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

Posted on 2009-05-08
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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
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Question by:jatkin
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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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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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Author Comment

by:jatkin
ID: 24334250
Sorry, this is an MFC issue - sadly the above is not possible :-(
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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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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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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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Expert Comment

by:janjerell
ID: 24334296
oh sorry.. didn't notice it was MFC...
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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 ...
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Author Closing Comment

by:jatkin
ID: 31579354
Perfect, thanks!!!
0
 
LVL 31

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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