操作打印机任务，200分求代码！

Question

rt

Answer 1

        using System.Runtime.InteropServices;        unsafe struct PRINTER_DEFAULTS
        {
            public void* pDatatype;     // LPTSTR
            public void* pDevMode;      // LPDEVMODE
            public uint DesiredAccess; // ACCESS_MASK
        };        [DllImport("kernel32", SetLastError = true)]
        static extern int GetLastError();        [DllImport("WinSpool.drv", SetLastError = true)]
        static extern unsafe bool OpenPrinter
        (string pPrinterName, int* phPrinter, void* pDefault);        [DllImport("WinSpool.drv", SetLastError = true)]
        static extern bool ClosePrinter(int hPrinter);        [DllImport("WinSpool.drv", SetLastError = true)]
        static extern unsafe bool SetPrinter
        (int hPrinter, uint Level, void* pPrinter, uint Command);        const uint PRINTER_ACCESS_ADMINISTER = 0x00000004;
        const uint PRINTER_STATUS_OFFLINE = 0x00000080;
        const uint PRINTER_CONTROL_PAUSE = 1;
        const uint PRINTER_CONTROL_RESUME = 2;
        const uint PRINTER_CONTROL_PURGE = 3;
        const uint PRINTER_CONTROL_SET_STATUS = 4;        // Open a printer for administration operations.
        static unsafe int CSOpenPrinter(string printerName)
        {
            bool bResult;
            int hPrinter;
            PRINTER_DEFAULTS pd;            pd.pDatatype = null;
            pd.pDevMode = null;
            pd.DesiredAccess = PRINTER_ACCESS_ADMINISTER;            bResult = OpenPrinter(printerName, &hPrinter, &pd);
            if (!bResult)
            {
                throw new ApplicationException("Cannot open printer '" +
                                                printerName + "' " +
                                                Marshal.GetLastWin32Error());
            }
            return hPrinter;
        }        // Close the printer.
        static void CSClosePrinter(int hPrinter)
        {
            if (!ClosePrinter(hPrinter))
            {
                throw new ApplicationException("Cannot close printer " +
                                                Marshal.GetLastWin32Error());
            }
        }        // Pause printer.
        static unsafe void CSPausePrinter(int hPrinter)
        {
            if (!SetPrinter(hPrinter, 0, null, PRINTER_CONTROL_PAUSE))
            {
                throw new ApplicationException("Cannot pause printer " +
                                                Marshal.GetLastWin32Error());
            }
        }        // Delete printer.
        static unsafe void CSDeletePrinter(int hPrinter)
        {
            if (!SetPrinter(hPrinter, 0, null, PRINTER_CONTROL_PURGE))
            {
                throw new ApplicationException("Cannot delete printer " +
                                                Marshal.GetLastWin32Error());
            }
        }        // Resume printer.
        static unsafe void CSResumePrinter(int hPrinter)
        {
            if (!SetPrinter(hPrinter, 0, null, PRINTER_CONTROL_RESUME))
            {
                throw new ApplicationException("Cannot resume printer " +
                                                Marshal.GetLastWin32Error());
            }
        }        // Disable printer (offline).
        static unsafe void CSDisablePrinter(int hPrinter)
        {
            if (!SetPrinter(hPrinter, 0,
                           (byte*)PRINTER_STATUS_OFFLINE,
                            PRINTER_CONTROL_SET_STATUS))
            {
                throw new ApplicationException("Cannot disable printer " +
                                                Marshal.GetLastWin32Error());
            }
        }        // Enable printer.
        static unsafe void CSEnablePrinter(int hPrinter)
        {
            if (!SetPrinter(hPrinter, 0, (byte*)0, PRINTER_CONTROL_SET_STATUS))
            {
                throw new ApplicationException("Cannot enable printer " +
                                                Marshal.GetLastWin32Error());
            }
        }        //
        int hPrinter;
            try 
            {
                hPrinter = CSOpenPrinter("打印机名");
                CSPausePrinter(hPrinter);
                CSDeletePrinter(hPrinter);
                CSClosePrinter(hPrinter);
            }
            catch 
            {            }

Answer 2

[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);
OpenPrinter，用来获取给定打印机的句柄，通过该句柄可以实现对相应打印机的操作。            
EnumJobs，用来列出所指定打印机上正在打印的作业信息

Answer 3

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