C / C++ / MFC

6-Mar-03 12:55

Someone please tell me what classes and DLLs do. Thanks.

DREVET Olivier6-Mar-03 13:14

DREVET Olivier

6-Mar-03 13:14

A DLL is a compiled "executable" (not directly) exporting function that one or more applications may call. Since applications are sharing DLLs, if you change a function in the DLL, all the applications will "change" if they call the modified function.

A class is a structure containing function and member variables, who may by instanciated one or more times in objects. To understand the difference between classes and objects, try to remember this comparaison with cook : the class is used to make cakes, objets are cakes.

Then, imagine your class have a function called EatPie() and you have instanciated 3 objects. For each object, you may call EatPie() and potentially decrease a counter counting the number of pie of each cakes.

Since I can't spend more time to explain you classes and DLL, I recommend you to read books or parse the Web about infos.

Cheers,

Florian

Anonymous6-Mar-03 13:25

6-Mar-03 13:25

classes are where you go to learn things, like what a DLL does.

Nish Nishant6-Mar-03 13:48

Nish Nishant

6-Mar-03 13:48

Anonymous wrote:
classes are where you go to learn things, like what a DLL does.

Big Grin | :-D

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Anonymous6-Mar-03 14:11

6-Mar-03 14:11

hahaha real funny u make it obvious that you dont know either Big Grin | :-D

Moak6-Mar-03 14:30

Moak

6-Mar-03 14:30

Anonymous wrote:
classes are where you go to learn things, like what a DLL does.

Smile | :)

Joan M9-Mar-03 21:38

Joan M

9-Mar-03 21:38

CLASS:
---------------------------------
DEFINITION:
declaration of an object.

EXPLANATION:
Imagine a button, a button has a color, a text and an icon (all those parameters are member variables of the button class).
A button also have a function that is called when the button is pressed (a member function).

SAMPLE:

class cbtn
{
private:
  COLORREF m_clrColor;  // Member variable...
  CString m_csText;     // Note that members have a "m" at it's beginning (it's only a way to see faster that they are members)
  CIcon m_Icon;

  void OnClick();       // A class is like a struct but it can contain functions too...
};

Once you have the class declared, you can instantiate (define - create objects of) that class so many times...

DLL:
---------------------------------
DEFINITION:
executable that exports functions and variables to other executables.

EXPLANATION:
You can build dll's or use other dll's that are installed in your computer, those programs can be used from any program that knows how to call their functions or variables...

imagine that you create always a program that (it's just an explanation and the sample will be very stupid) add two numbers and the code to do so is very long (I adviced you that that would be stupid...) then you could consider to place that code in a DLL and call that code from your programs...

FINALLY
---------------------------------
To go to class to learn is interesting if you can't do it, think of reading a good C++ book for learning about classes and another Windows programming book for DLL's...

Hope this helps...

PS:
the samples are just introductory and they have my point of view, they are not the purest and best ones, but they can help you to get the starting point when reading some info regarding this.

NOTE:
my english is not my best.

Hope this helps...

How to start under .NET

Anonymous6-Mar-03 12:54

Re: How to start under .NET

6-Mar-03 12:54

Ok, This is the same pathetic person who could not get his window app to work. It now works. To whoever told me about the 4 platforms, I think I will go with .NET. I was using MS Visual C++ .NET 2003 and none of my programs would compile. I am wondering why. Even a simple hello world app would not work. Please tell me a bit about .NET since i would like to use that. thanks.

Nish Nishant6-Mar-03 13:47

Nish Nishant

6-Mar-03 13:47

http://www.codeproject.com/dotnet/dotnet.asp

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

How to retrieve CColorDlg "Basic colors" palette?

Bartosz Bien6-Mar-03 12:29

Bartosz Bien

6-Mar-03 12:29

I need to retrieve CColorDlg "Basic colors" palette. The custom colors are placed in CHOOSECOLOR structure - how can I get the basic colors?

Regards,
BB

Hiding text in a CStatic control

work_to_live6-Mar-03 10:18

work_to_live

6-Mar-03 10:18

It would be nice if I could hide some text in a static control. I experimented a bit, and it looks like anything inserted after a \n is not displayed.

I'm wondering if that's a predictable behaviour, or might it be a function of my particular setup. If it's predictable, and safe, I'll go ahead and use it.

Any thoughts?

Stefan Pedersen6-Mar-03 10:28

Stefan Pedersen

6-Mar-03 10:28

Why not use a hidden static? Though I must say that trying to "hide" something in the GUI sounds like a bad idea...

"was wir auch tun, wohin wir gehen
die illuminaten sind im system
sie kontrollieren überall
und 23 ist ihre zahl!"
23, welle: erdball

Dave Bryant6-Mar-03 10:40

Dave Bryant

6-Mar-03 10:40

It's not really hidden - your static control is probably only high enough to see the first line. Try expanding it, and you'll probably see the rest.

Dave

work_to_live6-Mar-03 11:15

work_to_live

6-Mar-03 11:15

You're right! It's probably reasonably predictable behaviour.

Thanks.

Dave Bryant6-Mar-03 11:46

Dave Bryant

6-Mar-03 11:46

But it's still not really hidden. If the user has Spy (or something similar) installed, they can trivially retrieve the hidden text. The GetWindowText() API will also return the full text in the control, even if called from another process.

Dave

work_to_live7-Mar-03 11:00

work_to_live

7-Mar-03 11:00

The intent was not to hide it as much as it was to encode some additional information in the text that the user wouldn't want to see. It's a long story... Smile | :)

A goto box

Anonymous6-Mar-03 10:08

6-Mar-03 10:08

How to scroll to the line we want?

Christian Graus6-Mar-03 10:29

Christian Graus

6-Mar-03 10:29

What the hell are you talking about ?

Christian

NO MATTER HOW MUCH BIG IS THE WORD SIZE ,THE DATA MUCT BE TRANSPORTED INTO THE CPU. - Vinod Sharma

Anonymous wrote:
OK. I read a c++ book. Or...a bit of it anyway. I'm sick of that evil looking console window.

I think you are a good candidate for Visual Basic. - Nemanja Trifunovic

Tim Smith6-Mar-03 10:31

Tim Smith

6-Mar-03 10:31

My guess scrolling an edit/multiline static to a specific line.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Nish Nishant6-Mar-03 12:29

Nish Nishant

6-Mar-03 12:29

Good to see that you've corrected the non-working link in your sig Smile | :)

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Moak6-Mar-03 15:15

Moak

6-Mar-03 15:15

.oO(how can I put Christian on my ignore list)

Christian Graus6-Mar-03 15:20

Christian Graus

6-Mar-03 15:20

Easy - go to Code Guru.

Did you ask the question ? Or are you just on the same level as the answer, and so the question actually made sense to you ?

Christian

NO MATTER HOW MUCH BIG IS THE WORD SIZE ,THE DATA MUCT BE TRANSPORTED INTO THE CPU. - Vinod Sharma

Anonymous wrote:
OK. I read a c++ book. Or...a bit of it anyway. I'm sick of that evil looking console window.

I think you are a good candidate for Visual Basic. - Nemanja Trifunovic

Moak6-Mar-03 15:23

Moak

6-Mar-03 15:23

.oO(sigh)