asio | boost asio学习实践记录 | SDK library

 by   linghutf C++ Version: Current License: No License

kandi X-RAY | asio Summary

kandi X-RAY | asio Summary

asio is a C++ library typically used in Utilities, SDK applications. asio has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

boost asio学习实践记录
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            kandi-support Support

              asio has a low active ecosystem.
              It has 10 star(s) with 3 fork(s). There are 1 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              asio has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of asio is current.

            kandi-Quality Quality

              asio has no bugs reported.

            kandi-Security Security

              asio has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              asio does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              asio releases are not available. You will need to build from source code and install.
              Installation instructions are not available. Examples and code snippets are available.

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            asio Key Features

            No Key Features are available at this moment for asio.

            asio Examples and Code Snippets

            No Code Snippets are available at this moment for asio.

            Community Discussions

            QUESTION

            How to convert boost::asio::awaitable to std::future?
            Asked 2021-Jun-12 at 18:00

            I have a function that returns boost::asio::awaitable. What is the idiomatic way to convert this awaitable to std::future?

            ...

            ANSWER

            Answered 2021-Jun-12 at 18:00

            Before we get into the answer, be warned:

            You should not, under any circumstance, get() or wait() a future to a boost::asio::awaitable from the same thread as the executor that is running the coroutine.

            That being said.

            That third parameter to co_spawn(), the one almost every example blindly sets to the magic detached constant? Its role is to tell boost::asio what to do once the coroutine has finished. detached simply means "do nothing". So the canonical way to fulfil a future from an awaitable<> should be via that mechanism.

            Thankfully, asio already provides the use_future completion token. Pass that as the third parameter to co_spawn() and it will return a std::future<> of the matching return type.

            Source https://stackoverflow.com/questions/67908591

            QUESTION

            MONGODB-ORG not running on UBUNTU 20.04
            Asked 2021-Jun-04 at 06:00

            I used to have mongodb (the unofficial package) installed on Ubuntu 20.04. I decided to change to the official one.(version 4.4) First, both packages got confilcted, but after wiping the old one, the install succeeded.

            But, when I try to run the mongod service,it fails, and shows this:

            ...

            ANSWER

            Answered 2021-Jun-04 at 06:00

            I've found a related question where the same author found the solution, please click here to see:

            As a side note, if you have the same error, and provided solutions does not work, please, follow the link and try this answer,but paying special attention to remove both lib and log files created by mongodb,

            Source https://stackoverflow.com/questions/67831879

            QUESTION

            Why is axios ignoring the .then?
            Asked 2021-Jun-03 at 20:43

            I have the following unit test making a rest call, but everything after my axios.get isn't running.

            restCalls.spec.js:

            ...

            ANSWER

            Answered 2021-Jun-03 at 20:36

            The problem is your getData function returns undefined. Though starts an axios request in 'backround'. And your test case calls it and immediatelly proceeds to the next line (expect(login == true)).

            To fix it you should make the getData function return created by axios.get promise. And add await before getData call in test case to wait for it to finish.

            Source https://stackoverflow.com/questions/67828094

            QUESTION

            How can I properly receive data with a TCP Python socket until a delimiter is found?
            Asked 2021-Jun-03 at 18:10

            I am receiving data from a source (Twitch IRC) that does not specify the length of the data beforehand, and it never sends a consistent amount of data. This source uses "\r\n" as its delimiter, and I would like to receive data until this delimiter is found, stop receiving to process the received data and then continue receiving. I have tried a few solutions I came up with:

            ...

            ANSWER

            Answered 2021-Jun-03 at 18:10

            You can buffer the data and extract whole messages when the separator is found. Example:

            server.py

            Source https://stackoverflow.com/questions/67825653

            QUESTION

            error_category mismatch in asio when used across dlls
            Asked 2021-Jun-03 at 14:30

            I have a problem with handling asio::error_code values when they are received from another dll or executable. For instance, I may run an asynchronous operation with a handler:

            ...

            ANSWER

            Answered 2021-Jun-03 at 14:30

            This is what I meant with this comment

            though boost::system::system_error could invite issues back

            The trouble is, error categories are global singleton instances, with object identity (i.e. compared for equality by their address).

            You'r ending up with multiple instances in multiple modules. The usual solution is to

            • dynamically link to Boost System, so all libraries use the same copy (this does however sometimes run into initialization order issues)
            • if that doesn't solve it, make sure all modules actually load the same library (version?)
            • In recent boosts I think there's the option to build Boost System completely header-only. This may or may not involve new-fangled C++14 inline, I haven't checked.

            If all else fails, do your own translation. There's related issues that might give you ideas:

            Is it normal or expected to compare only errorCode.value() against enums?

            No it is not. According to some sources Boost as well as standard library promise to map generic error category to errc which is standard - so you could do that, but you still have to figure out whether that is the category, so doesn't help your scenario.

            Source https://stackoverflow.com/questions/67823057

            QUESTION

            Minimal awaitable example
            Asked 2021-Jun-01 at 15:54

            I wonder why the following programme crashes. How to use awaitable not with boost::asio::async_write/async_read functions.

            Let's see:

            ...

            ANSWER

            Answered 2021-Jun-01 at 15:54

            digging into the sources of boost::asio::awaitable, I figured out that I just should make use of co_return keyword. Surprisingly, it is not shipped with boost. It is enabled either by -fcoroutines flag or -std=c++20. Unexpectedly. Having said that, it is solved.

            Source https://stackoverflow.com/questions/67785374

            QUESTION

            Why Boost.Asio SSL request returns 405 Not Allowed?
            Asked 2021-May-30 at 18:53

            I am trying to send HTTPS request to a server and receive the page contents by only using Boost.Asio(not Network.Ts or Beast or others) by these code :

            ...

            ANSWER

            Answered 2021-May-30 at 18:53

            QUESTION

            Asio Bad File Descriptor only on some systems
            Asked 2021-May-29 at 23:52

            Recently I wrote a Discord-Bot in C++ with the sleepy-discord bot library. Now, the problem here is that when I run the bot it shows me the following errors:

            ...

            ANSWER

            Answered 2021-May-29 at 21:34

            The error triggers when you so s.remote_endpoint on a socket that is not connected/no longer connected.

            It would happen e.g. when you try to print the endpoint with the socket after an IO error. The usual way to work around that is to store a copy of the remote endpoint as soon as a connection is established, so you don't have to retrieve it when it's too late.

            On the question why it's happening on the particular VM, you have to shift focus to the root cause. It might be that accept is failing (possibly due to limits like number of filedescriptors, available memory, etc.)

            Source https://stackoverflow.com/questions/67754693

            QUESTION

            Streaming images with ZMQ, message_t allocation takes too much time
            Asked 2021-May-28 at 16:40

            I've been trying to find out how to stream images with zeromq (i'm using the cppzmq wrapper, but raw API answers are fine). Naively, I set up

            ...

            ANSWER

            Answered 2021-May-28 at 16:40

            Use zmq_msg_init_data

            http://api.zeromq.org/master:zmq-msg-init-data

            You can provide the memory pointer/size of your already allocated memory and zeromq will take ownership (skipping the extra allocation). Once its been processed and is no longer needed it will call the associated free function where your own code can clean up.

            I have used this approach in the past with a memory pool/ circular buffer and it worked well.

            Source https://stackoverflow.com/questions/67676691

            QUESTION

            Is it possible to determine the type of a class field based on the value assigned to it within the function of the class itself?
            Asked 2021-May-28 at 16:16

            Is it possible to determine the type of a class field based on the value assigned to it within the function of the class itself?

            I am writing a wrapper for the ozo library which is based on the boost.Asio library in order to use it with c ++ 20 coroutines. Such a strange need arose in the inability to set the type of the conn field, which must be returned.

            The type I need is deduced when the operator () is called on the object ozo :: request_op reqOp;.A callback is passed to operator (), where the second argument is a variable of the type I need. The type defined for the second argument of the callback must be defined for the class field Awaiter conn.

            In this case, I determined the conn type ConnectionPtr, but this is wrong, because it is suitable only for one specific case. I need to make this functor more versatile. There is also an option how to pass conn from await_suspend to await_resume, but as far as I know, this can only be done through the awaiter class.

            ...

            ANSWER

            Answered 2021-May-28 at 03:38

            In general, you can’t do this because the type of the parameter conn is determined elsewhere, by code that might in some cases be declared after this class is defined. If the function accepting the callback returns something whose type is based on the type the callback returns, you can write something like decltype(reqOp.reqOp(…,[](auto x) {return x;})), but otherwise the information about what type was passed is lost. (There are stateful metaprogramming tricks that might be used to exfiltrate the information with a similar trick, but they’re best avoided.)

            Source https://stackoverflow.com/questions/67721186

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