C++ define statements == what in C#? - C# Discussion Boards

Handle for a child window?

7-May-03 20:03

flyingv wrote:
I must add to my Exe file that program work properly on computer with Win98, ME, 2000, 95... withowt Microsoft .NET framework

Any .NET program requires the .NET run-time to work. The best you can do if you don't want to embed the 20MB+ dotnetfx.exe redistribuable in your setup is to put a link in your readme.txt or documentation.

lxhan7-May-03 17:26

lxhan

7-May-03 17:26

How do I get the handle for a child window from a MDI in C#.Net?

Getting the handle to the Mainframe window is quite easy, but I'm having some problems retrieving the handle from one of many child windows? So, if I have several child windows open in a parent window, how do I get the handle of only one child window?

Any help will be appreciated. Thanks!

Re: Handle for a child window?

Stephane Rodriguez.7-May-03 20:00

Re: Handle for a child window?

7-May-03 20:00

the Controls collection brings access to children. Controls.item[i].Handle is the window handle of the ith children.

LongRange.Shooter9-May-03 10:44

LongRange.Shooter

9-May-03 10:44

I had code where I needed to iterate through my children looking for replicated data being displayed between the child displays.

public void mdiParent_childLoadComplete(object sender, LoadCompleteEventArgs senderArgs)
{
    System.Windows.Forms.Form[] formArray = this.MdiChildren;
    int color = formArray.Length - 1;
    if (color < 1)
        return;
    editView newForm = new editView();

    // first : locate the form just built
    foreach (editView children in formArray)
    {
        if (children.Text == senderArgs.delegateIdentifier)
        {
            newForm = children;
            break;
        }
    }

_____________________________________________
_{The world is a dangerous place.
Not because of those that do evil,
but because of those who look on and do nothing.}

C++ define statements == what in C#?

dazinith7-May-03 9:38

dazinith

7-May-03 9:38

in C++ i would have something like this:

#define DIALUP 0
#define FTP 1
..
if (m_nAccessMode == FTP)
..

this was really useful for keeping track of options and such, like if im storing a combo box of Monthly,Quarterly,Annually i dont wanna just compare strings when im doing an if statement, but rather use some sort of defined key so that i never get my stuff mixed up..

i have looked at the #define statement in C# and it only lets me define like

#define FTP

it doesnt let me assign a value to it in the define statement, so i really dont even see its purpose Confused | :confused:

.. can someone set me straight plz?

still a newb.. cut me some slack :P
-dz

RB@Emphasys7-May-03 9:45

RB@Emphasys

7-May-03 9:45

it sounds like your trying to do an enumeration.
enum Days {Sat=1, Sun, Mon, Tue, Wed, Thu, Fri};

If you look it up at msdn youll be all set.

Ryan

dazinith7-May-03 9:54

dazinith

7-May-03 9:54

works great.. i see that i can use this outside of the class name, and inside the namespace such that i can use it throughout the namespace.. thats just what i needed, thanks a ton! Smile | :)

still a newb.. cut me some slack :P
-dz

leppie8-May-03 10:22

leppie

8-May-03 10:22

Any reasons C/C++ programmers steer away from enums? All I ever see is defines...

Hey leppie! Your "proof" seems brilliant and absurd at the same time. - Vikram Punathambekar 28 Apr '03

Kevin McFarlane9-May-03 1:00

Kevin McFarlane

9-May-03 1:00

In pure C programs you should expect to see lots of #defines.
In pure C++ programs you should expect to see none (it's poor practice - see http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.7[^]) but you often do.

Kevin

Windows.forms application

Kevin McFarlane8-May-03 0:32

Kevin McFarlane

8-May-03 0:32

This is actually bad practice in C++. You should use const declarations instead.

const int DIALUP = 0;

or enums, as another poster has suggested.

The #define in C# is for conditional compilation. And it should be used like this in C++ also.

See, for example, Scott Meyers's "Effective C++"

Kevin

viana7-May-03 8:19

viana

7-May-03 8:19

Hi, i'm starting C#, and i have a problem:
I'm developing a application that should open one "window", which should be created from a form that has buttons, like a menu selector. When i click the button it should open a new especific form, e.g. button 1 opens form1; button 2 opens form 2 ... That i can do, but i want to open it in the same "window", not openning a new window with my new form, an when i hit a save button i want to go to the previous form.

Can´t it be done???

thank for your time.

Stephane Rodriguez.7-May-03 8:43

7-May-03 8:43

It looks like a MDI app[^].

RB@Emphasys7-May-03 8:45

RB@Emphasys

7-May-03 8:45

It sounds like you want to create an MDI application. This gives you one main window while allowing you to open various child window applications. One of the authors on here wrote a cool little tutorial that should help you out.

Check out this link:
http://www.codeproject.com/csharp/mdiformstutorial.asp?target=mdi

Ryan

viana7-May-03 10:08

viana

7-May-03 10:08

Thanks for your sujection.
I tried it and hit worked.
I have a small question, how can i remove de icon in my child form?. I want to open it maximized without de maximize, minimize and close button, and change the menubar.

Thanks

RB@Emphasys7-May-03 10:17

RB@Emphasys

7-May-03 10:17

Its funny you say that, because I posted a question similar to that just a little while ago, here are a couple of solutions for you:
http://www.codeproject.com/script/comments/forums.asp?forumid=1649&select=491274&df=100&fr=51#xx490206xx

S. Rod gives you a great solution, I give a simple one.

Good luck, its titled form design quandries.

Good luck,
Ryan

Adam Turner7-May-03 12:33

Adam Turner

7-May-03 12:33

Instead of using MDI, you could create all of your "forms" as user controls and just handle their loading/unloading on the same form

viana7-May-03 22:10

viana

7-May-03 22:10

"
Instead of using MDI, you could create all of your "forms" as user controls and just handle their loading/unloading on the same form

"
Could you please send me a small example?

thanks

ctescu8-May-03 7:49

ctescu

8-May-03 7:49

It's more easy to use a panel in form and you cant make him on run-time
like this . In the dinamic construction the bad point is that the RAM is more use that for static declaration , but the diference is very small .

in Click event of the window make the code
{
Panel p=new Panel();
//give Panel properties

this.Controls.Add(p);
}

Saving Images

Steve McLenithan7-May-03 7:51

Steve McLenithan

7-May-03 7:51

I am trying save images from a website using the System.IO namespace. What classes should I be using?

Confused | :confused:

Steve
McLenithan

Is Bert Evil?

Re: Saving Images

Stephane Rodriguez.7-May-03 8:45

7-May-03 8:45

System.Drawing.Image.Save(...)

VC++ 6.0 && C#

NHM7-May-03 6:57

NHM

7-May-03 6:57

Greetings. I have an VC++ 6.0 App, and i'm moving to .NET. But i've chosen VC#. My question is. Is it possible to call a VC# dll from the VC++ 6.0 App? If it is, how can i do it? Thank u.

Confused | :confused:

Re: VC++ 6.0 && C#

Stephane Rodriguez.7-May-03 8:35