Re: detecting alpha characters in a string - C / C++ / MFC Discussion Boards

Valeria Bogdevich23-Jul-03 4:53

23-Jul-03 4:53

You should override PretranslateMessage of view/dialog
If you button is focused and < Enter > is pressed, call your routine.

"...hasn't really been well accepted as far as the ratings tell us so far " - Nishant S

Thread Pool

peace maker23-Jul-03 4:40

peace maker

23-Jul-03 4:40

Hello all

I wonder, does anyone knows the limit for of threads that the Os is allowing for one application to open ?

10x'

Re: Thread Pool

Xiangyang Liu 刘向阳23-Jul-03 4:52

Xiangyang Liu 刘向阳

23-Jul-03 4:52

I believe you can have as many threads as the memory and CPU can tolerate. I once had more than 100 threads in a single test application running on Windows NT 4.0. But if you have too many threads, some of them will starve (not gettting any share of CPU to do anything) and the memory usage goes up quickly.

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Re: Thread Pool

Joe Woodbury23-Jul-03 7:29

Joe Woodbury

23-Jul-03 7:29

The practical limit is far below the physical limit. (Except in rare cases, I question using more than a few dozen threads and for the exceptions, more than a few hundred [and for those few cases, the code could, and should, have been rewritten to use I/O Completion ports].)

detecting alpha characters in a string

si_6923-Jul-03 4:26

si_69

23-Jul-03 4:26

hi all

does ne1 know the best function to use to detect
if a string contains Alpha characters

so if i had CString mystring = "55545kjfk"

would return true

or if i had CString mystring = "55545"

would return false

thanks all

si

Re: detecting alpha characters in a string

Alexander ^M.,23-Jul-03 4:31

Alexander ^M.,

23-Jul-03 4:31

write an own algorithm, it's the easiest way i think

Don't try it, just do it! Wink | ;-)

Re: detecting alpha characters in a string

AlexO23-Jul-03 4:38

AlexO

23-Jul-03 4:38

in <ctype.h> (CRT) look for the functions :

::isalpha
::isalnum
::isdigit
::isxdigit

Re: detecting alpha characters in a string

Ryan Binns23-Jul-03 4:48

Ryan Binns

23-Jul-03 4:48

bool containsAlphaCharacters(CString str)
{
   str.MakeLower();
   return(str.FindOneOf(_T("abcdefghijklmnopqrstuvwxyz")) >= 0);
}

#include <ctype.h>
bool containsAlphaCharacters(CString str)
{
   for(int i=0; i<str.GetLength(); i++)
   {
      if(_istalpha(str[i]))   // Unicode-aware...
         return true;
   }
   return false;
}

Hope this helps,

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: detecting alpha characters in a string

si_6923-Jul-03 5:37

si_69

23-Jul-03 5:37

cheers ryan,

nice one

Big Grin | :-D

Re: detecting alpha characters in a string

Ryan Binns23-Jul-03 5:41

Ryan Binns

23-Jul-03 5:41

You're welcome Smile | :)

If you feel up to it, do a bit of a speed comparison and let me know which one is quicker Smile | :)

. They're probably about the same, but the first one will probably be slightly slower.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

problem getting data from a list box

Deepak Samuel23-Jul-03 4:16

Deepak Samuel

23-Jul-03 4:16

halo,
I have a application which has two list box and my plan is that i must retrieve the data in the list box and somehow save it (perhaps in a integer variable) and if the data in both the liat boxes are same then there must be a error message displayed.. I tried out the following:

void Cdlg3Dlg::OnCamdone()
{
int i=0;
CListBox* m_ptele;
CListBox* m_pls1;
if (m_ptele->GetItemData(i)==m_pls1->GetItemData(i))
{ AfxMessageBox("Both boxes have same data");

}
}
but when i run the program i get the microsoft error box problem:
The xxxxxx application has encountered a problem and needs to close. We are sorry for the inconvenience. If you were in the middle......and so on.

i want to know whether it is the problem with my program..and if it is so can someone help me out.
Thanks,

Deepak Samuel

Re: problem getting data from a list box

Alexander ^M.,23-Jul-03 4:20

Alexander ^M.,

23-Jul-03 4:20

read LB_GETITEMDATA in msdn... it's the wrong function u chose!
use GetText member function!

Don't try it, just do it! Wink | ;-)

Re: problem getting data from a list box

valikac23-Jul-03 5:03

valikac

23-Jul-03 5:03

One solution is GetItemText() as the other member has mentioned.

Kuphryn

Re: problem getting data from a list box

David Crow23-Jul-03 5:08

David Crow

23-Jul-03 5:08

Deepak Samuel wrote:
CListBox* m_ptele;
CListBox* m_pls1;

These are uninitialized pointers.

can I add my own methods to CList

mr200323-Jul-03 4:04

mr2003

23-Jul-03 4:04

Hi,
I would like to know if I can add few methods to class Clist.

Ehsan Behboudi

Re: can I add my own methods to CList

Alexander ^M.,23-Jul-03 4:06

Alexander ^M.,

23-Jul-03 4:06

create a class derived from CList and put your methods there...

Don't try it, just do it! Wink | ;-)

how to use friend function?

IT_student23-Jul-03 4:04

IT_student

23-Jul-03 4:04

i want to share the member variables and function between the various classes.what all methods can i use to achieve it?also, how do i use a friend function ?

Every problem has a solution!

Re: how to use friend function?

Alexander ^M.,23-Jul-03 4:09

Alexander ^M.,

23-Jul-03 4:09

lol, i think this is a lama question for an it student, if your really one...

describe your situation a bit better... i dont really understand what your problem is

p.s. description for friend function-> see msdn

Don't try it, just do it! Wink | ;-)

Re: how to use friend function?

IT_student23-Jul-03 4:23

IT_student

23-Jul-03 4:23

Actually i am making a program for a cnc machine. I have made various classes and i wished that what all info i entered in the dialog box, should be depicted in view.
Unfortunately, the view is executed even before i enter values in the dialog box.
is there any method by which i cud add a kind of delay to prevent the execution of view until i press ok.
when i wrote the code for OnOk it didn't call the ondraw function from there so i thought i shud use a friend function . i know how to use a friend function but as i am new to VC++ i wanted to know if some special method is used.
I don't have MSDN library so thats where the problem is coming and YES i am an IT student.

Every problem has a solution!

Re: how to use friend function?

Alexander ^M.,23-Jul-03 4:34

Alexander ^M.,

23-Jul-03 4:34

do u launch the view in a different thread??
normally a DialogBox function is a blocking call

Don't try it, just do it! Wink | ;-)

How do I break up a string?

Tom Wright23-Jul-03 3:36

Tom Wright

23-Jul-03 3:36

I'm receiving a string of characters over a socket connection. I know that the string is of a number of fields that are a fixed length. How can I break up this string where each fixed length field goes into it's own member variable?

Being a cobol programmer too, in cobol we can just move it into a structure where the structure is set with all the fields and their fixed lengths. Can I do this in VC also?

Thanks

Tom Wright
tawright915@yahoo.com

Re: How do I break up a string?

keegan23-Jul-03 3:45

keegan

23-Jul-03 3:45

if your string was called "strings" and it is comprised of integers you could to this...

<br />
int temp0 = strings.at(0);<br />
int temp1 = strings.at(1);<br />

*.*
cin >> knowledge;

Re: How do I break up a string?

Tom Wright23-Jul-03 3:56

Tom Wright

23-Jul-03 3:56

actually my code looks like this:

<br />
char *pBuf = new char[1025];<br />
int iRcvd;<br />
int iBufsize;<br />
<br />
iRcvd = m_sConnectionSocket.Receive(pBuf, iBufsize);<br />

pBuf is my string that I want to parse out into fixed fields. The fields that are in the string being sent (pBuf) are fixed length.

Tom Wright
tawright915@yahoo.com

Re: How do I break up a string?

David Crow23-Jul-03 4:03

David Crow

23-Jul-03 4:03

See if AfxExtractSubString() is of any help. If not, try strtok().

Re: How do I break up a string?

Alexander ^M.,23-Jul-03 4:11

Alexander ^M.,

23-Jul-03 4:11

you can do this in vc, too....
define a structure with fixed size and copy the data in it!

structure only means, that the compiler knows, where it can find the data!

Don't try it, just do it! Wink | ;-)

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