我試圖異步使用Boost.Asio解析ftp主機。異步解決與Boost.Asio
這裏是我試過到目前爲止:
#include <iostream>
#include <string>
#include <boost/asio.hpp>
#include <boost/bind.hpp>
using boost::asio::ip::tcp;
class FtpSession {
public:
void Connect(std::string& host) {
boost::asio::io_service io_service;
tcp::resolver resolver(io_service);
tcp::resolver::query query(host, "ftp");
resolver.async_resolve(query,
boost::bind(&FtpSession::OnResolve, this,
boost::asio::placeholders::error,
boost::asio::placeholders::iterator));
}
private:
void OnResolve(const boost::system::error_code& err, tcp::resolver::iterator endpoint_iterator) {
if (!err)
{
std::cout << "resolved!";
}
else
{
std::cout << "error.";
}
}
};
int main() {
FtpSession session;
std::string host("ftp.remotesensing.org");
session.Connect(host);
return 0;
}
但由於某些原因,當我執行它,它只是不顯示任何信息:在
[email protected]:~/Desktop$ g++ -o test -lboost_system test.cc
[email protected]:~/Desktop$ ./test
[email protected]:~/Desktop$
任何錯誤或警告彙編雖然。
我該如何解決這個問題?
謝謝! `io_service.run()`在當前線程上執行此操作嗎?如果是的話,有沒有辦法做到這一點非阻塞? – 2011-01-13 10:20:08