Re: basic C# question - C# Discussion Boards

2-Oct-02 20:05

A panel class derives from System.Windows.Forms.ScrollableControl and, as such, exposes methods such like SetDisplayRectLocation(x,y) to move programmatically a scrollbar.
The panel WndProc also manages standard WM_HSCROLL(0x0114) and WM_VSCROLL(0x0115) messages sent because of interaction : you may in turn create such messages to move the current position.

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

basic C# question

Anonymous2-Oct-02 19:27

Anonymous

2-Oct-02 19:27

What is the equivalent to vector or CStringArray in C#?

Re: basic C# question

Stephane Rodriguez.2-Oct-02 19:51

Can anyone help with a Shell32 problem?

2-Oct-02 19:51

System.Collections.ArrayList

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

Re: basic C# question

James T. Johnson3-Oct-02 1:49

James T. Johnson

3-Oct-02 1:49

Even more to the point

System.Collection.Specialized.StringCollection Wink | ;)

James
Sig code stolen from David Wulff

Furty2-Oct-02 17:58

Furty

2-Oct-02 17:58

I've built a C# FolderTreeView control, and uploaded it here: http://www.codeproject.com/useritems/FolderTreeView.asp[^]

As stated in the known limitations, I cannot figure out how to get a Shell32.FolderItem of the Shell32.ShellSpecialFolderConstants.ssfDESKTOP constant. What this means is that although my control works great (well, does for me Smile | :)

it cannot start at the Desktop like Windows Explorer does Frown | :(

Can anyone help?

Stephane Rodriguez.2-Oct-02 21:28

2-Oct-02 21:28

In fact, comparing to Windows Explorer, what the tree control is missing is the actual Explorer namespaces.
Fortunately, they are easy to lookup. See this article[^].

In short, default namespaces (MyComputer, MyDocuments, Recyclebin, network neighbourhood, Internet Explorer, and Control panel) are all accessed through this registry scheme :

HKEY_LOCAL_MACHINE
Software
  Microsoft
   Windows
    CurrentVersion
     Explorer
      Virtual Folder Name
       Namespace
        {Extension CLSID}

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

Furty3-Oct-02 0:18

Furty

3-Oct-02 0:18

Thanks Stephane, but what I need is a Shell32.FolderItem object. Does anyone know how to create this from a string path?

Stephane Rodriguez.3-Oct-02 0:22

3-Oct-02 0:22

Furty wrote:
a string path

You must be kidding. You have the namespace CLSID to play with.

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

Furty3-Oct-02 0:54

Furty

3-Oct-02 0:54

StephaneRodriguez wrote:
You must be kidding

I'm afraid not Frown | :(

StephaneRodriguez wrote:
You have the namespace CLSID to play with.

Right now it may as well be a nuclear bomb to play with Smile | :)

I'm a begginner, and have zero experience with anything other than C# and .NET. So basically I have no idea what to do with the CLSID, all I know is that to achieve the result I want, I need a Shell32.FolderItem object that represents the virtual desktop folder. Please excuse my newbie-ness Frown | :(

Thanks for the help.

Stephane Rodriguez.3-Oct-02 0:59

3-Oct-02 0:59

It's not a matter of being a beginner. There are several articles about it in MSDN/MSJ. I would start doing it in C++ first (because the code snippets you'll find are in C++), then do it in C#.

If we rewind the discussion to the beginning, what is the aim of your article ? Carlos's article actually show folders, namespaces, whatever you see in Windows Explorer. The only bad fact about it is it comes with an external control which is limiting because you have to distribute it as well. And actually is ready to do more things (which in turn may be useless for a lot of people). But heck, what about submitting Carlos its revamped tree control, thin, reusable, and with no external control at all ?

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

VS.NET and ASP.NET

Nick Parker2-Oct-02 17:40

Nick Parker

2-Oct-02 17:40

Ok, I am working on writing a forum control and when I try to compile (command line) something very simple I get a slew of errors. This is what the code behind portion has right now, any thoughts? As soon as I comment out the constructor and the Page_Init event everything compiles ok, however when I move the dll file that is created over to the bin, the word "Hello" isn't printed to the screen.

using System;
using System.Collections;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;

namespace DeveloperNotesForum
{
	public class Forum:System.Web.UI.Page
	{
		
		public Forum
		{
			Page.Init += new System.EventHandler(Page_Init);	
		}
		
		private void Page_Load(object sender, EventArgs e)
		{
			Response.Write("Hello");	
		}		
		
		private void Page_Init(object sender, EventArgs e)
		{
			InitializeComponent();	
		}
		
		
		
	}
}

The errors look like this:

<br />
error CS1519: Invalid token "{" in class, struct, or interface member declaration.<br />

Nick Parker

The goal of Computer Science is to build something that will last at least until we've finished building it. - Unknown

David Stone2-Oct-02 17:57

David Stone

2-Oct-02 17:57

Your EventHandler is declared with the method name Page_Init and your method is Page_Int. Hope that helps. Smile | :)

Norm Almond: I seen some GUI's in my life but WTF is this mess
Leppie: I made an app for my sister and she wouldnt use it till it was colorful enough
Norm:good point leppie, from that statement I can only deduce that this GUI must be aimed at children
Leppie:My sister is 25
-Norm on the MailMagic GUI

Nick Parker2-Oct-02 18:08

Nick Parker

2-Oct-02 18:08

Thanks, I missed the i, however that didn't do it, I copied the errors I was getting from the command line compiler, any more thoughts:

<br />
<br />
C:\Inetpub\wwwroot>csc /target:library forum.aspx.cs<br />
Microsoft (R) Visual C# .NET Compiler version 7.00.9466<br />
for Microsoft (R) .NET Framework version 1.0.3705<br />
Copyright (C) Microsoft Corporation 2001. All rights reserved.<br />
<br />
forum.aspx.cs(16,3): error CS1519: Invalid token '{' in class, struct, or<br />
        interface member declaration<br />
forum.aspx.cs(17,14): error CS1519: Invalid token '+=' in class, struct, or<br />
        interface member declaration<br />
forum.aspx.cs(17,40): error CS1519: Invalid token '(' in class, struct, or<br />
        interface member declaration<br />
forum.aspx.cs(17,50): error CS1519: Invalid token ')' in class, struct, or<br />
        interface member declaration<br />
forum.aspx.cs(21,3): error CS0116: A namespace does not directly contain members<br />
        such as fields or methods<br />
forum.aspx.cs(34,1): error CS1022: Type or namespace definition, or end-of-file<br />
        expected<br />
<br />
C:\Inetpub\wwwroot><br />

Nick Parker

The goal of Computer Science is to build something that will last at least until we've finished building it. - Unknown

David Stone2-Oct-02 19:03

David Stone

2-Oct-02 19:03

Your constructor needs to be named public Forum()

Does that work? I put it into a cs file in VS.NET and it wasn't formatting correctly, that's when I noticed that you need the parens.

If you're going to be doing a lot of ASP.NET, then you may want to look into getting VS.NET. Or if you can't afford that, then you should look into getting WebMatrix from www.asp.net[^] It's free too. Smile | :)

Nick Parker3-Oct-02 1:12

Nick Parker

3-Oct-02 1:12

David Stone wrote:
Does that work?

Yep, that pretty much did it. Wink | ;)

David Stone wrote:
If you're going to be doing a lot of ASP.NET, then you may want to look into getting VS.NET. Or if you can't afford that, then you should look into getting WebMatrix from www.asp.net[^] It's free too.

Actually I have both Smile | :)

, however I am trying to learn all the nitty gritty parts to it by doing it by hand. The IDE holds your hand through a lot of it. Thanks David. Smile | :)

Nick Parker

The goal of Computer Science is to build something that will last at least until we've finished building it. - Unknown

leppie3-Oct-02 3:01

leppie

3-Oct-02 3:01

Nick Parker wrote:
Actually I have both , however I am trying to learn all the nitty gritty parts to it by doing it by hand.

So much for RAD Wink | ;)

Give them a chance! Do it for the kittens, dear God, the kittens!
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