scrollbars in RichTextBox

[user]

Hello
When i add new lines of text to my RichTextBox, and when vertical scroll
bar appear (there is more text than RichTextBox can display),
RichTextBox always display "the oldest text" (vertical scrollbar is
always rolled to the top).
And i want to see "fresh text" (vertical scrollbar should be rolled to
bottom position).
How can i do that ?
Thanx

[Martin Dew]

check out my thread from yesterday titled...

"going to last line of text in a RichTextBox" Mattin Dechev supplied me an answer that works perfectly.

<us**@domain.in valid> wrote in message news:eP******** ******@TK2MSFTN GP09.phx.gbl...

Hello
When i add new lines of text to my RichTextBox, and when vertical scroll
bar appear (there is more text than RichTextBox can display),
RichTextBox always display "the oldest text" (vertical scrollbar is
always rolled to the top).
And i want to see "fresh text" (vertical scrollbar should be rolled to
bottom position).
How can i do that ?


Thanx

[user]

it does not work for me. Program compiles, and run but when text should
be displayed program hangs and thru error:
Additional information: Can not marshal parameter #4: The type
definition of this type has no layout information.
Why ?

[Martin Dew]

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.Collecti ons;

using System.Componen tModel;

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.RichTextB ox richTextBox1;

private System.Windows. Forms.Timer timer1;

private System.Componen tModel.IContain er components;

public Form1()

{

//

// Required for Windows Form Designer support

//

InitializeCompo nent();

//

// TODO: Add any constructor code after InitializeCompo nent call

//

}

/// <summary>

/// Clean up any resources being used.

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Disp ose();

}

}

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 InitializeCompo nent()

{

this.components = new System.Componen tModel.Containe r();

this.richTextBo x1 = new System.Windows. Forms.RichTextB ox();

this.timer1 = new System.Windows. Forms.Timer(thi s.components);

this.SuspendLay out();

//

// richTextBox1

//

this.richTextBo x1.Location = new System.Drawing. Point(8, 8);

this.richTextBo x1.Name = "richTextBo x1";

this.richTextBo x1.Size = new System.Drawing. Size(248, 168);

this.richTextBo x1.TabIndex = 0;

this.richTextBo x1.Text = "richTextBo x1";

this.richTextBo x1.TextChanged += new
System.EventHan dler(this.richT extBox1_TextCha nged);

//

// timer1

//

this.timer1.Ena bled = true;

this.timer1.Tic k += new System.EventHan dler(this.timer 1_Tick);

//

// Form1

//

this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);

this.ClientSize = new System.Drawing. Size(264, 190);

this.Controls.A dd(this.richTex tBox1);

this.Name = "Form1";

this.Text = "Form1";

this.ResumeLayo ut(false);

}

#endregion

/// <summary>

/// The main entry point for the application.

/// </summary>

[STAThread]

static void Main()

{

Application.Run (new Form1());

}

private void timer1_Tick(obj ect sender, System.EventArg s e) {

richTextBox1.Ap pendText("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("user 32", CharSet=CharSet .Auto)]

static extern bool GetScrollRange( IntPtr hWnd, int nBar, out int lpMinPos,

out int lpMaxPos);

[DllImport("user 32", CharSet=CharSet .Auto)]

static extern IntPtr SendMessage(Int Ptr hWnd, int msg, int wParam, POINT

lParam);

[StructLayout(La youtKind.Sequen tial)]

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_Te xtChanged(objec t sender, System.EventArg s e) {

int min, max;

GetScrollRange( richTextBox1.Ha ndle, SB_VERT, out min, out max);

SendMessage(ric hTextBox1.Handl e, EM_SETSCROLLPOS , 0, new POINT(0, max -

richTextBox1.He ight));

}

}

}

[user]

Thanx a lot.
i did not inlude [StructLayout(La youtKind.Sequen tial)]....
Now it works fine :)

[user]

by the way:
There is TextChanged event in TextBox class, what is appriopriate event
in ListView class ?