打印机清空色带和清空纸张操作

Question

请问思路应该怎么走？打印机是并口吧，我只做过串口读取数据的程序。
如何向打印机发送指令呢？

Answer 1

使用LPT1口就好了,
        [DllImport("kernel32")]
        static extern SafeFileHandle CreateFile(
        string filename,
        uint desiredAccess,
        uint shareMode,
        uint attributes,       //   really   SecurityAttributes   pointer   
        uint creationDisposition,
        uint flagsAndAttributes,
        uint templateFile);
        private const uint GENERIC_READ = 0x80000000;
        private const uint GENERIC_WRITE = 0x40000000;
        private const int OPEN_EXISTING = 3;
        private const int INVALID_HANDLE_VALUE = -1; public static void PrintStringToPrinter(string as_str, string s_Port_)
        {
            string s_Port = s_Port_;
            switch (s_Port.ToUpper())
            {
                case "LPT1":
                    SafeFileHandle iHandle;
                    iHandle = CreateFile("LPT1", GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
                    if (iHandle.IsInvalid)
                    {
                        throw new Exception("Can't find the printer connecting to the port of LPT1");
                    }
                    else
                    {
                        FileStream fs = new FileStream(iHandle, FileAccess.ReadWrite);
                        //fs.WriteTimeout=0; 
                        byte[] byteOut;
                        Int32 dwCount = as_str.Length;
                        byteOut = new byte[dwCount];
                        for (int i = 0; i < dwCount; i++)
                        {
                            byteOut[i] = System.Convert.ToByte(as_str[i]);
                        }
                        fs.Write(byteOut, 0, dwCount);
                        fs.Flush();
                        fs.Close();
                    }
                    break;
                
            }        }