C / C++ / MFC

Re: Visual Studio 6 - helpful debugger?

19-Sep-08 6:49

charlieg wrote:
debuggers help sometimes by initializing data in debug mode.

I don't think debuggers change your data, but debug libraries
may initialize data.

If a breakpoint/run sequence makes something draw correctly, often
it's just a case where you needed to invalidate the window and/or
call UpdateWindow().

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

charlieg21-Sep-08 2:54

charlieg

21-Sep-08 2:54

Mark,

Oh I wish it were so simple as an invalidate. I have had debuggers help me in the past, but this issue just gets weirder.
At this point, I have OnSize, OnPaint and OnDraw. They all call GetClientRect to determine what needs to be drawn. Only OnSize tracks correctly. So, I have something seriously wrong in the control, perhaps a misunderstanding between me, the control and it's container.

cg

atof() in Visual Studio 6 vs 2005

FoxholeWilly18-Sep-08 10:38

18-Sep-08 10:38

I have some code originally developed in VS6. The boss wants it to run under VS2005, and I found some problems with atof(buffer).

Buffer is read from an ASCII file, and in VS6 everything goes fine, but in VS2005 its messed up:

buffer is "409600.0000"

in watch window atof(buffer) shows value of 409600.00000000

BUT when I assign to a double variable:

DOUBLE variable = atof(buffer) I get 101523136.0000000

Any help fixing this would be appreciated.

Mark Salsbery18-Sep-08 10:48

18-Sep-08 10:48

hmm...

What do you get with this:

// Non-Unicode
char charbuffer[] = "409600.0000";
double doublefromchar = atof(charbuffer);

// Unicode
wchar_t wcharbuffer[] = L"409600.0000";
double doublefromwchar = _wtof(wcharbuffer);

// Generic text
TCHAR tcharbuffer[] = _T("409600.0000");
double doublefromtchar = _tstof(tcharbuffer);

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

FoxholeWilly18-Sep-08 12:16

18-Sep-08 12:16

Compiler did not like TCHAR

Still get the same results.

When looking at atof() and _wtof() in the watch window, the results are both 409600.0000

The double variables both show 101523136.00000000 in the watch window.

So, the atof() and _wtof() functions seem to work correctly, its just that when the values are assigned to the variables, things are getting messed up.

Mark Salsbery19-Sep-08 5:03

19-Sep-08 5:03

FoxholeWilly wrote:
Compiler did not like TCHAR

#include <tchar.h>

FoxholeWilly wrote:
When looking at atof() and _wtof() in the watch window, the results are both 409600.0000

The double variables both show 101523136.00000000 in the watch window.

That doesn't make sense. How do you watch the functions?

I fired up VS 2005 and wrote this:

#ifndef _WIN32_WINNT 
#define _WIN32_WINNT 0x0501
#endif						

#include <stdio.h>
#include <tchar.h>
#include <math.h>
#include <stdlib.h>


int _tmain(int argc, _TCHAR* argv[])
{
	// Non-Unicode
	char charbuffer[] = "409600.0000";
	double doublefromchar = atof(charbuffer);

	// Unicode
	wchar_t wcharbuffer[] = L"409600.0000";
	double doublefromwchar = _wtof(wcharbuffer);

	// Generic text
	TCHAR tcharbuffer[] = _T("409600.0000");
	double doublefromtchar = _tstof(tcharbuffer);

	return 0;
}

I can't reproduce anything you are seeing...you've got something
else going on you're not showing us.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

CPallini18-Sep-08 11:31

CPallini

18-Sep-08 11:31

As Mark suggested it is probably a UNICODE issue (VS2005 by default makes UNICODE builds). Could you please post the relevant code.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

FoxholeWilly18-Sep-08 12:22

18-Sep-08 12:22

note: frequency represents the real-life typedef where the pertinant variable is declared as double.

char buf[80];
FILE* fp;
double frequency;

....

fgets(buf, 80, fp);
frequency = atof(buf);

....

CPallini18-Sep-08 22:18

CPallini

18-Sep-08 22:18

Visual Studio 2005:

The program

#include <stdio.h>
#include <stdlib.h>

void main()
{
  char buf[] = "409600.0000";
  double frequency;
  frequency = atof(buf);
  printf("%g\n", frequency);
  getchar();
}

The output

What happens if you run this program on your VS2005?
Smile | :)

Mark Salsbery19-Sep-08 4:46

19-Sep-08 4:46

CPallini wrote:
What happens if you run this program on your VS2005?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

FoxholeWilly22-Sep-08 5:27

22-Sep-08 5:27

Found the prob. Was missing a header, stdlib.h fixed the problem.

unordered_set

steph518-Sep-08 9:23

<unordered_set></unordered_set>

18-Sep-08 9:23

I am using Visual Studio 2005.
And I want access to unordered_set storage containers.

They are apparently in TR1. whatever that is?

How can I be able to use them in my program?

Thanks

Re: unordered_set

Randor 18-Sep-08 10:04

Randor

18-Sep-08 10:04

steph5 wrote:
They are apparently in TR1. whatever that is?

TR1 is a document describing proposed extensions to the C++ standards. You can read more here:
http://en.wikipedia.org/wiki/Technical_Report_1[^]

steph5 wrote:
How can I be able to use them in my program?

The TR1 extensions were not included in Visual Studio 2005. If you wish to use unordered_set you may take the following avenues of recourse:

1.) You could use the Boost implementation available here: http://www.boost.org/doc/libs/1_35_0/doc/html/intrusive/unordered_set_unordered_multiset.html[^]
2.) You could purchase the Dinkumware implementation which is actually what Microsoft used in VC2008http://www.dinkumware.com/tr1.aspx[^]
3.) You could purchase VC2008

If you simply want to do experiments with unordered_set storage containers then perhaps you could perform them with the GCC compiler. The libstdc++ library has implemented most of TR1 available here: http://gcc.gnu.org/libstdc++/[^]

Best Wishes,
-David Delaune

steph518-Sep-08 8:37

18-Sep-08 8:37

Hi I'm a novice so excuse the basic questions!

I have Visual Studios 2005
And I want to use <unordered_set>.
Its not included it my list of include files.

Apparently it is in TR1 what ever that menans Confused | :confused:

How do I go about getting the files so that I can use unordered sets in the code I am trying to write

Many thanks for your time.

Mark Salsbery18-Sep-08 8:42

18-Sep-08 8:42

steph5 wrote:
I'm a novice

Step 1: Put a subject on your post so people can click on it! Smile | :)

steph5 wrote:
And I want to use .

Want to use what?

steph5 wrote:
Apparently it is in TR1

I believe TR1 support was first added in the feature pack for Visual Studio 2008.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

steph518-Sep-08 9:13

18-Sep-08 9:13

Lets try that agaiin!!!!

I can't even post a message. What chance do I have trying to program Smile | :)

I am trying to get unordered_set on my machine.

how can I get it?

p.s. if you put < and > it doesn't post in??

Mark Salsbery18-Sep-08 9:30

18-Sep-08 9:30

steph5 wrote:
I am trying to get unordered_set on my machine.

You won't get it with Visual Studio 2005 (it's there in VS 2008 SP1).

You may want to try the Boost libraries[^]

steph5 wrote:
p.s. if you put < and > it doesn't post in??

Not always - the text is interpreted as HTML and < starts an HTML tag.

In the formatting row below the editor window you'll find buttons to insert
< and >, or you can type the HTML for them yourself.

(this is pretty much the ONLY thing that really bugs me on this site...
I shouldn't have to go through and fix my posted code on a site with code
in the name... not all of us are HTML "programmers" Smile | :)

)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

steph518-Sep-08 9:39

18-Sep-08 9:39

Many Thanks for your time and patience Big Grin | :-D

Rajesh R Subramanian18-Sep-08 21:56

Rajesh R Subramanian

18-Sep-08 21:56

Mark Salsbery wrote:
not all of us are HTML "programmers"

So, the HTML guys insist on calling themselves as "programmers"? WTF. I need a hammer.

Many are stubborn in pursuit of the path they have chosen, few in pursuit of the goal - Friedrich Nietzsche

.·´¯`·->Rajesh<-·´¯`·.
[Microsoft MVP - Visual C++]

Mark Salsbery19-Sep-08 5:09