再提打印问题
本人想通过创建 RichTextBoxPrintCtrl 控件中所输入的值来打印，现在只能打印一个RichTextBoxPrintCtrl 控件中所输入的值，如果我想打印5个chTextBoxPrintCtrl 中值该如何实现
创建 RichTextBoxPrintCtrl 控件
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新建一个名为 RichTextBoxPrintCtrl 的类库项目,代码如下：
using System;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Drawing.Printing;
namespace RichTextBoxPrintCtrl
{
public class RichTextBoxPrintCtrl:RichTextBox
{
//Convert the unit used by the .NET framework (1/100 inch)
//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 + 57;
[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 int Print( 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(1);
//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(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();
}
}
}
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创建一个新的 Windows 应用程序项目；代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Printing;
using System.IO;
namespace print
{
public partial class Form1 : Form
{
private int checkPrint1;
private int checkPrint2;
private int checkPrint3;
private int checkPrint4;
private int checkPrint5;
public Form1()
{
InitializeComponent();
this.printDocument1.BeginPrint += new System.Drawing.Printing.PrintEventHandler(this.printDocument1_BeginPrint);
this.printDocument1.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.printDocument1_PrintPage);
this.btnPrint.Click += new System.EventHandler(this.btnPrint_Click);
this.btnPrintPreview.Click += new System.EventHandler(this.btnPrintPreview_Click);
this.btnPageSetup.Click += new System.EventHandler(this.btnPageSetup_Click);
}
private void btnPageSetup_Click(object sender, EventArgs e)
{
pageSetupDialog1.ShowDialog ();
}
private void btnPrintPreview_Click(object sender, EventArgs e)
{
printPreviewDialog1.ShowDialog();
}
private void btnPrint_Click(object sender, EventArgs e)
{
if (printDialog1.ShowDialog() == DialogResult.OK)
printDocument1.Print();
}
private void printDocument1_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
{
checkPrint1 = 0;
checkPrint2 = 0;
checkPrint3 = 0;
checkPrint4 = 0;
checkPrint5 = 0;
}
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
// Print the content of RichTextBox. Store the last character printed.
checkPrint1 = richTextBoxPrintCtrl1.Print(checkPrint1, richTextBoxPrintCtrl1.TextLength, e);
// Check for more pages
if (checkPrint1 < richTextBoxPrintCtrl1.TextLength )
e.HasMorePages = true;
else
e.HasMorePages = false;
}
}
}
[解决办法]
报表打印控件wsReport4.6
