直接输出字符串到远程打印机，出问题，贴代码，100分急求解！在线等
代码可以直接输出到远程打印机，但是A4纸上的却是乱码，代码如下，急求解，请高手指教！谢谢

public partial class Form1 : Form
{
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 ", 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);
}

//点击按钮，直接输出字符串到远程打印机
private void button2_Click(object sender, EventArgs e)
{
if (printStr == " " || printStr == null)
{
MessageBox.Show( "对不起，现在没有要打印的数据! ");
}
else
{
System.IntPtr lhPrinter = new System.IntPtr();

DOCINFO di = new DOCINFO();
int pcWritten = 0;

PrintDirect.OpenPrinter( "\\\\192.168.112.5\\1150PCL 5e ", ref lhPrinter, 0);
PrintDirect.StartDocPrinter(lhPrinter, 1, ref di);
PrintDirect.StartPagePrinter(lhPrinter);

myReader = new StringReader(this.richTextBox1.Text);

try
{
PrintDirect.WritePrinter(lhPrinter, ds.Tables[ "print "].Rows[0][ "data "].ToString(), printStr.Length, ref pcWritten);
}
catch (Exception ee)
{
Console.WriteLine(ee.Message);
}

PrintDirect.EndPagePrinter(lhPrinter);
PrintDirect.EndDocPrinter(lhPrinter);
PrintDirect.ClosePrinter(lhPrinter);
}
}
}

PS:
打印代码为：
PrintDirect.WritePrinter(lhPrinter, ds.Tables[ "print "].Rows[0][ "data "].ToString(), printStr.Length, ref pcWritten);

ds.Tables[ "print "].Rows[0][ "data "].ToString()//这是一段带格式的字符串



[解决办法]
乱码？会不会是编码没有统一啊
[解决办法]
ms-help://MS.MSDNQTR.2003FEB.2052/gdi/prntspol_93g2.htm
[解决办法]
ms-help://MS.MSDNQTR.v80.chs/MS.MSDN.v80/MS.WIN32COM.v10.en/gdi/prntspol_93g2.htm
[解决办法]
编码问题吧？CharSet 里改一下看看
1、试下byte[] 编码格式，
这个api用的是本机编码的吧，在形成byte[]时用Encoding的unicode编码，或者UTF8编码试下，在System.Text里,
不过得将声明改一下
[DllImport( "winspool.Drv ", CallingConvention=CallingConvention.StdCall, CharSet=CharSet.??, SetLastError=true, ExactSpelling=true)]
public static extern bool WritePrinter(IntPtr hPrinter, byte[] pBytes, int dwCount, ref int dwWritten);

2、可能是驱动问题，驱动程序不正确就打印不了中文！因为很多激光和喷墨打印机都没有汉字库，所以无法直接打印中文，在Windows下只有借助驱动程序，打印机才可以打印中文！
[解决办法]
请试下解决方法1
[解决办法]
try
LPBYTE lpData ===> System.IntPtr;
string str = ...
System.IntPtr lpdata = System.Text.Encoding.Default.GetBytes( str );