Re: DLL Problem (How?) - C# Discussion Boards

10-Feb-06 14:06

using System;

namespace MyClassNameDLL
{
///

/// Summary description for Class1.
///

public class MyClassName
{
public MyClassName()
{
//
// TODO: Add constructor logic here
//
}

public Hi()
{
szPassed = "Hi.";
}
}
}

MyClassName works as far as debugging, but Hi doesn't it says:

Class, struc, or interface must have a return type

What does that mean?

-- modified at 20:06 Friday 10th February, 2006

Re: DLL Problem

Dave Kreskowiak10-Feb-06 14:28

10-Feb-06 14:28

Your public Hi() is what it's complaining about. You haven't specified what the return type is, even if it's not supposed to have one (void).

using System;
 
namespace MyClassNameDLL
{
    /// 
    /// Summary description for Class1.
    /// 
    public class MyClassName
    {
        public MyClassName()
        {
            //
            // TODO: Add constructor logic here
            //
        }
 
        public void Hi()
        {
            string szPassed = "Hi.";
        }
    }
}

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

Expert Coming10-Feb-06 14:33

10-Feb-06 14:33

Ok, so I have a reference to the DLL file. How do I do the using statement?

Right now it is:

using MyClassNameDLL;

What else do I need?

Dave Kreskowiak10-Feb-06 14:56

10-Feb-06 14:56

Add a Reference to the MyClassNameDLL PROJECT, not the .DLL file. Since you're still developing the .DLL, it'll make changes easier when you recompile the app that's using this DLL.

Right-click the References folder, pick Add Reference. Click the Projects tab, then highlight your .DLL project (I'm assuming both projects are in the same solution!), then click OK.

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

kourvoisier10-Feb-06 14:59

kourvoisier

10-Feb-06 14:59

If your using Visual Studio be sure to add a reference to it
By right clicking the name of your project and selecting add reference in the solution explorer.
Browse to your .dll and select it.

if you have:

using MYClassNameDLL;

at the very top of your code

You are now ready to use your .dll in your code.

Hope this helps

Expert Coming10-Feb-06 15:09

10-Feb-06 15:09

When I want to use a function within the DLL how do I use it?

Usually I do:

Hi();

Dave Kreskowiak10-Feb-06 16:50

10-Feb-06 16:50

It's looking like you REALLY need to pick up a book on C#. The questions you've asked in this thread are all beginning concepts in programming, let alone C#.

GENERALLY, since you've imported the namespace your class sits in (the using statement at the top of the code), you can just create an instance of your class and call its Hi method:

MyClassName myClass = new MyClassName();
myClass.Hi();

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

Expert Coming10-Feb-06 17:09

10-Feb-06 17:09

Two things:

1st:

Although I don't take offense to you saying I don't know how to code, I have to say you are wrong. I do my time in coding with ASP.NET applications in which my employer require the code sit in a single .cs file. They don't want seperate .dlls or any other file except for files such as pictures. I am creating this program on my own to help me with a game I play.

2nd:
I am having no problem getting to the functions on the DLL, I have done what you stated above, but usually when you use a DLL you don't end up having to do things like MyClass.MyFunctions.

Thanks for the help.

Dave Kreskowiak10-Feb-06 17:25

10-Feb-06 17:25

ExpertComing wrote:
I am having no problem getting to the functions on the DLL, I have done what you stated above, but usually when you use a DLL you don't end up having to do things like MyClass.MyFunctions.

You're thinking of the time when these were actually called "functions". In an OOP model, they're called "methods".

There are different access levels for methods. The example I showed you is one where an instance of the host class must be created before you can call the method on that instance. Static methods don't require and instace, but you stil have to specify the class that is hosting them. You can either directly specify the host class, like MyClassName.Hi();, or, if you change the using statement to using MYClassNameDLL.MyClassName;, you can shorten the method call to Hi();. While it's easier to type, it leaves the source of the method a bit vague and makes your code harder to read.

ExpertComing wrote:
Although I don't take offense to you saying I don't know how to code, I have to say you are wrong. I do my time in coding with ASP.NET applications

In what language? ASP.NET is just a web page generation technology. The concepts you're refering to are still very basic, Beginning C# - Week #1, concepts. I don't see how you could possible write an ASP.NET app in C# without knowing the things you're asking about already.

I'm not here to insult you or ridicule your abilities. I'm just give you some advice based on the skill level of your question. If you are just starting out in C#, then you're best, fastest, method of learning this stuff is going to be a book. You'll get these questions answered far faster in those pages that you could in any forum.

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

Expert Coming10-Feb-06 17:32

Re: 2 question about C#....

10-Feb-06 17:32

Well, I would always have all my code in one class, it becomes a slight mess, but it was easy. I have 3 books, I'll read them, thanks for the help, and the advice. I was used to Visual Basic 5, before .NET. You are right about the functions verse methods thing, thanks.

2 question about C#....

Yanshof10-Feb-06 12:37

Yanshof

10-Feb-06 12:37

Hi All.

I'm using visual studio 2005.

1.When i minimize my application i want that the icon will appear like troy icon (near to windows clock ) and not in the main task bar.
How i do it ??

2.I need to create 2 list in my application. In those list i need to add some string`s.
I don't know what control i need to use to do it . I want to do it in some way that in each list i will grid and each string will be write in grid line.

Thanks for help. Blush | :O

Expert Coming10-Feb-06 13:03

Re: 2 question about C#....

10-Feb-06 13:03

Answer to Question 1:
Search CodeProject for arcticles on tray or taskbar programs

Answer to Question 2:
Depending on what kind of data you are pulling you have two options:

Set amount of date(You know there are only or a max of 100 items):
Use an array

Undefined amount of data(1-Infinite):
Use a list

Hope that helps

Sean8910-Feb-06 13:16

Sean89

10-Feb-06 13:16

1. Showing an icon in the system tray instead of the taskbar is really quite simple:

To do this, create a new notify icon object.

  NotifyIcon icon;<br />
<br />
        ...<br />
<br />
        private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
            //initialize icon<br />
            icon = new NotifyIcon();<br />
            <br />
            // set the icon that will be seen in the system tray<br />
            icon.Icon = this.Icon;<br />
            <br />
            /// event handler for when user double clicks the icon<br />
            icon.DoubleClick += new                 System.EventHandler(this.notifyIcon1_DoubleClick);<br />
<br />
            //show the icon<br />
            icon.Visible = true;<br />
<br />
        }<br />
<br />
        private void button1_Click(object sender, EventArgs e)<br />
        {         <br />
            //hide the current form<br />
            this.Hide();   <br />
        }<br />
<br />
        private void notifyIcon1_DoubleClick(object sender, EventArgs e)<br />
        {<br />
            // show the form when the user double clicks the icon<br />
            this.Show();<br />
        }

To not show the form in the taskbar simply set the ShowInTaskbar property of the form to false, and your set!

2. I'm not sure that I fully understand what you mean but based on what you've said a listview control comes to mind.

Re: 2 question about C#....

perlmunger10-Feb-06 18:14

perlmunger

10-Feb-06 18:14

This is a fairly commonly asked question. I haven't done it in .NET 2.0, however, here's what I did using .NET 1.1. I'm assuming it probably hasn't changed much.

In your form class, override the WndProc method as follows:

// Hijack the windows message for minimizing the windowing so that
// you simply hide the window rather than close it. This gives the
// appearance of minimizing to the tray.
protected override void WndProc(ref System.Windows.Forms.Message m)
{
	if(m.Msg != 0x0010)
	{
		base.WndProc(ref m);
	}
	else
	{
		this.Hide();
	}
}

As someone else mentioned you will need to use a NotifyIcon. The trick with that, though(at least in .NET 1.1) is that you have to assign an icon to the NotifyIcon that you create in the form designer. Otherwise it won't show up in the tray when you run it.

-Matt

------------------------------------------

The 3 great virtues of a programmer:
Laziness, Impatience, and Hubris.
--Larry Wall

Drawing with c#

kourvoisier10-Feb-06 12:29

kourvoisier

10-Feb-06 12:29

I have a question

I dont know if anyone here is familiar with the zedgraph API but its pretty cool.
http://zedgraph.sourceforge.net/[^]

I am having issues here tho.

I want to create a live moving chart that updates in front of your eyes every single second.

Stock Market Chart -- candlestick, bar chart, etc.

When i start my program i draw the graph but i do not populate it with data yet.

I then made a button that when it is pressed it will get the data feed and start populating the
graph chart. Here is the problem!!!!

When the data comes in my app just freezes!!! (in the background it's just constantly reading in the data not drawing or updated the chart at all)

So then i said okay let me just use a small amount of data.

When i clicked the button with a small amount of data it did absolutely nothing.

But when i minimized my application down to the windows taskbar or toolbar
(or whatever its called)
and then maximized it (brought it back up and to focus) The chart was populated and everything looked great.

I guess my question is why did i have to minimize it and then maximize it to see the results of the drawing of bars on the graph.

And why cant i see my data update and draw right in front of my eyes!!!

Thanks in advance to anyone who can help me....

M@dHatter10-Feb-06 12:37

M@dHatter

10-Feb-06 12:37

How and when are you painting?, show your method.

Are you calling your paint method on each pass?

Are you double buffering your graphics?

Are you looping through your data first, then painting or are you painting on every loop of data?

TheJudeDude10-Feb-06 13:47

TheJudeDude

10-Feb-06 13:47

I believe you need to refresh your form/chart every time you want to update the chart. You said every second. I would try a timer and the tick event, refresh your form.
jude

kourvoisier10-Feb-06 14:54

kourvoisier

10-Feb-06 14:54

Refreshing the form was exactly what i needed to do.

Thanks alot.