Network-programming | Small Projects on Socket | Runtime Evironment library
kandi X-RAY | Network-programming Summary
kandi X-RAY | Network-programming Summary
A shell which can access information about any remote server. The interface looks like a bash terminal virtually running on your PC, although everything that is displayed is the content of the server. To access control, you need firewall permissions. So its best to try it out on your own server.
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Top functions reviewed by kandi - BETA
- Gather information about a website
- Get the domain name for a given URL
- Create directory if necessary
- Create a report
- Gets the IP address of the given domain
- Parse Ethernet frame
- Get MAC address from byte string
- Parse IPv4 packet
- Return IPv4 address
- Accept a socket
- Send CLI commands
- Decompose an ICMP packet
- Parse UDP packet
- Parse TCP packet
- Format a multi - line string
- Create a socket
- Bind to a socket
- Create a directory
Network-programming Key Features
Network-programming Examples and Code Snippets
Community Discussions
Trending Discussions on Network-programming
QUESTION
I am building an Windows Form-based app that listens on a port and when it receives a specific command, it opens a window (Form) that requests input.
My problem is that even though I am using a delegated method to open the window, only the window furniture/border is drawn. The contents of the form are not rendered at all.
From searching other answers on S.O., there seem to be two causes for this:
InitializeComponent()not being called- Trying to open the window from a non-UI thread
It appears that #2 is my problem. When I compare the ManagedThreadId in the form constructor and from the callback delegate, they are different.
As far as I can tell from the docs, the delegate should ensure that the callback is run on the UI thread. Can anyone suggest why it isn't?
Below is a simplified version of what my code looks like.
The form
...ANSWER
Answered 2021-May-03 at 06:07As far as I can tell from the docs, the delegate should ensure that the callback is run on the UI thread. Can anyone suggest why it isn't?
There are no docs that should suggest that. I.e. it's not sufficient simply to use a delegate. You have to invoke the delegate using a mechanism that would move that invocation onto the UI thread, and there's nothing like that in the code you posted above. You seem to have misunderstood whatever it was that you read.
The issue with your code is that you appear to have confused the compiler-generated Invoke() method for a delegate with the framework-provided Control.Invoke() method. Your code calls the former, while you should be calling the latter. All that the former does is to actually invoke the delegate; the latter is what handles marshaling the execution of a delegate onto the UI thread so it can be executed there.
Frankly, it's a mistake for the socket-related code to try to address this at all. In the ListenThread() method, just raise the event normally (which ironically is the syntax you're using, so actually you don't need to change anything there). In your OpenFormCommandHandler() method, then you should call the Control.Invoke() method to execute whatever code you need to execute there, such as creating and showing a new form.
Based on your recent edit, in theory here is how you would change your event handler:
QUESTION
I am strugling to find a way to convert this function to C#. could you give me a hand? I have found how to fetch data from the server and get the response using this information here but was not able to find a way to get the indexof and substring the same way this code is doing.
...ANSWER
Answered 2021-Mar-04 at 20:08I translated the code for you, I think this is what you wanted?
QUESTION
Reading the https://www.amazon.com/Unix-Network-Programming-Sockets-Networking/dp/0131411551, chapter
8.14 Determining Outgoing Interface with UDP
A connected UDP socket can also be used to determine the outgoing interface that will be used to a particular destination. This is because of a side effect of the connect function when applied to a UDP socket: The kernel chooses the local IP address (assuming the process has not already called bind to explicitly assign this). This local IP address is chosen by searching the routing table for the destination IP address, and then using the primary IP address for the resulting interface.
If I try to run the example (udpcli01.c):
...ANSWER
Answered 2021-Jan-18 at 19:14You're passing the address of a struct sockaddr_in to the inet_ntop function. For an AF_INET socket it expects a pointer to a struct in_addr.
So instead of this:
QUESTION
I am reading https://www.amazon.com/Unix-Network-Programming-Sockets-Networking/dp/0131411551, and there the author handle the sigchld in handler that calls waitpid rather then wait.
In Figure 5.7, we cannot call wait in a loop, because there is no way to prevent wait from blocking if there are running children that have not yet terminated.
The handler is as follows:
...ANSWER
Answered 2021-Jan-01 at 20:51The while loop condition will run one more time than there are zombie child processes that need to be waited for. So if you use wait() instead of waitpid() with the WNOHANG flag, it'll potentially block forever if you have another still running child - as wait() only returns early with an ECHLD error if there are no child processes at all. A robust generic handler will use waitpid() to avoid that.
Picture a case where the parent process starts multiple children to do various things, and periodically sends them instructions about what to do. When the first one exits, using wait() in a loop in the SIGCHLD handler will cause it to block forever while the other child processes are hanging around waiting for more instructions that they'll never receive.
Or, say, an inetd server that listens for network connections and forks off a new process to handle each one. Some services finish quickly, some can run for hours or days. If it uses a signal handler to catch exiting children, it won't be able to do anything else until the long-lived one exits if you use wait() in a loop once that handler is triggered by a short-lived service process exiting.
QUESTION
In my network-programming course, I've come across the following function, which initializes a struct of type _body:
ANSWER
Answered 2020-Dec-14 at 13:24Writing :
QUESTION
I am beginner for IP/TCP, but reading Addison Wesley : UNIX Network Programming Volume 1, I have the following code:
...ANSWER
Answered 2020-Nov-29 at 18:35Give yourself something to connect with locally first. Try nc -v -l 13 to run netcat listening on port 13, for example, before running your program in a separate terminal. Sorry, I don't have enough rep to only comment.
QUESTION
I am new to ASP.Net core and I am trying to get a new ASP.NET core app started on my machine (Windows 8.1). I am following the tutorial at https://docs.microsoft.com/en-us/aspnet/core/getting-started/?view=aspnetcore-3.1&tabs=windows (which is about as basic as it gets):
- Create the application via: dotnet new webapp -o aspnetcoreapp
- Trust the cert via: dotnet dev-certs https --trust
- Run the application via: dotnet watch run
When I run the application and I navigate to https://localhost:5001/ in Chrome, I receive the following error:
This site can’t be reached
The webpage at https://localhost:5001/ might be temporarily down or it may have moved permanently to a new web address.
ERR_HTTP2_INADEQUATE_TRANSPORT_SECURITY
This feels like a cert issue to me, so I followed the link under "Trust the development certificate section", and I tried to remove and re-add the old cert via:
...ANSWER
Answered 2020-Sep-09 at 12:14Try to add Protocols into Kestrel COnfiguration
QUESTION
UPDATE: In the end I was allowed to install Powershell 3 which gave me access to the Invoke-WebRequest module. I did not end up needing to update .Net framework or change the registry to enforce encryption protocols, which are still valid solutions if anyone should find themselves in a similar situation.
I'm trying to hit my Slack webhook from an environment where I am forced to use Powershell 2.0. The Slack server is not liking either of the available Net.SecurityProtoType types available (ssl3 or tls). I have confirmed from the Slack documentation that tls 1.2 or higher is required here. I get an error message:
...ANSWER
Answered 2020-Jun-30 at 04:42To see which security protocol types/versions are available on your system, you can execute:
QUESTION
I have a requirement to send data asynchronously via TCP. It is a collection of strings ICollection.
I searched and found a good starting example from Microsoft (see below). The sample seems to be under .NET Framework, but I assume it applies to .NET Core as well.
What I am doing:
I am re-purposing the code as a non-static class
I would like to send a collection of strings
ICollection. I know I can rewrite it to send the collection of strings in the main method. Not a problem.I would like to receive a response for each message sent and do something with it. The current response is stored statically in
private static String response = String.Empty;. I don't want it to be static. I want a local method variable.My challenge begins from item 3.. How do I return back that response message that seems only accessible from within
private static void ReceiveCallback( IAsyncResult ar )I do not think changing it to
private static string ReceiveCallback( IAsyncResult ar )would work. If so, how do I read it fromclient.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);?
I put out a 300point bounty on a very old post for a similar question I found: C# Asyn. Socket Programming. Happy to award anyone who answers here, then there.
An additional question is: Is it recommended practice to open a TCP connection, send the multiple messages, then close it? Or to open a TCP connection for each message being sent?
Microsoft Example
...ANSWER
Answered 2020-Jun-13 at 23:30You can create a class (non-static, I called it AsynchronousClient) that implements all the logic of the socket communication straight from the Microsoft example. The relevant additions are the 3 events (more on handling and raising events):
1) ConnectionComplete, fired when an asynchronous connection operation is completed;
2) SendComplete, fired when data (a string, in this example) is successfully sent;
3) DataReceived, fired when there is incoming data from the remote endpoint.
Basically, the class exposes 3 public methods: AsyncConnect, AsyncSend and AsyncReceive. On the 3 private callbacks the corresponding event in the list above is fired and the class using AsynchronousClient is notified of the termination of the operation.
QUESTION
i use this code for working with Port
but I get the following error. No connection could be made because the target machine actively refused it.
Should I not connect(bind) the socket to the port?
...ANSWER
Answered 2019-Nov-05 at 08:52i changd code.
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You can use Network-programming like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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