C++ sockets, how to send hexadecimal with asio?

I need help, I’m trying to send this data in hexadeciamal, but always the packet_byte.size() and date() says: the express needs to have type of calsse, but has the type "char".
I dont now what i need do, if anyone can help me.and if you can indicate what to study to understand this error Thank you.

#include <iostream>
#define ASIO_STANDALONE
#ifdef _WIN32
#define _WIN32_WINNT 0x0A00
#endif 
#include <asio.hpp>
#include <asio/ts/buffer.hpp>
#include <asio/ts/internet.hpp>





int main() {
    asio::error_code ec; //pega erros especificos

    //Cria o "context" 
    asio::io_context context;

    //Pega o endereço no qual estamos conectando1
    asio::ip::tcp::endpoint endpoint(asio::ip::make_address("ip", ec), 15559);
    
    //Cria o socket, o context ira entregar a implementaçao
    asio::ip::tcp::socket socket(context);

    //Diz ao socket para tentar se conectar
    socket.connect(endpoint, ec);

    if (!ec) {
        std::cout << "Conectado!" << std::endl; 
    }

    else {
        std::cout << "Falha de conecxao com o endereço: \n" << ec.message()/*pega mensagem associada ao erro */ << std::endl;
    }

    //Verifia se esta conectado
    if (socket.is_open()) { 

        const unsigned char packet_bytes [] = {
                "0x1e, 0x00, 0xe0, 0x55, 0xc0, 0x52, 0x09, 0x00,"
                "0x41, 0x00, 0x73, 0x00, 0x70, 0x00, 0x70, 0x00,"
                "0x69, 0x00, 0x65, 0x00, 0x72, 0x00, 0x72, 0x00,"
                "0x00, 0x00, 0x08, 0x9b, 0x95, 0x01"
         };
        


        //Se conexçao for True, escreve:
        //asio::buffer e um container, contendo bytes da string e sizer.
        socket.write_some(asio::buffer(packet_bytes.data(), packet_bytes.size()), ec);
        
        //Estava dando erro pelo tempo de resposta, programa indo mais rapido que a resposta.       
        socket.wait(socket.wait_read);
        
        size_t bytes = socket.available();
        std::cout << "Bytes Available: " << bytes << std::endl;

        if (bytes > 0) {
            //adiciona dados recebidos em um vector
            std::vector<char> vBuffer(bytes);
            socket.read_some(asio::buffer(vBuffer.data(), vBuffer.size()), ec);
            // 
            for (auto c : vBuffer) {
                std::cout << c;
            }
        }

        
    }
    system("pause");
    return 0;

}```

>Solution :

Your packet_bytes is a plain character array, it doesn’t have data and size member function. Hence it is not possible to call packet_bytes.data() and packet_byte.size() on character array.

To create a asio::buffer from an array of characters, you need to pass the character array and its length to asio::buffer.

Please update your code as follows, then it should compile fine.

socket.write_some(asio::buffer(packet_bytes, sizeof(packet_bytes)), ec);