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split a string with string.h

Started by nick5454 May 8, 2003 at 10:08 PM 12 replies 850+ views

Original Post

May 8, 2003 at 10:08 PM

Does string.h have a function much like split in VB. By that I mean I have a comma delimited string. Does string.h have one that will split into a char array od some sort?

Sneftel

297

Sneftel

May 8, 2003 at 10:14 PM

yeah, there''s strtok. But it kind of really sucks. In C++, you can use stringstreams instead, which are more useful and flexible.

How appropriate. You fight like a cow.

nick5454

Author

nick5454

May 8, 2003 at 10:20 PM

is.getline(s1,100,'' '');
temps1 = (char*)memchr(s1,'','',sizeof(s1));

if ( temps1 != NULL )
count << temps1-s1+1

I got that code which gives me the end location

s1 is the string ( char *)
temps1 is the ptr to the comma

so I want the first 3 chars like say 31 to 34 in memory, is there a function that will create a char* from those locations?

nick5454

Author

nick5454

May 8, 2003 at 10:22 PM

i guess like the mid function in basic

nick5454

Author

nick5454

May 8, 2003 at 10:23 PM

or do i write my own little function

nick5454

Author

nick5454

May 8, 2003 at 10:24 PM

maybe memccpy but not sure

Sneftel

297

Sneftel

May 9, 2003 at 3:56 AM

strtok. stringstream. boost::tokenizer. Use one of those.

How appropriate. You fight like a cow.

Ishan

May 9, 2003 at 1:40 PM

quote:
Original post by nick5454
is.getline(s1,100,' ');
temps1 = (char*)memchr(s1,',',sizeof(s1));

if ( temps1 != NULL )
count << temps1-s1+1

I got that code which gives me the end location

s1 is the string ( char *)
temps1 is the ptr to the comma

so I want the first 3 chars like say 31 to 34 in memory, is there a function that will create a char* from those locations?

  

#include <vector>
using std::vector;

vector<string> strchop(string s,char delim = ','){
	unsigned int i = 0;
	vector<string> ret;
	string tmp;
	
	while(i < s.size()){
		if(s[i] == delim){
			ret.push_back(tmp);
			tmp = "";
		} else tmp += s[i];
		i++;
     }
	if(tmp != "") ret.push_back(tmp);
     return ret;
}

This seems to be the most elegant solution that comes to mind. Just run strchop("i,like,cookies!!") and you'll get the appropriate vector.

[edited by - Ishan on May 9, 2003 2:42:19 PM]

daerid

May 9, 2003 at 1:56 PM

wow.. nice code. I''ve been beating myself up using string::find and string::substr for way too long.

Thanks!

nick5454

Author

nick5454

May 9, 2003 at 4:37 PM

so what would be faster using memcpy with char* or the vector?

antareus

May 9, 2003 at 10:54 PM

quote:
Original post by nick5454
so what would be faster using memcpy with char* or the vector?

memcpy with char* unless you really mess up.

You should be asking: what would be clearer ? We''re talking about splitting hairs here when it comes to execution efficiency.