asio interface

1 IntroductionAsio is a cross-platform C + + library that is commonly used for network programming, low-level I/O programming, and so on (low-level I/O), with the following structural framework:2 Using Asio2.1 DownloadsAsio can be divided into Boost version and Non-boost version, the latter is: http://think-async.com/After the download is complete, unzip directly to the appropriate location.2.2 Configuration1) using Qt 5.9.1, in its. Pro project file, add the following configuration: note Asio_s

The epoll package of boost adopts the so-called leader followers mode. We know that epoll_wait cannot be called in multiple threads; To simulate the proactor mode in Linux, Asio uses the data structure at the application layer to simulate the complete packet queue implemented by iocp in windows, And Io request packets; To simulate multiple iocp worker threads calling getqueuedcompletedstatus, Since epoll_wait cannot be concurrently executed, the

Http://www.gamedev.net/blog/950/entry-2249317-a-guide-to-getting-started-with-boostasio?pg=65. Error HandlingThe next topic we need to pay attention to is error handling. In other words, what happens when a function throws an exceptionBoost::asio gives the user two options to handle. Errors are propagated through handler, indicating where the thread calls the run or poll series functions. The user can handle the state thrown through the exception or r

Simplify the design of ASIO chat code removal roomAll connected clients are under the same roomChat message using the boost-from-Sample header file#pragma once#include MyChat.cpp: Defines the entry point of the console application. #include "stdafx.h" #include 　　Boost ASIO network chat code Modification Learning

This article uses a sample code to illustrate how to use the boost ASIO for synchronous communication. #include Boost ASIO learning note [1]-synchronous communication

Namespace {// strand provides serial execution to ensure thread security. The post or dispatch method will not be executed concurrently. // io_service cannot guarantee thread security. Boost: ASIO: io_service m_service; Boost: ASIO: strand m_strand (m_service); Boost: mutex m_mutex; void print (int id) {// boost: mutex: scoped_lock lock (m_mutex); static int COUNT = 0; print_debug ("ID:" Execution result o

Now we use newlisp to write a tcp client for testing.Program: Chenshu @ chenshu-Beijing :~ $ Newlispnewlisp v.10.4.5 64-bit on Linux IPv4/6 UTF-8 libffi, execute 'newlisp-H' for more info.> (set 'socket (net-Connect "localhost" 8888) 3> (net-send socket "") The aboveCodeExplanation: 1. (net-connect...) is used to connect to the local port 8888. The returned socket file is assigned to the socket variable. 2. (net-send can send a string "a" to the connection represented by socket"

Simple server built based on boost: asio Encapsulation After one day of simple learning, I tried to write a simple server by myself, which can implement the following three callback functions: onConnect onMessage onClose Paste the code below 1. BaseServer abstract class BaseServer. h /* Name: BaseServeruse: the basest serverauthor: hezijian (hezijian22@163.com) */# ifdef _ MSC_VER # define _ WIN32_WINNT 0x0501 # endif # ifndef _ BASE_SERVER_H _ # def

The io_service: Work class can enable the io_service: Run function to not return the result when no task exists until the work object is destroyed. Void test_asio_nowork () {boost: ASIO: io_service Ios; print_debug ("iOS before"); IOs. run (); print_debug ("iOS end");} void test_asio_work () {boost: ASIO: io_service Ios; // Add a work object boost: ASIO :: io_se

: asio provides this method, allowing shared_ptr to quickly manage your class. However, this causes a problem. When your class is derived from enable_shared_from_this, you cannot use shared_from_this () in the class member function to obtain class pointers. The following is an error: class B {public: B(): x_(4) { cout p(this); cout x(new B); x->f(); return 0;} Output:B: B ()4B ::~ B ()B ::~ B ()The same object is analyzed twice, causing cat

Recently, I have been studying network-related things and found that my previous understanding of UDP is weak. I am too dependent on TCP and even forget the existence of another UDP. As a result, I randomly searched the UDP socket programming code and materials on the Internet, and found that there was still a connect in the programming example written by someone. I was speechless. Compared with TCP, UDP is an unreliable transmission protocol. When the network environment is poor, using TCP is u

Only by looking at the boost source code can we figure out what happened. First, I write data into the vector, and then use boost: ASIO: buffer to construct the vector into a mutable_buffer_1 object. Refer to the document's heavy duty form: http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/reference/buffer/overload24.html buffer (24 of 28 overloads)Create a new modifiable buffer that represents the given POD vector.template Note that the last

From the example in the previous section, we can get an inference. If no asynchronous I/O operations are initiated in the connection object, the connection object will be destroyed after the last callback function is executed. I need to prove this inference. If startwork initiates an asynchronous call to wait for data after the connection is established, the connection object will not be destroyed during the waiting period. Once the waiting data arrives, the connection object will be destroy

I didn't know what was going on at first, but luckily I had a message printed at each class's destructor.This time I found a tcp_connection (that is, a custom connection Class) to be refactored at the end.So there may be a problem here.Since tcp_connection is derived from the boost::enable_shared_from_thisSpeculation may be that some resources need to be released in advance, without causing some data to be io_service when the resource is released.So I put this tcp_connection reset (like an activ

C + + Boost::asio programming-domain name resolution In network communication, we usually do not use the IP address directly, but instead use the domain name. At this time we need to use the Reslover class to obtain IP through the domain name, it can achieveURL resolution unrelated to the IP version. #include "stdafx.h" #include "boost/asio.hpp" #include "boost/shared_ptr.hpp" #include "boost/thread.hpp" #include After testing, the port can be fille

Today I would like to talk about how the network communication library in boost is designed and used, as it has been working with the network recently, and big data processing and machine learning are all inseparable from the final use of the network for on-line deployment. Let's look at all the source code first.#include This is the full source code for the service area.Data is the format of the message, translate_data the definition of the class, which can be serialized using boost. The entire

softwareThreads in the asynchronous service sideAsynchronous operationThe proxy implementation.Summarize.=======Sixth chapter: boost.asio-Other FeaturesSTD streams and STD buffer I/OBoost.asio and STL StreamsStreambuf classFree functions for handling Streambuf objectsCo-processSummarize======Seventh chapter: Boost.asio AdvancedAsio vs Boost.asioModeHandler Trace InformationExampleHandler trace FileSslWindows features for Boost.asioStream processingRandom storage processingObject handlingPOSIX f

http://www.gamedev.net/blog/950/entry-2249317-a-guide-to-getting-Started-with-boostasio?pg=76 TimersBoost::asio provides a Deadline_timer class to provide synchronous and asynchronous interfaces.The boost documentation provides a good set of examples.The first example is to create a timer that is 5 seconds apart.#include 　　If we want to create a flush timer. We set the Timer object to global, but mayCauses the shared object to be not thread-safe. Boos

The Asio (http://think-async.com) Official example gives a relatively preliminary log service, with the main code in BASIC_LOGGER.HPP, LOGGER_SERVICE.HPP, Logger_ Service.cpp these 3 files. Improvements (such as creating a separate directory for log files, formatting log file names, and each line of logs, creating new log files on a regular basis) can build a usable log system.A new logger class is inherited from Basic_loggerMake a slight modification

Since ASIO uses epoll as the network core, to understand epoll, let's take a look at how libev works. Compared with the huge boost dependency of ASIO, libev is compact, lightweight, and efficient. Column demo Client: #include "stdio.h"#include "stdlib.h"#include Echoserver. cpp Compile command: G ++-g-o echoserver-levechoserver. cpp It is not clear which static or dynamic library is connected to libe