C# Discussion Boards - CodeProject

12-Jun-04 23:07

How kan I make a button without borders that popups?
I kan make popup button but when the mouse isn't
over, the button still have border.

Behzad Ebrahimi13-Jun-04 1:31

Behzad Ebrahimi

13-Jun-04 1:31

Did you see http://www.codeproject.com/buttonctrl/cbuttonst.asp[^]

zlaty13-Jun-04 3:30

13-Jun-04 3:30

Thank you very much!
Is it not possible to be made directly in C#
without a class in C++?

Heath Stewart13-Jun-04 18:18

Heath Stewart

13-Jun-04 18:18

Yes, but the concepts are usually the same. Almost every Windows Forms control (including the Button) merely encapsulates the Windows Common Controls, so what's possible when handling messages is the way it's typically done in .NET (taking into account, of course, that much functionality is already exposed in methods, properties, and events - so don't redo what's already been done).

If you search CodeProject for buttons in the C# and .NET categories, you're bound to find a better example of this.

Also, read about the Button.FlatStyle property (inheritted from ButtonBase) in the .NET Framework SDK to see if that will do what you need.

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zlaty14-Jun-04 1:25

How to switch off autorun function

14-Jun-04 1:25

Thank you very much Smile | :)

))

zlaty12-Jun-04 22:40

12-Jun-04 22:40

I would like to switch off with code the autorun function
when I put a new CD in the CD drive. I have to read
information from my programme for the files on the CD
without interupting from the autorun function.
How can I do this?

Colin Angus Mackay13-Jun-04 1:02

Colin Angus Mackay

13-Jun-04 1:02

I don't understand. You want to write a program to switch off the autorun feature so you can insert a CD without it auto running? Why not just press the shift key while inserting the CD?

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zlaty13-Jun-04 3:19

13-Jun-04 3:19

This would be an option if it was only one cd; but the program that I'm building is for cataloging several cd's and it is not so practical to hold down the shift key for several seconds every time i want to add a cd. Keep in mind also that not all of my users will be aware of this option so i prefere to "temporary" disable the autorun function while using the program Smile | :)

Stefan Troschuetz13-Jun-04 4:03

Stefan Troschuetz

13-Jun-04 4:03

As the Microsoft Powertoy TweakUI allows you to disable the Autorun function of drives, I think this can be done by manipulating the registry.

Don't know a concrete key for this, but maybe you could get this info in some forum which deals with Windows and stuff like that Smile | :)

www.troschuetz.de

zlaty13-Jun-04 5:27

13-Jun-04 5:27

Thank you very much.
The problem is that if I do this with windows registry
I have to restart my computer and I would want to do
this without restarting the computer.
Have you other idea?

Stefan Troschuetz13-Jun-04 5:44

Stefan Troschuetz

13-Jun-04 5:44

Uuh, you're right. Didn't considered that.

Maybe you can somehow simulate the holding of the Shift-Key, which Colin proposed, programmatically. It isn't quite elegant, but maybe it works.

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zlaty13-Jun-04 9:59

13-Jun-04 9:59

Thank you

Heath Stewart13-Jun-04 18:15

Heath Stewart

13-Jun-04 18:15

There is a programmatic way, and many installers (including the Windows Installer runtime) will do this when prompting for CDs.

In order to do this, you must P/Invoke the RegisterWindowsMessage API to register a windows message that should be handled in your Forms override to the WndProc method. I would recommend defining a property to easily enable or disable autorun:

public class MyForm : Form
{
  // ...
  internal static uint QueryCancelAutoPlayMsg;
  private bool enableAutoPlay = true;
  public bool EnableAutoPlay
  {
    get { return enableAutoPlay ; }
    set { enableAutoPlay = value; }
  }
  [DllImport("user32.dll", CharSet=CharSet.Auto)]
  private static extern uint RegisterWindowMessage(string msg);
  protected override void WndProc(ref Message m)
  {
    base.WndProc(ref m);
    if (QueryCancelAutoPlayMsg == 0)
      QueryCancelAutoPlayMsg = RegisterWindows=Message("QueryCancelAutoPlay");
    if (m.Msg == QueryCancelAutoPlayMsg)
      m.Result = new IntPtr((int)enableAutoPlay);
  }
}

Please note that this is only a sample. I recommend you read more about canceling autoplay on MSDN in Enabling and Disabling AutoPlay[^].

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zlaty14-Jun-04 4:26

C# Noob in trouble with enumerations

14-Jun-04 4:26

Thank you very much!!!! Smile | :)

))
You are super! You have always
a answer for a difficult question!
Thank you very much once again! Smile | :)

))

Wingnut7412-Jun-04 20:02

Wingnut74

12-Jun-04 20:02

I am a moderately-skilled VB.NET guy who has (very) recently moved to C#. Where I seem to be having trouble is whenever I expect the same sort of forgiveness that VB seemed to give.

It seems that enums in C# are not as flexible as they were in VB. I am not sure if this true, but I am struggling where I did not expect to.

I have an enum that has int values. Basically, it is like this:

public enum Things<br />
{thing0 = 0, thing1 = 1, thing2 = 2}

... and so forth. What I can't do is this:

int numericThing = 1;<br />
Things aThing;<br />
aThing = numericThing; // should be thing1, right?

This throws a CS0029 error about how it cannot implicitly convert type int to type Things.

What am I missing? I mean, if it doesn't work this way? What's the point?
I do not want to curl into the fetal position and crawl back to VB...

David M. Kean12-Jun-04 20:22

David M. Kean

12-Jun-04 20:22

You need to cast it to Things:

Things aThing = (Things)numericThing;

Daniel Turini12-Jun-04 23:56

Daniel Turini

12-Jun-04 23:56

Wingnut74 wrote:
What am I missing? I mean, if it doesn't work this way? What's the point?
I do not want to curl into the fetal position and crawl back to VB...
As mentioned, you need to cast it to int.
And, IMO, this is one of the C# strenghts over VB. Notice, VB allows you to do things that may cause hard to find runtime bugs, while C# will stop them at the moment you're compiling. This is called a "strongly-typed language".
notice this code:

int numericThing = 1;
Things aThing;
aThing = (Things)numericThing;

Now, it compiles, but does it work? Not always. What if numericThing has a value that is an invalid Thing? You should validate it before assigning.
And that's why the C# compiler stopped you.

Yes, even I am blogging now!

Wingnut7413-Jun-04 5:07

Wingnut74

13-Jun-04 5:07

Daniel Turini wrote:
Now, it compiles, but does it work? Not always. What if numericThing has a value that is an invalid Thing? You should validate it before assigning.
And that's why the C# compiler stopped you.

Thanks to both of you. I figured it was something I was missing and was related to the way I have become used to VB's mommy-coddling.

I am still a bit out of my comfort zone, but I see the truth of what you are saying. I just have some re-learning ahead of me.

Thanks again.

Cotter13-Jun-04 5:34

Cotter

13-Jun-04 5:34

My question is why are you even trying to assign an integer to an enum?

Whatever it is be aware of the very useful Enum.Parse For instance, in the case of persisting to fule it might be better to use the enum's name incase the enum's underlyng value was ever changed.

Wingnut7413-Jun-04 5:37

Wingnut74

13-Jun-04 5:37

I need to create an object that takes its values from a database. The value of the enum is stored as an int, and I need to convert it back to the enum as I build the object.