This is a test app I just wrote in VS.Net 2003 and it works fine for me..
it has one RichTextBox called richTextBox1 and a time that fires an
AppenText() method to the RichTextBox. here is the code of my form.
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
namespace Temp1
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.RichTextBox richTextBox1;
private System.Windows.Forms.Timer timer1;
private System.ComponentModel.IContainer components;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.richTextBox1 = new System.Windows.Forms.RichTextBox();
this.timer1 = new System.Windows.Forms.Timer(this.components);
this.SuspendLayout();
//
// richTextBox1
//
this.richTextBox1.Location = new System.Drawing.Point(8, 8);
this.richTextBox1.Name = "richTextBox1";
this.richTextBox1.Size = new System.Drawing.Size(248, 168);
this.richTextBox1.TabIndex = 0;
this.richTextBox1.Text = "richTextBox1";
this.richTextBox1.TextChanged += new
System.EventHandler(this.richTextBox1_TextChanged);
//
// timer1
//
this.timer1.Enabled = true;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(264, 190);
this.Controls.Add(this.richTextBox1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void timer1_Tick(object sender, System.EventArgs e) {
richTextBox1.AppendText("Added Line of Text");
}
#region external declarations for making output box always show last line.
const int SB_VERT = 1;
const int EM_SETSCROLLPOS = 0x0400 + 222;
[DllImport("user32", CharSet=CharSet.Auto)]
static extern bool GetScrollRange(IntPtr hWnd, int nBar, out int lpMinPos,
out int lpMaxPos);
[DllImport("user32", CharSet=CharSet.Auto)]
static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, POINT
lParam);
[StructLayout(LayoutKind.Sequential)]
class POINT {
public int x;
public int y;
public POINT() { }
public POINT(int x, int y) {
this.x = x;
this.y = y;
}
}
#endregion
private void richTextBox1_TextChanged(object sender, System.EventArgs e) {
int min, max;
GetScrollRange(richTextBox1.Handle, SB_VERT, out min, out max);
SendMessage(richTextBox1.Handle, EM_SETSCROLLPOS, 0, new POINT(0, max -
richTextBox1.Height));
}
}
}
