[英]Boost asio, async_read and acync_write not calling callbacks
我正在封裝boost-asio
套接字,但是我遇到了問題,但是async_read
和async_write
都沒有調用它們的回調函數,我也不明白為什么。
我試過使用async_read_some
但是有同樣的問題。
這是我到目前為止編寫的代碼
#include <iostream>
#include "socket.hpp"
Socket::Socket()
{
boost::asio::ip::tcp::endpoint ep_tmp(boost::asio::ip::tcp::v4(), 4242);
endpoint = ep_tmp;
acceptor = new boost::asio::ip::tcp::acceptor(ios, endpoint);
tcp_socket = new boost::asio::ip::tcp::socket(ios);
acceptor->listen();
}
Socket::~Socket()
{
delete(acceptor);
delete(tcp_socket);
}
void Socket::get_connection()
{
acceptor->async_accept(*tcp_socket, [](const boost::system::error_code &ec)
{
std::cout << "Connection received." << std::endl;
if (ec)
std::cout << "Error " << ec << std::endl;
});
this->exec();
}
void Socket::send(std::string &message)
{
async_write(*tcp_socket, boost::asio::buffer(message),
[](const boost::system::error_code &ec,
std::size_t bytes_transferred)
{
std::cout << "Sending datas." << std::endl;
if (ec)
std::cout << "Error " << ec << std::endl;
else
std::cout << bytes_transferred << " bytes transferred." << std::endl;
});
}
void Socket::receive(void)
{
char *buf;
buf = (char *)malloc(sizeof(char) * 50);
buf = (char *)memset(buf, 0, 50);
async_read(*tcp_socket, boost::asio::buffer(buf, 50),
[](const boost::system::error_code &ec,
std::size_t bytes_transferred)
{
std::cout << "Receiving datas." << std::endl;
if (ec)
std::cout << "Error " << ec << std::endl;
else
std::cout << bytes_transferred
<< " bytes transferred." << std::endl;
});
}
void Socket::exec(void)
{
ios.run();
}
int main()
{
Socket serv;
std::string data_test;
data_test = "Test\n";
serv.get_connection();
serv.send(data_test);
serv.exec();
serv.receive();
serv.exec();
return (0);
}
在我找到不使用C的方法之前, malloc
位是臨時的。
如果有人可以啟發我,我將非常感謝
您必須先調用io_service::reset
,然后再調用io_service::run
。 您可能想改用同步API,因為您當前的方法絕對違背了異步性的目的。
我和yuri在一起:除非您知道自己在做什么,否則請選擇非異步。
它可能看起來像這樣: http : //coliru.stacked-crooked.com/a/523a7828a9aee4b2
#include <boost/asio.hpp>
#include <iostream>
namespace ba = boost::asio;
using ba::ip::tcp;
class Socket {
public:
Socket() { acceptor.listen(); }
void get_connection();
void exec();
void send(std::string const &message);
void receive(void);
private:
ba::io_service ios;
tcp::endpoint endpoint{ tcp::v4(), 4242 };
tcp::acceptor acceptor{ ios, endpoint };
tcp::socket tcp_socket{ ios };
};
void Socket::get_connection() {
acceptor.accept(tcp_socket);
std::cout << "Connection received.\n";
}
void Socket::send(std::string const &message) {
std::cout << "Sending datas.\n";
auto bytes_transferred = ba::write(tcp_socket, ba::buffer(message));
std::cout << bytes_transferred << " bytes transferred.\n";
}
void Socket::receive(void) {
std::cout << "Receiving datas.\n";
char buf[50] = { 0 };
auto bytes_transferred = ba::read(tcp_socket, ba::buffer(buf));
std::cout << bytes_transferred << " bytes transferred.\n";
}
int main() {
Socket serv;
serv.get_connection();
serv.send("Test\n");
serv.receive();
}
如果要異步行為,則必須管理每個特定於緩沖區/連接的資源的生存期。 有很多示例,例如在文檔中或此處: http : //coliru.stacked-crooked.com/a/95e2000e49b4db1d
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