获取打印机信息

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace Print
{
    class PrintStatus
    {
        public static int oldPrintId = 0;

        [StructLayout(LayoutKind.Sequential)]
        public struct SYSTEMTIME
        {
            public short wYear;
            public short wMonth;
            public short wDayOfWeek;
            public short wDay;
            public short wHour;
            public short wMinute;
            public short wSecond;
            public short wMilliseconds;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct JOB_INFO_1
        {
            public int JobId;
            public string pPrinterName;
            public string pMachineName;
            public string pUserName;
            public string pDocument;
            public string pDatatype;
            public string pStatus;
            public int Status;
            public int Priority;
            public int Position;
            public int TotalPages;
            public int PagesPrinted;
            public SYSTEMTIME Submitted;
        }

        [DllImport("winspool.drv", CharSet = CharSet.Auto)]
        public static extern bool OpenPrinter(string pPrinterName, out IntPtr phPrinter, IntPtr pDefault);

        [DllImport("winspool.drv", CharSet = CharSet.Auto)]
        public static extern bool ClosePrinter(IntPtr hPrinter);

        [DllImport("winspool.drv", CharSet = CharSet.Auto)]
        public static extern int EnumJobs(IntPtr hPrinter, int FirstJob, int NoJobs, int Level, IntPtr pInfo, int cdBuf, out int pcbNeeded, out int pcReturned);

        public static void peekPrinterJobs(string printerToPeek)
        {
            IntPtr handle;
            int FirstJob = 0;
            int NumJobs = 127;
            int pcbNeeded;
            int pcReturned;

            // open printer  
            OpenPrinter(printerToPeek, out handle, IntPtr.Zero);

            // get num bytes required, here we assume the maxt job for the printer quest is 128 (0..127)  
            EnumJobs(handle, FirstJob, NumJobs, 1, IntPtr.Zero, 0, out pcbNeeded, out pcReturned);

            // allocate unmanaged memory  
            IntPtr pData = Marshal.AllocHGlobal(pcbNeeded);

            // get structs  
            EnumJobs(handle, FirstJob, NumJobs, 1, pData, pcbNeeded, out pcbNeeded, out pcReturned);

            // create array of managed job structs  
            JOB_INFO_1[] jobs = new JOB_INFO_1[pcReturned];

            // marshal struct to managed  
            int pTemp = pData.ToInt32(); //start pointer  
            for (int i = 0; i < pcReturned; ++i)
            {
                jobs[i] = (JOB_INFO_1)Marshal.PtrToStructure(new IntPtr(pTemp), typeof(JOB_INFO_1));
                string s = jobs[i].pPrinterName + "
" + jobs[i].pDocument + "
状态码：" + jobs[i].Status;
                //if (jobs[i].Status != 16) break;
                if (jobs[i].JobId == oldPrintId)
                {
                    // MessageBox.Show("bbb");
                    break;
                }
                else
                {
                    // MessageBox.Show("ccc");
                    pTemp += Marshal.SizeOf(typeof(JOB_INFO_1));
                    //记录到日志，可以自己写方法写到数据库或者其他地方 
                    RecordJobToLog(jobs[i]);
                    oldPrintId = jobs[i].JobId;
                }

            }

            Marshal.FreeHGlobal(pData);

            ClosePrinter(handle);

        }
        /// <summary>
        /// 获取打印任务
        /// </summary>
        /// <param name="printerToPeek">要查询的打印机任务的名称</param>
        /// <returns></returns>
        public static List<string> GetPrinterTask(string printerToPeek)
        {
            List<string> nameList = new List<string>();
            IntPtr handle;
            int FirstJob = 0;
            int NumJobs = 127;
            int pcbNeeded;
            int pcReturned;

            // open printer  
            OpenPrinter(printerToPeek, out handle, IntPtr.Zero);

            // get num bytes required, here we assume the maxt job for the printer quest is 128 (0..127)  
            EnumJobs(handle, FirstJob, NumJobs, 1, IntPtr.Zero, 0, out pcbNeeded, out pcReturned);

            // allocate unmanaged memory  
            IntPtr pData = Marshal.AllocHGlobal(pcbNeeded);

            // get structs  
            EnumJobs(handle, FirstJob, NumJobs, 1, pData, pcbNeeded, out pcbNeeded, out pcReturned);

            // create array of managed job structs  
            JOB_INFO_1[] jobs = new JOB_INFO_1[pcReturned];

            // marshal struct to managed  
            int pTemp = pData.ToInt32(); //start pointer  
            for (int i = 0; i < pcReturned; ++i)
            {
                jobs[i] = (JOB_INFO_1)Marshal.PtrToStructure(new IntPtr(pTemp), typeof(JOB_INFO_1));
                string s = jobs[i].pPrinterName + "	" + jobs[i].pDocument + "	状态码：" + jobs[i].Status;
                nameList.Add(s);
                //if (jobs[i].Status != 16) break;
                if (jobs[i].JobId == oldPrintId)
                {
                    // MessageBox.Show("bbb");
                    break;
                }
                else
                {
                    // MessageBox.Show("ccc");
                    pTemp += Marshal.SizeOf(typeof(JOB_INFO_1));
                    //记录到日志，可以自己写方法写到数据库或者其他地方 
                    RecordJobToLog(jobs[i]);
                    oldPrintId = jobs[i].JobId;
                }

            }

            Marshal.FreeHGlobal(pData);

            ClosePrinter(handle);
            return nameList;
        }


        private static void RecordJobToLog(JOB_INFO_1 job)
        {
            string logText = job.JobId + "-" + job.pMachineName + "-" + job.pUserName + "-" + job.pDocument + "-" + job.PagesPrinted + "-" + job.TotalPages + "-" + job.Status + "-" + DateTime.Now.ToString("yyyy-MM-dd HH:mm");
            Console.WriteLine(logText);
        }
    }
}