我需要開發一個應用程序來打印熱敏打印機，如Epson ESC / POS協議或ZPL Zebra協議 . 我可以使用網絡打印機，串口打印機以及窗口的假脫機打印機將原始代碼寫入打印機 . 當我需要“查詢”prnter以獲取其狀態(準備，錯誤，紙張結束等)時，我的麻煩開始了，在這種情況下我需要反向通信，我發送一個特殊命令，打印機回答一些狀態字節 . 一切都很清楚......使用網絡/插座打印機或串口打印機......用Windows打印機我無法理解如何讀取打印機狀態...

有什么解決方案嗎？

UPDATE

按照Hans的建議，我正在嘗試使用Windows API讀取打印機 . 這是我用ESC / POS協議測試的 .

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);

}

}

我確信“\ u0010 \ u0004 \ u0001”(DLE EOT 1)是在ESCPOS協議中請求打印機狀態的推薦，我用串行連接的同一臺打印機測試它，我得到一個狀態字節 .

但是使用上面的代碼，我總是從ReadPrinter方法得到錯誤 . 我檢查了打印機端口是否啟用了“雙向”選項，我也嘗試過沒有假脫機程序選項 .

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