To further clarify, the reason why $Buffer = '/0'; is still wrong:

First of all, you need to understand the difference between single quotes and double quotes in Perl. If you wanted to populate the buffer with a single null character, you would say $Buffer = "\0";. Note the double quotes and the backslash instead of forward slash.

Second, you don't want to populate a buffer with a null character. In Perl this is not necessary. Perl takes care of allocating memory for strings for you. This was mentioned by Corion but you seem to have missed that part of the reply.