C / C++ / MFC

Thilek1-Feb-09 22:26

Thilek

1-Feb-09 22:26

but how to call the sub form.. i having problem with calling the sub form.

Thank you.

Iain Clarke, Warrior Programmer1-Feb-09 22:53

1-Feb-09 22:53

Have look at the following discussion from a few days ago:
http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=2898321[^]
The actual question took a little decoding, but hopefully the answers will help you a bit!

They're based on MFC's CDialog, but hopefully the approach will help you.

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Thilek2-Feb-09 0:01

Thilek

2-Feb-09 0:01

i am facing a new problem now...

void Spartamenu::OnBnClickedCancel()
{
// TODO: Add your control notification handler code here
//OnCancel();
}

even after i disable the onCancel and run it. when i click on the button its still closing the application.

________________________________________________________________________

void Spartamenu::OnBnClickedButton1()
{
// TODO: Add your control notification handler code here
CDialog::SetTimer(IDD_AUTO,1,NULL);

}

for open a subform i use this command but when i click on it nuthing happen...

i am so confused.. kidly help me plz ya..

Frown | :(

Iain Clarke, Warrior Programmer2-Feb-09 0:45

2-Feb-09 0:45

OnCancel and OnOK are slightly special - other commands need to be in the message map, but not for IDOK / IDCANCEL.

If you look in the documentation for CDialog::OnCancel, you'll see that it is a virtual method.

So, override OnCancel, and make it do nothing.

ie:

void SpartaMenu::OnCancel ()
{
}

I do this for my modeless dialogs - in fact I have an overriden base class for them all (CModelessDialog) that does this, so I don't have to remember each time.

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

Thilek2-Feb-09 1:12

Thilek

2-Feb-09 1:12

ok.. so hows i should call the other form..

Below is the coding for the first form and second form.. i need to call the form 2 from this form when i click Button1. help me plz...
______________________________________________________________________
Form 1

// Spartamenu.cpp : implementation file
//

#include "stdafx.h"
#include "Sparta.h"
#include "Spartamenu.h"

IMPLEMENT_DYNAMIC(Spartamenu, CDialog)

Spartamenu::Spartamenu(CWnd* pParent /*=NULL*/)
: CDialog(Spartamenu::IDD, pParent)
{

}

Spartamenu::~Spartamenu()
{
}

void Spartamenu::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(Spartamenu, CDialog)

ON_BN_CLICKED(IDCANCEL, &Spartamenu::OnBnClickedCancel)
ON_BN_CLICKED(IDC_BUTTON1, &Spartamenu::OnBnClickedButton1)
END_MESSAGE_MAP()

void Spartamenu::OnBnClickedCancel()
{
// TODO: Add your control notification handler code here
OnCancel();
}

void Spartamenu::OnBnClickedButton1()
{
// TODO: Add your control notification handler code here
CDialog::SetTimer(IDD_AUTO,1,NULL);
DestroyWindow();
}
____________________________________________________________________

Form2

// Auto.cpp : implementation file
//

#include "stdafx.h"
#include "Sparta.h"
#include "Auto.h"

// Auto dialog

IMPLEMENT_DYNAMIC(Auto, CDialog)

Auto::Auto(CWnd* pParent /*=NULL*/)
: CDialog(Auto::IDD, pParent)
{

}

Auto::~Auto()
{
}

void Auto::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(Auto, CDialog)
ON_BN_CLICKED(IDCANCEL, &Auto::OnBnClickedCancel)
ON_BN_CLICKED(IDOK, &Auto::OnBnClickedOk)
ON_LBN_SELCHANGE(IDC_LIST1, &Auto::OnLbnSelchangeList1)
END_MESSAGE_MAP()

// Auto message handlers
int Auto::DoModal()
{

}

void Auto::OnBnClickedCancel()
{
// TODO: Add your control notification handler code here
OnCancel();
}

void Auto::OnBnClickedOk()
{
// TODO: Add your control notification handler code here
OnOK();
}

void Auto::OnLbnSelchangeList1()
{
// TODO: Add your control notification handler code here
}
_____________________________________________________________________

Iain Clarke, Warrior Programmer2-Feb-09 2:02

read single line using CFile?

2-Feb-09 2:02

Please read the other Q&A session I linked you to. I gave the answer to an identical question there. And it's too long to type again.

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

sam_psycho1-Feb-09 19:38

1-Feb-09 19:38

Hi all,
How can I know the number of lines of my file, and I want to read any perticular line ?
plz gv me solution..thx Smile | :)

Chandrasekharan P1-Feb-09 19:58

Chandrasekharan P

1-Feb-09 19:58

There is no specific API for getting the number of lines in a file. you need to write your own code for that.

And what do u mean by saying "read a perticular line"?

sam_psycho1-Feb-09 20:07

1-Feb-09 20:07

ok...I meant, I want to read only 10 and 12 number lines from the file.

Nishad S1-Feb-09 20:16

Nishad S

1-Feb-09 20:16

CStdioFile will be better to use... with that you can read line by line.

- ns ami -

CPallini1-Feb-09 21:34

CPallini

1-Feb-09 21:34

As already suggested by ns ami, CStdioFile is a better choice, since it provides the ReadString [^] method (to read the file line by line).
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]

sam_psycho1-Feb-09 21:40

1-Feb-09 21:40

By using CStdioFile prob is solved....thnx a lot Smile | :)

sam_psycho1-Feb-09 23:02

1-Feb-09 23:02

Hi,
I want to append a line to file i tried like this:
CString strNewWord (_T(" Test line to write"));
CStdioFile file;
file.Open(strSystemPath,CFile::modeWrite|CFile::modeNoTruncate,NULL);
file.SeekToEnd();
CString strWriteData("\\n ");
strWriteData+=strNewWord;
file.WriteString(strWriteData);
file.Close();
this code appends data but in single line (assume no compile time errors):

\n Test line to write\n Test line to write\n Test line to write
I want like this:

Test line to write
Test line to write
Test line to write

Iain Clarke, Warrior Programmer1-Feb-09 23:13

1-Feb-09 23:13

Looking at the documentation[^](gasp), it says "Any newline character in lpsz is written to the file as a carriage return–linefeed pair".

I can never remember whether \n or \r is a newline character, and which is linefeed - so try either single stepping into the WriteString command and looking, or guess and try \r.

Good luck,

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

CPallini1-Feb-09 23:51

CPallini

1-Feb-09 23:51

Iain Clarke wrote:
I can never remember whether \n or \r is a newline character

On windows none of them (the sequence \r\n is newline), see, for instance http://en.wikipedia.org/wiki/Newline[^].
I suppose that 'any newline' means \r or \n or \r\n (but I didn't make a test).
Smile | :)

Iain Clarke, Warrior Programmer1-Feb-09 23:58

1-Feb-09 23:58

That's why I'd step in and get an authoriative answer! I don't trust me either.

Iain.

Codeproject MVP for C++, I can't believe it's for my lounge posts...

CPallini2-Feb-09 0:23

CPallini

2-Feb-09 0:23

Please don't trust me: from the same article:

To facilitate the creation of portable programs, programming languages provide some abstractions to deal with the different types of newline sequences used in different environments.

The C programming language provides the escape sequences '\n' (newline) and '\r' (carriage return). However, these are not required to be equivalent to the ASCII LF and CR control characters. The C standard only guarantees two things:

1. Each of these escape sequences maps to a unique implementation-defined number that can be stored in a single char value.
2. When writing a file in text mode, '\n' is transparently translated to the native newline sequence used by the system, which may be longer than one character. (Note that a C implementation is allowed not to store newline characters in files. For example, the lines of a text file could be stored as rows of a SQL table or as fixed-length records.) When reading in text mode, the native newline sequence is translated back to '\n'. In binary mode, the second mode of I/O supported by the C library, no translation is performed, and the internal representation of any escape sequence is output directly.