Memory Size - C / C++ / MFC Discussion Boards

Chris Richardson23-Apr-03 9:19

23-Apr-03 9:19

There's some things you can do with regard to "layered windows". Here's an article that deals with them a little bit, to create a transparent window, but I'm not sure if it will help:

http://www.codeproject.com/useritems/forecast.asp[^]

Chris Richardson

You can stash and you can seize
In dreams begin, responsibilities
U2 - Acrobat[^]

Stop being PC and accounting for everyone and his momma's timeframe. Just enjoy your - Rohit Sinha in the content-challenged thread

Re: I give up on GDI !

pankajdaga23-Apr-03 9:38

pankajdaga

23-Apr-03 9:38

Hi,
Thanks for your reply. I tried setting the window creation style and adding the transparent parameter to the _exStyle member..but nothing..still the gray area at the child control. Cry | :((

Thanks anyways Smile | :)

I appreciate you taking the time.

Sincerely,
Pankaj

Without struggle, there is no progress

Re: I give up on GDI !

Joel Lucsy23-Apr-03 13:27

Joel Lucsy

23-Apr-03 13:27

Someone else mentioned using layered windows. As a footnote, layered windows only work with top-level windows, not child windows.

Try overridding the WM_ERASEBKGND message and doing nothing. If this is not enough, then try sending a WM_PRINT message to the parent window which basically asks it to render itself into a HDC of your choosing. Then use the resulting image to draw your background.

Joel Lucsy

Re: I give up on GDI !

basementman24-Apr-03 7:12

basementman

24-Apr-03 7:12

When handling the OnEraseBkgnd, return a Hollow brush, rather than doing nothing.
EX:

return (HBRUSH)GetStockObject(HOLLOW_BRUSH);

How to restore previous CTreeCtrl state after app. exit

Jingmin Wei23-Apr-03 8:18

Jingmin Wei

23-Apr-03 8:18

Greeting,
I am working on a project that need to restore a CTreeCtrl to its previous state when my application starts up. The state of CTreeCtrl will be saved when application exits and restored when application starts up.

Is anyone have any ideas how this is being done?

Thanks alot,

J. Wei

Re: How to restore previous CTreeCtrl state after app. exit

brianwelsch23-Apr-03 18:46

brianwelsch

23-Apr-03 18:46

Try this article:

http://www.codeproject.com/treectrl/TBTreeStateMgr.asp[^]

BW
"I always wanted to be somebody, but now I realize I should have been more specific."
- Lily Tomlin

Thank you so much!

Jingmin Wei24-Apr-03 7:06

Jingmin Wei

24-Apr-03 7:06

Thank you so much!

J. Wei

Memory Size

emrosa23-Apr-03 7:42

emrosa

23-Apr-03 7:42

Hello...I'm declaring a class array of size 80,000,000...when compiling there is an error that the size exceeds the allowed one and the program may not run.

I tried but it really does not work..it says that the program is not a win32 application.

My solution is to declare the class array dynamically:

myclass1 = new myclass[size]

When I tried with this there is no memory allocated and the program aborts.

As myclass has some double data and other classes embedded, I guess I need to overload the operator new so to create the needed space.

Can anyone help me how to do this, assuming the class is defined as:

class myclass{
public:
myclass2 curr_data2;
myclass3 curr_data3;
myclass2 new_data4;
myclass3 new_data5;
}

and the other classes
class myclass2{
public:
double x;
double y;
double z;
}

class myclass3{
public{
double motionX;
double motionY;
double motionZ;
}

Thanks,

Eric Manuel Rosales Pena Alfaro
PhD student
Unversity of Essex
Wivenhoe Park
Colchester, CO4 3SQ
Essex, Uk
email: emrosa@essex.ac.uk
tel: +44-01206-87311

Re: Memory Size

Chris Meech23-Apr-03 8:34

Chris Meech

23-Apr-03 8:34

A quick calculation yields that for the array alone, the program will use approximately 3.6G of memory. I think you need to re-think your array size to bring it down to a much smaller number.

Chris Meech

"what makes CP different is the people and sense of community, things people will only discover if they join up and join in." Christian Graus Nov 14, 2002.

"Microsoft hasn't ever enforced its patents. Apparently they keep them for defensive reasons only. Or, they could be waiting 'til they have a critical mass of patents, enforce them all at once and win the game of Risk that they're playing with the world." Chris Sells Feb 18, 2003.

Re: Memory Size

David Crow23-Apr-03 10:28

David Crow

23-Apr-03 10:28

The default stack size is 1MB, hence the compiler error. Allocating much more than that (100s of MBs) from the heap is possible but I would still question the need. That's not to say that a need doesn't actually exist, but to just nonchalantly ask the OS for GBs, or even MBs, of memory all at once is questionable.

Re: Memory Size

Nitron23-Apr-03 14:07

Nitron

23-Apr-03 14:07

easy dude, that's pretty nuts. are you sure you NEED 80 MILLION of your class thingy's, or are you just allocating that many "to be on the safe side" ?

I suggest you look into std::vector. It just may provide all the answers you seek.

i.e., if you need another one of your classes, just do something like:

std::vector<MyClass*> vpMyClass;

for(int i=0; i<iSomeNumberOfNeededClasses; i++)
   vpMyClass.push_back(new CMyClass);

just remember to delete everything and empty the vector when you're done.

- Nitron

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

MFC support for applications

Antti Keskinen23-Apr-03 7:25

Antti Keskinen

23-Apr-03 7:25

Hmm..

Has anyone written an add-in wizard for Visual C++ 6.0 Enterprise, which allows you to generate blank MFC projects ?

The same in english: I want to create MFC projects from scratch, but I cannot do this, as the ClassWizard is not available by default. How can I activate ClassWizard for a project that does not have anything in it ?

I already know that I can add MFC-support to a Win32-project (EXE/DLL) by choosing it from the project settings. However, for some strange reason, this doesn't always work. What I want to do, is to be able to write an MFC-application from scratch using the ClassWizard..

-Celorfie

Re: MFC support for applications

Nitron23-Apr-03 14:08

Nitron

23-Apr-03 14:08

um... my version of VC++ has an "MFC Appwizard" Unsure | :~

- Nitron

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

Limiting the number of instances

CDRom23-Apr-03 7:02

CDRom

23-Apr-03 7:02

I have a program which is installed on a Windows 2000 server which has Terminal Services installed. The question is: How can I limit the number of instances of the program opened by all users. (eg. 4 concurrent users can use the program at the same time)

Your soonest help is appreciated...

~~~~~~~~~~~~~~~
Roll eyes | :rolleyes:

CDRom

Re: Limiting the number of instances

David Crow23-Apr-03 7:40

David Crow

23-Apr-03 7:40

Read here:

http://www.flounder.com/nomultiples.htm

Basic printing

act_x23-Apr-03 6:28

act_x

23-Apr-03 6:28

I have a float value which is say 1.21000 and I want to print it as 1.21 only . I am using CString Format function to make it printable

like
float x;
..
..
CString myData;
myData.Format("%f",x);

How do I get to print 1.21 instead of 1.21000 . Please help .

Re: Basic printing

Rickard Andersson²⁰23-Apr-03 6:43

Rickard Andersson²⁰

23-Apr-03 6:43

act_x wrote:
myData.Format("%f",x);

Change to:

myData.Format("%.2f",x);

Rickard Andersson⁸
Here is my card, contact me later!
UIN: 50302279
E-Mail: nikado@pc.nu
Interests: C++, ADO, SQL, Winsock, 0s and 1s

CListCtrl

schoni23-Apr-03 6:20

schoni

23-Apr-03 6:20

Hallo!!

I want to select items in a ListCtrl not by the user , i want select the whole items in row in Report style by the programm. Not the user should select the row,
the programm must do this. There are Columnes, and the whole row must be selected.

The second problem is thsize of the items, there are only
labels (text) in the control, no imiges.
How can I change the size of the items/text ??

Thank You for helping me,

Dirk from Germany

Re: CListCtrl

Rickard Andersson²⁰23-Apr-03 6:39

Rickard Andersson²⁰

23-Apr-03 6:39

schoni wrote:
I want to select items in a ListCtrl not by the user , i want select the whole items in row in Report style by the programm. Not the user should select the row,
the programm must do this. There are Columnes, and the whole row must be selected.

SetSelectionMark(...)
I'm not sure if it's the right method

schoni wrote:
The second problem is thsize of the items, there are only
labels (text) in the control, no imiges.
How can I change the size of the items/text ??

Ownerdraw!

Rickard Andersson⁸
Here is my card, contact me later!
UIN: 50302279
E-Mail: nikado@pc.nu
Interests: C++, ADO, SQL, Winsock, 0s and 1s

Re: CListCtrl

David Crow23-Apr-03 8:04

David Crow

23-Apr-03 8:04

Something like:

CListCtrl       &ctrlList = GetListCtrl();
BOOL x;
for (int nItem = 0; nItem < 10; nItem += 2)
{
    x = ctrlList.SetItemState(nItem, LVIS_SELECTED, LVIS_SELECTED);
    TRACE("x = %d\n", x);
}

Re: CListCtrl

Nitron23-Apr-03 14:16

Nitron

23-Apr-03 14:16

Make sure you set LVS_FULLROWSELECT (or something like that) also to select the whole row.

- Nitron

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

Re: CListCtrl

Joan M23-Apr-03 21:47

Joan M

23-Apr-03 21:47

To change the height of the rows (if you meant that) you can do a trick if you don't want to ownerdraw everything:

you can create a imagelist without images and defining a special height, once this is done you have only to attach that imagelist to the listctrl and that's all.

Hope this helps.

How to hide or delete scrollbars in formview

gmlnd23-Apr-03 5:55

gmlnd

23-Apr-03 5:55

I have a FormView project. With the default, it has scrollbars and the user is able to adjust the size of the frames. I'm trying to get rid of the scrollbars. Is this possible?

Modify a record content into an AdoRecordset

Anonymous23-Apr-03 5:00

Anonymous

23-Apr-03 5:00

I need to edit (modify) a record being part of an AdoRecordset.
I've written the following code:

m_MyRecordset.Open("TABLE", CADORecordset::OPEN_TABLE);
m_MyRecordset.MoveFirst();
m_MyRecordset.Edit();
m_MyRecordset.SetFieldValue(_T("Field"), 1000);
m_MyRecordset.Update();

But it doesn't works. It generates an exception that says
that "query is too complex" !!!

Can someone tell me why it doesn't work and what
have I to do in order to edit an existing record ?

Thanks a lot!!!

Re: Modify a record content into an AdoRecordset

Toni7823-Apr-03 9:51

Toni78

23-Apr-03 9:51

Just a question. In m_MyRecordset.Open( "TABLE", CADORecordset::OPEN_TABLE) shouldn't you have have "SELECT something FROM table"? I have never used CADORecordset because I use ADO directly, that's why I am asking you this question. Or at least, have you made sure that you have opened the database and that you have a valid connection to it?

// Afterall I realized that even my comment lines have bugs

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.