Question

Tokenize a CString

Asked by: rkaikini

I am trying to tokenize a CString and was using VC++6 at home while at work I am using VC++5. I spent a lot of time at home coming up with this algorithm to tokenize a CString that looks like this:

2.0,3.0,4.0 (delimiters can be commas or spaces.)

before I realized that I the CString functions have changed in the newest version of MFC.  Is there a way I can use a similar alogorithm with the limitation of being able to use only CString::Find(char ch) that accepts just the char you are looking for and not the starting position as well?  If not, how could I tokenize a CString to grab these data points?

Here is a snippet of my code:

//.......

while(r < return_data.GetLength()) {
                        if(return_data.Find("," || " ", r) != -1){
                              index = return_data.Find("," || " ",r);
                              data_points[w] = return_data.Mid(r,index-r);
                              r = index+1;
                        }
                        else {
                              data_points[w] = return_data.Mid(r,return_data.GetLength()-(index+1));
                              r = return_data.GetLength();
                        }
                        w++;                  
//......

Thanks for your help.

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Asked On
2000-07-18 at 08:45:31ID10735701
Tags

cstring

,

tokenize

Topic

Windows MFC Programming

Participating Experts
4
Points
50
Comments
10

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Answers

 

by: mandhjoPosted on 2000-07-18 at 09:11:29ID: 3449312

how about set return_date = to the remaining string after the last token removed?

Place something like the following right before "r = index + 1"

return_data = return_data.Right(return_data.GetLength() - (index + 1));

As the data is searched, the string that is searched becomes smaller and smaller.

First Time through - 2.0,3.0,4.0
Next Time - 3.0,4.0
Last Time - 4.0


Make sense?

 

by: MT_MUPosted on 2000-07-18 at 09:14:01ID: 3449340

Personally I cheat and use strtok().

 

by: abancroftPosted on 2000-07-18 at 09:49:48ID: 3449976

If the string contains a fixed number of tokens, you could use sscanf().

 

by: RONSLOWPosted on 2000-07-18 at 16:34:53ID: 3455912

>if(return_data.Find("," || " ", r) != -1){
>index = return_data.Find("," || " ",r);

You cannot use || like this ... it just WONT work that way, and NEVER would have.

Use FindOneOf instead of Find to do this eg. FindOneOf(", ") .. however, FindOneOf doesn't iunclude a starting position.

Also, look at SpanExcluding and SpanIncluding which give you a (leading) substring bounded by tokens or containing certain characters respectively.

If all you want to do is read numbers that are comma separated, just use sscanf instead, or use std C++ streams and use <<.

 

by: rkaikiniPosted on 2000-07-18 at 19:44:25ID: 3457398

-I know that
>if(return_data.Find("," || " ", r) != -1){
>index = return_data.Find("," || " ",r);
wouldn't work . . .I just put those in as a mental note and forgot to take out before I posted it, sorry.

-FindOneOf() doesn't do me much good if it doesn't have a starting position.  I can just use Find()

-either does spanIncluding()

-I want to return CStrings . . .

I think my best bet is to do something like mandhjo suggested . . .

 

by: rkaikiniPosted on 2000-07-18 at 19:45:48ID: 3457405

I am still open to other suggestions. . .

 

by: RONSLOWPosted on 2000-07-18 at 19:52:10ID: 3457446

The span functions are nicest.  You could use them like this...

CString RemoveTokenWithSeparators(CString& string LPCTSTR charset) {
  CString token = string.SpanExcluding(charset);
  string = string.Mid(token.GetLength());
  return token;
}

CString RemoveTokenFromCharset(CString& string LPCTSTR charset) {
  CString token = string.SpanIncluding(charset);
  string = string.Mid(token.GetLength());
  return token;
}

Now you could say

CString s = "1.0,2.0,3.0";
while (! s.IsEmpty()) {
  CString token = s.RemoveTokenWithSeparators(", ");
  ...
}

 

by: RONSLOWPosted on 2000-07-18 at 20:04:22ID: 3457537

missed a couple of commas there .. but you should get the idea.

>-I know that
>>if(return_data.Find("," || " ", r)
>>index = return_data.Find("," || " ",r);
>wouldn't work . . .I just put those in
>as a mental note and forgot to take
>out before I posted it, sorry.

Maybe you should edit the question accordingly?

>-FindOneOf() doesn't do me much good
>if it doesn't have a starting
>position.  I can just use Find()

No, you cannot use find in that case, as find only look for a particular substring, whereas FindOneOf looks for a character from a set of characters .. very different.  You'd need to write quite a bit of code to emulate FindOneOf using Find.

>-either does spanIncluding()

But it is probably the best for what you want to do (ie. break up based on tokens).  Either that or using FindOneOf.

>-I want to return CStrings . . .

See my new answer

 

by: rkaikiniPosted on 2000-07-18 at 21:08:09ID: 3457912

Answer accepted

 

by: rkaikiniPosted on 2000-07-18 at 21:08:09ID: 3457913

I see where you are coming from with spanIncluding and spanExcluding . . .great.  Thanks.

20120131-EE-VQP-002

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