通过Windows驱动程序与热敏打印机进行双向通信

Question

我需要开发一个应用程序来打印热敏打印机，如Epson ESC / POS协议或ZPL Zebra协议。 我可以使用网络打印机，串口打印机以及窗口的假脱机打印机将原始代码写入打印机。 当我需要＆＃34;查询＆＃34; prnter获取其状态（准备，错误，纸张结束等），在这种情况下我需要反向通信，我发送一个特殊命令，打印机回答一些状态字节。 一切都很清楚......有了Windows打印机我无法理解如何阅读打印机状态......

有没有解决方案？

更新

根据Hans的建议，我尝试使用Windows API阅读打印机。这是我用ESC / POS协议测试的。

public class WinPrinter
{
    // Structure and API declarions:
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public class DOCINFOA
    {
        [MarshalAs(UnmanagedType.LPStr)]
        public string pDocName;
        [MarshalAs(UnmanagedType.LPStr)]
        public string pOutputFile;
        [MarshalAs(UnmanagedType.LPStr)]
        public string pDataType;
    }
    [DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);

    [DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool ClosePrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

    [DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool EndDocPrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool StartPagePrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool EndPagePrinter(IntPtr hPrinter);

    [DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);

    [DllImport("winspool.Drv", EntryPoint = "ReadPrinter", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
    public static extern bool ReadPrinter(IntPtr hPrinter, [MarshalAs(UnmanagedType.LPStr)] StringBuilder pBytes, Int32 dwCount, out Int32 dwNReadBytes); 

    public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
    {
        Int32 dwError = 0, dwWritten = 0;
        IntPtr hPrinter = new IntPtr(0);
        DOCINFOA di = new DOCINFOA();
        bool bSuccess = false; // Assume failure unless you specifically succeed.

        di.pDocName = "My C#.NET RAW Document";
        di.pDataType = "RAW";

        // Open the printer.
        if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
        {
            // Start a document.
            if (StartDocPrinter(hPrinter, 1, di))
            {
                // Start a page.
                if (StartPagePrinter(hPrinter))
                {
                    // Write your bytes.
                    bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
                    EndPagePrinter(hPrinter);
                }
                EndDocPrinter(hPrinter);
            }
            string reaDstrinG = "";
            Int32 buf = 0;
            Int32 pcRead;
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            bool read = ReadPrinter(hPrinter, sb.Append(reaDstrinG), buf, out pcRead);
            ClosePrinter(hPrinter);
        }
        // If you did not succeed, GetLastError may give more information
        // about why not.
        if (bSuccess == false)
        {
            dwError = Marshal.GetLastWin32Error();
        }
        return bSuccess;


      }

       static void Main(string[] args)
        {
            String test = "\u0010\u0004\u0001";
            IntPtr pBytes=Marshal.StringToCoTaskMemAnsi(test);
            Int32 dwCount = test.Length;
            WinPrinter.SendBytesToPrinter("BIXOLON SRP-350 (Copia 1)",pBytes,dwCount);
        }

    }

我确定＆＃34; \ u0010 \ u0004 \ u0001＆＃34; （DLE EOT 1）是在ESCPOS协议中请求打印机状态的推荐，我用串行连接的同一台打印机测试它，我得到了一个状态字节。

然而，使用上面的代码，我总是从ReadPrinter方法中得到错误。 我检查过打印机端口有＆＃34;双向＆＃34;选项已启用，我也尝试过没有假脱机程序选项。