Is it code optimization problem ? - C / C++ / MFC Discussion Boards

Re: C++ syntax question

Nishad S27-Apr-06 19:09

Nishad S

27-Apr-06 19:09

includeh10 wrote:
how to solve the problem to let the class contain constructor to initialize data?

I didn't understand what u really needed. Anyway u can solve it by just changing the constructor like this Wink | ;)

NNN(int)
{
 memset(&ia,100,sizeof(ia));
}

- NS -

Re: C++ syntax question

includeh1027-Apr-06 19:37

includeh10

27-Apr-06 19:37

NS17 wrote:
didn't understand what u really needed

so delete your reply to make the post clear.

Re: C++ syntax question

toxcct27-Apr-06 22:28

toxcct

27-Apr-06 22:28

are you on drugs ? Unsure | :~

Re: C++ syntax question

Michael Dunn27-Apr-06 19:46

Michael Dunn

27-Apr-06 19:46

Once you add a ctor, you can't use the array initialization syntax. Do it like this:

NNN foo[] = { NNN(), NNN() };

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: C++ syntax question

Nishad S27-Apr-06 20:15

Nishad S

27-Apr-06 20:15

Michael Dunn wrote:
NNN foo[] = { NNN(), NNN() };

What is the need of that? NNN foo[2] is enough, isn't it?

- NS -

Re: C++ syntax question

Michael Dunn27-Apr-06 20:37

Michael Dunn

27-Apr-06 20:37

NS17 wrote:
NNN foo[2] is enough, isn't it?

Yes, if the default ctor is sufficient. The OP asked about initializing the objects in an array at the time that the array is created.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: C++ syntax question [Edited]

Maxwell Chen27-Apr-06 20:14

Maxwell Chen

27-Apr-06 20:14

The code below compiles and works fine.

[Edited] When you use memcpy in your original version, you will see

nnn[0].ia[0] = 0x0a0a0a0a;
nnn[0].ia[1] = 0x0a0a0a0a; 
// ....
nnn[1].ia[0] = 0x14141414;
// ....

[/Edited]

class NNN
{
  enum { size = 100 };
  int ia[size];
public:
  NNN(int n) {
    for(int i = 0; i < size; i++) {
      ia[i] = n;
    }
  }
};

int main()
{
  NNN  nnn[]={ 10, 20, 30 };
  return 0;
}

Maxwell Chen

-- modified at 2:17 Friday 28th April, 2006

Is it code optimization problem ?

dharani27-Apr-06 16:28

dharani

27-Apr-06 16:28

Hello all
I have several binaries say ProductA1.exe ,ProductA2.exe and ProductA3.exe . My question is about a piece of code in all these binaries.(Though the binaries A2 and A3 differ in some other .cpp files , the code I am pasting below is exactly the same in all of them ..)

Purpose of the code : This code launches a .chm help file .

Code :
FunctionOne()
{
.....
.....
if(dwData != 0)
{
if(HtmlHelp(hwndCaller,
lpszHelpFile,
HH_HELP_CONTEXT,
dwData) == NULL)
{
HtmlHelp(hwndCaller,
lpszHelpFile,
HH_HELP_CONTEXT,
(DWORD)HELPID_ABOUT);
}
}
else
{
HtmlHelp(hwndCaller,
lpszHelpFile,
HH_DISPLAY_TOC,
(DWORD)HELPID_ABOUT);

}

.....
}

Problem : When I launch ProductA1.exe , the .chm file is not launched as the code enters the block if(dwData!=0) . But when I launch ProcuctA2.exe the help file is started . But in ProductA3.exe it again does not work !!!!
So I set active config as "Debug" and debugged the relevantfile.cpp and found that it works fine . But surprisingly only once I was able to reproduce the problem . ie => The same lines of code were executed and HtmlHelp( ) function was called but there was no help file shown on screen !!! . The behaviour same like ProductA1 and ProductA3 release EXEs.

So I set active config as "Release" and debugged (with "generate debug info" on in settings) again the beahvior is good !!
I put a dialog box inside the if blocks and replaced the my release exe with ProductA1 and ProductA3.exe , it works fine .

My question : Is it code optimization problem ? I can disable optimization using #pragma optimize ("", off) . But I strongly feel it is not code optmization problem becasue , i have seen variable values becoming junk in release and not in debug .
But in my case the sames EXEs are differing in behavioir .And also the behavior is confusing . And surprisingly when i started help from my collegues systems the help starts in all EXEs !! All the systems have XP SP2 1 GB RAM.

Can anyone throw any ideas ?

redindian

-- modified at 22:29 Thursday 27th April, 2006

Re: Is it code optimization problem ?

Renjith Ramachandran27-Apr-06 20:04

Renjith Ramachandran

27-Apr-06 20:04

problem is with your code only, seems it works in debug and not in release!!! watch your code closely for any chance in loosely handled memory. or just share your code, it is a debugging challenge...!!!!

Loka Samastha Sukhino Bhavanthu..!!!
( May all beings be happy and free )

How to drag and drop CListCtrl header?

Ajax9527-Apr-06 14:07

Ajax95

27-Apr-06 14:07

I set the style of my list
m_list.SetExtendedStyle(m_list.GetExtendedStyle()|LVS_EX_HEADERDRAGDROP);
But everytime after I drag and drop a header, for example drag column 1 to column 2. The data area moved as well and it starts from column 2, column 1 area becomes empty, all data moved to column 2 & 3, some of them mixed together. Is there any other style I should set or any additional code I should wrote?
Confused | :confused:

Thanks!

Re: How to drag and drop CListCtrl header?

Naveen27-Apr-06 17:30

Naveen

27-Apr-06 17:30

R u owner drawing the list control?

nave

Why does VC++ 2005 produce much larger EXE's than VC++ 2003 or VC++ 6.0 ?

Defenestration27-Apr-06 13:45

Defenestration

27-Apr-06 13:45

For example, using the example project WTL for MFC part 1 (http://www.codeproject.com/wtl/wtl4mfc1.asp[^])

Smallest Release EXE I could get for VC++ 2005 was about 55KB compared to 28KB for VC++ 2003 and 34.5KB for VC++ 6.0.

What's the reason for it ?

Re: Why does VC++ 2005 produce much larger EXE's than VC++ 2003 or VC++ 6.0 ?

Michael Dunn27-Apr-06 19:49

Michael Dunn

27-Apr-06 19:49

My guess is extra security features build into the CRT library. That requires more code, so you get larger binaries.
If VC8 still supports the linker switch /opt:nowin98 don't forget to add that, as it will usually reduce the binary's size a bit.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: Why does VC++ 2005 produce much larger EXE's than VC++ 2003 or VC++ 6.0 ?

Defenestration2-May-06 16:12

Defenestration

2-May-06 16:12

Is there any way to remove these extra security features since it does seem to add a hefty chunk extra onto each compiled app ?

Or would it be OK to use the CRT library from VC++ 2003 ?

If so, which file(s) should I replace ?

File's properties - Rt click, Summary

john john mackey27-Apr-06 12:32

john john mackey

27-Apr-06 12:32

Hi,
I tried to search for this in MSDN, but was unsuccessful after 30 minutes of trying....

Does anyone know how to access a file's Properties - like when you Right Click a .TXT file, and then click the Summary tab....

I want to programmatically put my own info in the Summary fields for:

1) Title
2) Author
3) Comments

... and do it all from my VC++ (MFC) code.

Thanks,
Johnny

Re: File's properties - Rt click, Summary

valikac27-Apr-06 12:44

valikac

27-Apr-06 12:44

msdn

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/resources/versioninformation.asp[^]

my website software development links

http://www.dslextreme.com/users/kuphryn/links.html[^]

Kuphryn

Re: File's properties - Rt click, Summary

Hamid_RT28-Apr-06 1:47

Hamid_RT

28-Apr-06 1:47

john john mackey
I saw your answer in codeproject but i'm sorry i dont know address

Re: File's properties - Rt click, Summary

David Crow28-Apr-06 2:53

David Crow

28-Apr-06 2:53

That's "compound document" information. See here.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: File's properties - Rt click, Summary

john john mackey28-Apr-06 6:22

john john mackey

28-Apr-06 6:22

Thanks! I want to stuff info into these fields that I would otherwise have to extract in the "data" files I create. With these props set, I can just "mouse-over" a file listing in (File) Explorer and get a quick summary.

Johnny

strange c code

xyhan27-Apr-06 11:47

xyhan

27-Apr-06 11:47