using System;

using System.Windows.Forms;

using System.Drawing;

using System.Runtime.InteropServices;

using System.Drawing.Printing;

#region 调用示例

/*使用

//页面设置

private void btnPageSetup_Click(object sender, EventArgs e)

{

    richTextBoxPrintClass r = new richTextBoxPrintClass();

    r.richTextBox = richTextBox1;

    r.ShowPageSetupDlg();

}

//打印预览功能

private void btnPrintPreview_Click(object sender, EventArgs e)

{

    richTextBoxPrintClass r = new richTextBoxPrintClass();

    r.richTextBox = richTextBox1;

    r.ShowShowPagePriviewDlg();

}

//打印

private void btnPrint_Click(object sender, EventArgs e)

{

    richTextBoxPrintClass r = new richTextBoxPrintClass();

    r.richTextBox = richTextBox1;

    r.ShowPrintDlg();

}

*/

#endregion

//http://support.microsoft.com/kb/812425/zh-cn

namespace WindowsFormsApplication1

{

    class richTextBoxPrintClass

    {

        public richTextBoxPrintClass()

        {

            InitializeComponent();

        }

        #region 打印功用

        //and the unit used by Win32 API calls (twips 1/1440 inch)

        private const double anInch = 14.4;

        [StructLayout(LayoutKind.Sequential)]

        private struct RECT

        {

            public int Left;

            public int Top;

            public int Right;

            public int Bottom;

        }

        [StructLayout(LayoutKind.Sequential)]

        private struct CHARRANGE

        {

            public int cpMin;         //First character of range (0 for start of doc)

            public int cpMax;           //Last character of range (-1 for end of doc)

        }

        [StructLayout(LayoutKind.Sequential)]

        private struct FORMATRANGE

        {

            public IntPtr hdc;             //Actual DC to draw on

            public IntPtr hdcTarget;       //Target DC for determining text formatting

            public RECT rc;                //Region of the DC to draw to (in twips)

            public RECT rcPage;            //Region of the whole DC (page size) (in twips)

            public CHARRANGE chrg;         //Range of text to draw (see earlier declaration)

        }

        private const int WM_USER = 0x0400;

        private const int EM_FORMATRANGE = WM_USER + ;

        [DllImport("USER32.dll")]

        private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);

        // Render the contents of the RichTextBox for printing

        //    Return the last character printed + 1 (printing start from this point for next page)

        public static int Print(RichTextBox richTextBox, int charFrom, int charTo, PrintPageEventArgs e)

        {

            //Calculate the area to render and print

            RECT rectToPrint;

            rectToPrint.Top = (int)(e.MarginBounds.Top * anInch);

            rectToPrint.Bottom = (int)(e.MarginBounds.Bottom * anInch);

            rectToPrint.Left = (int)(e.MarginBounds.Left * anInch);

            rectToPrint.Right = (int)(e.MarginBounds.Right * anInch);

            //Calculate the size of the page

            RECT rectPage;

            rectPage.Top = (int)(e.PageBounds.Top * anInch);

            rectPage.Bottom = (int)(e.PageBounds.Bottom * anInch);

            rectPage.Left = (int)(e.PageBounds.Left * anInch);

            rectPage.Right = (int)(e.PageBounds.Right * anInch);

            IntPtr hdc = e.Graphics.GetHdc();

            FORMATRANGE fmtRange;

            fmtRange.chrg.cpMax = charTo;                //Indicate character from to character to

            fmtRange.chrg.cpMin = charFrom;

            fmtRange.hdc = hdc;                    //Use the same DC for measuring and rendering

            fmtRange.hdcTarget = hdc;              //Point at printer hDC

            fmtRange.rc = rectToPrint;             //Indicate the area on page to print

            fmtRange.rcPage = rectPage;            //Indicate size of page

            IntPtr res = IntPtr.Zero;

            IntPtr wparam = IntPtr.Zero;

            wparam = new IntPtr();

            //Get the pointer to the FORMATRANGE structure in memory

            IntPtr lparam = IntPtr.Zero;

            lparam = Marshal.AllocCoTaskMem(Marshal.SizeOf(fmtRange));

            Marshal.StructureToPtr(fmtRange, lparam, false);

            //Send the rendered data for printing

            res = SendMessage(richTextBox.Handle, EM_FORMATRANGE, wparam, lparam);

            //Free the block of memory allocated

            Marshal.FreeCoTaskMem(lparam);

            //Release the device context handle obtained by a previous call

            e.Graphics.ReleaseHdc(hdc);

            //Return last + 1 character printer

            return res.ToInt32();

        }

        #endregion

        #region 初始化

        public RichTextBox richTextBox;

        private PageSetupDialog pageSetupDialog1;

        private PrintDialog printDialog1;

        private PrintDocument printDocument1;

        private PrintPreviewDialog printPreviewDialog1;

        private void InitializeComponent()

        {

            richTextBox = new RichTextBox();

            pageSetupDialog1 = new PageSetupDialog();

            printDialog1 = new PrintDialog();

            printDocument1 = new PrintDocument();

            printPreviewDialog1 = new PrintPreviewDialog();

            //

            // pageSetupDialog1

            //

            pageSetupDialog1.Document = printDocument1;

            //

            // printDialog1

            //

            printDialog1.Document = printDocument1;

            printDialog1.UseEXDialog = true;

            //

            // printDocument1

            //

            printDocument1.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(printDocument1_PrintPage);

            printDocument1.BeginPrint += new System.Drawing.Printing.PrintEventHandler(printDocument1_BeginPrint);

            //

            // printPreviewDialog1

            // 

            printPreviewDialog1.AutoScrollMargin = new System.Drawing.Size(, );

            printPreviewDialog1.AutoScrollMinSize = new System.Drawing.Size(, );

            printPreviewDialog1.ClientSize = new System.Drawing.Size(, );

            printPreviewDialog1.Document = printDocument1;

            printPreviewDialog1.Enabled = true;

            // printPreviewDialog1.Icon = ((System.Drawing.Icon)(resources.GetObject("printPreviewDialog1.Icon")));

            printPreviewDialog1.Name = "printPreviewDialog1";

            printPreviewDialog1.Visible = false;

        }

        private int checkPrint;

        private void printDocument1_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)

        {

            checkPrint = ;

        }

        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)

        {

            // Print the content of RichTextBox. Store the last character printed.

            //checkPrint = richTextBoxPrintCtrl1.Print(checkPrint, richTextBoxPrintCtrl1.TextLength, e);

            checkPrint = richTextBoxPrintClass.Print(richTextBox, checkPrint, richTextBox.TextLength, e);

            // Check for more pages

            if (checkPrint < richTextBox.TextLength)

                e.HasMorePages = true;

            else

                e.HasMorePages = false;

        }

        #endregion

        //页面设置功能

        public void ShowPageSetupDlg()

        {

            pageSetupDialog1.ShowDialog();

        }

        //打印预览功能

        public void ShowShowPagePriviewDlg()

        {

            printPreviewDialog1.ShowDialog();

        }

        //打印

        public void ShowPrintDlg()

        {

            if (printDialog1.ShowDialog() == DialogResult.OK)

                printDocument1.Print();

        }

    }

}