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C#获取打印机状态,求大神指点

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悬赏园豆:15 [已关闭问题] 关闭于 2015-08-17 16:46

找到了一些方法获取打印机的状态,但是结果不对。

1.WMI的方式

 1 /// <summary>
 2 /// 获取打印机的当前状态
 3 /// </summary>
 4 /// <param name="PrinterDevice">打印机设备名称</param>
 5 /// <returns>打印机状态</returns>
 6 public static PrinterStatus GetPrinterStatus(string PrinterDevice)
 7 {
 8     PrinterStatus ret = 0;
 9     string path = @"win32_printer.DeviceId='" + PrinterDevice + "'";
10     ManagementObject printer = new ManagementObject(path);
11     printer.Get();
12     ret = (PrinterStatus)Convert.ToInt32(printer.Properties["PrinterStatus"].Value);
13     return ret;
14 }
Code

2.Windows API的方式

 1 [DllImport("winspool.Drv", EntryPoint = "OpenPrinter", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = false, CallingConvention = CallingConvention.StdCall), SuppressUnmanagedCodeSecurityAttribute()]
 2 internal static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPTStr)]string printerName, out IntPtr phPrinter, ref structPrinterDefaults pd);
 3 
 4 [DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = false, CallingConvention = CallingConvention.StdCall), SuppressUnmanagedCodeSecurityAttribute()]
 5 internal static extern bool ClosePrinter(IntPtr phPrinter);
 6 [DllImport("winspool.Drv", EntryPoint = "GetPrinterA", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
 7 internal static extern bool GetPrinter(IntPtr hPrinter, int dwLevel, IntPtr pPrinter, int dwBuf, out int dwNeeded);
 8 
 9 internal static int GetPrinterStatusInt(string PrinterName)
10 {
11     int intRet = 0;
12     IntPtr hPrinter;
13     structPrinterDefaults defaults = new structPrinterDefaults();
14 
15     if (OpenPrinter(PrinterName, out hPrinter, ref defaults))
16     {
17         int cbNeeded = 0;
18         bool bolRet = GetPrinter(hPrinter, 2, IntPtr.Zero, 0, out cbNeeded);
19         if (cbNeeded > 0)
20         {
21             IntPtr pAddr = Marshal.AllocHGlobal((int)cbNeeded);
22             bolRet = GetPrinter(hPrinter, 2, pAddr, cbNeeded, out cbNeeded);
23             if (bolRet)
24             {
25                 PRINTER_INFO_2 Info2 = new PRINTER_INFO_2();
26 
27                 Info2 = (PRINTER_INFO_2)Marshal.PtrToStructure(pAddr, typeof(PRINTER_INFO_2));
28 
29                 intRet = System.Convert.ToInt32(Info2.Status);
30             }
31             Marshal.FreeHGlobal(pAddr);
32         }
33         ClosePrinter(hPrinter);
34     }
35 
36     return intRet;
37 }
38 
39 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
40 internal struct structPrinterDefaults
41 {
42     [MarshalAs(UnmanagedType.LPTStr)]
43     public String pDatatype;
44     public IntPtr pDevMode;
45     [MarshalAs(UnmanagedType.I4)]
46     public int DesiredAccess;
47 };
48 
49 [StructLayout(LayoutKind.Sequential)]
50 internal struct PRINTER_INFO_2
51 {
52     public string pServerName;
53     public string pPrinterName;
54     public string pShareName;
55     public string pPortName;
56     public string pDriverName;
57     public string pComment;
58     public string pLocation;
59     public IntPtr pDevMode;
60     public string pSepFile;
61     public string pPrintProcessor;
62     public string pDatatype;
63     public string pParameters;
64     public IntPtr pSecurityDescriptor;
65     public uint Attributes;
66     public uint Priority;
67     public uint DefaultPriority;
68     public uint StartTime;
69     public uint UntilTime;
70     public uint Status;
71     public uint cJobs;
72     public uint AveragePPM;
73 }
Code

明明是脱机状态,以上方法得到的都是就绪的状态,求指点。

seayxu的主页 seayxu | 大侠五级 | 园豆:5468
提问于:2015-08-15 17:15
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所有回答(1)
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string path = @"win32_printer.DeviceId='" + printerDevice + "'";
ManagementObject printer = new ManagementObject(path);
printer.Get();
ret = !(printer["WorkOffline"].ToString().ToLower().Equals("true"));

紫星131 | 园豆:219 (菜鸟二级) | 2020-10-16 16:00
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