asio device

1. Implement multi-Threading method:It's actually multiple threads calling Io_service::run at the same timefor (int i = 0; I! = m_nthreads; ++i){Boost::shared_ptrBoost::bind (boost::asio::io_service::run,m_ioservice));M_listthread.push_back (PTH);}2, multi-threaded scheduling situation:ASIO specifies that the event completion processor can only be called in a thread that calls Io_service::run.Note: The event completion processor is your async_accept,

Boost. Asio c ++ network programming translation (26), boost. asio Network ProgrammingBoost. Asio-Other Features This chapter describes some features that Boost. Asio is not so well known. Standard stream and streambuf objects are sometimes more difficult to use, but as you can see, they also have their benefits. Final

1. Overview Generally, most of the types we create for receiving errors are declared as follows: boost::system::error_code error We use this type to accept Errors generated in functions, such: socket.connect(endpoint, error); If the connection fails, the error type will be saved to error. For example, if the connection to the host fails, this error may be returned. boost::asio::error::host_not_found; If (error) throws an exception after detecting the

Boost. Asio c ++ network programming translation (21), boost. asio Network ProgrammingThe author of synchronous VS asynchronous Boost. Asio made a very amazing job: it allows you to freely choose between synchronous and asynchronous, so as to better adapt to your application. In the previous sections, we learned the frameworks of each type of application, such as

Boost. Asio c ++ network programming translation (20), boost. asio Network ProgrammingThe Asynchronous Server chart is quite complex. From Boost. Asio, You can see four arrows pointing to on_accept, on_read, on_write, and on_check_ping. That means you never know which asynchronous call is the next complete call, but you can be sure that it is one of the four oper

Boost. Asio c ++ network programming translation (24), boost. asio Network ProgrammingMultithreading In the Asynchronous Server I have displayed on the client and the server in Chapter 4th. The Asynchronous Server is single-threaded, and all things happen in main: int main() { talk_to_client::ptr client = talk_to_client::new_(); acc.async_accept(client->sock(), boost::bind(handle_ accept,client,

who performs real operations (such as reading and writing). In the reactor mode, the application needs to read or write data by itself. In the proactor mode, the application does not need to perform the actual read/write process. The operating system reads the buffer or writes the buffer to the real I/O device. The application only needs to read or write data from the buffer. In proactor mode, the user initiates an asynchronous operation and then ret

used at the operating system level. The most significant difference is that, at TCP distance, the Reactor will notify the upper-layer application when the kernel receives TCP data, the following code extracts data from the kernel and calls the processing function for processing (when and how ). After receiving data from TCP, The Proactor will copy the data to the specified space by the kernel, and then immediately call the registered callback function for processing. It seems that Proactor is

Boost::asio can perform synchronous or asynchronous operations on I/O objects such as sockets, it is necessary to understand Boost::asio, your programs, and the process of their interaction before using Boost::asio. As an example of a bootstrap, we think about what happens when a socket performs a connection operation, and we start with a synchronous example wher

boost/asio库中封装了很多关于scoket的函数，当然，asio库还包含很多底层的库。我们可以用socket编写一个基于UDP协议的黑框通讯程序。要想使用asio里面的函数，大多都需要先创建一个io_service对象，然后通过这个serveice来构造不同的对象，所以第一步，我们得创建两个对象： boost::asio::io_service io_service; boost::asio::ip::udp::socket udp_socket(io_service);这里唯一需要注意的就是命名空间的使用，两处不同。创建了

////Async_client.cpp// ~~~~~~~~~~~~~~~~//an asynchronous HTTP client that is very similar to synchronization. The difference is the last point where the loop is synchronized//Copyright (c) 2003-2013 Christopher M. Kohlhoff (Chris at kohlhoff dot com)////distributed under the Boost software License, Version 1.0. (See accompanying//file license_1_0.txt or copy atHttp://www.boost.org/LICENSE_1_0.txt)//#include#include#include#includestring>#include#includeusingboost::

1 Introduction Asio 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 Asio 2.1 Downloads Asio Library is divided into Boost version and non-boost version, please download it on the website. 2.2 Configuration 1) using Qt 5.9.1, i

//Daemon.cpp//This example shows a fork system call that combines the ASIO and POSIX standard systems to produce a daemon. //time server? //Copyright (c) 2003-2014 Christopher M. Kohlhoff (Chris at kohlhoff dot com)////distributed under the Boost software License, Version 1.0. (See accompanying//file license_1_0.txt or copy atHttp://www.boost.org/LICENSE_1_0.txt)//#include#include#include#include#include#include#include#include#includeusingboost::

Create a buffer In io operations, read and write data mostly in a buffer zone. In the asio framework, you can use the asio: buffer function to create a buffer zone to provide data read and write. The buffer function does not apply for memory, but provides an encapsulation of the existing memory. Char d1 [128];Size_t bytes_transferred = sock. receive (asio: buffe

TCP: resolver is generally used in combination with TCP: resolver: Query. You can use the word "query" to obtain the corresponding information of the socket, generally, we care about the address and port of socket. through TCP: resolver, it is easy to set and query. It uses query to set the IP address in string format, such as 192.168.0.200 or the Host Name HTTP: // The localhost and port "8080" are converted into the internal representation format of the socket, so that we can directly use the

2 feet and 3 feet short before running the program , so that you can either send data or collect data4 Virtual serial PortIf you use a notebook, there is generally no serial port, then there are two options:First, the use of USB to serial data cable, and install the corresponding driver, you can and with the serial port of the device to communicate;Second, use the virtual serial port software to create a virtual serial port, for example, Configure vi

(Original) Open the fog to see the moon-analyze the proactor mode in asio (2), asioproactor In the previous blog, we mentioned that asynchronous requests are forwarded from the upper layer to the win_iocp_socket_service object at the bottom of the service layer, which forwards requests to the Operating System (Calling windows APIs ), how does the operating system return the result to the application after processing the asynchronous request? Here, it

# Pragma once # Include # Include # Include Using boost: asio: ip: tcp; Class CAsioClient{Public:CAsioClient (boost: asio: io_service io_service, tcp: endpoint endpoint): Socket (io_service){Socket. async_connect (endpoint,Boost: bind ( CAsioClient: handle_connect, this, boost: asio: placeholders: error));Memset (getBuffer, 0, sizeof (getBuffer ));} Virtual ~

BOOST. Asio, boost ======================================Copyright Notice====================================== Copyright statement: the original article declined to repost what it said, and despised those crawlers who ignored the copyright to capture blog posts at will. I wish you a very happy early time. Please contact me through "contact email (wlsandwho@foxmail.com)" in the announcement on the right Do not use academic references. Do not use for c

# Include Ctime > # Include Iostream > # Include Boost / Bind. HPP > # Include Boost / Shared_ptr.hpp > # Include Boost / Enable_shared_from_this.hpp > # Include Boost / ASIO. HPP > UsingBoost: ASIO: IP: TCP; STD ::StringMake_daytime_string (){UsingNamespaceSTD;Time_t now=Time (0);ReturnCtime (Now );} /* class derived from enable_sha