Re: vsprintf and string. - C / C++ / MFC Discussion Boards

Re: How to add help files into .EXE file

S Douglas9-Dec-06 1:33

S Douglas

9-Dec-06 1:33

Max++ wrote:
want to link txt files(help file)

Out of curiosity, why not use HTMLHelp? It actually makes it easier to maintain.

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

What am I doing wrong?

MyFathersSon6-Dec-06 3:30

MyFathersSon

6-Dec-06 3:30

I've used MFC to create a custom control: An Ellipse with an edit control inside, so it appears as a circular edit box. Problem is, I can't get the data out from the edit control whenever I type anything in. I'm using the windows message handler WM_CHAR, but I fear that that message handler is only interested in the rectangle and not the edit control. How do I get access to the edit control's data?
Thanks

Re: What am I doing wrong?

Mark Salsbery6-Dec-06 6:26

Mark Salsbery

6-Dec-06 6:26

MyFathersSon wrote:
Problem is, I can't get the data out from the edit control whenever I type anything in

Maybe these will help?

Three ways to get text from an edit control:
CEdit::GetWindowText()
EM_GETLINE message to edit control
WM_GETTEXT message to edit control

Re: What am I doing wrong?

MyFathersSon6-Dec-06 8:47

MyFathersSon

6-Dec-06 8:47

Cheers Mark, Unfortunately I feel that the code might be causing problems. I code the control as follows:

void CEditableCircleCtrl::DrawControl()//called by OnDraw method
{
CDC *pDC = GetDC();
if(pDC == NULL)
{
return;
}
CRect circlerect;
//draw the round rectangle
circlerect.top = 0;
circlerect.left = 0;
circlerect.bottom = 40;
circlerect.right = 40;
pDC->Ellipse(circlerect);
}

...
int CEditableCircleCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (COleControl::OnCreate(lpCreateStruct) == -1)
return -1;
//create the edit box
editrect.top = 13;
editrect.left = 6;
editrect.bottom = 28;
editrect.right = 36;
editctrl.Create(WS_VISIBLE|WS_CHILD|ES_CENTER,editrect, this, 0);
return 0;
}

How can I get hold of the text? Am I doing something wrong? WM_CHAR doesn't capture any text entered in the control. Where would I place any of your suggestions?

Re: What am I doing wrong?

Mark Salsbery6-Dec-06 9:16

Mark Salsbery

6-Dec-06 9:16

WM_CHAR would be sent to your editctrl object (which I assume is a CEdit(?)) so you'd need to
override CEdit and in your derived class handle WM_CHAR. That's if you really need to intercept
every char as it is entered by the user.

Anytime you want to extract the text from the edit control (after it is created, of course) you
can use something like

// Copy contents of edit control to a character array...
TCHAR szBuffer = new TCHAR[editctrl.GetWindowTextLength() + 1];
editctrl.GetWindowText(szBuffer, GetWindowTextLength() + 1);

// Copy contents of edit control to a CString...
CString str;
editctrl.GetWindowText(str);

Re: What am I doing wrong?

MyFathersSon8-Dec-06 5:44

MyFathersSon

8-Dec-06 5:44

Cheers Mark, that was very helpful. Thanks for your time

vsprintf and string.

vikramlinux6-Dec-06 2:18

vikramlinux

6-Dec-06 2:18

Hie,

I have one function

void Log(const string& format="", ...)
{
va_list args;
va_start(args,format);
int len= vsprintf(buffer, format, args);
va_end(args);
cout<

Re: vsprintf and string.

Nibu babu thomas6-Dec-06 2:27

Nibu babu thomas

6-Dec-06 2:27

vikrams wrote:
vsprintf(buffer, format, args);

Maybe you are passing a invalid format string. If it's not a valid format string then the behavior is undefined.

Maybe you can modify the above function to look like this...

void __cdecl Log( const char* lpszString, ... )
{
   va_list args;
   va_start(args, lpszString );
   
   int len = vsprintf(buffer, lpszString, args ); // lpszString should be a valid format string.
   va_end(args);
}// End Log

And what is this buffer variable??

Nibu thomas
A Developer

Programming tips[^] My site[^]

Re: vsprintf and string.

vikramlinux6-Dec-06 2:36

vikramlinux

6-Dec-06 2:36

I tried using format.c_str().
but it's crashing.

use PRE tags

toxcct6-Dec-06 2:32

toxcct

6-Dec-06 2:32

please Vikrams Suspicious | :suss:

you start to know CP well enough nowadays to know that you should post code samples within <pre></pre> html tags...
see my sig for a relevant link

Don't know where to start ?
Refer the Forums Guidelines and ask a friend

[VisualCalc 3.0][Flags Beginner's Guide]

Re: vsprintf and string.

prasad_som6-Dec-06 2:36

prasad_som

6-Dec-06 2:36

To add to Nibu, uninitialized buffer could be causing crash.
Can you show , how it is declared ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: vsprintf and string.

vikramlinux6-Dec-06 2:39

vikramlinux

6-Dec-06 2:39

void Log(const string& format="", ...)
{
 char buffer[1024]="";
 va_list args;
 va_start(args,format);
 int len= vsprintf(buffer, format.c_str(), args);
 va_end(args);
 cout<<buffer; 
}

This is not working !

Re: vsprintf and string.

prasad_som6-Dec-06 2:47

prasad_som

6-Dec-06 2:47

This code runs without any crash.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: vsprintf and string.

Zac Howland6-Dec-06 3:29

Zac Howland

6-Dec-06 3:29

vikrams wrote:
This is not working !

With what input?

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: vsprintf and string.

David Crow6-Dec-06 5:27

David Crow

6-Dec-06 5:27

vikrams wrote:
This is not working !

When using a string type, va_start() adds 16 bytes to the starting address of format to get to the first optional argument. However, when using format.c_str() with vsprintf(), you are not 16 bytes from the start of format.

Try this instead:

void Log(const char *format, ...)
{ 
    char buffer[1024] = ""; 
    va_list args; 
    va_start(args, format); 
    int len= vsprintf(buffer, format, args); 
    va_end(args); 
    cout<<buffer<<endl; 
}
...
Log(fmt.c_str(), "Hello World");

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: vsprintf and string.

Stephen Hewitt6-Dec-06 15:17

Stephen Hewitt

6-Dec-06 15:17

I'd use the Boost.Format[^] library to do this kind of thing.

Steve

C3861 _L identifier not found

uday kiran janaswamy6-Dec-06 2:01

uday kiran janaswamy

6-Dec-06 2:01

I am programming with strings and i got this error when i am trying to upgrade my code from VC6.0 to VC7.1 . Its very urgent can anybody help me please.

regards,
venkat.

Uday kiran

Re: C3861 _L identifier not found

prasad_som6-Dec-06 2:14

prasad_som

6-Dec-06 2:14

Code ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: C3861 _L identifier not found

Cedric Moonen6-Dec-06 2:16

Cedric Moonen

6-Dec-06 2:16

Which identifier is not found ? Your post is lacking of relevant information.
Identifier not found probably means that you forgot to include a header file.

Cédric Moonen
Software developer

Charting control [v1.1]

Re: C3861 _L identifier not found

Nibu babu thomas6-Dec-06 2:18

Nibu babu thomas

6-Dec-06 2:18

uday kiran janaswamy wrote:
I am programming with strings

I think it's not _L but _T.

Nibu thomas
A Developer

Programming tips[^] My site[^]

Thread exit handler

harsha_12346-Dec-06 1:59

harsha_1234

6-Dec-06 1:59

Hi all,
do we have some way by which we can have a function
with which we can do the cleanup job!!
like exit handler for threads.
i have created thread with CreateThread

Thanks
Harshal

Re: Thread exit handler

Mark Salsbery6-Dec-06 6:30

Mark Salsbery

6-Dec-06 6:30

You can call any function you have access to from your thread.
Write a cleanup function and call it?

Are you thinking along the lines of InitInstance/ExitInstance virtual initialization/cleanup
methods?

can we have a toolbar on dialog

cancerion6-Dec-06 1:42

cancerion

6-Dec-06 1:42

hello

can we have a toolbar on dialog ???

Re: can we have a toolbar on dialog

toxcct6-Dec-06 1:46

toxcct

6-Dec-06 1:46

have you had a look here[^] ?

Don't know where to start ?
Refer the Forums Guidelines and ask a friend

[VisualCalc 3.0][Flags Beginner's Guide]

Re: can we have a toolbar on dialog

Nibu babu thomas6-Dec-06 2:20

Nibu babu thomas

6-Dec-06 2:20

cancerion wrote:
can we have a toolbar on dialog ???

Take a look at CWnd::RepositionBars. MSDN has a nice sample on this too.

For the sample you will have to search MSDN with the keyword as RepositionBars.

Nibu thomas
A Developer

Programming tips[^] My site[^]

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