c++ - Boost Process 库 asynch_read 处理程序未调用

Question

我正在尝试使用 boost process (0.5) 库。在 asych_io.cpp 示例中，读取处理程序甚至没有被调用一次。即使在调用 io_service.run() 之后也是如此。
我正在使用 Linux。

#include <boost/process.hpp>
#include <boost/iostreams/device/file_descriptor.hpp>
#include <boost/asio.hpp>
#include <boost/array.hpp>
#include <string>

using namespace boost::process;
using namespace boost::process::initializers;
using namespace boost::iostreams;

boost::process::pipe create_async_pipe()
{
    return create_pipe();
}

int main()
{

boost::process::pipe p = create_async_pipe();
file_descriptor_sink sink(p.sink, close_handle);
child c = execute(
    run_exe(search_path("nasm")),
        set_cmd_line("nasm -v"),
    bind_stdout(sink)
);

file_descriptor_source source(p.source, close_handle);

typedef boost::asio::posix::stream_descriptor pipe_end;

boost::asio::io_service io_service;
pipe_end pend(io_service,p.source);

boost::array<char, 4096> buffer;
boost::asio::async_read(pend, boost::asio::buffer(buffer),
    [&](const boost::system::error_code&, std::size_t bytes_transferred){
          std::cout << std::string(buffer.data(), bytes_transferred) << std::flush; 
    });

    io_service.run();
}

Answer 1

更换后

boost::asio::async_read(pend...

与

pend.async_read_some(...

这对我有用。