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The amount of memory required by a CMyClass object is the same, regardless of whether it's used on the stack or the heap.
Garbage collection in VC++ is non-existant. If you use the heap, use it wisely. If I have a given object new'd/deleted many times, I will usually redesign the app so that the class is defined as a global variable and new'd in InitInstance, and deleted in the app destructor. Of course, this assumes that you don't need more than a single instance of the class object.
Each app's requirements are different.
Last item of note - I'm not sure if there's a limit on the size of the stack in a 32-bit program. In 16-bit days, it was 64k, so you had to be very careful of what data you put there.
------- signature starts
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
Please review the Legal Disclaimer in my bio.
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John Simmons / outlaw programmer wrote:
Last item of note - I'm not sure if there's a limit on the size of the stack in a 32-bit program.
There is no limit here, except when the virtual memory for stack bottom reaches something else (such as a heap). Then it will surely go down in flames. 
It can AFAIK be changed by e.g. linker flags (changing the PE flags), but to my knowledge it has never been used in production applications.
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Ola Carlsson wrote:
Does it matter if I use semantic
[...]
Yes. If you're using heap memory your app will have larger memory footprint.
There are a number of ways you can reduce the memory size of your executable, but they always boils down to: know what you're doing and what your compiler and runtime library is doing for you.
Do Windows use some kind of garbage collection?
Absolutely not. That's your responsibility.
Then my app has been running for a while the memory usage is lesser. Why?
There could be a number of reasons. One of them could be that you just looked at what was currently committed to RAM and not the total Working Set. When you minimize any app its working set is "trimmed" (SetProcessWorkingSetsize(-1, -1); IIRC).
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I need to read the serial port, but I cannot read it.
I had configure the DCB structure with baud rate of 9600, NOPARITY, 1 Stop bit, and 8 bits of ByteSize.
I can write to the port, I'm using the function WriteFile, and it works fine.
But when I attempt to read the serial port, it fails.
The code is:
ReadFile(hDevComm, chInput, 10, &dwBytesRead, NULL)
and the return value is OK and dwBytesRead 0
thanks in advance!
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There's a couple of articles here on CodeProject that explains that.
Take a look here: http://www.codeproject.com/system/
- Anders
Money talks, but all mine ever says is "Goodbye!"
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Hi! This should be a easy task for most of you, and it sounds easy, but i can't find in my SDI with MFC aplication where to use WS_MAXIMIZE, but i'm not sure if this is the appropriate procedure because WS_MAXIMIZE is related to a window not an aplication, can you help me?
Thank you
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Thank you Nishant S, but what i see now is that the Frame maximizes but it quickly returns to its normal (not maximized) state, i tracked the int nCmdShow argument and i noticed that its value keep being 3 until it reaches a CFrameWnd function :
void CFrameWnd::InitialUpdateFrame(CDocument* pDoc, BOOL bMakeVisible)
inside this function, nCmdShow, returns to its 'default' value 1, why does this happends?
Thanks
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I created a new SDI app using VC++ 6 and added the code I had shown. And the app started maximized and without a flicker as well. If it returns to a normal state for you, you must have over ridden some other functions as well.
Do this :-
(1) Create a fresh SDI app
(2) Use the code I had shown in the first post
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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Well, i did it, and it worked, i don't know why it doesn't in my application, what do you think is most probable to be happening? What else can i look for to find where am i iver ridden other functions, i keep on debbuging but i can't find the reasin for the Frame to come back to its 'normal' state!
Thank you
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Well, i guess i found the reason, when i change windows i use:
pNewActiveView->Create(NULL, NULL, 0L, CFrameWnd::rectDefault, this, ViewID, &context);
pNewActiveView->OnInitialUpdate();
maybe its because of the CFrameWnd::rectDefault that it over rides that argument, what do you think? How can i change it to maximized, i look at its member function and variables but nothing seemed to fit with my intents!
Thanks
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Well, it was not what i expected 
I'll trying to find witch function i over ride, if there is someone who has a ideia i would appreciate very much an advise.
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Hoorah, viva!!!
I found it!! I was making
m_pMainWnd->ShowWindow(TRUE);
instead of m_pMainWnd->ShowWindow(SW_SHOW);
in my C..app file
Thank you for your time
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Is There any CListCtrl Class Support the Printing ..???
i wanna the Report view..Look like The Seagate Crystal Report.
Renjith-The CPian.
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I don't think so, I think you need to draw the control into your CPrintDC.
Christian
I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002
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Renjith, see this article.
/ravi
Let's put "civil" back into "civilization"
http://www.ravib.com
ravib@ravib.com
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That was blasphemous
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Does anyone know how to get the outline for a bitmap?
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do you mean something more complicated than drawing a rectangle?
-c
Garbage collection, making life better - for weenies!
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Hi again,
IE has a field of standard buttons. Is it possible to add a button to that field and attach some code to it to be invoked when the button is pushed?
Thx a lot,
/Tommy
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Hi everybody,
I wish to perform some action on a piece of selected text, grabbed from within IE. So, when for example double clicking a word in explorer, the word gets selected. Immediately I would like my code to execute to perform some nifty action. Does anyone know how to accomplish this, any pointers?
Seems like a difficult task, but is it really?
/Tommy
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hi .. i want to write a bitmap to a file , the code which ive written is
BOOL COpenbitmapDlg::WriteDIB(LPTSTR szFile, HANDLE hDIB)
{
//----------------------------------------
BITMAPFILEHEADER hdr ;
LPBITMAPINFOHEADER lpbi ;
if(!hDIB)
return FALSE ;
CFile file ;
if(!file.Open(szFile,CFile::modeWrite|CFile::modeCreate))
return FALSE ;
lpbi=(LPBITMAPINFOHEADER)hDIB;
int nColors = 1 << lpbi->biBitCount;
hdr.bfType = ((WORD) ('M' << 8) | 'B'); // is always "BM"
hdr.bfSize = GlobalSize (hDIB) + sizeof( hdr );
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
hdr.bfOffBits = (DWORD) (sizeof( hdr ) + lpbi->biSize +
nColors * sizeof(RGBQUAD));
file.Write( &hdr, sizeof(hdr) );
// Write the DIB header and the bits
file.Write( lpbi, GlobalSize(hDIB) );
//file.WriteHuge(lpbi,GlobalSize(hDIB)):
return TRUE;
}
and then i pass it a bitmap handle which i use to open simple bitmap files.
this code do create a file .. but when i try to check dat file i get an error message , secondly the file size is also very much less than the orignal file.
looking for ure hlp
looking forward from all the gurus of code
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try:
BYTE* pDib = (BYTE*)GlobalLock(hDIB);
replace hDIB with pDib and call GlobalUnlock(pDib); at the end.
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what the hell...u agian.since 1981 u r asking the same question.
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My problem is that I can not compare the character 13 which is carriage return and the character 10 newLine. I attemp to do f.e
char buffer[10];
if ((buffer[ct]==\13)||(buffer[ct]==\10))
too I have attempt:
if ((buffer[ct]==0x0D)||(buffer[ct]==0x0A))
also
if ((buffer[ct]==char(13))||(buffer[ct]==char(10))
but any other way it works fine. I don´t know why it is the cause. The program entry not for this way.
thanks in advance.
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