C / C++ / MFC Discussion Boards

What is wrong with this class - C2248 error

charlieg7-Jul-06 3:24

7-Jul-06 3:24

I have two very simple classes as shown below. In my application code, I want to test the
condition of the object - is it valid? But, VC++ tells me :
"error C2248: 'IsValid' : cannot access public member declared in class 'CBaseFile'"

Why? Why? For goodness' sake, why? Is it not declared public? It looks like it, it even tells
me it is public. What obvious goof don't I see?

{
// app code snippet:
CSpecialFile *pSpecialFile = new CSpecialFile("a filename");

if (!pSpecialFile->IsValid()) AfxMessageBox("Oh no!!! Mr. Bill...");
}

class CBaseFile
{
public:
CBaseFile(CString sFilename);
virtual ~CBaseFile();
bool IsValid();

private:
bool m_bIsValid; // true if no problems encountered;
};

Then I inherit from it...

class CSpecialFile: CBaseFile
{
public:
CSpecialFile(CString sFilename);
virtual ~CSpecialFile();

// more methods specific to special file object go here....
};

Charlie Gilley
Will program for food...
Whoever said children were cheaper by the dozen... lied.

My son's PDA is an M249 SAW.

Re: What is wrong with this class - C2248 error

Taka Muraoka7-Jul-06 3:29

Taka Muraoka

7-Jul-06 3:29

You need this:

class CSpecialFile: public CBaseFile

0 bottles of beer on the wall, 0 bottles of beer, you take 1 down, pass it around, 4294967295 bottles of beer on the wall.

Awasu 2.2.2 [^]: A free RSS/Atom feed reader with support for Code Project.

Re: What is wrong with this class - C2248 error

charlieg7-Jul-06 3:39

charlieg

7-Jul-06 3:39

doh! insert sound of hand slapping forehead! Blush | :O

btw, love your sig...

Charlie Gilley
Will program for food...
Whoever said children were cheaper by the dozen... lied.

My son's PDA is an M249 SAW.

Re: What is wrong with this class - C2248 error

C^hris L^osinger7-Jul-06 3:32

C^hris L^osinger

7-Jul-06 3:32

class CSpecialFile: public CBaseFile

Cleek | Image Toolkits | Thumbnail maker

using C in VC express

giddy_guitarist7-Jul-06 3:23

giddy_guitarist

7-Jul-06 3:23

Hie,
i just downloaded VC 2005 express.I opened an old VC 6 project that was written in the C language.When i tried building this in VC 2005 EXPRESS.. it gives me a whole Plethora of errors Cry | :((

.Is the C language no more supported by VC express.Also i installed Microsoft Visual Studio .NET 2003.here VC supports the c language BUT does'nt support XP style.Where as VC 2005 express has a really good XP look .. i mean even the menus have a blue gradient on them.My problem is i NEED TO HAVE A VERSION THAT SUPPORTS XP STYLE AND THE C PROGRAMMING LANGUAGE.i only know C.Also i would really appreciate it if someone pointed me to a good
e-book on using VC with C++ NO MFC! .. i gonna start C++ soon!;P

Re: using C in VC express

C^hris L^osinger7-Jul-06 3:27

C^hris L^osinger

7-Jul-06 3:27

giddy_guitarist wrote:
it gives me a whole Plethora of errors

what errors ???

Cleek | Image Toolkits | Thumbnail maker

Re: using C in VC express

Zac Howland7-Jul-06 3:52

Zac Howland

7-Jul-06 3:52

Many of the old C APIs have been deprecated. I imagine that is the majority of your errors/warnings. You can turn that off using a compiler switch (you'll have to look that up as I don't have VS available at the moment).

These aren't e-books, but they are perhaps the best books you'll find for Win32 programming without MFC:

Programming Windows by Charles Petzold

Programming Applications for Microsoft Windows by Jeffrey Richter

Note: get the older editions as the newer ones have been written with C# (which was a mistake IMHO).

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: using C in VC express

giddy_guitarist31-Mar-07 5:23

giddy_guitarist

31-Mar-07 5:23

Zac Howland wrote:
Many of the old C APIs have been deprecated. I imagine that is the majority of your errors/warnings. You can turn that off using a compiler switch (you'll have to look that up as I don't have VS available at the moment).

Hi , its been a while. Yea , i got petzolds book and other books too and learnt C# , and its awesome!! Way better than win32 , i can build more powerful apps way faster! Without losing my head! (thats for anyone else doing win32)

About my problem , it seems the vc express does'nt come with the PSDK.

Look at this[^]

Hope that helped someone.

Gideon

Static method, non-static variable

Daniel Kanev7-Jul-06 2:45

Daniel Kanev

7-Jul-06 2:45

Is there any way to trick the C++ compiler and get the value of a non-static member variable from a static method.

e.g.

class CDummy
{
public:
int m_myInt;
static void dummy();
};
void CDummy::dummy()
{
int x = m_myInt; ????
}

Thanks!

modified 9-Mar-17 17:16pm.

Re: Static method, non-static variable

RChin7-Jul-06 3:11

RChin

7-Jul-06 3:11

Not without passing a reference to the instance of your class.

I Dream of Absolute Zero

Re: Static method, non-static variable

Zac Howland7-Jul-06 4:01

Zac Howland

7-Jul-06 4:01

Yes ... its called make a non-static version of the method:

class CDummy
{
public:
	int m_myInt;
	static void dummy(const CDummy& dum);
	void dummy() const;
};

void CDummy::dummy(const CDummy& dum)
{
	dum.dummy();
}

void CDummy::dummy() const
{
	int x = m_myInt;
}

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

outlook

pathakr7-Jul-06 2:44

pathakr

7-Jul-06 2:44

Hi,

I have outlook configured on my machine.

I need to send data (textual) to one email contact only .

Means I will have some text ready at some time interval and every tiem I read the data the data should go as email to this address using my outlook config.

How can I achieve this.

pathak

Re: outlook

David Crow7-Jul-06 2:46

David Crow

7-Jul-06 2:46

See here and here for examples of sending e-mail.

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

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

all urls

yang__lee7-Jul-06 2:22

yang__lee

7-Jul-06 2:22

How to get all the URLs (links) on the web page?

Leya

Re: all urls

David Crow7-Jul-06 2:43

David Crow

7-Jul-06 2:43

Use the IHTMLDocument interface to retrieve the <A> elements.

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

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

Re: all urls

Hamid_RT7-Jul-06 2:55

Hamid_RT

7-Jul-06 2:55

See Here[^] maybe it is some helpful to you

whitesky

to make a phone

yogendra kaushik7-Jul-06 2:19

yogendra kaushik

7-Jul-06 2:19

i want to know,that as i insert a edit box on dialog box
and 10 buttons with number on them from 0 to 9.
now i want that when i press these 0-9 buttons
then that will be appear on edit box . I use a progress control on dialog box
and a dial button so that after entering numbers press dial and progress button start
moving
I want as in phone system when we press buttons they appear on screen
and when dial button is pressed phone dials.

Please mail me

Re: to make a phone

Amit Agarrwal7-Jul-06 2:29

Amit Agarrwal

7-Jul-06 2:29

m_sPhoneNumber += "1";
setDlgItemText(IDC_EDIT_PHONE_NUMBER,m_sPhoneNumber);

put that code on button click.

sPhoneNumber is a String.

this code might help u.

Re: to make a phone

yogendra kaushik7-Jul-06 2:43

yogendra kaushik

7-Jul-06 2:43

thank you
but this code does not sotore number on edit box as it replace preivious number
i wantr as we use in mobile phone
thank s

Please mail me

Re: to make a phone

David Crow7-Jul-06 2:44

David Crow

7-Jul-06 2:44

About how many times are you going to ask this question? It's been answered several times.

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

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

Re: to make a phone [modified]

_AnsHUMAN_ 7-Jul-06 3:26

_AnsHUMAN_

7-Jul-06 3:26

Here's the code for one more time.
You can call this function whenever the key is pressed and pass an integer to the function underneath based on what button is clicked on the dialog by the user.
m_editCtrl is the control variable for the edit box

In the header file declare the function as 
void SetNewText(int p); // In the public section
void CYourClass::SetNewText(int p)
{
	CString s;
	m_editCtrl.GetWindowText(s);
	CString t;
	t.Format ("%d",p);
	s+=t;
	m_editCtrl.SetWindowText (s);

}

Now to use the function simply do
SetNewText(1); //if the user has clicked 1 and so on

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

-- modified at 9:27 Friday 7th July, 2006

Re: to make a phone

ThatsAlok9-Jul-06 20:42

ThatsAlok

9-Jul-06 20:42

yogendra kaushik wrote:
I want as in phone system when we press buttons they appear on screen
and when dial button is pressed phone dials.

try this :- http://www.codersource.net/mfc_array_controls.aspx

"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
Support CRY- Child Relief and You

SetTimer call in CWinThread

kumar_subrahmanya7-Jul-06 1:48

kumar_subrahmanya

7-Jul-06 1:48

Hi All,

I am using SetTimer API to create timers in a UI Thread (CWinThread
derived class)

The code looks as follows ->

m_timerId=::SetTimer(NULL,0,1000,NULL);

where m_timerId is a member data variable.

My Message map & onTimer looks as follows.

BEGIN_MESSAGE_MAP(CMyThread, CWinThread) <br />
ON_THREAD_MESSAGE(WM_TIMER, OnTimer) <br />
END_MESSAGE_MAP() <br />
<br />
<br />
void CMyThread::OnTimer(WPARAM wParam, LPARAM /*lParam*/) <br />
{ <br />
if(wParam==m_timerId) <br />
{ <br />
//timer processing code here <br />
<br />
<br />
<br />
} <br />
}

This code works!!!!!!!!!!!!!!!!
But SetTimer API documentation does not talk about the above usage.
(where in both hWnd and callback functions are NULL)

Has any one tried this kind of usage of SetTimer with CWinThread
object?
If yes, do let me know if you have encountered any problems.

Regards

PS : Most of the documentations talk only about SetTimer working with
either window object or a call back but never with CWinThread!!!. I
have also seen complicated work arounds to make SetTimer work with
CWinThread. So I am little concerned to use this approach.

Re: SetTimer call in CWinThread

David Crow7-Jul-06 2:55

David Crow

7-Jul-06 2:55

kumar_subrahmanya wrote:
But SetTimer API documentation does not talk about the above usage.
(where in both hWnd and callback functions are NULL)

Are you sure? Per MSDN:

hWnd
If this parameter is NULL, no window is associated with the timer and the nIDEvent parameter is ignored.

lpTimerFunc
If lpTimerFunc is NULL, the system posts a WM_TIMER message to the application queue.

Either can be NULL independent of the other.

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

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

Re: SetTimer call in CWinThread

kumar_subrahmanya9-Jul-06 20:19

kumar_subrahmanya

9-Jul-06 20:19

Well, MSDN says "If lpTimerFunc is NULL, the system posts a WM_TIMER message to the application queue." What is application Queue? is it the message queue of the thread which started the timer or it is "THE" applications main message queue?

Here in my code, I have both hWnd and timer call back as null and I am recieving the WM_TIMER messages at my thread message Queue!!!

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