C++: unpack the data back again

Question

I'm packing my string with this function:

std::vector<char> pack(const std::string& str) { const uint32_t sz = str.size(); const uint32_t n_sz = htonl(sz); std::vector<char> result(sizeof(sz) + sz); memcpy(result.data(), &n_sz, sizeof(n_sz)); memcpy(result.data() + sizeof(sz), str.data(), sz); return result; }

How can i unpack it again so...i get the original string back?

I tried to do:

 int len; len = ntohl(ourbuffer.size()); char* string = ( char* )malloc(sizeof (char) * (len + 1)); string[len] = '\0';

becouse i know the function pack is using big endian. But that did not work. Can someone please show how to to unpack again??

melpomene · Accepted Answer · 2018-03-14 07:59:42Z

1

uint32_t n_sz; memcpy(&n_sz, ourbuffer.data(), sizeof n_sz); const uint32_t sz = ntohl(n_sz); std::string str(ourbuffer.data() + sizeof n_sz, sz);

answered Mar 14, 2018 at 7:59

melpomene

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Hans Hansen Over a year ago

Hmm that give a lot sense and works, thank you and to everyone else who helped me!

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