C / C++ / MFC

Re: Inserting string and increasing file size in istream ?

13-Mar-09 13:42

Appending the second onto the first? Something like this ought to work:

std::ofstream firstFile(whatever, std::ios_base::ate|std::ios_base::binary|std::ios_base::out);
std::istream secondFile(somethingElse, std::ios_base::in|std::ios_base::binary);
std::copy(std::istream_iterator<char>(secondFile), std::istream_iterator<char>(), std::ostream_iterator(firstFile));</char></char>

Inserting the second file in the first file at a position other than at the end? Yeah, you do that by constructing a third file from the first and second and then (if that's what you want to do) replacing the first file with the third file.

You can't easily insert something into an existing file.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

mmayur13-Mar-09 13:48

mmayur

13-Mar-09 13:48

Its not appending at the end, its inserting the second file in the middle of the first file?

Re: Inserting string and increasing file size in istream ?

Stuart Dootson13-Mar-09 14:06

Re: Hight price looking for talent c/c++ guru,

13-Mar-09 14:06

As I said:

Inserting the second file in the first file at a position other than at the end? Yeah, you do that by constructing a third file from the first and second and then (if that's what you want to do) replacing the first file with the third file.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

[Message Deleted]

zzgzzgok13-Mar-09 12:56

zzgzzgok

13-Mar-09 12:56

[Message Deleted]

CPallini13-Mar-09 13:12

CPallini

13-Mar-09 13:12

No advertising here. Mad | :mad:

Message reported as abuse.
Smile | :)

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-- Alfonso the Wise, 13th Century King of Castile.

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zzgzzgok13-Mar-09 13:14

zzgzzgok

13-Mar-09 13:14

[Message Deleted]

Re: Hight price looking for talent c/c++ guru,

Yusuf13-Mar-09 13:34

Yusuf

13-Mar-09 13:34

17 minutes and your message has not been deleted. prepare to get the wrath ....

Yusuf

Oh didn't you notice, analogous to square roots, they recently introduced rectangular, circular, and diamond roots to determine the size of the corresponding shapes when given the area. Luc Pattyn[^]

Regular expression

Demian Panello13-Mar-09 12:26

Demian Panello

13-Mar-09 12:26

Hi.

I need to generate a regular expression.
I use to do this by hand, in cases like the following:

I have:

340000000000000 349999999999999

and

370000000000000 379999999999999

they represents ranges, then I store in a database the following regular expresion:

3[4,7]%

That's easy.

But there are cases like:

6221260000000000 6229259999999999

that it's not so simple, but I used to solve that, (in this case with a few of regular expresions similar like the one above), but my head start to hurts. D'Oh! | :doh:

And, you know, there are another ranges that need very complex regular expressions.

So, my question is:
Somebody knows about a tool, or program (or maybe a class that I could use in my program) that it could help me to build regular expressions like the ones above, just with the input of that ranges?

Or maybe someone have some useful ideas about it.

I know, maybe this is not the right forum to post that, but I thought, just because I'm using C++...

Any help or hint will be appreciate it.

Thanks.

Demian.

"I have always wished that my computer would be as easy to use as my
telephone. My wish has come true. I no longer know how to use my telephone."
-Bjarne Stroustrup, computer science professor, designer of C++
programming language (1950- )

Re: Regular expression

BobInNJ13-Mar-09 12:44

I Think I need to free Something

13-Mar-09 12:44

First, realize that not all sets of numbers can be represented by regular expressions. For example, the set of all prime integers cannot be represented as a regular expression. Now, one way to represent the set of real numbers between 143 and 163 is as follows:
143|144|145|146|147|148|149|150|151|152|153|154|155|156|157|158|159|160|161|162|163
The problem is with this approach is that the range of numbers may be quite large and the corresponding regular expression excessively large. Here is another regular expression that is
smaller for the same range:
143|144|145|146|147|148|149|15(0|1|2|3|4|5|6|7|8|9)|160|161|162|163
I am thinking with this as a start, you can develop an algorithm for an arbitrary range and the regular expression is not going to be so big as to be unmanageable.

I hope I helped you and feel free to ask a follow up question.

Bob

Re: Regular expression

Demian Panello13-Mar-09 14:19

Demian Panello

13-Mar-09 14:19

Thanks Bob.

Well, that kind of stuff that you mention is what I used to do for every range, and there is always a solution. But, I just wonder if already exist a general way to solve this kind of problems.
I'm thinking to write a program (maybe in C++ or C#) that help me in my job to proccess these ranges.
Something like you enter a range of long numbers and then the programa list you all the regular expressions that help you to locate a value within that range.

Thank you very much for your help.

BobInNJ13-Mar-09 11:38

13-Mar-09 11:38

I am writing an application using C++ and MFC. Please consider the following routine:

<br />
HBRUSH<br />
CMainWindow::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)<br />
{<br />
	HBRUSH hbr = CFrameWnd::OnCtlColor(pDC, pWnd, nCtlColor);<br />
	if (pWnd->GetDlgCtrlID() == 2500 )   {<br />
		// Set the background mode for text to transparent<br />
		hbr = CreateSolidBrush(RGB(255, 255, 255));<br />
		pDC->SetBkColor( RGB( 255, 255, 255 ) );<br />
		// pDC->SetBkMode(TRANSPARENT);<br />
		return hbr;<br />
		<br />
	}<br />
	return hbr;<br />
}<br />

This routine is called via a message block. My belief is that ever time this routine is called, a new brush is created and it is not freed/deleted. I believe the routine should freeing/deleting the brush and I would like to know how to free/delete it.

Thanks

Bob

Stuart Dootson13-Mar-09 13:54

13-Mar-09 13:54

Yes, you ought to free the brush. Now, GDI might re-use the same brush for all solid white brushes (in which case you'll only ever create one brush), but you're probably better off creating the brush in your OnInitDialog method, assigning it to a data member and returning that from this method. You can delete that brsh in an OnClose handler or something like that.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

BobInNJ14-Mar-09 13:16

14-Mar-09 13:16

Stuart,

Thanks for the response. However this code is not part of a class derived from CDialog therefore, I do have a call to OnInitDialog. The base class is CFrameWnd and I was going to create the Brush when the window is first created. That is, I was going to do it in OnCreate(). Do you see any problems with that?

Now in terms of deleting the brush, can I do that by simply using the C++ operator delete? It seems to me that there should be a MFC method to delete a brush, but I can not seem to find it. I am hoping that you will tell me what it is?

Thanks

Bob

Stuart Dootson14-Mar-09 13:24

14-Mar-09 13:24

BobInNJ wrote:
That is, I was going to do it in OnCreate(). Do you see any problems with that?

Should be fine

BobInNJ wrote:
Now in terms of deleting the brush, can I do that by simply using the C++ operator delete? It seems to me that there should be a MFC method to delete a brush, but I can not seem to find it. I am hoping that you will tell me what it is?

The CBrush destructor (well, actually, the destructor of its base class, CGDIObject) deletes the GDI object. All you need to do is make sure the CBrush is destructed properly.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

BobInNJ14-Mar-09 14:16