Re: total beginner - C# Discussion Boards

Re: TreeView Context menus

9-Dec-02 8:18

There are plenty projects on sourceforge[^] Smile | :)

DBHelper - SQL Stored Procedure Wrapper & Typed DataSet Generator for .NET

TreeView Context menus

Dave Kerr8-Dec-02 5:36

Dave Kerr

8-Dec-02 5:36

Hi,
I've have a tree view control that displays a scene graph (a collection of polygons, materials etc). I would like each type of object to have it's own context menu, for example, if the user right clicks on a node, it should check the 'Tag' property of the node, and if it is of a certain type it should show a certain context menu. Do I have to create a class derived from TreeView for this, or can I do it another way?

Dave Kerr
focus_business@hotmail.com
www.focus.esmartweb.com

leppie8-Dec-02 9:58

resource bitmap to imagelist

8-Dec-02 9:58

Just create a method that will create a menu based on the object in the Tag and call it from the OnClick event of the treeview, no need to inherit (yet Smile | :)

DBHelper - SQL Stored Procedure Wrapper & Typed DataSet Generator for .NET

total beginner

GaryR8-Dec-02 1:13

GaryR

8-Dec-02 1:13

Heck, I'm still trying to set up the djgpp thingy so I can do the "hello world " thing.
A lot of basic and a bit of pascal. None of which works in windows.

I need a plotter driver to run a home made plotter. It's a simple one run from the
printer port. Nothing fancy at all. A lot of other "hobby" folks would like to get it too.

I woulldn't mind trying to write it myself as a excuse to learn more about C.

Anybody interested in helping?

I made the interface boards and they work fine in dos mode with,yeck, basic.
Steppers are 400 steps per rotation 119 in.oz.

No, I don't realy expect anybody to come up for air on this.

Thanks anyway.

GaryR

Re: total beginner

joan_fl8-Dec-02 2:18

joan_fl

8-Dec-02 2:18

I would start simpl (Hello World), then work your way up to the Plotter Driver. When you have questions, this is a good place to post your problems. Smile | :)

Have fun!

Joan

Re: total beginner

GaryR8-Dec-02 4:15

GaryR

8-Dec-02 4:15

Thanks Joan for the fast reply. Simple is the key word for sure.

It toke for ever to find the most basic starting level info on working with the printer and con ports.
For others that read this looking for the same. A lot of surplus electroics places have a book,
Controling the World with Your PC by Paul Burgsman. It costs like $35 and is well worth it. It has a disc
with excutables as well as hard copy in basic,pascal, and c. This is in dos mode not windows.
I want to take it into windows. No, I don't have VB, only wish I did.
Between the book and this forum, I don't expect many problems. The chore will be getting it into a GUI
so somebody other than myself can easly use it. I'm thinking cheap shareware or freeware.
At the moment the most popular method is to use the hp7475a driver and plott to file, them use a dos
program to print the plt file on the homemade plotter through the paralle (printer) port.
The mechanics and electronics were easy, that I have a degree in. Smile | :)

Programing for windows
will be........interesting.

GaryR

peterchen8-Dec-02 0:10

peterchen

8-Dec-02 0:10

How to create an image list from a resoruce biutmap.
It's along the lines Bitmap.FromResource, and Imagelist.Images.AddStrip, but I'm lacking some syntax here.

Also, I can add a "resource template" to the project, but the "Resource View" tab remains empty. What's that?

If I could find a souvenir / just to prove the world was here [sighist]

Re: resource bitmap to imagelist

Jon Rista8-Dec-02 13:51

Jon Rista

8-Dec-02 13:51

Here is one way to do it. First, make sure your image resource is marked as "Embedded Resource".

Assembly thisAssembly = Assembly.GetAssembly(Type.GetType("Sample.Namespace.SomeForm"));
Stream bmpStream = thisAssembly.GetManifestResourceStream(Sample.Namespace.ResourceName");
Bitmap bmp = new Bitmap(bmpStream);
ImageList.Images.AddString(bmp);

Collections and the Collection Editor

Dave Kerr7-Dec-02 23:57

Dave Kerr

7-Dec-02 23:57

Hi,
I've been having loads of problems with collections in C#. Up to now, my main class in my program has stored large amounts of data (vertices, polygons etc) in ArrayList's. I'd like to be able to use the Collection Editor from the properties window though, and to do that I realise I need a specific collection for each object. However, I've tried deriving from CollectionBase, and half the function's I've used with ArrayList don't work, then I tried deriving from ArrayList and the program crashed.
I'd really like to just derive from ArrayList and make the collection type specific, can I do this? Or do I have to derive from CollectionBase, and if so, what code must I implement to make it work like ArrayList? I know where to go from there, using custom collection editors, but first I need my custom collection!
Any Ideas?

Dave Kerr
focus_business@hotmail.com
www.focus.esmartweb.com

Re: Collections and the Collection Editor

leppie8-Dec-02 0:50

Re: Collections and the Collection Editor

8-Dec-02 0:50

Here's all you need (you can obvious add some more methods):

public class MyTypeCollection: System.Collections.CollectionBase
{
   public MyTypeCollection(){}

   public virtual void Add(MyType value)
   {
      this.List.Add(value);
   }

   public virtual MyType this[int index]
   {
      get {return (MyType) this.List[index];}
      set {this.List[index] = value;}
   }

   public virtual void Remove(MyType value)
   {
      this.List.Remove(value);
   }
}

Nice typed collection with Collection Editor support. Smile | :)

DBHelper - SQL Stored Procedure Wrapper & Typed DataSet Generator for .NET

Dave Kerr8-Dec-02 2:12

Dave Kerr

8-Dec-02 2:12

Cheers that worked great! I didn't have to change any of the code at all, just replaced 'ArrayList' with 'VertexCollection' and it worked fine.
Thanks very much!

Dave Kerr
focus_business@hotmail.com
www.focus.esmartweb.com

Read Only Database in C#

europria7-Dec-02 21:16

europria

7-Dec-02 21:16

I am planning a ROM database in C# as hobby project. It may be usefull in retrieving big amounts of non transactional data from CD-ROM or disk file. I know Ms Access is an alternative but as I said it is a hobby project, more Access is not safe enough and brings a lot of overhead.

I may start with saving data into dataset objects, so that when I retrieve it , I can bind it into my win controls right away, anyway I would be retrieving them from database in datasets anyway.

I could save my data into dataset objects and serialize them but they become too big , and retrieving just one line of code would require loading a big file into memory.

Or I can split data and save chunks into numerous dataset objects and putting all these objects in a random access file, than building a hash table / index and saving it into the database. I assume this would minimize schema troubles and shift responsibility to ADO.NET in managing schema in Dataset.

I want your advise on this subject, may be totally different suggestions.

How to move a Splitter control?

Bog7-Dec-02 18:34

Bog

7-Dec-02 18:34

Is there a way to programmatically move a splitter control? I tried setting it's location, didn't work. I tried setting the size of one of the panels but that didn't work either.

"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx

Donald Blachly8-Dec-02 6:24

8-Dec-02 6:24

Say you want the panels divided vertically with a splitter control in between.

Dock the panelLeft as Fill
Dock panelRight as Right
Dock the splitter as Right

Programmatically change the size of panelRight with panelRight.Width

This should work.

When you come to a fork in the road, take it! Y. Berra

Bog9-Dec-02 10:55

Bog

9-Dec-02 10:55

Thanks, but it doesn't work.

Form f=new Form();
Panel pf=new Panel();
pf.Dock=DockStyle.Fill;
f.Add(pf);

Splitter s=new Splitter();
s.Dock=DocStyle.Top;
f.Add(s);

Panel pt=new Panel();
pt.Dock=DockStyle.Top;
f.Add(pt);

I have a form with two panels and a splitter inbetween. I can click on the splitter and move it around ok. when I change the size of either or both of the panels, their size does change, but the splitter stays put. If any gap is created it just gets the background color of the Form.

"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx

leppie9-Dec-02 11:43

9-Dec-02 11:43

If I remmeber correctly you will need to add the "Fill" panel last...

Hope this helps Smile | :)

DBHelper - SQL Stored Procedure Wrapper & Typed DataSet Generator for .NET

Donald Blachly10-Dec-02 15:10

10-Dec-02 15:10

Bog wrote
Thanks, but it doesn't work.

Are you using the IDE? If not, edit~~I think) you need to add event handlers to repaint the screen when a panel is resized.~~ (

I used the IDE and it worked fine.

Using the toolbox, add two panels and a splitter. Make sure you add these components to the form and not to one of the other components

Name them pTop, pBottom and s

Set the properties (using the property window) of each as follows:

-----------Dock------BackColor
pTop-------Fill------White
s----------Bottom----Black
pBottom----Bottom----Yellow

When you come to a fork in the road, take it! Y. Berra

Donald Blachly10-Dec-02 15:25

10-Dec-02 15:25

Try this:

using System;
using System.Windows.Forms;

namespace TestSplitter4
{
///

/// Summary description for Splitter4.
///

public class Splitter4 :System.Windows.Forms.Form
{

public Splitter4()
{
Panel pTop = new Panel();
pTop.Dock = DockStyle.Fill;
pTop.BackColor = System.Drawing.Color.White;

Splitter s = new Splitter();
s.Dock = DockStyle.Bottom;

Panel pBottom = new Panel();
pBottom.Dock = DockStyle.Bottom;
pBottom.BackColor = System.Drawing.Color.Aqua;

this.Controls.AddRange(new System.Windows.Forms.Control[] {
pTop,
s,
pBottom
});

}
public static void Main()
{
System.Windows.Forms.Application.Run( new Splitter4 ());
}
}

}

When you come to a fork in the road, take it! Y. Berra

Bog11-Dec-02 13:23

Bog

11-Dec-02 13:23

thank you Donald for all your attemps so far,

This works fine- but what I want to do is programmatically move the splitter.

Like, say the user clicks a button- the splitter changes it's location down 5 pixels, as if the user had clicked it and dragged. I've tried doing this by changing the height of either of the panels that the splitter is splitting- but what happens is, the panel sizes do change, but the splitter stays put.

"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx

Donald Blachly11-Dec-02 18:46

11-Dec-02 18:46

in an event, change the size of the panel that is not DockStyle.Fill

private void button2_Click(object sender, System.EventArgs e)
{
panel2.Height += 5;
}

When you come to a fork in the road, take it! Y. Berra