Re: Extracting the user input from Edit Box - C / C++ / MFC Discussion Boards

NiceNaidu19-May-06 2:01

19-May-06 2:01

Hi Guys,

This is a question asked by one of my junior.
Though i could able 2 answer him,by telling him to ensure different memory location for each instance of the class,the size is set as 1.

But I am(ofcourse he tooo) not convinced with my answer.

Can anyone of u give me a good explanation for this Question??

Appu..
"If you judge people, you have no time to love them."

Re: Why the Size of an Empty Class is 1 ??

Laxman Auti19-May-06 2:07

Laxman Auti

19-May-06 2:07

When you create the object of the class then the for the existence of the object there should be atleast memory so it is is 1 byte even the class dont having single variable

and if the class contains atleast one virtual function then size is 2 bytes

Knock out 't' from can't,
You can if you think you can
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Re: Why the Size of an Empty Class is 1 ??

NiceNaidu19-May-06 2:14

NiceNaidu

19-May-06 2:14

A_Laxmanif the class contains atleast one virtual function then size is 2 bytes

r u sure about it ??

If it contains a virtual function ,then its size should be either 4(since the memory location will be 4 bytes long) or 5(4+1) bytes ..How can it be 2 bytes.

I am confused.

Appu..
"If you judge people, you have no time to love them."

Re: Why the Size of an Empty Class is 1 ??

Laxman Auti19-May-06 2:22

Laxman Auti

19-May-06 2:22

NiceNaidu wrote:
I am confused.

don't be confused.

In case of 16 bit applications(DOS)
the size of class when virtual function present is 2 bytes

In case of 32 bit application(Windows)
the size of class when virtual function present is 4 bytes

In case of empty class for both cases it is 1 byte

Knock out 't' from can't,
You can if you think you can
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-- modified at 8:24 Friday 19th May, 2006

Re: Why the Size of an Empty Class is 1 ??

David Crow19-May-06 3:07

David Crow

19-May-06 3:07

NiceNaidu wrote:
...to ensure different memory location for each instance of the class...

This is the answer. What else are you looking for? Confused | :confused:

FAQ[^]

"The largest fire starts but with the smallest spark." - David Crow

Extracting the user input from Edit Box

VinayCool19-May-06 2:00

VinayCool

19-May-06 2:00

Hi,

I have a dialog window in which user has to enter some text in the IDC_WORD after clicking on search button i want the value to be stored in a variable line,

I have created a variable m_WORD of CString type ,

CString line;
line = m_WORD;
char * w =(char *) (LPCTSTR) line;
word = w;

but the value is not getting stored in line I used F5 and checked value of m_WORD is empty "" what will be cause ..?? can anyone help me with this….

Regards,
Vinay Charan.

Re: Extracting the user input from Edit Box

NiceNaidu19-May-06 2:08

NiceNaidu

19-May-06 2:08

Use UpdateData(TRUE) before line = m_WORD

Appu..
"If you judge people, you have no time to love them."

Re: Extracting the user input from Edit Box

Laxman Auti19-May-06 2:35

Laxman Auti

19-May-06 2:35

vinaycool wrote:
CString line;
line = m_WORD;
char * w =(char *) (LPCTSTR) line;

char * str=new char[MAX];
UpdateData();
lstrcpy(str,m_test.GetBuffer(m_test.GetLength()));

The code copies the data from the edit box into the str variable.

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: Extracting the user input from Edit Box

ThatsAlok19-May-06 2:45

ThatsAlok

19-May-06 2:45

A_Laxman wrote:
vinaycool wrote: CString line;line = m_WORD;char * w =(char *) (LPCTSTR) line;

nope this code will also work well, have a try!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: Extracting the user input from Edit Box

Laxman Auti19-May-06 2:51

Laxman Auti

19-May-06 2:51

ThatsAlok wrote:
nope this code will also work well, have a try!

Yes buddy,
I have tried the code and works fine.
as well tried another to do same and posted in my previous post.;P

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: Extracting the user input from Edit Box

ThatsAlok19-May-06 2:41

ThatsAlok

19-May-06 2:41

vinaycool wrote:
I have created a variable m_WORD of CString type ,

Have you called GetWindowText in that Function or UpdateData(FALSE) !

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: Extracting the user input from Edit Box

David Crow19-May-06 3:09

David Crow

19-May-06 3:09

Use:

GetDlgItem(IDC_WORD)->GetWindowText(m_WORD);

"The largest fire starts but with the smallest spark." - David Crow

Re: Extracting the user input from Edit Box

Hamid_RT19-May-06 19:10

Hamid_RT

19-May-06 19:10

use UpDateData then

m_youret.GetWindowText( m_WORD);

whitesky

Re: Extracting the user input from Edit Box

rbid19-May-06 21:08

rbid

19-May-06 21:08

There is another way to do it Smile | :)

Assign a "Control" variable to your edit box (CEdit m_textEdit).
Use the method GetWindowText() for retrieving the results

void CDemo::OnBnClickedSearchButton()
{
    ...
    CString userResponseText;
    m_textEdit.GetWindowText(userResponseText);

    // userResponseText now contains user response..
    ...
}

Here you don't need to worry about UpdateData that usually has side effects.

Just wanted to give you another way to do it.

-- Ricky Marek (AKA: rbid)
-- "Things are only impossible until they are not" --- Jean-Luc Picard

My articles

.ncb and .pch file

big_denny_20019-May-06 1:54

big_denny_200

19-May-06 1:54

Hi all

I have a project, created in VS2005.

When I enter its directory, inside I have 2 files and 3 folders : Debug, MyProject, Release, MyProject.ncb, MyProject.sln

Strange is that MyProject.ncb is 16 MB in size.
And other files(folders), together are only 4 MB(If I clear the debug and release folders).

Strange is also that MyProject.pch file is 12MB, when Debug folders of my project is not empty.

Why are these files so large ?

Size of total source files I use is only 3MB.

Thank you.

Re: .ncb and .pch file

Sebastian Schneider19-May-06 2:08

Sebastian Schneider

19-May-06 2:08

NCB is the Intellisense Database. This sometimes messes up BADLY. I have had a NCB-File with a size of 1.2 GB (!!!). Sometimes the Parser will get a hick-up and go crazy. Just delete the file, it's automatically recreated when you reload your project. Looking stuff up (code completion etc.) might be a bit slow, but will soon get back to its old self.

The PCH-File is the precompiled header file. You can delete that one as well, it also will be recreated. If it is not there, compiling might take a bit longer (because it has to be recreated).

If you do not need recompiled headers, turn them off in the project properties.

Cheers,
Sebastian

--
Contra vim mortem non est medicamen in hortem.

Use Strlog in the application

vemula_vijay19-May-06 1:53

vemula_vijay

19-May-06 1:53

Hello everyone,

i am working in c++.
is it possible to use strlog.h in win32 console application.
if so where can i find the file and the documentation for using it.

thanks in advance,

regs
vijay

Re: Use Strlog in the application

Laxman Auti19-May-06 2:02

Laxman Auti

19-May-06 2:02

vemula_vijay wrote:
where can i find the file

In vs6.0 the file is not found and
you can get the file from the following links
http://www.koders.com/c/fid08988FEB1599197A286D0BB669376700B6051560.aspx[^]
http://www.koders.com/cpp/fid604EACFF7220C14074F04C2E10B75B5C3CBA5B96.aspx[^]

Knock out 't' from can't,
You can if you think you can
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Data Screen

kk.tvm19-May-06 1:44

kk.tvm

19-May-06 1:44

Hi
Is any tabulor data entry control is available VC?

Thanx in advance

KK

Re: Data Screen

Laxman Auti19-May-06 1:47

Laxman Auti

19-May-06 1:47

kk.in wrote:
Is any tabulor data entry control is available VC?

Are you talking about the control which looks same as Grid Controls in VB?

if so then there is CListCtrl class which provides such tabular information sroring

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You can if you think you can
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-- modified at 7:53 Friday 19th May, 2006

Re: Data Screen

kk.tvm19-May-06 1:52

kk.tvm

19-May-06 1:52

Hi Laxman

Yes

KK

Re: Data Screen

Laxman Auti19-May-06 2:58

Laxman Auti

19-May-06 2:58

Ok,
Then you may use the CListCtrl by setting the style property to report
and after that insert the columns programatically
Smile | :)

wrote:

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: Data Screen

ThatsAlok19-May-06 2:10

ThatsAlok

19-May-06 2:10

kk.in wrote:
s any tabulor data entry control is available VC?

TRY FlexGrid

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Difference between Release , Release Unicode , Unicode Static Release

zahid_ash19-May-06 1:17

zahid_ash

19-May-06 1:17

Hi,

What is the diference between following configuration modes

Release , Release Unicode , Unicode Static Release .

When these are used?

Regards.

Re: Difference between Release , Release Unicode , Unicode Static Release

Hamid_RT19-May-06 1:32

Hamid_RT

19-May-06 1:32

See Learn about the issues and differences between Debug and Release builds[^]

whitesky

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