PrinterHelper.cs
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using System;
using System.Runtime.InteropServices;
namespace BLL
{
public static class PrinterHelper
{
[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool OpenPrinter(string pPrinterName, out IntPtr hPrinter, IntPtr pDefault);
[DllImport("winspool.drv", SetLastError = true)]
private static extern bool ClosePrinter(IntPtr hPrinter);
[DllImport("winspool.drv", SetLastError = true)]
private static extern bool GetPrinter(IntPtr hPrinter, int dwLevel, IntPtr pPrinter, int cbBuf, out int pcbNeeded);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
private struct PRINTER_INFO
{
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;
}
public static string GetPrinterStatus(string PrinterName)
{
int intValue = GetPrinterStatusInt(PrinterName);
string strRet = intValue switch
{
0 => "准备就绪（Ready）",
0x00000200 => "忙(Busy）",
0x00400000 => "被打开（Printer Door Open）",
0x00000002 => "错误(Printer Error）",
0x00008000 => "初始化(Initializing）",
0x00000100 => "正在输入,输出（I/O Active）",
0x00000020 => "手工送纸（Manual Feed）",
0x00040000 => "无墨粉（No Toner）",
0x00001000 => "不可用（Not Available）",
0x00000080 => "脱机（Off Line）",
0x00200000 => "内存溢出（Out of Memory）",
0x00000800 => "输出口已满（Output Bin Full）",
0x00080000 => "当前页无法打印（Page Punt）",
0x00000008 => "塞纸（Paper Jam）",
0x00000010 => "打印纸用完（Paper Out）",
0x00000040 => "纸张问题（Page Problem）",
0x00000001 => "暂停（Paused）",
0x00000004 => "正在删除（Pending Deletion）",
0x00000400 => "正在打印（Printing）",
0x00004000 => "正在处理（Processing）",
0x00020000 => "墨粉不足（Toner Low）",
0x00100000 => "需要用户干预（User Intervention）",
0x20000000 => "等待（Waiting）",
0x00010000 => "热机中（Warming Up）",
_ => "未知状态（Unknown Status）",
};
return strRet;
}
private static int GetPrinterStatusInt(string PrinterName)
{
int result = 0;
bool rtn = OpenPrinter(PrinterName, out IntPtr hPrinter, IntPtr.Zero);
if (!rtn) return result;
GetPrinter(hPrinter, 2, IntPtr.Zero, 0, out int cbNeeded);
if (cbNeeded > 0)
{
IntPtr pAddr = Marshal.AllocHGlobal(cbNeeded);
rtn = GetPrinter(hPrinter, 2, pAddr, cbNeeded, out _);
if (rtn)
{
PRINTER_INFO info = (PRINTER_INFO)Marshal.PtrToStructure(pAddr, typeof(PRINTER_INFO));
result = Convert.ToInt32(info.Status);
}
Marshal.FreeHGlobal(pAddr);
}
ClosePrinter(hPrinter);
return result;
}
}
}