C / C++ / MFC Discussion Boards

gxkendall14-Jan-07 6:59

14-Jan-07 6:59

No, I have copied/pasted from the above records (as they are zeroes) and also manually put in zeroes, but same result.

There are definitely 3 zeroes before the 8.

Cheers

Graham

Re: ifstream problem

CPallini14-Jan-07 7:21

CPallini

14-Jan-07 7:21

Can you please provide a code snippet showing the declaration of the variables?

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.

Re: ifstream problem

gxkendall14-Jan-07 7:32

gxkendall

14-Jan-07 7:32

Sure

In a header file

struct data {
int idx_;
int noOfRegs_;
} *data_;

.. and then later (in a function) ...

int records_in_file = 152;
CString fname = "..//Data//sta-f-83.crs";
data_ = new data[records_in_file];

// and this is what I posted earlier

ifstream f_;
f_.open(fname);

while(i < records_in_file) {
f_ >> data_[i].idx_ >> ws;
f_ >> data_[i].noOfRegs_ >> ws;
i++;
}

Thx

Graham

Re: ifstream problem

Michael Dunn14-Jan-07 8:55

Michael Dunn

14-Jan-07 8:55

As a wild guess I'd say it's interpreting the numbers as octal due to the leading 0. 8 is not a legal octal digit so the stream stops reading after "000" which is why you get 0.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ");

Re: ifstream problem

gxkendall14-Jan-07 8:56

gxkendall

14-Jan-07 8:56

Thanks

So what do I do? Smile | :)

Graham

Re: ifstream problem

Michael Dunn14-Jan-07 9:54

Michael Dunn

14-Jan-07 9:54

I don't know the stream classes well enough, I would guess that there is a function or manipulator that will make it parse numbers as base 10.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ");

Re: ifstream problem

CPallini14-Jan-07 10:47

CPallini

14-Jan-07 10:47

Use f_.setf(ios::dec) just befor reading values. For istance:

f_.setf(ios::dec);
while(i < records_in_file) {
  f_ >> data_[i].idx_ >> ws;
  f_ >> data_[i].noOfRegs_ >> ws;
  i++;
 }

I have to admit, Michael Dunn was very clever. 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.

Re: ifstream problem

gxkendall14-Jan-07 11:22

gxkendall

14-Jan-07 11:22

Just quickly tried it - need to fully test - but looks good.

Thanks both. I owe you one.

Cheers

Graham

Re: ifstream problem

Michael Dunn14-Jan-07 14:21

Michael Dunn

14-Jan-07 14:21

I'm working on my psychic debugging powers. Wink | ;)

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ");

Re: ifstream problem

PJ Arends14-Jan-07 15:00

PJ Arends

14-Jan-07 15:00

Michael Dunn wrote:
I'm working on my psychic debugging powers

Hey Mike, I have a bug. How can I fix it?

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

Re: ifstream problem

Michael Dunn14-Jan-07 15:17

Michael Dunn

14-Jan-07 15:17

Install Linux!

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ");

Re: ifstream problem

CPallini15-Jan-07 9:15

CPallini

15-Jan-07 9:15

If you haven't already done, ASK MIKE!!! 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.

Re: ifstream problem

CPallini15-Jan-07 9:14

CPallini

15-Jan-07 9:14

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.

Do I need to delete?

gumi_r@msn.com14-Jan-07 2:52

gumi_r@msn.com

14-Jan-07 2:52

Hi all,

my question is if I define a class myClass with destructor, assign operator (=) and copy constructor, etc etc.

If I later use my class like this:

myClass &a=*new myClass(whatever);
myClass &b=a;

Do I have to explicitly delete b? I've read you should only delete a class if you have instantiated it with a new. I know that behind the curtains b is created with a new call inside the dll, but do I have to delete it explicitly from my app?

thanks

Re: Do I need to delete?

CPallini14-Jan-07 3:21

CPallini

14-Jan-07 3:21

gumi_r@msn.com wrote:
myClass &a=*new myClass(whatever);
myClass &b=a;

since you've dynamically allocated memory for an istance of myClass, then you have to delete it somewhere. You can call either delete &b or delete &a (of course don't call both).

Cheers
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.

Re: Do I need to delete?

gumi_r@msn.com14-Jan-07 3:52

gumi_r@msn.com

14-Jan-07 3:52

Ok thanks. That makes sense as I'm already deleting any pointers I need to inside my copy constructor.

Next step would be the assignment operator. Say for example y have:

myClass &a=*new myClass(whatever);
myClass &b=*new myClass(whatever);

myClass &c=a+b;

do I have to delete &c?

thanks for any replies.

Re: Do I need to delete?

CPallini14-Jan-07 5:48

CPallini

14-Jan-07 5:48

gumi_r@msn.com wrote:
myClass &c=a+b;

IMHO you should not do this, because you're trying to assign a reference to a temporary object. For instance, the following is noy allowed(the compiler complains about):

int &i= *new int(5);
int &j=i;
int &k=i+j;// ERROR

BTW: Doing some experimentation?

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.

Re: Do I need to delete?

Stephen Hewitt14-Jan-07 15:35

Stephen Hewitt

14-Jan-07 15:35

It is not illegal if you use a const reference.

Steve

Re: Do I need to delete?

CPallini15-Jan-07 9:22

CPallini

15-Jan-07 9:22

Yeah, I didn't know it. Thank you (though seems rather clumsy...).

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.

How to give a File New command from inside a program

IlanTal14-Jan-07 0:47

IlanTal

14-Jan-07 0:47

I would like to give a command from inside my program to do a File New command.
I tried pApp->CWinApp::OnFileNew() but it tells me I can't access a protected member.
Fair enough, but is there some system command I can give instead?

Thanks,
Ilan

Re: How to give a File New command from inside a program

#realJSOP14-Jan-07 1:06

#realJSOP

14-Jan-07 1:06

Try this:

::PostMessage(AfxGetMainWnd()->GetSafeHwnd(), ID_FILE_OPEN, 0, 0);

or even

AfxGetMainWnd()-> PostMessage(ID_FILE_OPEN, 0, 0);

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Re: How to give a File New command from inside a program

IlanTal14-Jan-07 1:39

IlanTal

14-Jan-07 1:39

Up front it looks like a good idea, but I put in break points and it doesn't reach them. So, I'm still stuck on the proper way to do it.

Re: How to give a File New command from inside a program

#realJSOP14-Jan-07 2:18

#realJSOP

14-Jan-07 2:18

You're going to have to give more detail if you want help. WHERE did you put the breakpoints?

Re: How to give a File New command from inside a program

IlanTal14-Jan-07 2:33

IlanTal

14-Jan-07 2:33

Sorry, I didn't realize you continued to look at my posts.
I have break points at both OnNewDocument and OnOpenDocument

<br />
<br />
BOOL CCardiacDoc::OnNewDocument()<br />
{<br />
	char buff[100];<br />
	if( m_dataDirectory.GetLength() == 0 && _getcwd(buff, 98)) {<br />
		m_dataDirectory = buff;<br />
		m_dataDirectory += "\\*";<br />
	}<br />
	if (!CDocument::OnNewDocument())<br />
		return FALSE;<br />
<br />
	// TODO: add reinitialization code here<br />
	// (SDI documents will reuse this document)<br />
<br />
	return TRUE;<br />
}<br />
<br />
BOOL CCardiacDoc::OnOpenDocument(LPCTSTR lpszPathName)<br />
{<br />
	m_dataDirectory = lpszPathName;<br />
	int j = m_dataDirectory.ReverseFind('\\');<br />
	if( j > 0) {<br />
		m_dataDirectory = m_dataDirectory.Left(j+1) + "*";<br />
	}<br />
	if (!CDocument::OnOpenDocument(lpszPathName))<br />
		return FALSE;<br />
<br />
	// TODO:  Add your specialized creation code here<br />
<br />
	return TRUE;<br />
}<br />

I see that when I start the program it goes to OnNewDocument. Likewise, before I override the OnOpen, it goes to OnOpenDocument. The function I use is:

<br />
void CCardiacDoc::OnFileOpen()<br />
{<br />
	CString path1;<br />
	int flags;<br />
	CFileDialog fdlg( true, NULL, "dummy entry");<br />
	fdlg.m_ofn.lpstrTitle = "Choose directory";<br />
	flags = fdlg.m_ofn.Flags;<br />
	fdlg.m_ofn.Flags = flags;<br />
	if( fdlg.DoModal() == IDOK)<br />
	{<br />
		path1 = fdlg.m_ofn.lpstrFile;<br />
		int i = path1.GetLength();<br />
		i -= (int) strlen(fdlg.m_ofn.lpstrFileTitle);<br />
		m_dataDirectory = path1.Left(i) + "*";<br />
		AfxGetMainWnd()->PostMessage(ID_FILE_NEW, 0, 0);<br />
	}<br />
}<br />

It never again reaches OnNewDocument. If I would use ID_FILE_OPEN (which I tried), I would expect it to reach my overridden routine, which it doesn't. I really want it to go to OnNewDocument which I why I assume you had a small typo.

Thanks,
Ilan

Re: How to give a File New command from inside a program

#realJSOP14-Jan-07 2:53

#realJSOP

14-Jan-07 2:53

Well see? That's completely different than what you originally asked.

In OnOpenFile(), instead of posting the ID_FILE_OPEN message, try this line instead:

OpenDocumentFile(path1);

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