Nish Nishant is the Principal Software Architect/Consultant for Ganymede Software Solutions LLC, and is based out of Columbus, Ohio. He has over 17 years of software industry experience in various roles including Lead Software Architect, Principal Software Engineer, and Product Manager. Nish was a Microsoft Visual C MVP between 2002 and 2015. Nish is an industry acknowledged expert in the Microsoft technology stack. He authored C/CLI in Action for Manning Publications in 2005, and had previously co-authored Extending MFC Applications with the.NET Framework for Addison Wesley in 2003. In addition, he has over 140 published technology articles on CodeProject.com and another 250+ blog articles on his WordPress blog.
Nish is vastly experienced in team management, mentoring teams, and directing all stages of software development. Contact Nish: If you are interested in hiring Nish as a consultant, you can reach him via his google email id voidnish. Company Website. Jcheng 31-Mar-06 18:37 31-Mar-06 18:37 Dear all, Is there any idea to implement a TCP Server with send and recv without order. Say, once the tcp server is connected, the server can recv or send data without concerning the order. In the code example, there is a pre-defined sequence for send and recv function in the ClientThread. However this is not possible for a chat server, (i.e.
Aqa a psychology. Buy The Complete Companions: A2 Student Book for AQA A Psychology (Third Edition) (PSYCHOLOGY COMPLETE COMPANION) 3. The Complete Companions: A2 Student Book for AQA A Psychology (Third Edition) by Cardwell, Mike, Flanagan, Cara (2012) Paperback [Mike, Flanagan, Cara Cardwell] on.
You can send something to others without recv from your counterpart) so, is there any way to overcome this issue. If I implement this mechanism using 2 threads using Overlapped I/O model, 1 for reading data and 1 for sending data. Do I need to synchronize the socket. Thanks Joseph. Syaks 26-Oct-04 0:44 26-Oct-04 0:44 i am a beginer to socket programming, i read your article i think it the best for beginers like me, i have two questions; 1.
My question is how can i assign a specific ip address to server and client for example 193.125.100.10 and 193.125.100.11 for server and client respectively. 2nd question is i want the application to act as server and client simultaneously, and can chat with multiple peers simultaneously.
I will be greatful for your help, and i am sure you will help beginner like me. Thanks and bye. Dharani 21-Jun-04 18:26 21-Jun-04 18:26 Hi author Great article.
I have already done a mp3 stream server using MFC CSocket. I understand that the OnAccept OnReceive and OnClose are the primary virtual functions which can be used to do the same work your class is doing right?
But one question I have is - For each established connection there is a thread running under CSocket right?? Is is disadvantageous? Moreover I faced a bizzare problem when I used MFC socket-thats if the server listening at a port XXXX became inactive to incoming connections after some 8-10 hours. Is there any timeout associated with the CSocket? If so how to remove it? I am too much obsessed with CSocket that I am trying to solve the issues of CSocket rather than trying to move to other Thread pool strategy.I am about to develope another Socket server which is supposed to take a maximum of 100 clients which will stream in XML requests forth and back.I want to be sure of my design before proceeding further.
Program To Test Microphone
Any ideas please?? Regards and thanks in advance Dharani Babu S. Ancient Scientist 9-Jan-04 13:51 9-Jan-04 13:51 When I telnet on a single machine, there is no authorisation.
I can just send the file. Is this correct?
Does it only work with more than one machine? I am using XP. Also why did you not explain the code: char buff512; CString cmd; CString params; int n; int x; BOOL auth=false; SOCKET client=(SOCKET)pParam;//especially these strcpy(buff,'#Server Ready. R n');//2 lines! Send(client,buff,strlen(buff),0); while(true) n=recv(client,buff,512,0); if(nSOCKETERROR ) break; buffn=0; As I feel they are important in understanding what is going on? Thanks for the advice that has worked though. At 48, I thought I must finish this piece of homework!
Last Visit: 31-Dec-99 19:00 Last Update: 11-Feb-18 7:50 1 General News Suggestion Question Bug Answer Joke Praise Rant Admin Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.
This section shows you how to write a server and the client that goes with it. The server in the client/server pair serves up Knock Knock jokes. Knock Knock jokes are favored by children and are usually vehicles for bad puns. They go like this: Server: 'Knock knock!' Client: 'Who's there?' Server: 'Dexter.'
Client: 'Dexter who?' Server: 'Dexter halls with boughs of holly.' Client: 'Groan.'
The example consists of two independently running Java programs: the client program and the server program. The client program is implemented by a single class, and is very similar to the example from the previous section. The server program is implemented by two classes: and. KnockKnockServer, which is similar to, contains the main method for the server program and performs the work of listening to the port, establishing connections, and reading from and writing to the socket. The class serves up the jokes. It keeps track of the current joke, the current state (sent knock knock, sent clue, and so on), and returns the various text pieces of the joke depending on the current state.
This object implements the protocol—the language that the client and server have agreed to use to communicate. The following section looks in detail at each class in both the client and the server and then shows you how to run them. The Knock Knock Server This section walks through the code that implements the Knock Knock server program,. The server program begins by creating a new object to listen on a specific port (see the statement in bold in the following code segment). When running this server, choose a port that is not already dedicated to some other service. For example, this command starts the server program KnockKnockServer so that it listens on port 4444.
Int portNumber = Integer.parseInt(args0); try ( ServerSocket serverSocket = new ServerSocket(portNumber); Socket clientSocket = serverSocket.accept; PrintWriter out = new PrintWriter(clientSocket.getOutputStream, true); BufferedReader in = new BufferedReader( new InputStreamReader(clientSocket.getInputStream)); ) ServerSocket is a class that provides a system-independent implementation of the server side of a client/server socket connection. The constructor for ServerSocket throws an exception if it can't listen on the specified port (for example, the port is already being used). In this case, the KnockKnockServer has no choice but to exit. If the server successfully binds to its port, then the ServerSocket object is successfully created and the server continues to the next step—accepting a connection from a client (the next statement in the try-with-resources statement). ClientSocket = serverSocket.accept; The method waits until a client starts up and requests a connection on the host and port of this server.
(Let's assume that you ran the server program KnockKnockServer on the computer named knockknockserver.example.com.) In this example, the server is running on the port number specified by the first command-line argument. When a connection is requested and successfully established, the accept method returns a new object which is bound to the same local port and has its remote address and remote port set to that of the client. The server can communicate with the client over this new Socket and continue to listen for client connection requests on the original ServerSocket This particular version of the program doesn't listen for more client connection requests.
However, a modified version of the program is provided in. After the server successfully establishes a connection with a client, it communicates with the client using this code. String hostName = args0; int portNumber = Integer.parseInt(args1); try ( Socket kkSocket = new Socket(hostName, portNumber); PrintWriter out = new PrintWriter(kkSocket.getOutputStream, true); BufferedReader in = new BufferedReader( new InputStreamReader(kkSocket.getInputStream)); ) When creating its socket, the KnockKnockClient example uses the host name of the first command-line argument, the name of the computer on your network that is running the server program KnockKnockServer.
The KnockKnockClient example uses the second command-line argument as the port number when creating its socket. This is a remote port number—the number of a port on the server computer—and is the port to which KnockKnockServer is listening. For example, the following command runs the KnockKnockClient example with knockknockserver.example.com as the name of the computer that is running the server program KnockKnockServer and 4444 as the remote port number. Java KnockKnockClient knockknockserver.example.com 4444 The client's socket is bound to any available local port—a port on the client computer. Remember that the server gets a new socket as well. If you run the KnockKnockClient example with the command-line arguments in the previous example, then this socket is bound to local port number 4444 on the computer from which you ran the KnockKnockClient example.
The server's socket and the client's socket are connected. Next comes the while loop that implements the communication between the client and the server. The server speaks first, so the client must listen first. The client does this by reading from the input stream attached to the socket. If the server does speak, it says 'Bye.'
And the client exits the loop. Otherwise, the client displays the text to the standard output and then reads the response from the user, who types into the standard input. After the user types a carriage return, the client sends the text to the server through the output stream attached to the socket. Java KnockKnockClient knockknockserver.example.com 4444 If you are too quick, you might start the client before the server has a chance to initialize itself and begin listening on the port. If this happens, you will see a stack trace from the client.
If this happens, just restart the client. If you try to start a second client while the first client is connected to the server, the second client just hangs. The next section, talks about supporting multiple clients. When you successfully get a connection between the client and server, you will see the following text displayed on your screen. Server: Knock!
Client: Who's there? Server: Turnip Turnip who? Client: Turnip who? Server: Turnip the heat, it's cold in here! Want another? (y/n) If you want to hear another joke, type y; if not, type n.
If you type y, the server begins again with 'Knock! If you type n, the server says 'Bye.'
Thus causing both the client and the server to exit. If at any point you make a typing mistake, the KnockKnockServer object catches it and the server responds with a message similar to this. Server: Try again.
Note that the KnockKnockProtocol object is particular about spelling and punctuation but not about capitalization. To keep the KnockKnockServer example simple, we designed it to listen for and handle a single connection request.
However, multiple client requests can come into the same port and, consequently, into the same ServerSocket. Client connection requests are queued at the port, so the server must accept the connections sequentially.
CD-ROM including Printer Driver. (Windows only), Easy. And accessories that can enhance your user experience with you PIXMA MX700 that you can. Download the latest Windows drivers for Canon MX700 Driver. Drivers Update tool checks your computer for old drivers and update it. Get latest Canon MX700 Driver driver! Installed Windows 10 and my MX700 no longer works. There appear to be no available drivers, and the message from Canon is to upgrade my printer. Canon mx700 printer driver windows 10. Download the latest drivers for your Canon MX700 series Printer to keep your Computer up-to-date.
However, the server can service them simultaneously through the use of threads—one thread per each client connection. The basic flow of logic in such a server is this. Try This: Modify the KnockKnockServer so that it can service multiple clients at the same time. Two classes compose our solution: and. KKMultiServer loops forever, listening for client connection requests on a ServerSocket. When a request comes in, KKMultiServer accepts the connection, creates a new KKMultiServerThread object to process it, hands it the socket returned from accept, and starts the thread. Then the server goes back to listening for connection requests.
The KKMultiServerThread object communicates to the client by reading from and writing to the socket. Run the new Knock Knock server KKMultiServer and then run several clients in succession.
I have written a TCP server implementation using which I created an application which works as TCP echo service. Now I want to test this echo server in terms of. How many connections it can handle. What is the response time.
How much memory and CPU it uses Please can you suggest any standard method/tools to test this echo server. I understand that both TCP and echo server implementation is fairly standard practice so I hope to find established tools to test it. P.S.: I can write my own test application but I don't want to do it because if I see some problem, I need to be sure that it is my server that is doing it wrong. I don't want to end up testing my test client first. I wrote this implementation using C# and.NET 3.5 though I believe it doesn't matter with reference to the question.
I have a free tool that might help you. I use it for testing servers that are built with my C server framework. The tool is available here:. It allows you to create a configurable number of connections to your target server at a configurable rate and then send data on each connection (again at a configurable rate).
If find that the best way to use it is to run it on a different machine to the server (fairly obvious I know, but.) and possibly to run multiple copies on multiple different machines. Note that if you find you can't make more than around 4000 connections then it's quite likely that you need to tweak your MAXUSERPORT registry setting on the machine that's running the client.
Once you've tested your TCP code you may find you need to test the protocol that your server supports. I wrote a test tool for this kind of situation in C# which is available on CodeProject. This allows you to write a 'plugin' to support your protocol and handles the protocol agnostic stuff (lots of connections, breaking messages up so that you get fragmented reads, etc) for you. The design is a rather nasty thread-per-connection design and for higher numbers of connections you'd be better off reimplementing something using an async design but I have my C tools for that so I never got around to changing this test program.
Remember ServerSocket.setSoTimeout is different from client's function with same name. For server, this function only throws SocketTimeoutException for you to catch it if timeout is expired, but the server socket still remains.
For client, setSoTimeout relates to 'read timeout' for stream reading. In your case, you must show your server code of closing the connected socket after catching SocketTimeoutException = ensure server closed the associated socket with a specified client. If done, at client side, your code line: throw new RuntimeException('Problem sending data to server.' , e); will be called. Update I noticed that you stated to set timeout for the accepted socket at server side to 10 secs (=10,000 milliseconds); for that period, did your client complete all the file sending?
If it did, never the exception occurs. Suggest for probing, just comment out your code of reading file content to send to server, and try replacing with several lines of writing to output stream: outStream.writeUTF('ONE'); outStream.writeUTF('TWO'); outStream.writeUTF('TREE'); Then you can come to the conclusion.
::SocketTest:: - Test My Socket SocketTest A java tool for socket testing. It can create both TCP and UDP client or server.
It can be used to test any server or client that uses TCP or UDP protocol to communicate. Licence:- System Req:- Memory: 32MB RAM, Processer: 400 MHz, Java Virtual Machine (JVM)1.3 or above. Features:-.
Create a TCP client socket and send commands. Create a UDP client socket and send commands.
Create a TCP server socket and send responses to connected clients. Create a UDP server socket that listens on a particular port. Save the conversation with the client or host to a txt file. TrustManager to prompt if certificate does not get validated. Screen Shots of SocketTest v3.0.0 Copyright © 2003-2008 Akshathkumar Shetty.
Comments are closed.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |