Your Ad Here

advanced code snippet search

Posted By

jimfred on 04/27/09


Tagged


Versions (?)

CSzEnumerator

 / Published in: C++
 

This is an enumerator that marches through a string of strings such as "aaa\0bbb\0ccc\0\0" that has "\0" delimiters and a "\0\0" terminator. It's modeled upon IEnumerator in dot.net (has Reset, MoveNext etc).

To simplify, use technique in MoveNext that increments a pointer as follows: p += strlen(p) + 1; if ( !*p ) { p = 0; }

This is useful for Win32 REGMULTISZ (multi-string) values that use \0 delimiters and \0\0 terminators such as GetCommandLine() and registry APIs.

Expand | Embed | Plain Text 
  1. // Enumerator that marches thru a string of strings such as "aaa\0bbb\0ccc\0\0" that has "\0" delimiters and a "\0\0" terminator.
  2. // modeled upon IEnumerator in dot.net: has Reset, MoveNext etc.
  3. class CSzEnumerator 
  4. {
  5. private:
  6.    LPCSTR s; // beginning of string. 
  7.    LPCSTR p; // enumerator.
  8.  
  9. public:
  10.    /*constructor*/ CSzEnumerator( LPCSTR arg=0 )
  11.    {
  12.       Reset(arg);
  13.    }
  14.  
  15.    void Reset( LPCSTR arg=0 )
  16.    {
  17.       if ( arg ) { s = arg; }
  18.  
  19.       p = (LPCSTR)s;
  20.  
  21.       //  handle empty string condition to prevent starting enumeration.
  22.       if ( !*p ) { p = 0; }
  23.    }
  24.  
  25.    LPCSTR Current()
  26.    {
  27.       return p;
  28.    }
  29.  
  30.    void MoveNext()
  31.    {
  32.       p += strlen(p) + 1;
  33.  
  34.       if ( !*p ) { p = 0; }
  35.    }
  36.  
  37. }; // CSzEnumerator

Report this snippet  

You need to login to post a comment.