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How to keep a multiline + vertical scrollbar textbox on the LAST line?

P: n/a
Hi all,

I'm using a multiline+scrollbar textbox to log output as my program
runs. Basically, I pass a reference to the class instance that's
currently doing stuff, and the instance can tack on whatever it needs
to the text property.

Initially I had trouble with getting the textbox to refresh
as-the-program ran, but the TextBox.Refresh() method took care of that
for me.

Now the problem is that the output lines run longer than the visible
textbox - so the most recent messages can't be seen until the routine
is completely finished.

I would like the textbox to "auto-scroll-to-the-bottom-line" every time
I tack a new line into it. How can I do this?

Thanks for any ideas,


Jan 25 '07 #1
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2 Replies

P: n/a
I had to do this once a long time back. After searching and searching the
only solution I could find was to do what is posted below. Also, I ended up
using a RichTextBox as it's buffer would hold more data.

I don't claim to know if this is the best way, but it was the only way I
could find via google and asking around a couple years ago, and it ended up
I had to p/invoke 2 win32 functions and create a point class:

[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

class POINT
public int x;
public int y;
public POINT()
public POINT(int x, int y)
this.x = x;
this.y = y;

Then, using my RichTextBox as below in a function where I passed in a

RichTextBox1.SelectionStart = RichTextBox1.TextLength + 1;
GetScrollRange(RichTextBox1.Handle, SB_VERT, out min, out max);
SendMessage(RichTextBox1.Handle, EM_SETSCROLLPOS, 0, new POINT(0, max -
Hope that helps.
Jan 26 '07 #2

P: n/a

On Jan 25, 4:16 pm, "Pete" <m...@ineedhelp.orgwrote:
I had to p/invoke 2 win32 functions and create a point class:
Thanks for the suggestion. After digging around, I found that using
TextBox.AppendText(string text), rather than TextBox.Text += text gives
the auto-scroll-to-bottom I needed - and much easier than going down to
the WinAPI.

Jan 26 '07 #3

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