Question

以下是通过串口发送ZPL命令的C＃功能。 ZPL命令以~RVE开头（告诉打印机发送RFID编码成功或失败的结果）。

如何在代码上下文中接收编码结果并检查编码过程是否成功？

    private void Print()
    {
        // Command to be sent to the printer
        string command = "~RVE^XA^RFw,H^FD033B2E3C9FD0803CE8000001^FS ^XZ";

        // Create a buffer with the command
        Byte[] buffer = new byte[command.Length];
        buffer = System.Text.Encoding.ASCII.GetBytes(command);
        // Use the CreateFile external func to connect to the LPT1 port
        SafeFileHandle printer = CreateFile("LPT1:", FileAccess.ReadWrite,
        0, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero);
        // Aqui verifico se a impressora é válida
        if (printer.IsInvalid == true)
        {
            return;
        }

        // Open the filestream to the lpt1 port and send the command
        FileStream lpt1 = new FileStream(printer, FileAccess.ReadWrite);

        Byte[] ResultBuffer = new byte[255];
        lpt1.Write(buffer, 0, buffer.Length);

        // Close the FileStream connection
        lpt1.Close();

    }

Answer 1

可能您无法使用LPT和CreateFile检索结果。您需要使用bi-directional communication, using sockets.

更新：有一个inpout32库，允许双向lpt端口通信。

Reading from Parallel Port using Inpout32.dll

Converting Visual Basic parallel port app using inpout32.dll in to Delphi

Download inpout32 binaries and sources

通过Zebra打印机RZ400验证编码标签

1 个答案: