false";
                }
            }
            return false;
        }

        private Printer()
        {
        }

        #region API声明

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        internal struct structPrinterDefaults
        {
            [MarshalAs(UnmanagedType.LPTStr)]
            public String pDatatype;
            public IntPtr pDevMode;
            [MarshalAs(UnmanagedType.I4)]
            public int DesiredAccess;
        };

        [DllImport("winspool.Drv", EntryPoint = "OpenPrinter", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = false, CallingConvention = CallingConvention.StdCall),
        SuppressUnmanagedCodeSecurity()]
        internal static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPTStr)] 
            string printerName,
            out IntPtr phPrinter,
            ref structPrinterDefaults pd);

        [DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = false,
             CallingConvention = CallingConvention.StdCall), SuppressUnmanagedCodeSecurity()]
        internal static extern bool ClosePrinter(IntPtr phPrinter);

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        internal struct structSize
        {
            public Int32 width;
            public Int32 height;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        internal struct structRect
        {
            public Int32 left;
            public Int32 top;
            public Int32 right;
            public Int32 bottom;
        }

        [StructLayout(LayoutKind.Explicit, CharSet = CharSet.Unicode)]
        internal struct FormInfo1
        {
            [FieldOffset(0), MarshalAs(UnmanagedType.I4)]
            public uint Flags;
            [FieldOffset(4), MarshalAs(UnmanagedType.LPWStr)]
            public String pName;
            [FieldOffset(8)]
            public structSize Size;
            [FieldOffset(16)]
            public structRect ImageableArea;
        };

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        internal struct structDevMode
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public String
dmDeviceName;
            [MarshalAs(UnmanagedType.U2)]
            public short dmSpecVersion;
            [MarshalAs(UnmanagedType.U2)]
            public short dmDriverVersion;
            [MarshalAs(UnmanagedType.U2)]
            public short dmSize;
            [MarshalAs(UnmanagedType.U2)]
            public short dmDriverExtra;
            [MarshalAs(UnmanagedType.U4)]
            public int dmFields;
            [MarshalAs(UnmanagedType.I2)]
            public short dmOrientation;
            [MarshalAs(UnmanagedType.I2)]
            public short dmPaperSize;
            [MarshalAs(UnmanagedType.I2)]
            public short dmPaperLength;
            [MarshalAs(UnmanagedType.I2)]
            public short dmPaperWidth;
            [MarshalAs(UnmanagedType.I2)]
            public short dmScale;
            [MarshalAs(UnmanagedType.I2)]
            public short dmCopies;
            [MarshalAs(UnmanagedType.I2)]
            public short dmDefaultSource;
            [MarshalAs(UnmanagedType.I2)]
            public short dmPrintQuality;
            [MarshalAs(UnmanagedType.I2)]
            public short dmColor;
            [MarshalAs(UnmanagedType.I2)]
            public short dmDuplex;
            [MarshalAs(UnmanagedType.I2)]
            public short dmYResolution;
            [MarshalAs(UnmanagedType.I2)]
            public short dmTTOption;
            [MarshalAs(UnmanagedType.I2)]
            public short dmCollate;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public String dmFormName;
            [MarshalAs(UnmanagedType.U2)]
            public short dmLogPixels;
            [MarshalAs(UnmanagedType.U4)]
            public int dmBitsPerPel;
            [MarshalAs(UnmanagedType.U4)]
            public int dmPelsWidth;
            [MarshalAs(UnmanagedType.U4)]
            public int dmPelsHeight;
            [MarshalAs(UnmanagedType.U4)]
            public int dmNup;
            [MarshalAs(UnmanagedType.U4)]
            public int dmDisplayFrequency;
            [MarshalAs(UnmanagedType.U4)]
            public int dmICMMethod;
            [MarshalAs(UnmanagedType.U4)]
            public int dmICMIntent;
            [MarshalAs(UnmanagedType.U4)]
            public int dmMediaType;
            [MarshalAs(UnmanagedType.U4)]
            public int dmDitherType;
            [MarshalAs(UnmanagedType.U4)]
            public int dmReserved1;
            [MarshalAs(UnmanagedType.U4)]
            public int dmReserved2;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        internal struct PRINTER_INFO_9
        {
            public IntPtr pDevMode;
        }

        [DllImport("winspool.Drv", EntryPoint = "AddFormW", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = true,
             CallingConvention = CallingConvention.StdCall), SuppressUnmanagedCodeSecurity()]
        internal static extern bool AddForm(
         IntPtr phPrinter,
            [MarshalAs(UnmanagedType.I4)] int level,
         ref FormInfo1 form);

        [DllImport("winspool.Drv", EntryPoint = "DeleteForm", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = false, CallingConvention = CallingConvention.StdCall),
        SuppressUnmanagedCodeSecurity()]
        internal static extern bool DeleteForm(
         IntPtr phPrinter,
            [MarshalAs(UnmanagedType.LPTStr)] string pName);

        [DllImport("kernel32.dll", EntryPoint = "GetLastError", SetLastError = false,
             ExactSpelling = true, CallingConvention = CallingConvention.StdCall),
        SuppressUnmanagedCodeSecurity()]
        internal static extern Int32 GetLastError();

        [DllImport("GDI32.dll", EntryPoint = "CreateDC", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = false,
             CallingConvention = CallingConvention.StdCall),
        SuppressUnmanagedCodeSecurity()]
        internal static extern IntPtr CreateDC([MarshalAs(UnmanagedType.LPTStr)] 
            string pDrive,
            [MarshalAs(UnmanagedType.LPTStr)] string pName,
            [MarshalAs(UnmanagedType.LPTStr)] string pOutput,
            ref structDevMode pDevMode);

        [DllImport("GDI32.dll", EntryPoint = "ResetDC", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = false,
             CallingConvention = CallingConvention.StdCall),
        SuppressUnmanagedCodeSecurity()]
        internal static extern IntPtr ResetDC(
         IntPtr hDC,
         ref structDevMode
            pDevMode);

        [DllImport("GDI32.dll", EntryPoint = "DeleteDC", SetLastError = true,
             CharSet = CharSet.Unicode, ExactSpelling = false,
             CallingConvention = CallingConvention.StdCall),
        SuppressUnmanagedCodeSecurity()]
        internal static extern bool DeleteDC(IntPtr hDC);

        [DllImport("winspool.Drv", EntryPoint = "SetPrinterA", SetLastError = true,
            CharSet = CharSet.Auto, ExactSpelling = true,
            CallingConvention = CallingConvention.StdCall), SuppressUnmanagedCodeSecurity()]
        internal static extern bool SetPrinter(
           IntPtr hPrinter,
           [MarshalAs(UnmanagedType.I4)] int level,
           IntPtr pPrinter,
           [MarshalAs(UnmanagedType.I4)] int command);

        /* 
         LONG DocumentProperties( 
           HWND hWnd,               // handle to parent window  
           HANDLE hPrinter,         // handle to printer object 
           LPTSTR pDeviceName,      // device name 
           PDEVMODE pDevModeOutput, // modified device mode 
           PDEVMODE pDevModeInput,  // original device mode 
           DWORD fMode              // mode options 
           ); 
         */
        [DllImport("winspool.Drv", EntryPoint = "DocumentPropertiesA", SetLastError = true,
        ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        internal static extern int DocumentProperties(
           IntPtr hwnd,
           IntPtr hPrinter,
           [MarshalAs(UnmanagedType.LPStr)] string pDeviceName,
           IntPtr pDevModeOutput,
           IntPtr pDevModeInput,
           int fMode
           );

        [DllImport("winspool.Drv", EntryPoint = "GetPrinterA", SetLastError = true,
        ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
        internal static extern bool GetPrinter(
           IntPtr hPrinter,
           int dwLevel,
           IntPtr pPrinter,
           int dwBuf,
           out int dwNeeded
           );

        [Flags]
        internal enum SendMessageTimeoutFlags : uint
        {
            SMTO_NORMAL = 0x0000,
            SMTO_BLOCK = 0x0001,
            SMTO_ABORTIFHUNG = 0x0002,
            SMTO_NOTIMEOUTIFNOTHUNG = 0x0008
        }
        const int WM_SETTINGCHANGE = 0x001A;
        const int HWND_BROADCAST = 0xffff;

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        internal static extern IntPtr SendMessageTimeout(
           IntPtr windowHandle,
           uint Msg,
           IntPtr wParam,
           IntPtr lParam,
           SendMessageTimeoutFlags flags,
           uint timeout,
           out IntPtr result
           );

        //EnumPrinters用到的函数和机构体 
        [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern bool EnumPrinters(PrinterEnumFlags Flags, string Name, uint Level,
            IntPtr pPrinterEnum, uint cbBuf,
        ref uint pcbNeeded, ref uint pcReturned);

        [StructLayout(LayoutKind.Sequential)]
        internal struct PRINTER_INFO_2
        {
            public string pServerName;
            public string pPrinterName;
            public string pShareName;
            public string pPortName;
            public string pDriverName;
            public string pComment;
            public string pLocation;
            public IntPtr pDevMode;
            public string pSepFile;
            public string pPrintProcessor;
            public string pDatatype;
            public string pParameters;
            public IntPtr pSecurityDescriptor;
            public uint Attributes;
            public uint Priority;
            public uint DefaultPriority;
            public uint StartTime;
            public uint UntilTime;
            public uint Status;
            public uint cJobs;
            public uint AveragePPM;
        }

        [Flags]
        internal enum PrinterEnumFlags
        {
            PRINTER_ENUM_DEFAULT = 0x00000001,
            PRINTER_ENUM_LOCAL = 0x00000002,
            PRINTER_ENUM_CONNECTIONS = 0x00000004,
            PRINTER_ENUM_FAVORITE = 0x00000004,
            PRINTER_ENUM_NAME = 0x00000008,
            PRINTER_ENUM_REMOTE = 0x00000010,
            PRINTER_ENUM_SHARED = 0x00000020,
            PRINTER_ENUM_NETWORK = 0x00000040,
            PRINTER_ENUM_EXPAND = 0x00004000,
            PRINTER_ENUM_CONTAINER = 0x00008000,
            PRINTER_ENUM_ICONMASK = 0x00ff0000,
            PRINTER_ENUM_ICON1 = 0x00010000,
            PRINTER_ENUM_ICON2 = 0x00020000,
            PRINTER_ENUM_ICON3 = 0x00040000,
            PRINTER_ENUM_ICON4 = 0x00080000,
            PRINTER_ENUM_ICON5 = 0x00100000,
            PRINTER_ENUM_ICON6 = 0x00200000,
            PRINTER_ENUM_ICON7 = 0x00400000,
            PRINTER_ENUM_ICON8 = 0x00800000,
            PRINTER_ENUM_HIDE = 0x01000000
        }

        //打印机状态 
        [Flags]
        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
        }

        //GetDefaultPrinter用到的API函数说明 
        [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern bool GetDefaultPrinter(StringBuilder pszBuffer, ref int size);

        //SetDefaultPrinter用到的API函数声明 
        [DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern bool SetDefaultPrinter(string Name);

        //EnumFormsA用到的函数声明,应该和EnumPrinters类似 
        [DllImport("winspool.drv", EntryPoint = "EnumForms")]
        internal static extern int EnumFormsA(IntPtr hPrinter, int Level, ref byte pForm, int cbBuf, ref int pcbNeeded, ref int pcReturned);

        #endregion

        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;
        }

        internal static PRINTER_INFO_2[] EnumPrintersByFlag(PrinterEnumFlags Flags)
        {
            uint cbNeeded = 0;
            uint cReturned = 0;
            bool ret = EnumPrinters(PrinterEnumFlags.PRINTER_ENUM_LOCAL, null, 2, IntPtr.Zero, 0, ref cbNeeded, ref cReturned);

            IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);
            ret = EnumPrinters(PrinterEnumFlags.PRINTER_ENUM_LOCAL, null, 2, pAddr, cbNeeded, ref cbNeeded, ref cReturned);

            if (ret)
            {
                PRINTER_INFO_2[] Info2 = new PRINTER_INFO_2[cReturned];

                int offset = pAddr.ToInt32();

                for (int i = 0; i < cReturned; i++)
                {
                    Info2[i].pServerName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pPrinterName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pShareName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pPortName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pDriverName = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pComment = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pLocation = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pDevMode = Marshal.ReadIntPtr(new IntPtr(offset));
                    offset += 4;
                    Info2[i].pSepFile = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pPrintProcessor = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pDatatype = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pParameters = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(new IntPtr(offset)));
                    offset += 4;
                    Info2[i].pSecurityDescriptor = Marshal.ReadIntPtr(new IntPtr(offset));
                    offset += 4;
                    Info2[i].Attributes = (uint)Marshal.ReadIntPtr(new IntPtr(offset));
                    offset += 4;
                    Info2[i].Priority = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].DefaultPriority = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].StartTime = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].UntilTime = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].Status = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].cJobs = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;
                    Info2[i].AveragePPM = (uint)Marshal.ReadInt32(new IntPtr(offset));
                    offset += 4;

                }

                Marshal.FreeHGlobal(pAddr);

                return Info2;
            }
            else
            {
                return new PRINTER_INFO_2[0];
            }
        }

        /// <summary> 
        /// 获取当前指定打印机的状态 
        /// </summary> 
        /// <param name="PrinterName">打印机名称</param> 
        /// <returns>打印机状态描述</returns> 
        public static string GetPrinterStatus(string PrinterName)
        {
            int intValue = GetPrinterStatusInt(PrinterName);
            string strRet = string.Empty;
            switch (intValue)
            {
                case 0:
                    strRet = "准备就绪(Ready)";
                    break;
                case 0x00000200:
                    strRet = "忙(Busy)";
                    break;
                case 0x00400000:
                    strRet = "门被打开(Printer Door Open)";
                    break;
                case 0x00000002:
                    strRet = "错误(Printer Error)";
                    break;
                case 0x0008000:
                    strRet = "正在初始化(Initializing)";
                    break;
                case 0x00000100:
                    strRet = "正在输入或输出(I/O Active)";
                    break;
                case 0x00000020:
                    strRet = "手工送纸(Manual Feed)";
                    break;
                case 0x00040000:
                    strRet = "无墨粉(No Toner)";
                    break;
                case 0x00001000:
                    strRet = "不可用(Not Available)";
                    break;
                case 0x00000080:
                    strRet = "脱机(Off Line)";
                    break;
                case 0x00200000:
                    strRet = "内存溢出(Out of Memory)";
                    break;
                case 0x00000800:
                    strRet = "输出口已满(Output Bin Full)";
                    break;
                case 0x00080000:
                    strRet = "当前页无法打印(Page Punt)";
                    break;
                case 0x00000008:
                    strRet = "塞纸(Paper Jam)";
                    break;
                case 0x00000010:
                    strRet = "打印纸用完(Paper Out)";
                    break;
                case 0x00000040:
                    strRet = "纸张问题(Page Problem)";
                    break;
                case 0x00000001:
                    strRet = "暂停(Paused)";
                    break;
                case 0x00000004:
                    strRet = "正在删除(Pending Deletion)";
                    break;
                case 0x00000400:
                    strRet = "正在打印(Printing)";
                    break;
                case 0x00004000:
                    strRet = "正在处理(Processing)";
                    break;
                case 0x00020000:
                    strRet = "墨粉不足(Toner Low)";
                    break;
                case 0x00100000:
                    strRet = "需要用户干预(User Intervention)";
                    break;
                case 0x20000000:
                    strRet = "等待(Waiting)";
                    break;
                case 0x00010000:
                    strRet = "正在准备(Warming Up)";
                    break;
                default:
                    strRet = "未知状态(Unknown Status)";
                    break;
            }
            return strRet;
        }

        /// <summary> 
        /// 获取本地打印机列表 
        /// 可以通过制定参数获取网络打印机 
        /// </summary> 
        /// <returns>打印机列表</returns> 
        public static List<string> GetPrinterList()
        {
            List<string> list = new List<string>();
            PRINTER_INFO_2[] Info2 = EnumPrintersByFlag(PrinterEnumFlags.PRINTER_ENUM_LOCAL);
            for (int i = 0; i < Info2.Length; i++)
            {
                list.Add(Info2[i].pPrinterName);
            }
            return list;
        }

        /// <summary>
        /// 获取安装的打印机
        /// </summary>
        /// <returns></returns>
        public static List<string> GetInstalledPrinters()
        {
            List<string> printers = new List<string>();
            foreach (object installedPrinter in PrinterSettings.InstalledPrinters)
            {
                string printer = installedPrinter.ToString();
                printers.Add(printer);
            }
            return printers;
        }

        /// <summary> 
        /// 获取本机的默认打印机名称 
        /// </summary> 
        /// <returns>默认打印机名称</returns> 
        public static string GetDeaultPrinterName()
        {
            StringBuilder dp = new StringBuilder(256);
            int size = dp.Capacity;
            if (GetDefaultPrinter(dp, ref size))
            {
                return dp.ToString();
            }
            else
            {
                int rc = GetLastError();
                return string.Empty;
            }
        }

        /// <summary> 
        /// 设置默认打印机 
        /// </summary> 
        /// <param name="PrinterName">可用的打印机名称</param> 
        public static void SetPrinterToDefault(string PrinterName)
        {
            SetDefaultPrinter(PrinterName);
        }

        ///// <summary> 
        ///// 判断打印机是否在系统可用的打印机列表中 
        ///// </summary> 
        ///// <param name="PrinterName">打印机名称</param> 
        ///// <returns>是:在;否:不在</returns> 
        public static bool PrinterInList(string PrinterName)
        {
            List<string> alPrinters = GetPrinterList();
            bool bolRet = alPrinters.Cast<object>().Any(t => PrinterName == t.ToString());
            alPrinters.Clear();
            return bolRet;
        }
    }
}

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