![]() (Be cautioned, however, that not all that has been packed together can be neatly unpacked - a very common experience as seasoned travellers are likely to confirm.) unpack is the reverse process, deriving some values from the contents of a string of bytes. The pack function converts values to a byte sequence containing representations according to a given specification, the so-called "template" argument. ![]() In Perl, you just can't access memory at random, but the structural and representational conversion provided by pack and unpack is an excellent alternative. Using the address and the size, you may access the storage to your heart's content. In C, for instance, you can take the address of some variable, and the sizeof operator tells you how many bytes are allocated to the variable. Most programming languages don't shelter the memory where variables are stored. This tutorial will demystify them for you. ![]() Unfortunately, they're also two of the most misunderstood and most often overlooked functions that Perl provides. Pack and unpack are two functions for transforming data according to a user-defined template, between the guarded way Perl stores values and some well-defined representation as might be required in the environment of a Perl program. Perlpacktut - tutorial on pack and unpack #DESCRIPTION ![]()
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