Retrieving Bytes data from boost::asio: array

Question

I am trying to retrieve data from boost array with Bytes data which should at the end be 2 double. I don't why but I can't make the conversion of the buffer to a readable format here is my attempt :

boost::array<void*, 1024> arr;
boost::system::error_code error_2;
socket_2.read_some(boost::asio::buffer(arr), error_2);  
for (int k = 0; k < 32; k++) { std::cout << arr[k]; }

I don't understand how to retrieve the data from arr, memcpy is not accepted for instance.

Please read the tour to the end, and inform yourself at our help center what and how you can ask here! — πάντα ῥεῖ
– πάντα ῥεῖ, Commented Sep 19, 2022 at 16:59
You are passing an array of void pointers and expecting some kind of readable buffer in return? — Mikel F
– Mikel F, Commented Sep 19, 2022 at 16:59

sehe · Accepted Answer · 2022-09-19 17:06:09Z

1

Effectively, whatever you do will amount to memcpy. But you can make things more elegant:

boost::array<double, 4096 / sizeof(double)> arr;

boost::system::error_code ec;

size_t n = s.read_some(asio::buffer(arr), ec);

for (size_t i = 0; i < (n / sizeof(double)); ++i) {
    std::cout << arr[i];
}

If you already have a raw buffer, consider asio::buffer_cast<>

answered Sep 19, 2022 at 17:06

sehe

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1 Comment

Tristan Over a year ago

Hi, thank you, it works, I retrieve the info, thank you, I am sorry for the misteake, I was not able to identify what was wrong..

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