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How can I split a string by a string delimeter in MFC?

Posted on 2009-05-08
10
1,310 Views
Last Modified: 2013-11-20
Hi all,

I have the need to split a string by a specified string, ie...

   Hello<->Everyone<-><->How<->Are You

based on the delimeter '<->' needs to produce the following array:

   a[0] = 'Hello'
   a[1] = 'Everyone'
   a[2] = ''
   a[3] = How
   a[4] = Are You

Can anyone help?

Thanks,

James
0
Comment
Question by:jatkin
  • 3
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  • +1
10 Comments
 
LVL 3

Expert Comment

by:janjerell
ID: 24334232
HI Try this:


string s2 = "Hello<->Everyone<-><->How<->Are You";

string[] a = s2.Split(new string[] { "<->" },StringSplitOptions.None);

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LVL 19

Expert Comment

by:alb66
ID: 24334249
MFC has no specific methods.
You can use strtok():
http://msdn.microsoft.com/en-us/library/2c8d19sb(VS.71).aspx
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LVL 4

Author Comment

by:jatkin
ID: 24334250
Sorry, this is an MFC issue - sadly the above is not possible :-(
0
 
LVL 4

Author Comment

by:jatkin
ID: 24334269
the above response was in response to janjerell's comment.

alb66, the problem i have with the strtok functions is that they ignore multiple delimeters and do not return blank entries as above...
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LVL 19

Expert Comment

by:alb66
ID: 24334292
Yes yor are right...
You need to write your own function:
CString CUtility::ExtractString ( CString& stringa, BOOL* pbLast, const CString& strSepa )

{

	BOOL bLast;
 

	CString  str;

	int pos = stringa.Find( strSepa );

	if( pos != -1 )

	{

		str = stringa.Left( pos );

		stringa = stringa.Mid( pos + strSepa.GetLength() );

		bLast = FALSE;

	}      

	else

	{

		str = stringa;

		bLast = TRUE;

	}
 

	if ( pbLast != NULL )

		*pbLast = bLast;
 

	return str;

}
 
 
 

CString strTest( "Hello<->Everyone<-><->How<->Are You" );

CStringArray vstr;
 

BOOL bLast = !strTest.IsEmpty();

while ( !bLast )

  vstr.Add( CUtility::ExtractString ( strTest, &bLast, "<->" ));

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LVL 30

Accepted Solution

by:
Zoppo earned 500 total points
ID: 24334294
Hi jatkin,

attached you can find a function which does it. Just call it like this:

> CString strText = "Hello<->Everyone<-><->How<->Are You";
> CStringArray tokens;
> ParseTokens( strText, "<->", tokens );

Hope that helps,

ZOPPO
void

ParseTokens( CString strString, CString strDelimiter, CStringArray& tokens )

{

	int iNum = 0;
 

	int iCurrPos= 0;
 

	while( -1 != ( iCurrPos = strString.Find( strDelimiter ) ) )

	{

		tokens.Add( strString.Left( iCurrPos ) );
 

		strString = strString.Right( strString.GetLength() - iCurrPos - strDelimiter.GetLength() );

	}
 

	tokens.Add( strString );

}

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LVL 3

Expert Comment

by:janjerell
ID: 24334296
oh sorry.. didn't notice it was MFC...
0
 
LVL 30

Expert Comment

by:Zoppo
ID: 24334307
ehm sorry, the function has a little failure - the first line 'int iNum' is not needed, you can delete it ...
0
 
LVL 4

Author Closing Comment

by:jatkin
ID: 31579354
Perfect, thanks!!!
0
 
LVL 30

Expert Comment

by:Zoppo
ID: 24334457
You're welcome - I'm glad I could help.

Have a nice day,

best regards,

ZOPPO
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