首先我问了这个Running a function on the main thread from a boost thread and passing parameters to that function
所以现在我正在尝试这个：
以下是一个控制台c ++项目，我完美地模拟了我的大项目
TestServicePost.cpp
#include "stdafx.h"
#include "SomeClass.h"
int _tmain(int argc, _TCHAR* argv[])
{
SomeClass* s = new SomeClass();
while(true)
{
s->update();
}
return 0;
}
SomeClass.h
#include <boost/thread.hpp>
#include <boost/asio.hpp>
#include <queue>
class ServiceNote
{
public:
std::string getType()
{
std::stringstream typeSS;
typeSS << "LamasaTech.MultiWall.PostNote." << (NoteType.compare("Normal") == 0 ? "Node" : "Header") << "." << Shape << "." << Colour;
return typeSS.str();
}
int Action;
int CNoteId;
std::string Colour;
int NoteId;
std::string NoteType;
int SessionId;
std::string Shape;
std::string Style;
std::string Text;
int X;
int Y;
};
class SomeClass
{
public:
SomeClass();
~SomeClass();
void update();
private:
std::queue<ServiceNote> pendingNotes;
void addToQueue(ServiceNote sn);
void pollService(boost::asio::io_service* svc);
int getMessage(boost::asio::io_service* svc, std::string sessionId, int messageId);
boost::thread servicePoller;
};
SomeClass.cpp
#include "stdafx.h"
#include "SomeClass.h"
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/asio/signal_set.hpp>
#define POLL_SERVICE = 0;
#define POLLING_WAIT_TIME 1000
#define SAVE_SESSION_EVERY 1800000
SomeClass::SomeClass()
{
boost::asio::io_service io_servicePoller;
io_servicePoller.run();
servicePoller = boost::thread(boost::bind(&SomeClass::pollService, this, &io_servicePoller));
/*boost::asio::io_service io_sessionSaver;
boost::asio::signal_set signalsSaver(io_sessionSaver, SIGINT, SIGTERM);
signalsSaver.async_wait( boost::bind(&boost::asio::io_service::stop, &io_sessionSaver));
sessionSaver = boost::thread(&SomeClass::saveSessionEvery, io_sessionSaver);*/
}
SomeClass::~SomeClass()
{
}
void SomeClass::update()
{
while(!pendingNotes.empty())
{
ServiceNote sn = pendingNotes.front();
pendingNotes.pop();
}
}
void SomeClass::addToQueue(ServiceNote sn)
{
pendingNotes.push(sn);
}
void SomeClass::pollService(boost::asio::io_service* svc)
{
int messageId = 1;
while(true)
{
if(boost::this_thread::interruption_enabled() && boost::this_thread::interruption_requested())
return;
int currentId = messageId;
messageId = getMessage(svc, "49", messageId);
if(currentId == messageId)
boost::this_thread::sleep(boost::posix_time::milliseconds(POLLING_WAIT_TIME));
}
}
int SomeClass::getMessage(boost::asio::io_service* svc, std::string sessionId, int messageId)
{
try
{
boost::asio::io_service io_service;
// Get a list of endpoints corresponding to the server name.
boost::asio::ip::tcp::resolver resolver(io_service);
boost::asio::ip::tcp::resolver::query query("mw.rombus.com", "http");
boost::asio::ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
// Try each endpoint until we successfully establish a connection.
boost::asio::ip::tcp::socket socket(io_service);
boost::asio::connect(socket, endpoint_iterator);
// Form the request. We specify the "Connection: close" header so that the
// server will close the socket after transmitting the response. This will
// allow us to treat all data up until the EOF as the content.
boost::asio::streambuf request;
std::ostream request_stream(&request);
request_stream << "GET " "/Service.svc/message/" << sessionId << "/" << messageId << " HTTP/1.0\r\n";
request_stream << "Host: " << "mw.rombus.com" << "\r\n";
request_stream << "Accept: */*\r\n";
request_stream << "Connection: close\r\n\r\n";
// Send the request.
boost::asio::write(socket, request);
// Read the response status line. The response streambuf will automatically
// grow to accommodate the entire line. The growth may be limited by passing
// a maximum size to the streambuf constructor.
boost::asio::streambuf response;
boost::asio::read_until(socket, response, "\r\n");
// Check that response is OK.
std::istream response_stream(&response);
std::string http_version;
response_stream >> http_version;
unsigned int status_code;
response_stream >> status_code;
std::string status_message;
std::getline(response_stream, status_message);
if (!response_stream || http_version.substr(0, 5) != "HTTP/")
{
//std::cout << "Invalid response\n";
return messageId;
}
if (status_code != 200)
{
//std::cout << "Response returned with status code " << status_code << "\n";
return messageId;
}
// Read the response headers, which are terminated by a blank line.
boost::asio::read_until(socket, response, "\r\n\r\n");
// Process the response headers.
std::string header;
std::string fullHeader = "";
while (std::getline(response_stream, header) && header != "\r")
fullHeader.append(header).append("\n");
// Write whatever content we already have to output.
std::string fullResponse = "";
if (response.size() > 0)
{
std::stringstream ss;
ss << &response;
fullResponse = ss.str();
try
{
boost::property_tree::ptree pt;
boost::property_tree::read_json(ss, pt);
ServiceNote sn;
sn.Action = pt.get<int>("Action");
sn.CNoteId = pt.get<int>("CNoteId");
sn.Colour = pt.get<std::string>("Colour");
sn.NoteId = pt.get<int>("NoteId");
sn.NoteType = pt.get<std::string>("NoteType");
sn.SessionId = pt.get<int>("SessionId");
sn.Shape = pt.get<std::string>("Shape");
sn.Style = pt.get<std::string>("Style");
sn.Text = pt.get<std::string>("Text");
sn.X = pt.get<int>("X");
sn.Y = pt.get<int>("Y");
svc->post(boost::bind(&SomeClass::addToQueue, this, sn));
//pendingNotes.push(sn);
}
catch (std::exception const& e)
{
std::string test = e.what();
//std::cerr << e.what() << std::endl;
}
messageId++;
}
// Read until EOF, writing data to output as we go.
std::string fullSth = "";
boost::system::error_code error;
while (boost::asio::read(socket, response,
boost::asio::transfer_at_least(1), error))
{
std::ostringstream ss;
ss << &response;
fullSth = ss.str();
}
if (error != boost::asio::error::eof)
throw boost::system::system_error(error);
}
catch (std::exception& e)
{
std::string test = e.what();
std::cout << "Exception: " << e.what() << "\n";
}
return messageId;
}
但我得到Unhandled exception at 0x771215de in TestServicePost.exe: 0xC0000005: Access violation writing location 0xcccccce4.，就在这一行执行之后：
svc->post(boost::bind(&SomeClass::addToQueue, this, sn));
我无法将io_service定义为类成员，因此我可以在析构函数~SomeClass()中使用它，也非常感谢这方面的帮助
如果io_service.post对我来说不是最好的解决方案，请推荐一些东西，因为你可以看到我有一个构造函数，析构函数和一个更新方法，每个tick都调用，我尝试使用这个和队列，但它不是' t线程安全，是否有一个易于使用的线程安全FIFO？
答案 0 :(得分：4)
在SomeClass构造函数中，您实际执行以下操作：
io_service实例。 run()成员函数which returns immediately，因为io_service无效。 这当然行不通。
请注意io_service::run()是一种“消息循环”，因此它应该阻止调用线程。不要在对象构造函数中调用它。
答案 1 :(得分：2)
我想出了如何将io_service声明为类成员：
boost::shared_ptr< boost::asio::io_service > io_servicePoller;
并在构造函数中执行了以下操作：
SomeClass::SomeClass()
{
boost::shared_ptr< boost::asio::io_service > io_service(
new boost::asio::io_service
);
io_servicePoller = io_service;
servicePoller = boost::thread(boost::bind(&SomeClass::pollService, this, io_servicePoller));
}
一些清理
SomeClass::~SomeClass()
{
servicePoller.interrupt();
io_servicePoller->stop();
servicePoller.join();
}
并且在update i中调用了run，它将东西添加到队列中，然后在while循环中读取它们
void SomeClass::update()
{
io_servicePoller->run();
io_servicePoller->reset();
while(!pendingNotes.empty())
{
ServiceNote sn = pendingNotes.front();
pendingNotes.pop();
}
}
并将我的会员签名更改为void SomeClass::pollService(boost::shared_ptr< boost::asio::io_service > svc)
所以会发生什么：
感谢Igor R.我不能没有他
还有http://www.gamedev.net/blog/950/entry-2249317-a-guide-to-getting-started-with-boostasio?pg=4我得到了如何制作共享指针