关于win32_printer返回值的问题

Question

大家好，以下是判断打印机状态的，参照网上的文章写得，现在能够正常获取的状态是：空闲、正在打印。但是当我打印机关机或者Error状态时，仍是返回空闲，这是为什么呢？谢谢。

    public enum PrinterStatus
    {
      其他状态 = 1,
      未知,
      空闲,
      正在打印,
      预热,
      停止打印,
      打印中,
      离线
    }

    /// <summary>
    /// 获取打印机的当前状态
    /// </summary>
    /// <param name="PrinterDevice">打印机设备名称</param>
    /// <returns>打印机状态</returns>
    public static PrinterStatus GetPrinterStatus(string PrinterDevice)
    {
      PrinterStatus ret = 0;
      string path = @"win32_printer.DeviceId='" + PrinterDevice + "'";
      ManagementObject printer = new ManagementObject(path);
      printer.Get();
      ret = (PrinterStatus)Convert.ToInt32(printer.Properties["PrinterStatus"].Value);
      return ret;
    }

Answer 1

看来是比较复杂的问题。。。。汗了。。。

Answer 2

Hi 星际，

欢迎来到MSDN论坛。
您的帖子还可以再次编辑，请在打开编辑窗口之后找到最右边的工具按钮“插入代码块”，在弹出窗口中选择“C#”。
这样重写编辑之后方便论坛的大侠和朋友们帮助你解决问题。

Sincerely，
Leo Liu

---

Leo Liu [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
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Answer 3

哈，一直没发现有这个功能，谢谢

Answer 4

Hi 星际，

给ManagementObject对象加上using块试试：
        static PrinterStatus GetPrinterStat(string printerDevice)

        {

            PrinterStatus ret = 0;

            string path = "win32_printer.DeviceId='" + printerDevice + "'";

            using (ManagementObject printer = new ManagementObject(path))

            {

                printer.Get();

                ret = (PrinterStatus)Convert.ToInt32(printer.Properties["PrinterStatus"].Value);

            }

            return ret;

        }

Sincerely,
Leo Liu

---

Leo Liu [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.