private void Form1_Load(object sender, System.EventArgs e)

  {

   //获取或设置一个值，该值指示是否发送到文件或端口

   printDocument1.PrinterSettings.PrintToFile = true;

   //设置打印时横向还是纵向

   printDocument1.DefaultPageSettings.Landscape = true;

  }

  private void fileOpenMenuItem_Click(object sender, System.EventArgs e)

  {

   OpenFile();

  }

  private void OpenFile()

  {

   openFileDialog1.Filter = "Text Files (*.txt)|*.txt";//打开文本的类型

   //获取文件对话框的初始目录（StartupPath）获得bin文件下的文件

   openFileDialog1.InitialDirectory = System.Windows.Forms.Application.StartupPath;

   DialogResult userResponse = openFileDialog1.ShowDialog();

   //MessageBox.Show(userResponse.ToString());

   if (userResponse==DialogResult.OK)

   {

    filePath = openFileDialog1.FileName.ToString();//转换文件路径

   }

  }

  private void MyPrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)

   //充分利用e

  {

   

   int topMargin = printDocument1.DefaultPageSettings.Margins.Top;//上边距

   int leftMargin = printDocument1.DefaultPageSettings.Margins.Left;//左边距

   float linesPerPage = 0;//页面行号

   float verticalPosition = 0;//绘制字符串的纵向位置

   float horizontalPosition=leftMargin;//左边距

   string textLine = null;//行字符串

   currentLine = 0;//行计数器

//   float Xline=0;

   //int line=0;

   // Calculate the number of lines per page.

   linesPerPage = e.MarginBounds.Height / myFont.GetHeight(e.Graphics);

//   Xline=e.MarginBounds.Width/myFont.GetHeight();

   

            // for each text line that will fit on the page, read a new line from the document

   while (currentLine < linesPerPage )

   {

    textLine = streamToPrint.ReadLine();

    if(textLine == null)

    {

     break;

    }

    // 求出已经打印的范围

    

    verticalPosition = topMargin + currentLine * myFont.GetHeight(e.Graphics);

    // 设置页面的属性

    e.Graphics.DrawString(textLine, myFont, myBrush, horizontalPosition, verticalPosition);

    // 增加行数

    currentLine ++;

    

   }

   // If more lines of text exist in the file, print another page.

   if (textLine != null)

   {

    e.HasMorePages = true;

   }

   else

   {

    e.HasMorePages = false;

   }

  }

  private void printPreviewButton_Click(object sender, System.EventArgs e)

  {

   try

   {

    streamToPrint = new StreamReader(filePath);

    try

    {

     PrintPreview();

    }