The strtok() function returns a pointer to the next "token" in str1, where str2 contains the delimiters that determine the token. strtok() returns NULL if no token is found. In order to convert a string to tokens, the first call to strtok() should have str1 point to the string to be tokenized. All calls after this should have str1 beNULL.

For example:

char str[] = "now # is the time for all # good men to come to the # aid of their country";
   char delims[] = "#";
   char *result = NULL;
   result = strtok( str, delims );
   while( result != NULL ) {
       printf( "result is \"%s\"\n", result );
       result = strtok( NULL, delims );
   }            

The above code will display the following output:

   result is "now "
   result is " is the time for all "
   result is " good men to come to the "
   result is " aid of their country"

使用这个函数,形如下面得配置文件就非常容易解析:

id1 value1 value2 value3

id2 value1 value2 value3

...

使用这个函数,分割字符串就更加方便了。