C / C++ / MFC

Re: Edit mode problem [modified]

19-Sep-08 6:46

I use an enumeration.

The if/else or switch code to check the mode is insignificant
relative to the slowness of mouse messages...there's no performance
issues on a modern PC if that's what you're worried about.

Mark

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

followait19-Sep-08 14:14

followait

19-Sep-08 14:14

I'm not worried about performance.
I don't want the message handler like a native window proc funciton.
(a big switch)

system

modified on Friday, September 19, 2008 8:34 PM

Print after add view

Max++18-Sep-08 15:46

Max++

18-Sep-08 15:46

My project is SDI that first view is CFromView derive class.
Then I add second view with CScrollView derive class.
In this view I want to print out the data but I don't know how to do that.

Please advise me how can I do.

Re: Print after add view [modified]

followait18-Sep-08 16:52

followait

18-Sep-08 16:52

Try to associate your 2nd view with the doc at first,
It it very likely to solve the problem.

If your demand is very specific,
try to handle the print message in CView2 by yourself,
you may call CView2::OnDraw in the print handler.

system

modified on Friday, September 19, 2008 5:34 AM

Manifest File

Bram van Kampen18-Sep-08 15:08

Bram van Kampen

18-Sep-08 15:08

I copied the Manifest example from the MSDN site, and included it as an XML resource in my code, to represent generic elevated rights. Now, my rc compiler is old, and knows Nothing about XML, but my Linker knows about '.res' files.
Would anyone be willing to compile a Generic Manifest into an rc File for me, so that I can include it in my code.
Anyone willing to assist may contact me at:
bramvankampen@aol.com

Regards, Smile | :)

Bram van Kampen

Multi Threaded debug question

monsieur_jj18-Sep-08 14:29

monsieur_jj

18-Sep-08 14:29

Hi all,

Whats the difference between these:

Multi-threaded Debug (/MTd)

Multi-threaded (/MT)

Multi-threaded DLL (/MD)

Multi-threaded Debug DLL (/MDd)

I am currently using
Multi-threaded Debug (/MTd) in my project because I encountered an mfc error message when I used Multi-threaded Debug DLL (/MDd). Please Advise because I haven't seen how it affects my project.

Thanks,
Jayjay

Re: Multi Threaded debug question

Saurabh.Garg18-Sep-08 15:03

Saurabh.Garg

18-Sep-08 15:03

They refer to different types of C Run-Time Libraries[^].

-Saurabh

Visual Studio 6 - helpful debugger?

charlieg18-Sep-08 12:18

charlieg

18-Sep-08 12:18

So, I'm trying to track down a bug in an activeX control I'm working on. I'm supposed to be centering text, the text is no where to be seen. Hmm, should be able to find this pretty quick. Sniff | :^)

So, I set a breakpoint at the start of the offending method, walk through the code, all looks well. I hit go, and all is drawn correctly. Hmmm, so I leave the breakpoint off, and now it draws incorrectly.

Then it dawns on me - hit a breakpoint and things draw correctly. WTF | :WTF:

I know debuggers help sometimes by initializing data in debug mode. I've never heard of one doing things when a breakpoint is reached. Any ideas?

Charlie Gilley
Will program for food...
<italic>Hurtling toward a government of the stupid, by the stupid, for the stupid we go. —Michelle Malkin

Re: Visual Studio 6 - helpful debugger?

Mark Salsbery19-Sep-08 6:49

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