* 12345678所生成的ZPL指令如下: 

^ XA
^ FO50,50
^ A0N,36,20
^ FD12345678 ^ FS
^ PQ1,0,1,Y
^ XZ

注釋:
^XA/^XZ 分別代表ZPL的開始與結(jié)束, 始終固定
^FO :代表字段的起始位置, 50,50代表具體的坐標位置
^AON,36,20: 可縮放/位圖字體 O代表字體, N代表字段的方向, 36代表字符的高度,20代表寬度
^FD12345678^FS: 字符內(nèi)容, 代表輸出的字符 12345678 標準以^FS結(jié)束
^PQ1，0，1，Y: 打印數(shù)量, 1打印數(shù)量，0暫停和切紙值,1每個序列號的副本數(shù),Y代表覆蓋暫停計數(shù)

//ZPL命令測試方法
        public bool PrintZPL(string zpl)
        {
            return SendStringToPrinter("ZDesigner R110Xi4 300 dpi", zpl);
        }

  注:  ZDesigner R110Xi4 300 dpi 是打印機的名稱

        /// <summary>
        /// 內(nèi)容打印
        /// </summary>
        /// <param name="szPrinterName">打印機名稱</param>
        /// <param name="szString">打印的SBPL指令</param>
        /// <returns></returns>
        public bool SendStringToPrinter(string szPrinterName, string szString)
        {
            IntPtr pBytes;
            int dwCount;
            dwCount = szString.Length;
            pBytes = Marshal.StringToCoTaskMemAnsi(szString);
            SendBytesToPrinter(szPrinterName, pBytes, dwCount);
            Marshal.FreeCoTaskMem(pBytes);
            return true;
        }

        // 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, int 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);

        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 = "labelprint";
            di.pDataType = "RAW";

            // Open the printer.
            if (OpenPrinter(szPrinterName, out hPrinter, 0))
            {
                // 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);
                }
                ClosePrinter(hPrinter);
            }
            // If you did not succeed, GetLastError may give more information
            // about why not.
            if (bSuccess == false)
            {
                dwError = Marshal.GetLastWin32Error();
            }
            return bSuccess;
        }

        /// <summary>
        /// 測試ZPL命令執(zhí)行
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_print_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txt_zpl.Text)) return;

            SendStringToPrinte("ZDesigner R110Xi4 300 dpi",txt_zpl.Text); 
        }

        public static bool SendStringToPrinter(string szPrinterName, string szString)
        {
            IntPtr pBytes;
            Int32 dwCount;
            dwCount = szString.Length;
            pBytes = Marshal.StringToCoTaskMemAnsi(szString);
            SendBytesToPrinter(szPrinterName, pBytes, dwCount);
            Marshal.FreeCoTaskMem(pBytes);
            return true;
        }