将 boost 序列化对象的 asio：：streambuf 表示转换为 Beast 的 DynamicBody req.body()

Convert boost serialized object's asio::streambuf representation into Beast's DynamicBody req.body()

本文关键字：DynamicBody Beast req body 表示 序列化 boost 对象 asio streambuf 转换      更新时间：2023-10-16
// Serialize using boost serialization        
boost::asio::streambuf binary_buffer;
boost::archive::binary_oarchive archive(binary_buffer);
archive << world_map; 
//beast::buffers_adaptor<boost::asio::streambuf>(binary_buffer);
req.body().data() = beast::buffers_adaptor<boost::asio::streambuf>(binary_buffer);

我有这段代码，我尝试将 streambuf 转换为 req.body((，以便我可以将其发送到服务器。 浏览示例，我无法弄清楚正确的转换是什么。 buffers_adaptor似乎接受了一个可变缓冲区，而不是由asio：：streambuf产生的ConstBuffer。

我该如何解决这个问题？

有了dynamic_body，body(( 实际上是一个multi_buffer。

所以你需要复制到那个：

req.body().prepare(binary_buffer.size());
req.body().commit(binary_buffer.size());
auto n = asio::buffer_copy(req.body().data(), binary_buffer.data());

例：

req.body().prepare(binary_buffer.size());
req.body().commit(binary_buffer.size());
auto n = asio::buffer_copy(req.body().data(), binary_buffer.data());
req.target("http://example.com");
req.method(http::verb::post);
req.set(http::field::host, "example.com");
req.content_length(n);
std::cout << req << std::endl;

指纹

POST http://example.com HTTP/1.1
Host: example.coml
Content-Length: 41
22 serialization::archive 18 9 world_map

简化

直接序列化到正文缓冲区中会更便宜。您可以使用Boost Iostreams，例如vector_body：

住在科里鲁

#include <boost/asio/streambuf.hpp>
#include <boost/beast.hpp>
#include <boost/beast/http.hpp>
namespace asio = boost::asio;
namespace beast = boost::beast;
namespace http = beast::http;
#include <boost/iostreams/device/back_inserter.hpp>
#include <boost/iostreams/stream_buffer.hpp>
#include <boost/serialization/serialization.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <iostream>
int main()  {
http::request<http::vector_body<char> > req;
{
namespace io = boost::iostreams;
using D = io::back_insert_device<std::vector<char> >;
io::stream_buffer<D> sb(req.body());
{
std::ostream os(&sb);
std::string world_map = "world_map"; // for demo
boost::archive::text_oarchive archive(os);
archive << world_map;
}
}
req.target("http://example.com");
req.method(http::verb::post);
req.set(http::field::host, "example.com");
req.content_length(req.body().size());
std::cout << req << std::endl;
}

指纹

POST http://example.com HTTP/1.1
Host: example.com
Content-Length: 41
22 serialization::archive 18 9 world_map
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