here is my code
here my problem is once i got the value " 128 " my strtok(NULL,"> ") is pointing to "as" .Code:str=strtok(string,">") while(str!=NULL) { str=strtok(NULL,">"); . . . . . //here again i want to token suppose 128&as so char *str1; str1=strtok(str,"&"); }
but wht i want is my strtok should point to "string" .
wht should i do
thank u
sree
Post a more complete example, including an actual string you wish to tokenise, and more code than just all the strtok() calls.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
though I didnt understand what you wanted to do there..Code:str=strtok(string,">") while(str!=NULL) { str=strtok(NULL,">"); . . . . . //here again i want to token suppose 128&as so char *str1; str1=strtok(str,"&"); }
I think you are trying to change the delimiter after the first time call to strtok..
well in that case you dont have to give first arg to strtok.. keep it NULL
i will explain with example
char *string="<fdsjfdsfssassd>nbjnj&asdas>dsfds>"
now i want to delimit the string using ">"
char *str=strtok(string,">");
after tht if i found "&" then we delimit the string with "&"
if(strchr(str,'&')!=NULL)
str1=strtok(str,"&");
after i will continue the process until all ">" removed
so
once the strtok with "& "executed . the "strtok(NULL,">");" is refrence the str1 string not str .Code:char *string="<fdsjfdsfs&sassd>nbjnj>dsfds>" char *str=strtok(string,">"); while(str!=NULL) { str1=strtok(NULL,">"); if(strchr(str1,'&')!=NULL) str2=strtok(str1,"&"); //here is the problem }
thank u
sree
First thing i would say looking at this code is that it should give segfault.
as the strtok takes char*, but you are giving it string constant.. strtok changes the string you give it but if its read only(string constant) it will throw segfault..
hmm..Code:char *string="<fdsjfdsfs&sassd>nbjnj>dsfds>"; /*this gives you a string constant. this cant be changed in your code after declaration*/ char string[]="<fdsjfdsfs&sassd>nbjnj>dsfds>"; /*this gives you array of chars. and it can be changed in your code latter for now use this and not the first declaration*/
so you want sub delimiters..
strtok has sister function strtok_r
the man page had an example there as far as I remember.. and that is exactly what you wanted..
refer to your man pages
Last edited by gibsosmat; 11-07-2007 at 02:45 AM.
1. strtok() is NOT re-entrant, so you can't use it to extract tokens from TWO strings at the same time. Use strtok_r() if you have it.
2. Your string is a char constant, which on a lot of machines is in read-only memory, and will immediately get you a seg-fault.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
string is a string literal, you can't modify it (which strtok() does).
Are you just trying to remove '>' ?
Last edited by zacs7; 11-07-2007 at 02:43 AM.
