关于c#向打印机发送

[foutcast]

c#直接向打印机发送指令，网上查了下，说就是createfile，然后write就可以了，但是我发送的指令他都会打出来，而不是执行。如何发送一个16进制的指令1B4BFF，请帖主要代码，谢谢。下面是我自己的代码：

iHandle = CreateFile("lpt1", 0x40000000, 0, 0, 3, 0, 0);
            if (!iHandle.ToInt32().Equals(1))
            {
                int i;
                OVERLAPPED x;
                string str = "1B4BFF";
                int len = str.Length / 2;
                byte[] ab = new byte[len];
                for (int ii = 0; ii < len; ii++)
                {
                    string tmp = str.Substring(ii * 2, 2);
                    ab[ii] = Convert.ToByte(tmp, 16);
                }
                WriteFile(iHandle.ToInt32(), ab, ab.Length, out i, out x);

            }

[indeep]

这个我也不懂啊 希望有人解答

[foutcast]

另外：连接lpt1或者com1发送指令的写法是不是一样的

[CraxyMouse]

		#region //Some Value Of Print
		private const uint GENERIC_WRITE = 0x40000000;
		private const int OPEN_EXISTING = 3; 
		private const int INVALID_HANDLE_VALUE = -1;
		#endregion

		#region //API Createfile
		[DllImport("kernel32.dll")]
		private static extern int CreateFile(
			string lpFileName, 
			uint dwDesiredAccess, 
			int dwShareMode, 
			int lpSecurityAttributes, 
			int dwCreationDisposition,
			int dwFlagsAndAttributes, 
			int hTemplateFile 
			);
		#endregion

		#region //API CloseHandle
		[DllImport("kernel32.dll")]
		private static extern bool CloseHandle( int hObject);
		#endregion

		#region //CreateLPTFile
		private void CreateLPTFile(string str)
		{
			try
			{
				string LPT = "LPT1";
				int hPort = CreateFile(LPT,GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0);
				System.IntPtr hPortP = new IntPtr(hPort);
				FileStream fs;
				fs = new FileStream(hPortP, FileAccess.Write, false);           
				StreamWriter writer = new StreamWriter(fs);
				writer.AutoFlush = false;
				writer.WriteLine(str);
				writer.Flush();
				writer.Close();
				fs.Close();
				CloseHandle(hPort);
			}
			catch(IOException)
			{
				throw new MyCustomException("I/O Error, Please Check Printer Connection!");
			}			
		}
		#endregion