Split functionality for MFC Cstring Class

Question

How to Split a CString object by delimeter in vc++?

For example I have a string value

"one+two+three+four"

into a CString varable.

score 42 · Accepted Answer · edited May 23 '17 at 11:33

42

CString str = _T("one+two+three+four");

int nTokenPos = 0;
CString strToken = str.Tokenize(_T("+"), nTokenPos);

while (!strToken.IsEmpty())
{
    // do something with strToken
    // ....
    strToken = str.Tokenize(_T("+"), nTokenPos);
}

edited May 23 '17 at 11:33

Community

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answered Jun 30 '10 at 07:42

sje397

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Hi, Tokenize is not supported in VC6 MFC, But supported in ATL – Dharma Jun 30 '10 at 09:07
You should probably add that requirement to the question. – sje397 Jun 30 '10 at 09:18
4

[The docs for CStringT::Tokenize()](http://msdn.microsoft.com/en-us/library/k4ftfkd2.aspx) say that the function skips leading delimiters, so if you truly want to split a string and not ignore empty substrings, then I would say that you can't use `Tokenize()`. For instance, "+one+two+three+four" would not yield the expected result of 5 substrings. – herzbube Feb 24 '12 at 11:11

score 25 · Answer 2 · edited Feb 04 '21 at 05:45

25

CString sInput="one+two+three";
CString sToken=_T("");
int i = 0; // substring index to extract
while (AfxExtractSubString(sToken, sInput, i,'+'))
{   
   //.. 
   //work with sToken
   //..
   i++;
}

AfxExtractSubString on MSDN.

edited Feb 04 '21 at 05:45

Andrew Truckle

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answered Jun 30 '10 at 09:27

Dharma

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That's one problem with crappy OO and poor APIs - functions all over the place :) Good find. – sje397 Jun 30 '10 at 09:34
6

You can answer your own question. It's in the FAQ. – sje397 Jul 14 '10 at 15:38
3

I would change the comma separator to a plus-sign, or the example won't work. – Niki Romagnoli Nov 25 '14 at 07:55

score 11 · Answer 3 · edited Dec 14 '11 at 17:42

11

int i = 0;
CStringArray saItems;
for(CString sItem = sFrom.Tokenize(" ",i); i >= 0; sItem = sFrom.Tokenize(" ",i))
{
    saItems.Add( sItem );
}

edited Dec 14 '11 at 17:42

Yuck

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answered Dec 14 '11 at 17:35

Flubert

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score 7 · Answer 4 · edited Feb 04 '21 at 05:44

7

In VC6, where CString does not have a Tokenize method, you can defer to the strtok function and it's friends.

#include <tchar.h>

// ...

CString cstr = _T("one+two+three+four");
TCHAR * str = (LPCTSTR)cstr;
TCHAR * pch = _tcstok (str,_T("+"));
while (pch != NULL)
{
  // do something with token in pch
  // 
  pch = _tcstok (NULL, _T("+"));
}

// ...

edited Feb 04 '21 at 05:44

Andrew Truckle

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answered Jun 30 '10 at 09:26

sje397

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`TCHAR * str = (LPCTSTR)cstr` will throw a compiler error as `a value of type "LPCTSTR" cannot be used to initialize an entity of type "TCHAR *"`. You should use `TCHAR * str = cstr.GetBuffer();` – Sisir Jun 04 '19 at 10:10

Split functionality for MFC Cstring Class

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