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  • c# How to get string from byte?

    - by Kade
    I have a form-console application which does a TCP socket connections for send and receive. I need help getting the following response to STRING. The following code does write the RESPONSE to the console, but i also want to byte[] b = new byte[100]; int k = s.Receive(b); Console.WriteLine("Recieved..."); for (int i = 0; i < k; i++) Console.Write(Convert.ToChar(b[i])); ASCIIEncoding asen = new ASCIIEncoding(); s.Send(asen.GetBytes("RECEIVED :")); i want to get something like String GETSTRING; byte[] b = new byte[100]; int k = s.Receive(b); Console.WriteLine("Recieved..."); for (int i = 0; i < k; i++) Console.Write(Convert.ToChar(b[i])); GETSTRING = *WHATEVER RESPONSE RECEIVED ABOVE* ASCIIEncoding asen = new ASCIIEncoding(); s.Send(asen.GetBytes("RECEIVED :"));

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  • Can two different UDP socket in a system bind same port?

    - by swift
    I have an application which uses UDP connection, now when i try to run the app more than once its throwing me an exception java.net.BindException: Address already in use: Cannot bind but in my another app, which uses tcp connection, i can open two instance of the same app and its working fine. why this error only with UDP connection?

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  • WinSock best accept() practices

    - by Meta
    Imagine you have a server which can handle only one client at a time. The server uses WSAAsyncSelect to be notified of new connections. In this case, what is the best way of handling FD_ACCEPT messages: A Accept the connection attempt right away but queue the client until its turn? B Do not accept the next connection attempt until we are done serving the currently connected client? What do you guys think is the most efficient?

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  • Poblem with "CFDataRef".

    - by zp26
    Hello I have a problem with "CFDataRef. I get the "data" field from a "kCFSocketDataCallBack. "data" should correspond to a string received on the socket. How do I convert, for example, in a NSString so I can put my text in a textbox?? Thank you very much static void AcceptDataCallback(CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) { //my code for the textBox }

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  • C socket and openssl (RSA)

    - by giozh
    there's something strange in my client/server socket using RSA. If i test it on localhost, everithing goes fine, but if i put client on a pc and server on othe pc, something gone wrong. Client after call connect, call a method for public keys exchange with server. This part of code works fine. After this, client send a request to server: strcpy(send_pack->op, "help\n"); RSA_public_encrypt(strlen(send_pack->op), send_pack->op, encrypted_send->op, rsa_server, padding); rw_value = write(server, encrypted_send, sizeof (encrypted_pack)); if (rw_value == -1) { stampa_errore(write_error); close(server); exit(1); } if (rw_value == 0) { stampa_errore(no_response); close(server); exit(1); } printf("---Help send, waiting for response\n"); set_alarm(); rw_value = read(server, encrypted_receive, sizeof (encrypted_pack)); alarm(0); if (rw_value == -1) { stampa_errore(read_error); exit(1); } if (rw_value == 0) { stampa_errore(no_response); close(server); exit(1); } RSA_private_decrypt(RSA_size(rsa), encrypted_receive->message, receive_pack->message, rsa, padding); printf("%s\n", receive_pack->message); return; } but when server try to decrypt the receive message on server side, the "help" string doesn't appear. This happen only on the net, on localhost the same code works fine... EDIT: typedef struct pack1 { unsigned char user[encrypted_size]; unsigned char password[encrypted_size]; unsigned char op[encrypted_size]; unsigned char obj[encrypted_size]; unsigned char message[encrypted_size]; int id; }encrypted_pack; encrypted_size is 512, and padding used is RSA_PKCS1_PADDING

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  • [Java] Listening for TCP and UDP requests on the same port

    - by user339328
    I am writing a Client/Server set of programs Depending on the operation requested by the client, I use make TCP or UDP request. Implementing the client side is straight-forward, since I can easily open connection with any protocol and send the request to the server-side. On the servers-side, on the other hand, I would like to listen both for UDP and TCP connections on the same port. Moreover, I like the the server to open new thread for each connection request. I have adopted the approach explained in: link text I have extended this code sample by creating new threads for each TCP/UDP request. This works correctly if I use TCP only, but it fails when I attempt to make UDP bindings. Please give me any suggestion how can I correct this. tnx

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  • How to identify end of InputStream in java

    - by Vardhaman
    I am trying to read bytes from server using Socket program, ie I am using InputStream to read the bytes. If I pass the length size I am able to read the bytes, but I am not sure what may be the length. So I am not able initialize the byte array. Also I tried while (in.read() !=-1), I observered it loop works fine when the data is sent , but the next line after the loop is not executable , I feel its still looking for the data in the stream but there is no ata. If I close the Server connection , then my client will execute the next line followed to the loop. I am not sure where I am going wrong? this.in = socket.getInputStream(); int dataInt = this.in.read(); while(dataInt != -1){ System.out.print(","+i+"--"+dataInt); i++; dataInt = this.in.read(); } System.out.print("End Of loop"); I get the output as:- ,1--0,2--62,3--96,4--131,5--142,6--1,7--133,8--2,9--16,10--48,11--56,12--1,13--0,14--14,15--128,16--0,17--0,18--0,19--48,20--0,21--0,22--0,23--0,24--0,25--1,26--0,27--0,28--38,29--114,30--23,31--20,32--70,33--3,34--20,35--1,36--133,37--48,38--51,39--49,40--52,41--49,42--55,43--49,44--52,45--52,46--54,47--55,48--50,49--51,50--52,51--48,52--53,53--56,54--51,55--48,56--48,57--57,58--57,59--57,60--57,61--57,62--57,63--57,64--56 But no output for :- End Of loop Please guide how shall I close the loop? Looking forward for you response. Thanking you all in advance.

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  • Interrupt mechanism in C,C++

    - by mawia
    Hey I was writing a udp client server in which a client waits for packets from server.But I want to limit this wait for certain time.After client don't get response for a certain moment in raise an alarm,basically it comes out and start taking remedy steps.So what are the possible solution for it.I think writing a wrapper around recv will work but how exactly this has to be done,I mean how will make recv raise alarm for you after that time limit. Any Help in this regard will be appreciated. Thanks!

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  • pop3 multiline problem

    - by stupid_idiot
    hi everyone, i'm making a client for pop3 and somehow i can't figure out how to handle multiline responses. There is no difference in the first response from server whether it is single or multiline, it always ends with CRLF (considering the usual case) so how do I do I know if I should call recv() once more?

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  • How to make socket.recv(500) not stop a while loop.

    - by ImTooStupidForThis
    I made an IRC bot which uses a while true loop to receive whatever is said. To receive I use recv(500), but that stops the loop if there isn't anything to receive, but i need the loop to continue even if there isn't anything to receive. I need a makeshift timer to continue running. Example code: /A lot of stuff/ timer=0 while 1: timer=timer+1 line=s.recv(500) #If there is nothing to receive, the loop and thus the timer stop. /A lot of stuff/ So either I need a way to stop it stopping the loop, or I need a better timer.

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  • Java checking connection via socket continuously

    - by Onca
    I'm developing a multiclient-server program with Java based on GUI and database. The demand regarding the program from the client side is to make sure all the time that there is a connection to the server, and if the connection is lost (server goes down/problem with socket or stream) it should be notified. In other words I need a solution for continuously checking the connection to the server. What is the best way to do that ?

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  • Respond to a UDP message

    - by JDCAce
    I have a pair of very simple C# programs (server and client). The client's user enters an IP address, and the client sends a UDP message to the server. The server uses UDPClient.Receive() to listen to IPAddress.Any, prints out the message it received and where it was sent from (the client's IP address), then sends a UDP message back to the client. The problem is in that last part: my client is not receiving any message. It listens only to the server, instead of IPAddress.Any. The SendUdpMessage() and WaitForMessage() methods are identical, except for the IPAddress.Any part. I cannot find what's wrong! I can post the code if I need to, but I don't know which part is relevant, and I don't want to post the entire program (about 150 lines combined).

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  • Python: Matching & Stripping port number from socket data

    - by tobywuk
    Hello, I have data coming in to a python server via a socket. Within this data is the string '<port>80</port>' or which ever port is being used. I wish to extract the port number into a variable. The data coming in is not XML, I just used the tag approach to identifying data for future XML use if needed. I do not wish to use an XML python library, but simply use something like regexp and strings. What would you recommend is the best way to match and strip this data? I am currently using this code with no luck: p = re.compile('<port>\w</port>') m = p.search(data) print m Thank you :)

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  • NVIDIA présente son premier CPU pour PC, fondé sur l'architecture ARM, « Denver » est déjà compatible Windows 8

    NVIDIA présente son premier CPU pour PC Fondé sur l'architecture ARM, « Denver » est déjà compatible Windows 8 NVIDIA vient de présenter, durant la très prolifique conférence du Consumer Electronics Show, une série de coeurs de CPU fondés sur l'architecture ARM et destinés aux PC. Cette présentation survient après celle de Microsoft, qui vient d'annoncer officiellement le virage ARM que prendra Windows. Steve Ballmer a en effet effectué hier la première présentation de Windows 8 sur des puces ARM NV...

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  • WWDC : Apple dévoile Metal, une nouvelle bibliothèque graphique pour améliorer les performances de rendu CPU sur les périphériques iOS

    WWDC : Apple dévoile Metal, une nouvelle bibliothèque graphique Son but est d'améliorer les performances de rendu sur CPU pour les périphériques sous iOSDurant la conférence WWDC 2014 (Apple Worldwide Developers Conference), Apple a annoncé une nouvelle bibliothèque graphique bas niveau à l'image de Mantle, appelée Metal. Le but est de drastiquement améliorer les performances de rendu sur CPU, pour les périphériques sous iOS. À cette occasion, Apple a travaillé avec Epic Games afin de produire...

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  • efficient android rendering

    - by llll
    I've read quite a few tutorials on game programming on android, and all of them provide basically the same solution as to drawing the game, that is having a dedicated thread spinning like this: public void run() { while(true) { if(!surfaceHolder.getSurface().isValid()) continue; Canvas canvas = surfaceHolder.lockCanvas(); drawGame(canvas); /* do actual drawing here */ surfaceHolder.unlockCanvasAndPost(canvas); } } now I'm wondering, isn't this wasteful? Suppose I've a game with very simple graphics, so that the actual time in drawGame is little; then I'm going to draw the same things on and on, stealing cpu from the other threads; a possibility could be skipping the drawing and sleeping a bit if the game state hasn't changed, which I could check by having the state update thread mantaining a suitable status flag. But maybe there are other options. For example, couldn'it be possible to synchronize with rendering, so that I don't post updates too often? Or am I missing something and that is precisely what lockCanvas does, that is it blocks and burns no cpu until proper time? Thanks in advance L.

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  • Mysql 100% CPU + Slow query

    - by felipeclopes
    I'm using the RDS database from amazon with a some very big tables, and yesterday I started to face 100% CPU utilisation on the server and a bunch of slow query logs that were not happening before. I tried to check the queries that were running and faced this result from the explain command +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ | 1 | SIMPLE | businesses | const | PRIMARY | PRIMARY | 4 | const | 1 | Using index; Using temporary; Using filesort | | 1 | SIMPLE | activities_businesses | ref | PRIMARY,index_activities_users_on_business_id,index_tweets_users_on_tweet_id_and_business_id | index_activities_users_on_business_id | 9 | const | 2252 | Using index condition; Using where | | 1 | SIMPLE | activities_b_taggings_975e9c4 | ref | taggings_idx | taggings_idx | 782 | const,myapp_production.activities_businesses.id,const | 1 | Using index condition; Using where | | 1 | SIMPLE | activities | eq_ref | PRIMARY,index_activities_on_created_at | PRIMARY | 8 | myapp_production.activities_businesses.activity_id | 1 | Using where | +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ Also checkin in the process list, I got something like this: +----+-----------------+-------------------------------------+----------------------------+---------+------+--------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-----------------+-------------------------------------+----------------------------+---------+------+--------------+------------------------------------------------------------------------------------------------------+ | 1 | my_app | my_ip:57152 | my_app_production | Sleep | 0 | | NULL | | 2 | my_app | my_ip:57153 | my_app_production | Sleep | 2 | | NULL | | 3 | rdsadmin | localhost:49441 | NULL | Sleep | 9 | | NULL | | 6 | my_app | my_other_ip:47802 | my_app_production | Sleep | 242 | | NULL | | 7 | my_app | my_other_ip:47807 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 8 | my_app | my_other_ip:47809 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 9 | my_app | my_other_ip:47810 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 10 | my_app | my_other_ip:47811 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 11 | my_app | my_other_ip:47813 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | ... So based on the numbers, it looks like there is no reason to have a slow query, since the worst execution plan is the one that goes through 2k rows which is not much. Edit 1 Another information that might be useful is the slow query_log SET timestamp=1401457485; SELECT my_query... # User@Host: myapp[myapp] @ ip-10-195-55-233.ec2.internal [IP] Id: 435 # Query_time: 95.830497 Lock_time: 0.000178 Rows_sent: 0 Rows_examined: 1129387 Edit 2 After profiling, I got this result. The result have approximately 250 rows with two columns each. +----------------------+----------+ | state | duration | +----------------------+----------+ | Sending data | 272 | | removing tmp table | 0 | | optimizing | 0 | | Creating sort index | 0 | | init | 0 | | cleaning up | 0 | | executing | 0 | | checking permissions | 0 | | freeing items | 0 | | Creating tmp table | 0 | | query end | 0 | | statistics | 0 | | end | 0 | | System lock | 0 | | Opening tables | 0 | | logging slow query | 0 | | Sorting result | 0 | | starting | 0 | | closing tables | 0 | | preparing | 0 | +----------------------+----------+ Edit 3 Adding query as requested SELECT activities.share_count, activities.created_at FROM `activities_businesses` INNER JOIN `businesses` ON `businesses`.`id` = `activities_businesses`.`business_id` INNER JOIN `activities` ON `activities`.`id` = `activities_businesses`.`activity_id` JOIN taggings activities_b_taggings_975e9c4 ON activities_b_taggings_975e9c4.taggable_id = activities_businesses.id AND activities_b_taggings_975e9c4.taggable_type = 'ActivitiesBusiness' AND activities_b_taggings_975e9c4.tag_id = 104 AND activities_b_taggings_975e9c4.created_at >= '2014-04-30 13:36:44' WHERE ( businesses.id = 1 ) AND ( activities.created_at > '2014-04-30 13:36:44' ) AND ( activities.created_at < '2014-05-30 12:27:03' ) ORDER BY activities.created_at; Edit 4 There may be a chance that the indexes are not being applied due to difference in column type between the taggings and the activities_businesses, on the taggable_id column. mysql> SHOW COLUMNS FROM activities_businesses; +-------------+------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | activity_id | bigint(20) | YES | MUL | NULL | | | business_id | bigint(20) | YES | MUL | NULL | | +-------------+------------+------+-----+---------+----------------+ 3 rows in set (0.01 sec) mysql> SHOW COLUMNS FROM taggings; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | tag_id | int(11) | YES | MUL | NULL | | | taggable_id | bigint(20) | YES | | NULL | | | taggable_type | varchar(255) | YES | | NULL | | | tagger_id | int(11) | YES | | NULL | | | tagger_type | varchar(255) | YES | | NULL | | | context | varchar(128) | YES | | NULL | | | created_at | datetime | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ So it is examining way more rows than it shows in the explain query, probably because some indexes are not being applied. Do you guys can help m with that?

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  • Upgrade Intel Xeon Prestonia to a 64-bit processor

    - by IDisposable
    In theory, could I upgrade a mPGA604-socket motherboard with a Prestonia processor to some Intel Xeon processor with 64-bit? I've got a Dell PowerEdge 1750 with dual 2.8GHz Xeon processors running my Windows Home Server machine. I want to upgrade to the upcoming Vail release, but it is 64-bit only. The processors are Prestonia-core, which is pre-64bit, but I was wondering if it was possible to swap in some pin-compatible later generation processor. According to wikipedia, the mPGA604-socket continues to be used for several later generations that do have same pinout. So, IN THEORY, could I swap in a 64-bit, like a Nocona-core?

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  • Is the Asus Lion Square compatible with an AMD Athlon II AM3?

    - by wag2639
    I bought an Asus Lion Square compatible with a AMD Athlon II X3 435 Socket AM3 processor? I know strictly speaking, the Lion Square specifies AM2 but I'm a little confused since AM2 and AM3 are suppose to be socket compatible (I'm a little confused here as well but I assume it means an AM3 board will support AM2/AM2+ CPUs). However, will there be a problem with chip height and spacing? Or do people have experience asking ASUS for a standoff adapter?

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  • which factors determines the speed of a processor? [closed]

    - by Deb
    I think that clock rate of processor determines the speed of core, in my case it is 1.86GHz. But If I am not wrong, it also determines that how much energy it will consume. If you have more frequency then more power it will consume. I choose Power Saver scheme to increase my battery life, however it reduces my core speed to half of the actual speed. I understand this happens because of SpeedStep, but I don't see any slowdown of my computer. So my problem is why we have such high frequency cores as it uses too much power. We can use low frequency cores. Actually I get confused between the two terms Speed of the processor and its frequency. So how much important is the frequency of core in case of any processor.

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  • How is time measured in computer systems?

    - by DRK3
    Something I have been puzzled about is this: how exactly does a computer regulate and tell time? For example: if I were to write a program that did this: Do 2+2 then wait 5 seconds How does the processor know what "5 seconds" is? How is time measured in computer systems? Is there a specific chip for that sole purpose? How does it work? Thanks for any replies; I'm really interested in computer science, and would love any help you could give me =D.

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  • Home ZFS based NAS...What processor/chipset to use?

    - by MrBlargityBlarg
    So, I'm building a home/personal NAS. My plan is to expose both SMB fileshares for sharing files/media between hosts, but also to carve an iSCSI target LUN out of it for use by VMWare as a datastore. I want to use ZFS (software RAID) so that means I'll either be using FreeNAS, Solaris Express, or OpenIndiana. My question is basically: How much horsepower do I need? Obviously I/O is going to be my bottleneck but I want to be sure that I am not limiting my I/O because of a slow processor or chipset. So far the hardware plan is to use an Intel i3 and motherboard with one of the H87, Q87, or Z87 chipsets, a SAS controller (JBOD, no RAID) and if budget allows, I'm also hoping to get an SSD for the ZFS L2ARC and ZIL. Does anyone think I could get away with an Intel Atom or cheaper/less-capable processor/chipset than the i3 and [HQZ]87 listed above?

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