狂急的问题!求远程打印如何设置字体大小!

代码如下:
public struct DOCINFO
        {
            [MarshalAs(UnmanagedType.LPWStr)]
            public string pDocName;
            [MarshalAs(UnmanagedType.LPWStr)]
            public string pOutputFile;
            [MarshalAs(UnmanagedType.LPWStr)]
            public string pDataType;
        }        public class PrintDirect
        {
            [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = false,
           CallingConvention = CallingConvention.StdCall)]
            public static extern long OpenPrinter(string pPrinterName, ref IntPtr phPrinter,
            int pDefault);            [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = false,
           CallingConvention = CallingConvention.StdCall)]
            public static extern long StartDocPrinter(IntPtr hPrinter, int Level,
            ref DOCINFO pDocInfo);            [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true,
           CallingConvention = CallingConvention.StdCall)]
            public static extern long StartPagePrinter(IntPtr hPrinter);            [DllImport("winspool.drv", CharSet = CharSet.Ansi, ExactSpelling = true,
           CallingConvention = CallingConvention.StdCall)]
            public static extern long WritePrinter(IntPtr hPrinter, string data,
            int buf, ref int pcWritten);            //[DllImport("winspool.Drv", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode,
            //SetLastError = true, ExactSpelling = true)]
            //public static extern bool WritePrinter(IntPtr hPrinter, byte pBytes, int dwCount, ref int dwWritten);            [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true,
           CallingConvention = CallingConvention.StdCall)]
            public static extern long EndPagePrinter(IntPtr hPrinter);            [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true,
           CallingConvention = CallingConvention.StdCall)]
            public static extern long EndDocPrinter(IntPtr hPrinter);            [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = true,
           CallingConvention = CallingConvention.StdCall)]
            public static extern long ClosePrinter(IntPtr hPrinter);
        }调用 ：string mhPrintData = string.Empty;
                mhPrintData = "打印内容";                
                System.IntPtr lhPrinter = new System.IntPtr();                DOCINFO di = new DOCINFO();
                int pcWritten = 0;
                
                PrintDirect.OpenPrinter("\\\\" + 远程打印机IP+ "\\" + 远程打印机名, ref lhPrinter, 0);
                PrintDirect.StartDocPrinter(lhPrinter, 1, ref di);
                PrintDirect.StartPagePrinter(lhPrinter);
              
                PrintDirect.WritePrinter(lhPrinter, mhPrintData.ToString(), mhPrintData.ToString().Length, ref pcWritten);
              
                PrintDirect.EndPagePrinter(lhPrinter);
                PrintDirect.EndDocPrinter(lhPrinter);
                PrintDirect.ClosePrinter(lhPrinter);求解：如何设置"打印内容"的字体大小!!!项目到期，情况紧急，求各位赐教!!!多谢了!!!!