C# Discussion Boards - CodeProject

14-Oct-05 18:30

Hi all,

I have a richtextbox and a vertical scrollbar on the form

now when i enter text into the richtextbox after it exceeds it's height

the scrollbar for the richtext is shown and we can scroll the contents of the

richtext,

Now i want to hide this scrollbar and want the contents to be scrolled

using the vertical scrollbar that i have put on the form.

Any code or hint will be helpful

Thanks and Regards,

Pramod

g00fyman15-Oct-05 0:02

g00fyman

15-Oct-05 0:02

set your scrollbars to 'none' and use the SendMessage API call to control the scrolling

e.g.,

<br />
using System.Runtime.InteropServices;<br />
<br />
private const int WM_SCROLL = 276; // Horizontal scroll<br />
private const int WM_VSCROLL = 277; // Vertical scroll<br />
private const int SB_LINEUP = 0; // Scrolls one line up<br />
private const int SB_LINELEFT = 0;// Scrolls one cell left<br />
private const int SB_LINEDOWN = 1; // Scrolls one line down<br />
private const int SB_LINERIGHT = 1;// Scrolls one cell right<br />
private const int SB_PAGEUP = 2; // Scrolls one page up<br />
private const int SB_PAGELEFT = 2;// Scrolls one page left<br />
private const int SB_PAGEDOWN = 3; // Scrolls one page down<br />
private const int SB_PAGERIGTH = 3; // Scrolls one page right<br />
private const int SB_PAGETOP = 6; // Scrolls to the upper left<br />
private const int SB_LEFT = 6; // Scrolls to the left<br />
private const int SB_PAGEBOTTOM = 7; // Scrolls to the upper right<br />
private const int SB_RIGHT = 7; // Scrolls to the right<br />
private const int SB_ENDSCROLL = 8; // Ends scroll<br />
<br />
[DllImport("user32.dll",CharSet=CharSet.Auto)]<br />
private static extern int SendMessage(IntPtr hWnd, int wMsg,IntPtr wParam, IntPtr lParam);<br />

then call SendMessage() and the way you want to scroll Smile | :)

hope that helps
g00fy

AB777115-Oct-05 2:55

AB7771

15-Oct-05 2:55

Thanks for ur reply

but i want to know when we use the default scroll bar of

the richtextbox then how to know whether the scroll is up or down

hope u get ny problem

Thanks and Regards,

Pramod

mav.northwind15-Oct-05 22:43

mav.northwind

15-Oct-05 22:43

Override the WndProc of your RichTextBox and catch the scrollin messages there.

Regards,
mav

getting folder size from windows

AB777116-Oct-05 19:08

AB7771

16-Oct-05 19:08

Hi mav,

i have done the same thing but i'm not

able to catch the scrolling event of richtextbox there

it capture's the scroll event of the vertical scroll bar

that i have placed on the form

can u give any idea to catch the scroll event of

the Richtextbox in the wndProc Method

Thanks

Pramod

g00fyman14-Oct-05 18:19

g00fyman

14-Oct-05 18:19

hi to all, Smile | :)

i am writing an app that lets users browse a folder. so they can perform several file/folder tasks on that folder and its subfolder/file.

i would like to be able to display teh folder stats when they open the top level folder.
at the moment, i am using directoryinfo and fileinfo and recursivley iterating the entire structure from the top level folder down, jsut to get the filesize.

is there a way to grab this from windows any quicker than this, cause if they select a drive ... well u know whats going to happen. i am also only building the tree structure that reflects the filesystem to a certain depth until they click to that depth i dont go any further.

if there is no other way to get folder size i might try creating the entire tree structure in the same recursive loop and see if the overhead is too much

any ideas pls??

regards,
g00fy

Re: getting folder size from windows

Guffa14-Oct-05 22:07

Re: getting folder size from windows

14-Oct-05 22:07

The total size of the contents of a folder is not stored anywhere. If you can get that information from the system, it will be doing exactly what you are doing yourself, recursively looping through every subfolder to sum up the file sizes.

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g00fyman14-Oct-05 22:14

g00fyman

14-Oct-05 22:14

thans for the reply,

i thought that after i posted, as i tried it on a folder and watched the count go up.

i just optimised my recursion and its working quite well now, it seems to beat the windows effort for the same folder on the same machine and i'm generating the tree for the structure as well. maybe windows is doing some indexing on the first size check as the next time you do it, it is faster.

thanx again,
g00fy

Re: getting folder size from windows

Guffa14-Oct-05 22:36

code about case-based reasoning

14-Oct-05 22:36

The reason it's faster on the second go, is that the most of the clusters containing the directory information is still in the disk cache. On the first go all the clusters has to be retrieved from the disk.

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Rachel.S Shen14-Oct-05 16:15

Rachel.S Shen

14-Oct-05 16:15

hi I'm a complete learner about c# programming,I need some source code with the algorithm of case-based resoning.

pls help me Smile | :)

thanks in advance

Re: code about case-based reasoning

...---...14-Oct-05 16:53

...---...

14-Oct-05 16:53

Hi,
You need what is called a "switch" statement for "case based reasoning".
I would give you some code but what you are asking is so fundamental to almost any programming language
that I would suggest that you consult the MSDN help or any C# text (only so you really understand what you are doing). In addition,"case based reasoning (as you call it) is found in C, C++ C# etc..
so if you are looking for an easy way out you are cheating yourself

hope this helps.....

Re: code about case-based reasoning

Guffa14-Oct-05 22:09

Button disabling while a page is still loading

14-Oct-05 22:09

MSDN: The switch statement[^]

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TheMajorRager14-Oct-05 14:07

TheMajorRager

14-Oct-05 14:07

Hello again everyone. I am working on this project, and when the user clicks submit, while the page is loading to another page, I want that button to be disabled. I tried just going

<br />
<br />
Submit_Button.Enabled=false;<br />

but that didnt work while the page was loading, it only worked after a post back. Is there a way to immediately make it disabled after the user clicks it before it posts back while the page is loading?

Re: Button disabling while a page is still loading

Guffa14-Oct-05 22:21

I can't get to the next TextBox-- Help

14-Oct-05 22:21

Use javascript to disable it. As you disable the button you might need to post the form using javascript also, as you can't post a form using a disabled button.

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Anonymous14-Oct-05 13:54

Re: I can't get to the next TextBox-- Help

14-Oct-05 13:54

I received lots of help last night trying to get text validated. Problem now is I can't "click out" of the 1st TextBox to the next one or close down the App. What to do?

private void textComplex_1Real_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
TextBox textBox1 = sender as TextBox;
if(textBox1 == null)
return;

if(textBox1.TextLength == 0)
return;

bool error = false;

try
{
cmplxValue1.Real = Convert.ToDouble(textComplex_1Real.Text);
//cmplxValue1.Imaginary = Convert.ToDouble(textComplex_1Imaginary.Text);
//this would be the next TextBox to validate
}

catch(Exception ex)
{
error = true;
}

finally
{
if(error)
MessageBox.Show("Error");
textBox1.SelectAll();
textBox1.Focus();

e.Cancel = true;
}
}

Anonymous14-Oct-05 18:16

Re: I can't get to the next TextBox-- Help

14-Oct-05 18:16

Hi,

I did not get what actually you are trying

to do.

Please could you specify what u want to achieve...

Regards,

Pramod

leppie14-Oct-05 19:17

leppie

14-Oct-05 19:17

Anonymous wrote:
e.Cancel = true;

^{xacc-ide 0.0.99-preview3}

Re: I can't get to the next TextBox-- Help

Guffa14-Oct-05 22:32

14-Oct-05 22:32

Instead of locking the user inside the textbox until it validates, do something else to show that the data in the textbox is wrong, like changing it's background color, and disable the ability to go further to use the text in the textbox (e.g. the next/send/submit/ok button).

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Anonymous14-Oct-05 12:06

14-Oct-05 12:06

i m working on my study project. i divided that in different modules, now i need to call one module from another module.

Dave Kreskowiak14-Oct-05 12:17

Dave Kreskowiak

14-Oct-05 12:17

You're going to have to supply ALOT more information than that. What do you want to call, specifically? Some code snippets might help too.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Anonymous15-Oct-05 11:30

15-Oct-05 11:30

simply the person wants to open an exe file from the C#.

mav.northwind15-Oct-05 22:41

mav.northwind

15-Oct-05 22:41

Use Process.Start().

mav