C / C++ / MFC

Re: Unable To Tackle MoveWindow()

5-Apr-12 19:51

hello guys... plz first consider this code.
<pre lang="c++">
void CMoveWindowDlg::MoveMyWindow()
{
CWnd* wind = GetDlgItem(IDC_UPDOWN); // Current button to which: this event handler is bound
ASSERT(wind!= NULL);
wind->GetWindowRect(&rect);

r.top = rect.top;
r.left = rect.left;
r.right = rect.right;
r.bottom = rect.bottom;

int height = rect.Height();
int width = rect.Width();
wind->MoveWindow(100, 100, width, height, 1);
}
</pre>
1 - Here I get the location and size in two things - RECT r, CRect rect. When I click on this button, it takes my button to the specified point. The problem is: if there is some other control already at that point like EditBox, this button will not work and the EditBox will come on top of it.
2 - I use another button to place this button back on the previous location by providing the location which I stored in Rect r, like this..
<pre lang="c++">GetDlgItem(IDC_UPDOWN)->MoveWindow(&r,1);</pre>
But unfortunately, this also does not place the buttun at its original place.

Problems are specified so whats wrong with this code?

Code-o-mat6-Apr-12 2:16

Code-o-mat

6-Apr-12 2:16

1 And what is your question?
2 This:

overloaded Name wrote:
wind->GetWindowRect(&rect);

will give you screen coordinates while this:

overloaded Name wrote:
GetDlgItem(IDC_UPDOWN)->MoveWindow(&r,1);

expects the coordinates to be in "client of the parent window space". Use e.g. ScreenToClient to convert screen coordinates to client coordinates of the parent window.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Why C++ Instead of C?

pix_programmer5-Apr-12 19:43

pix_programmer

5-Apr-12 19:43

Hi!
I've been asked in an interview whether we could do all the things that were possible in C++ in C also. I answered Yes. But the interviewer further asked why C++ if you can do all the things in C itself(Constructor, Destructor, Polymorphism,
Templates every thing is possible in C)? I don't know the answer. Can anybody explain?

AmbiguousName5-Apr-12 20:46

5-Apr-12 20:46

Well I mysellf am new to tech world but I think it depends upon feature that a particular language supports. To print something on screen you use
- printf("The Sum is: %d", sum)
in 'C'. But in C++, you dont have to worry about the datatype like
- cout<<"The Sum is: "<< sum;
So you see some laguages are easier to develop with. Moreover, almost anything that can be done in C++ can also be done in Java. But Java does not support pointers while C++ does. So does this make C++ a better / worse choice than Java? NO: it all depends on the problem that we are going to address and of course, our own choice as well.

pix_programmer5-Apr-12 21:09

pix_programmer

5-Apr-12 21:09

Any other answers?

AmbiguousName5-Apr-12 21:47

5-Apr-12 21:47

pix_programmer wrote:
Any other answers?

Thats is rude. I dont think I am going to get paid for sharing my thoughts with "your excellency". Poke tongue | ;-P

CPallini6-Apr-12 2:03

6-Apr-12 2:03

overloaded Name wrote:
Thats is rude.

Actually that's not so rude, because your answer is apparently incomplete. Poke tongue | ;-P

Veni, vidi, vici.

AmbiguousName6-Apr-12 2:28

6-Apr-12 2:28

but I think it depends upon feature that a particular language supports.

Thats what I wrote in first line. I think I should have replaced this line with: "Features such as OOP". I just said a more generalize sentence. I assumed OP knew that C++ was named "C With Classes" at first, but was renamed later.

CPallini wrote:
Actually that's not so rude

OK That is rude to some extent. Yet I confess my answer may have been incomplete and did not help, so no more replies from my side.

CPallini6-Apr-12 2:36

6-Apr-12 2:36

Don't get offended. I was joking, after all.
However introducing iostreams like one of major C++ achievements it is a common mistake.

Veni, vidi, vici.

softwaremonkey5-Apr-12 21:22

softwaremonkey

5-Apr-12 21:22

IMHO, the most compelling reason to use C++ rather than C is 'classes', allowing Object Oriented Programming (OOP). Classes makes code more structured, easier to write, understand and maintain (and more stable). This is important, especially with complex applications. Polymorphism and other features are nice extras but I wouldnt say to choose C++ just for these features alone.

CPallini5-Apr-12 21:36

5-Apr-12 21:36

The advantage of C++ over C is Object Oriented Programming (OOP). C++ supports OOP while C doesn't. That means you may write an OOP application in a fair clean and elegant way using C++ (you may write a C application following the OOP paradigms but your code would be more messy and your development time would be longer).
It is worthy nothing that OOP is not a panacea: it is best suited for rather big projects (say more than 100,000 lines of code) involving team of developers. Form smaller projects, in my opinion, OOP is overkilling and structured programming (the paradigm supported by the C language), is better.

Veni, vidi, vici.

modified 6-Apr-12 3:48am.

Erudite_Eric6-Apr-12 6:27

Erudite_Eric

6-Apr-12 6:27

Spot on answer. 5!

==============================

Nothing to say.

Stefan_Lang17-Apr-12 2:34

Stefan_Lang

17-Apr-12 2:34

Agreed on pretty much anything, except that I consider 100,000 lines rather small, and don't see any advantage in using C over C++ on smaller projects, as long as there are at least two developers working on it. OOP and the stricter syntax of C++ is great for avoiding errors based on misunderstandings of code use.

CPallini17-Apr-12 3:10

17-Apr-12 3:10

Stefan_Lang wrote:
Agreed on pretty much anything, except that I consider 100,000 lines rather small

Well C and C++ are pretty concise languages.
Of course you may feel 100,000 'small' (I feel it 'large'), however, probably 10^5 is the right order of magnitude.

Stefan_Lang wrote:
and don't see any advantage in using C over C++ <layer>on smaller projects, as long as there are at least two developers working on it. OOP and the stricter syntax of C++ is great for avoiding errors based on misunderstandings of code use.

I think structured programming is better than OOP for small projects.
You may use C++ (as 'better C') with the structured programming paradigm, of course.

Veni, vidi, vici.

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C^hris L^osinger6-Apr-12 1:33

C^hris L^osinger

6-Apr-12 1:33

in terms of program output, yes, C can do everything C++ does. but C++ makes OOP much easier.

Member 19886-Apr-12 22:49

Member 1988

6-Apr-12 22:49

you can do all the things in C itself(Constructor, Destructor,
Polymorphism,
Templates every thing is possible in C) -

All the things that performed by compiler you should do by yourself.(for example constructor - init, etc)
Templates may be the thing - that really hard to performed - but generally macro can be used

Why C++ Instead of C - some of the features realized and checked by compiler.
but from the other side for C there are - small footprint,speed and etc.
like assembler and C.
At the end it is binary code.