C / C++ / MFC Discussion Boards

kevincwong15-Jan-06 19:45

15-Jan-06 19:45

There are many reasons to use
#if 0

Actually, I do it all the time.

Here is my reason.

Let say I re-write some code/method/function
and I think it should work.
But I would like to keep the old code
around. Just in case......

I know I can retrieve the old code
from the source control. However, it's
more convinence if I have the old
code right next to the new code.

Kevin

Re: What is #if 0

Stephen Hewitt15-Jan-06 19:55

Stephen Hewitt

15-Jan-06 19:55

I hate #if 0 Mad | :mad:

. It's not so bad if the code commented out is small, but when large pieces of code are bracketed with these you can find yourself analyzing code only to find, when you get to the top, that you've been wasting your time and the code isn't even part of the product. This has happened to me many times. If the programmer simply commented it out the syntax highlighting will stop such problems from ever occurring.

Steve

Re: What is #if 0

toxcct15-Jan-06 21:51

toxcct

15-Jan-06 21:51

Stephen Hewitt wrote:
I hate #if 0

me too.

i use this purpose instead...

#ifdef DEBUG
    #define DPRINT printf
#else
    void DPRINT(...) {}
#endif

this way, in debug mode, we could DPRINT() something, which will not been took in account in release mode (and more, the compiler will optimize a call to DPRINT() in release).
for instance :

int Foo() {
    DPRINT("Foo()\n");
    int i = 654;
 
    // modification of i...
 
    DPRINT("Foo output : %d\n", i);
    return i;
}

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

Re: What is #if 0

Prakash Nadar15-Jan-06 21:52

Prakash Nadar

15-Jan-06 21:52

you can #if 0 the code which needs to be ignored in both debug and release build, i.e. older logic to solve a problem, etc.

-Prakash

Re: What is #if 0

kvprasad15-Jan-06 22:07

kvprasad

15-Jan-06 22:07

Yes steve u r definetly correct. But this is not supposed to be used to large chunks of code. it is more of an debugging approach than just saving old code.

Tip: Always it is a good option to try to put a breakpoint to know if this code is compiled or not. a breakpoint cannot be inserted in any code that is not compiled.

Hope this helps.

kvprasad
your future is what you think

Re: What is #if 0

David Crow16-Jan-06 3:06

David Crow

16-Jan-06 3:06

Stephen Hewitt wrote:
If the programmer simply commented it out...

But nested comments are not allowed. That's where #if 0 is of use.

"The words of God are not like the oak leaf which dies and falls to the earth, but like the pine tree which stays green forever." - Native American Proverb

Re: What is #if 0

Stephen Hewitt16-Jan-06 11:27

Stephen Hewitt

16-Jan-06 11:27

True.

Steve

Re: What is #if 0

Phil J Pearson17-Jan-06 3:09

Phil J Pearson

17-Jan-06 3:09

I agree that large blocks of #if 0'd code are annoying but VS2005 improves things a lot by greying it out. It even greys out (for example) #ifdef _DEBUG blocks when _DEBUG is not defined.

The opinions expressed in this communication do not necessarily represent those of the author (especially if you find them impolite, discourteous or inflammatory).

Re: What is #if 0

Shraddhan22-Jan-06 22:42

Shraddhan

22-Jan-06 22:42

I believe that in Visual C++ 6.0 there is a key combination that will take you to / from
#if
and
#endif

but Microsoft in their 'wisdom' removed this very handy functionality from VC++.NET 2001. Yes, thanks Microsoft...

Personally, when I need to comment out large chunks of code, I use

#if defined dfkagtljarogh
#end if // defined dfkagtljarogh

where dfkagtljarogh is the result of some random keystrokes. Copy and paste to make sure that two instances match, and then it is not too bad to use Find to jump from beginning to end or vice versa.

And as for being unable to nest /* ... */ comments in C++, this is an abomination that should never have been put into the language. Is there any reason whatsoever why C++ (or C even) HAVE TO REFUSE to allow such useful nested comments?

Thanks again, Microsoft. Some C++ compilers do allow this.

Shraddhan

Re: What is #if 0

Prakash Nadar22-Jan-06 23:29

Prakash Nadar

22-Jan-06 23:29

Shraddhan wrote:
And as for being unable to nest /* ... */ comments in C++, this is an abomination that should never have been put into the language. Is there any reason whatsoever why C++ (or C even) HAVE TO REFUSE to allow such useful nested comments?

yes i agree with you and that is one thing that I hate in VC++ compiler.

-Prakash

[Message Deleted]

Divyang Mithaiwala15-Jan-06 22:04

Divyang Mithaiwala

15-Jan-06 22:04

[Message Deleted]

Re: What is #if 0

Maximilien16-Jan-06 1:11

Maximilien

16-Jan-06 1:11

Maximilien Lincourt
Your Head A Splode - Strong Bad

WEBSERVER for ASP

shadrach_india15-Jan-06 18:41

shadrach_india

15-Jan-06 18:41

I have small webserver which is able to handle html files only by default. But now I need to enable it to process ASP page. Is it possible or is any component available ? Smile | :)

Re: WEBSERVER for ASP

Prakash Nadar15-Jan-06 19:27

Prakash Nadar

15-Jan-06 19:27

which webserver are you talking about ?

it would depend if that webserver has support for ASP or has plugins to process ASP.

IIS has ASP engine that can be installed to process ASP.

-Prakash

Re: WEBSERVER for ASP

shadrach_india15-Jan-06 19:47

shadrach_india

15-Jan-06 19:47

I have source code of a simple web server. So I have my own web server. Now I want my web server to process ASP coding. I should not install IIS/PWS.

Re: WEBSERVER for ASP

Prakash Nadar15-Jan-06 21:51

Prakash Nadar

15-Jan-06 21:51

Like I said your new webserver should provide a plugin to process the ASP script.

like you said it is a simple webserver, it has probably just implemented the HTTP protocol, i.e. deliver the content on clients request.

-Prakash

help needed for VS2005 add-in using native c++

Saurabh.Garg15-Jan-06 18:26

Saurabh.Garg

15-Jan-06 18:26

I am trying to develop custom visualizers for native code in Visual Studio 2005. As I understand they were available for native code in beta's but were removed from release version.

So I am thinking to add a custom menu in code window contextmenu, hook with debugger, get the data for selected variable, identify type using RTTI or provide a dialog where user can enter types and then render it. Is this approach fesiable?

Another problem I have is there is not enough documentation for extending VS IDE using native code. So right now I am not even able to add a context menu on right click. I can see the menu I am trying to add sometimes but add-in always crashes. I tried articles on CP and none of them added a context menu in native code. Any pointers or advice for articles or samples will be much appreciated.

thanks,
-Saurabh

Re: help needed for VS2005 add-in using native c++

MF15-Jan-06 19:48

15-Jan-06 19:48

I have tried a product called 'Visual Watch' which provides such functionalities. But it doesn't support VS 2005 yet.

Re: help needed for VS2005 add-in using native c++

Saurabh.Garg15-Jan-06 19:53

Saurabh.Garg

15-Jan-06 19:53

does it support adding user defined classes or structures.

thanks,
Saurabh

How to visible the background buttons when I change the back ground color

S_a_n15-Jan-06 18:20

S_a_n

15-Jan-06 18:20

I have 10 button controls, when iam changing the back ground color of the main window, all the button controls in the main window are not visible, My question is How ro make the transparent back ground so that all the button controls should be visible..

Please send me if any ....its very urgent..

Re: How to visible the background buttons when I change the back ground color

Owner drawn15-Jan-06 18:27

Owner drawn

15-Jan-06 18:27

S_a_n wrote:
when iam changing the back ground color of the main window

How are you changing the background color of the main window.

Jesus Loves Rose | [Rose]

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

Re: How to visible the background buttons when I change the back ground color

S_a_n15-Jan-06 18:44

S_a_n

15-Jan-06 18:44

with the help of FillRect() function..by getting the DC and rectangle of the main window...

Don't use FillRect() there

Owner drawn15-Jan-06 18:47

Owner drawn

15-Jan-06 18:47

S_a_n wrote:
with the help of FillRect() function

Aha,

Here is the problem. Don't do background erasing like that.

Do background erasing in WM_ERASEBKGND handler. And return TRUE after you finish.

Jesus Loves Rose | [Rose]

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

Re: Don't use FillRect()

S_a_n15-Jan-06 18:51

S_a_n

15-Jan-06 18:51

Could you plz send any sample code...by creating one button in the main window...and changing the background of the main window into transparent....so that the button will visible?

Re: Don't use FillRect()

Owner drawn15-Jan-06 18:55

Owner drawn

15-Jan-06 18:55

BEGIN_MESSAGE_MAP(CMsgTesterView, CFormView)
        //...other map entries
	<code>ON_WM_ERASEBKGND()//yeap here is it.</code>
END_MESSAGE_MAP()

BOOL CYourView::OnEraseBkgnd(CDC* pDC)
{
	RECT r;
	GetClientRect(&r);
	pDC->FillSolidRect(&r, RGB(120,230,120));//:cool: gives a light green color
	return TRUE;
}

Jesus Loves Rose | [Rose]

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

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