tcp-ip | 易学教程

Using Socket.BeginConnect() to connect with server in C# Winform and the IAsyncResult object was not returned error

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问题 I'm doing an application which require me as a client side to connect to a server and receive data from the server. I will need to do re-connection when the connection is disconnected. Below is my code: public enum MySocketState { Disconnected = 0, Connecting, Connected } public Socket theDevSock = null; public MySocketState sockState = MySocketState.Disconnected; void DataProcess() { try { if (theDevSock == null || sockState == MySocketState.Disconnected) { Console.WriteLine("Trying to

How to Connect My Django App with incoming data on a TCP Port

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问题 I am trying to connect a django URL to incoming data on TCP/IP Port. It would be great if someone, could shed some light on this 回答1: You'll probably have to listen on the port from another process, or thread. Save the incoming data somewhere, whether it be a log file, database, or whatever. Then have Django use this data when it prepares the web page to send in response to requests on the URL. 来源： https://stackoverflow.com/questions/16212161/how-to-connect-my-django-app-with-incoming-data-on

How can I restart communication with an FTP server that sends back reset packets without restarting our process?

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问题 We have a (long-running) Windows service that among other things periodically communicates with an FTP server embedded on a third-party device using FtpWebRequest. This works great most of the time, but sometimes our service stops communicating with the device, but as soon as you restart our service everything starts working again. I've spent some time debugging this with an MCVE (included below) and discovered via Wireshark that once communication starts failing there is no network traffic

Need TCPIP client that blocks until a specific character sequence is received

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问题 I need a java 7 TCP/IP client that will block until it receives a user specified character sequence (in my case a message terminator/separator - this would automatically "chunk" the data into individual messages for further processing). I expected that this would be very standard code freely available on the web - but so far no luck. Complicating things, "chunking" the received data using standard line separators (e.g. readLine() in Oracle's KnockKnock Client), is not possible since those

Cannot understand how to convert integer to IP in Android and Java

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问题 I am building a small application for my android phone. My background in not on computer science but I am familiar with C/C++ and some development concepts. Now I was trying to display the IP address of my phone. And according to the Android references I used the getIpAddress() method which returns an Integer. Then Looking in stackoverflow I saw the solution posted here: Android IP address with java which was posted by Paul Ferguson and I am copying it here: String ipString = String.format( "

re-connection using socket in c

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问题 im using socket in c and got success on send/recv. however, the problem is when my server crashes, the client has to reconnect the server (server runs after some time). so here what i did: create a socket connect recv/send if recv size == 0 go to step 2. this algorithm is not working for me. is there any ideas? code: int initSocket(char *servIP, unsigned short serverPort) { portNum = serverPort; ipAddr = servIP; /* Socket descriptor */ struct sockaddr_in echoServAddr; /* Echo server address *

PHP sending message via TCP/IP

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问题 Im try to send a Message from PHP Website via TCP/IP to an Arduino. With following code i'm able to send a message from php website <?php $errno = NULL; $error = NULL; if (!$handle = @fsockopen("192.168.188.24", "49419", $errno, $error, 10)) { die("Fehler (".$errno."): ".$error); } fwrite($handle, "ON\r\n"); fclose($handle); ?> The problem is, when calling the website for the first time, the message doesnt get delivered immediatly. Just after some refreshes of the website, the message arrives

Max MQTT connections

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问题 I have a need to create a server farm that can handle 5+ million connections, 5+ million topics (one per client), process 300k messages/sec. I tried to see what various message brokers were capable so I am currently using two RHEL EC2 instances (r3.4xlarge) to make lots of available resources. So you do not need to look it up, it has 16vCPU, 122GB RAM. I am nowhere near that limit in usage. I am unable to pass the 600k connections limit. Since there doesn't seem to be any O/S limitation

How to set IP address of device connected to Host PC? C# Winform?

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I have a Modbus TCP/IP to MODBUS RTU converter , which comes with a default IP of 192.168.0.1 . I need to develop a small c# Winform app to change this device's IP address to any desired IP address. How do I do that?. You could do it with WMI ( Windows Management Instrumentation ). First, you have to add the reference for System.Management to your Project. Second, you need to find the NetworkInterface for your network connection by name: using System.Net.NetworkInformation; using System.Management; public class NetworkManager { public static NetworkInterface GetNetworkInterface(string sName) {

Best practice for handling low-level socket error in spring integration?

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问题 Hi I'm here again asking for spring integration's tcp-ip related question. Suppose I have a dynamically configured tcp-ip connection factory: <int-ip:tcp-connection-factory id="chatRoomTcpIpClientFactory" type="client" host="${host}" port="${port}" single-use="false" using-nio="false" so-keep-alive="false" so-timeout="${timeout}" serializer="${seri-deseri}" deserializer="${seri-deseri}"/> Here, the host & port are both unknown at the beginning. Sometimes the program cannot grantee that the