DevX Home    Today's Headlines   Articles Archive   Tip Bank   Forums   

Results 1 to 2 of 2

Thread: C++ Buffer Manipulation... memchr

  1. #1
    Brian Guest

    C++ Buffer Manipulation... memchr


    void *memchr( const void *buf, int c, size_t count );

    The function memchr is supposed to return a pointer to c (if it is found).
    At least this is what MSFT says. However, notice that the return type is
    "void" in the example above. It doesn't seem to return the pointer like
    it is suppossed to.

    I am trying to find a character in a buffer so that I can copy it out to
    a string or character array (in other words... I want to pull sets of data
    from a buffer using a delimiter). Memchr should help me do this, but I can't
    get it to work.

    Any ideas??

  2. #2
    Danny Kalev Guest

    Re: C++ Buffer Manipulation... memchr

    if you look carefully, the return type is 'void *' which is very
    different from plain void. All you have to do is cast the resulting
    pointer to char * or const char *.

    There are much better ways to search a substring using real C++ strings.
    However, if your code relies on char * buffers, then you'd probably
    prefer to use <mem.h> and <string.h> functions instead. Look at the
    strstr() function and strchr() in particular.

    Danny

    Brian wrote:
    >
    > void *memchr( const void *buf, int c, size_t count );
    >
    > The function memchr is supposed to return a pointer to c (if it is found).
    > At least this is what MSFT says. However, notice that the return type is
    > "void" in the example above. It doesn't seem to return the pointer like
    > it is suppossed to.
    >
    > I am trying to find a character in a buffer so that I can copy it out to
    > a string or character array (in other words... I want to pull sets of data
    > from a buffer using a delimiter). Memchr should help me do this, but I can't
    > get it to work.
    >
    > Any ideas??


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
HTML5 Development Center
 
 
FAQ
Latest Articles
Java
.NET
XML
Database
Enterprise
Questions? Contact us.
C++
Web Development
Wireless
Latest Tips
Open Source


   Development Centers

   -- Android Development Center
   -- Cloud Development Project Center
   -- HTML5 Development Center
   -- Windows Mobile Development Center