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  • Storing a large list in isolatedStorage on WP7

    - by Ra
    I'm storing a List with around 3,000 objects in Isolatedstorage using Xml serialize. It takes too long to deserialize this and I was wondering if you have any recommendations to speed it up. The time is tolerable to deserialize up to 500 objects, but takes forever to deserialize 3000. Does it take longer just on the emulator and will be faster on the phone? I did a whole bunch of searching and some article said to use a binary stream reader, but I can't find it. Whether I store in binary or xml doesn't matter, I just want to persist the List. I don't want to look at asynchronous loading just yet...

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  • Writing Android apps in C#

    - by JamesBrownIsDead
    I'm a C# programmer and want to write an Android app. I'm a stubborn curmudgeon and refuse to write Java ever again (after switching to C# six years ago). Besides Mono and MonoDroid (and writing Java), are there any options for me? Or should I just feel foolish for refusing to returning to my Java roots? (Please refrain from Java-related vs. C# discussion. I was being rhetorical when I asked about returning to me Java roots.)

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  • How large should my recv buffer be when calling recv in the socket library

    - by Silmaril89
    Hi, I have a few questions about the socket library in C. Here is a snippet of code I'll refer to in my questions. char recv_buffer[3000]; recv(socket, recv_buffer, 3000, 0); First, How do I decide how big to make recv_buffer? I'm using 3000, but it's arbitrary. Second, what happens if recv() receives a packet bigger than my recv_buffer? Third, how can I know if I have received the entire message without calling recv again and have it wait forever when there is nothing to be received? And finally, is there a way I can make a buffer not have a fixed amount of space, so that I can keep adding to it without fear of running out of space? maybe using strcat to concatenate the latest recv() response to the buffer? I know it's a lot of questions in one, but I would greatly appreciate any responses.

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  • Encrypted AES key too large to Decrypt with RSA (Java)

    - by Petey B
    Hello, I am trying to make a program that Encrypts data using AES, then encrypts the AES key with RSA, and then decrypt. However, once i encrypt the AES key it comes out to 128 bytes. RSA will only allow me to decrypt 117 bytes or less, so when i go to decrypt the AES key it throws an error. Relavent code: KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA"); kpg.initialize(1024); KeyPair kpa = kpg.genKeyPair(); pubKey = kpa.getPublic(); privKey = kpa.getPrivate(); updateText("Private Key: " +privKey +"\n\nPublic Key: " +pubKey); updateText("Encrypting " +infile); //Genereate aes key KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128); // 192/256 SecretKey aeskey = kgen.generateKey(); byte[] raw = aeskey.getEncoded(); SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); updateText("Encrypting data with AES"); //encrypt data with AES key Cipher aesCipher = Cipher.getInstance("AES"); aesCipher.init(Cipher.ENCRYPT_MODE, skeySpec); SealedObject aesEncryptedData = new SealedObject(infile, aesCipher); updateText("Encrypting AES key with RSA"); //encrypt AES key with RSA Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); byte[] encryptedAesKey = cipher.doFinal(raw); updateText("Decrypting AES key with RSA. Encrypted AES key length: " +encryptedAesKey.length); //decrypt AES key with RSA Cipher decipher = Cipher.getInstance("RSA"); decipher.init(Cipher.DECRYPT_MODE, privKey); byte[] decryptedRaw = cipher.doFinal(encryptedAesKey); //error thrown here because encryptedAesKey is 128 bytes SecretKeySpec decryptedSecKey = new SecretKeySpec(decryptedRaw, "AES"); updateText("Decrypting data with AES"); //decrypt data with AES key Cipher decipherAES = Cipher.getInstance("AES"); decipherAES.init(Cipher.DECRYPT_MODE, decryptedSecKey); String decryptedText = (String) aesEncryptedData.getObject(decipherAES); updateText("Decrypted Text: " +decryptedText); Any idea on how to get around this?

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  • CakePHP session sharing between two apps, on the same domain

    - by Amit Yadav
    I am having two cakephp application working on the same domain. I access them like localhost:8080/wishlist & localhost:8080/lighthouse The wishlist is a separate cakePHP application and the lighthouse is a separate CakePHP application. The login page is at localhost:8080/lighthouse, now i want the session generated by the lighthouse application to be used in the wishlist application. The directory structure is /htdocs /wishlist /app /config .... /lighthouse /app /config .... I have edited the core.php file for both the application. I am using the same session cookie name and the same security sale but i am not able to get the session on the wishlist application. Can some one let me know how can i share session in between my two application.

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  • Sharp Architecture for Winform apps?

    - by CF_Maintainer
    The Sharp Architecture Contrib seems to suggest it is possible. It seemed like they had a dependency on "PostSharp" which has now been replaced with Castle interceptors. Has anyone used the Sharp Architecture for a non Web project? How was the experience? Does that mean one is locked in with castle as the IoC container when using Sharp architecture for non web purposes? If not Sharp Architecture, then what are some of the favored application frameworks for the non web world [spring.NET?] ? If one were to start a green field Winforms app, what application framework would be desirable?

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  • Facebook Canvas Apps, New API

    - by James
    I'm having some trouble with switching to the new JS API for a number of things with creating applications within FB, specifically the "Tab". <!-- function do_perm() { Facebook.showPermissionDialog('publish_stream,email,offline_access', null); } //--> This no longer works for me when called via an onclick command. Also, with the new API and an FBML app. How does this exactly work? The documentation is really poor so I am confused when looking at the old wiki, and the new developer site. Apologies for being pretty vague, but I'm just generally confused with the lack of clear direction with the new API and help would be greatly appreciated. I'm simply just trying to create a call that prompts for the new style user permission dialog, and oncomplete calls another JS function.

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  • Large data processing in x86 C# gives System.OutOfMemory exception

    - by Cool
    I am processing XML coming from server which contains both images and data in one C# function (compiled 32 bit). When I try to parse this xml in memory it gives me System.OutOfMemory exception. Is there any way to avoid this error? My guess is, system cannot find contiguous block of 50-100MB memory. (my pc hv 8Gig ram and its quad core)

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  • Status of Data in Rollback of Large Transaction in SQL Server

    - by Lloyd Banks
    I have a data warehousing procedure that downloads and replaces dozens of tables from a linked server to a local database. Every once in a while, the code will get stuck on one of the tables on the linked server because the table on the linked server is in a state of transition. I am under the assumption that since the entire procedure is considered one transaction commit, when the procedure gets stuck, none of the changes made by the procudure so far would have committed. But the opposite seems to be true, tables that were "downloaded" before the procedure got stuck would have been updated with today's versions on the local server. Shouldn't SQL Server wait for the entire procedure to finish before the changes are durable? CREATE PROCEDURE MYIMPORT AS BEGIN SET NOCOUNT ON IF EXISTS (SELECT * FROM INFORMATION.SCHEMA.TABLES WHERE TABLE_NAME = 'TABLE1') DROP TABLE TABLE1 SELECT COLUMN1, COLUMN2, COLUMN3 INTO TABLE1 FROM OPENQUERY(MYLINK, 'SELECT COLUMN1, COLUMN2, COLUMN3 FROM TABLE1') IF EXISTS (SELECT * FROM INFORMATION.SCHEMA.TABLES WHERE TABLE_NAME = 'TABLE2') DROP TABLE TABLE2 SELECT COLUMN1, COLUMN2, COLUMN3 INTO TABLE2 FROM OPENQUERY(MYLINK, 'SELECT COLUMN1, COLUMN2, COLUMN3 FROM TABLE2') --IF THE PROCEDURE GETS STUCK HERE, THEN CHANGES TO TABLE1 WOULD HAVE BEEN MADE ON THE LOCAL SERVER WHILE NO CHANGES WOULD HAVE BEEN MADE TO TABLE3 ON THE LOCAL SERVER IF EXISTS (SELECT * FROM INFORMATION.SCHEMA.TABLES WHERE TABLE_NAME = 'TABLE3') DROP TABLE TABLE3 SELECT COLUMN1, COLUMN2, COLUMN3 INTO TABLE3 FROM OPENQUERY(MYLINK, 'SELECT COLUMN1, COLUMN2, COLUMN3 FROM TABLE3') END

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  • HTML table headers always visible at top of window when viewing a large table

    - by Craig McQueen
    I would like to be able to "tweak" an HTML table's presentation to add a single feature: when scrolling down through the page so that the table is on the screen but the header rows are off-screen, I would like the headers to remain visible at the top of the viewing area. This would be conceptually like the "freeze panes" feature in Excel. However, an HTML page might contain several tables in it and I only would want it to happen for the table that is currently in-view, only while it is in-view. Note: I've seen one solution where the table data area is made scrollable while the headers do not scroll. That's not the solution I'm looking for.

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  • multi thread apps crashes in release mode

    - by etzarfat
    Hello, I'm using Visual Studio 2008 (programming in c). I've a weird problem I worte a program that has 2 threads that runs simultaneously, a recording thread (using audio card to record into memory) and a translation thread (using a speech engine to recognize the words). when I run my program in debug mode (aka setting a breakpoint in the code) it runs great, however when I run in debug mode or release mode (outside the visual studio enviroment) it crashes and give me the following exception: "Unhandled exception at 0x7c911129 in LowLevel.exe: 0xC0000005: Access violation reading location 0x014c7245." My stack looks: LowLevel.exe!__set_flsgetvalue() Line 256 + 0xc bytes C LowLevel.exe!_isleadbyte_l(int c=4359676, localeinfo_struct * plocinfo=0x00000001) Line 57 C++ 014b00d8() LowLevel.exe!PlayDateOfExam(int option=1) Line 2240 + 0x7 bytes C++ LowLevel.exe!NSCThread(void * arg=0x00000000) Line 1585 + 0xb bytes C++ kernel32.dll!7c80b729() winmm.dll!76b5b294() I uses the following file in my project "nsc.lib" and WinMM.lib" I'm not really familiar with threads I used a sample (which works great) and built on it. I saw a similiar question year on the forum but I didn't really understand the answers since I'm not familiar with with threads. Can someone help me? Thanks

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  • ASP.NET: Large number of Session_Start with same session id

    - by Jaap
    I'm running a ASP.NET website on my development box (.NET 2.0 on Vista/IIS7). The Session_Start method in global.asax.cs logs every call to a file (log4net). The Session_End method also logs every call. I'm using InProc session state, and set the session timeout to 5 mins (to avoid waiting for 20 mins). I hit the website, wait for 5 minutes unit I see the Session_End logging. Then I F5 the website. The browsers still has the session cookie and sends it to the server. Session_Start is called and a new session is created using the same session id (btw: I need this to be the same session id, because it is used to store data in database). Result: Every time I hit F5 on a previously ended session, the Session_Start method is called. When I open a different browser, the Session_Start method is called just once. Then after 5 minutes the Session_End each F5 causes the Session_Start method to execute. Can anyone explain why this is happening? Update: After the Session timeout, all subsequent requests have a session start & session end. So in the end my question is: why are the sessions on these subsequent request closed immediatly? 2010-02-09 14:49:08,754 INFO Global.asax[7486] [(null)] - Session started. SID=nzponumvf1hbaniverffp4mq host=127.0.0.1 2010-02-09 14:49:08,754 INFO Global.asax[7486] [nzponumvf1hbaniverffp4mq] - Request start: GET http://localhost:80/js/settings.js 2010-02-09 14:49:08,756 INFO Global.asax[7486] [(null)] - Session ended. SID=nzponumvf1hbaniverffp4mq 2010-02-09 14:49:08,760 INFO Global.asax[7486] [(null)] - Session started. SID=nzponumvf1hbaniverffp4mq host=127.0.0.1 2010-02-09 14:49:08,760 INFO Global.asax[7486] [nzponumvf1hbaniverffp4mq] - Request start: GET /css/package.aspx?name=core 2010-02-09 14:49:08,761 INFO Global.asax[7486] [(null)] - Session ended. SID=nzponumvf1hbaniverffp4mq 2010-02-09 14:49:08,762 INFO Global.asax[7486] [(null)] - Session started. SID=nzponumvf1hbaniverffp4mq host=127.0.0.1 2010-02-09 14:49:08,762 INFO Global.asax[7486] [nzponumvf1hbaniverffp4mq] - Request start: GET /js/package.aspx?name=all 2010-02-09 14:49:08,763 INFO Global.asax[7486] [(null)] - Session ended. SID=nzponumvf1hbaniverffp4mq 2010-02-09 14:49:08,763 INFO Global.asax[7486] [(null)] - Session started. SID=nzponumvf1hbaniverffp4mq host=127.0.0.1 2010-02-09 14:49:08,763 INFO Global.asax[7486] [nzponumvf1hbaniverffp4mq] - Request start: GET /css/package.aspx?name=rest 2010-02-09 14:49:08,764 INFO Global.asax[7486] [(null)] - Session ended. SID=nzponumvf1hbaniverffp4mq 2010-02-09 14:49:08,764 INFO Global.asax[7486] [(null)] - Session started. SID=nzponumvf1hbaniverffp4mq host=127.0.0.1 2010-02-09 14:49:08,765 INFO Global.asax[7486] [nzponumvf1hbaniverffp4mq] - Request start: GET /css/package.aspx?name=vacation 2010-02-09 14:49:08,765 INFO Global.asax[7486] [(null)] - Session ended. SID=nzponumvf1hbaniverffp4mq web.config relevant section: <system.web> <compilation debug="true" /> <sessionState timeout="2" regenerateExpiredSessionId="false" /> </system.web>

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  • how to stop directory structure from being viewable in J2EE apps

    - by Omnipresent
    in a J2EE app if user explicitly takes out the the ending page name then what is the best way to not show the directory structure? Example: /mycoolapp/somefolder/test.jsp /mycoolapp/somefolder/ -- this will show all the files under 'somefolder' What is the best way to redirect or show the user a page saying 'not where you belong'. I want to avoid providing index.jsp in all the folders/subfolders of my application. Appserver being used is GlassFish. Also the app is using Struts2 framework, though not all of the code is in struts2. Some code is using traditional Servlets

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  • Is there a suggested solution structure for ASP.NET MVC Production Apps

    - by Eoin Campbell
    In general, I don't like to keep code (BaseClasses or DataAccess Code) in the App_Code directory of an ASP.NET Site. I'll usually pull this stuff out into a MySite.BusinessLogic & MySite.DataAccess DLL's respectively. I'm wondering should I be doing the same for ASP.NET MVC. Would it be better to Organise the solution something along the lines of MySite.Common - DLL - (Basic Functionality built on .NET System Dlls) MySite.DAL - DLL - (DataAccessLayer & DBML Files) MySite.Models - DLL - (MVC Models e.g. Repository Classes) MySite.Controllers - DLL (MVC Controllers which use Models) MySite - ASP.NET MVC Site. Or am I missing something... presumably, I'll lose some of the nice (Add View, Go To Controller, context menu items that have been added)

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  • RichFaces rich:insert takes a long time to output large files

    - by Mark Lewis
    Hello I'm using a RichFaces <rich:insert like this: <rich:panel header="my head"> <a4j:outputPanel ajaxRendered="true"> <rich:insert src="#{MyBacking.myPath}" highlight="groovy" /> </a4j:outputPanel> </rich:panel> If I have a 60k file to output, it takes 23 seconds. I've got a requirement to output the contents of some larger files than that and obviously the larger the file, the larger the wait for content. The recommendation in the answer to another related question is to introduce paging. I will, but the question is, why does it take so long to output 60k of text using JSF/RichFaces? That is, reading off a local disk with Windows XP SP2 PC - I can see from the log the data has already been written to disk from the network. Other scripting languages appear to be faster than this - is it something to do with the JSF lifecycle having to handle the text maybe? Thanks

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  • Oracle performance problems with large batch of XSL operations

    - by FrustratedWithFormsDesigner
    I have a system that is performing many XSL transformations on XMLType objects. The problem is that the system gradually slows down over time, and sometimes crashes when it runs out of memory. It seems that the slow down (and possibly memory crash) is around the dbms_xslprocessor.processXSL function call, which gradually takes longer and longer to complete. The code looks like this: v_doc dbms_xmldom.DOMDocument; v_transformer dbms_xmldom.DOMDocument; v_XSLprocessor dbms_xslprocessor.Processor; v_stylesheet dbms_xslprocessor.Stylesheet; v_clob clob; ... transformer := PKG_STUFF.getXSL(); v_transformer := dbms_xmldom.newDOMDocument(transformer); v_XSLprocessor := Dbms_Xslprocessor.newProcessor; v_stylesheet := dbms_xslprocessor.newStylesheet(v_transformer, ''); ... for source_data in (select id in source_tbl) loop begin v_doc := PKG_CONVERT.convert(in_id => source_data.id); --start time of operation v_begin_op_time := dbms_utility.get_time; --reset the CLOB v_clob := ' '; --Apply XSL Transform dbms_xslprocessor.processXSL(p => v_XSLprocessor, ss => v_stylesheet, xmldoc => v_Doc, cl => v_clob); v_doc := dbms_xmldom.newDOMDocument(XMLType(v_clob)); --end time v_end_op_time := dbms_utility.get_time; --calculate duration v_time_taken := (((v_end_op_time - v_begin_op_time))); --log the duration PKG_LOG.log_message('Time taken to transform XML: '||v_time_taken); ... ... DBMS_XMLDOM.freeDocument(v_Doc); DBMS_LOB.freetemporary(lob_loc => v_clob); end loop; The time taken to transform the XML is slowly creeping up (I suppose it might also be the call to dbms_xmldom.newDOMDocument, but I had thought that to be fairly straightforward). I have no idea why.... :( (Oracle 10g)

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  • Python - CSV: Large file with rows of different lengths

    - by dassouki
    In short, I have a 20,000,000 line csv file that has different row lengths. This is due to archaic data loggers and proprietary formats. We get the end result as a csv file in the following format. MY goal is to insert this file into a postgres database. How Can I do the following: Keep the first 8 columns and my last 2 columns, to have a consistent CSV file Add a Column to the file. 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0, img_id.jpg, -50 1, 2, 3, 4, 5, 0,0,0,0,0,0,0,0,0,0,0 img_id.jpg, -50

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  • Method for finding memory leak in large Java heap dumps

    - by Rickard von Essen
    I have to find a memory leak in a Java application. I have some experience with this but would like advice on a methodology/strategy for this. Any reference and advice is welcome. About our situation: Heap dumps are larger than 1 GB We have heap dumps from 5 occasions. We don't have any test case to provoke this. It only happens in the (massive) system test environment after at least a weeks usage. The system is built on a internally developed legacy framework with so many design flaws that they are impossible to count them all. Nobody understands the framework in depth. It has been transfered to one guy in India who barely keeps up with answering e-mails. We have done snapshot heap dumps over time and concluded that there is not a single component increasing over time. It is everything that grows slowly. The above points us in the direction that it is the frameworks homegrown ORM system that increases its usage without limits. (This system maps objects to files?! So not really a ORM) Question: What is the methodology that helped you succeed with hunting down leaks in a enterprise scale application?

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  • Web Apps: Closeable Announcements/Info/Tooltip boxes (how to implement)

    - by Daxon
    I want to understand how to implement an announcement/info box system that displays a box for the user with information. The user can do nothing or close the box, but then it will never be seen again. E.g. Facebook home page. Box asking for Translators. if you leave it then its always there. But if you close it, it never appears again. Does this mean that a Boolean value needs to be used and checked for announcement/info boxes? I'm looking for a pseudo way with database tables to do this?

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  • YUI Compressor and .NET Apps

    - by objektivs
    I want to use YUI Compressor (the original) and use it as part of typical MS build processes (Visual Studio 2008, MSBuild). Does anyone have any guidance or thoughts on this? For example, good ways for incorporating into project, what to do with existing CSS and JS references, and the like. I am happy to hear on the benefits of YUI Compressor .NET and alternatives but I'm mor einterested in use of the original. Thanks Scott

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  • python / sqlite - database locked despite large timeouts

    - by Chris Phillips
    Hi, I'm sure I'm missing something pretty obvious, but I can't for the life of me stop my pysqlite scripts crashing out with a database is locked error. I have two scripts, one to load data into the database, and one to read data out, but both will frequently, and instantly, crash depending on what the other is doing with the database at any given time. I've got the timeout on both scripts set to 30 seconds: cx = sqlite.connect("database.sql", timeout=30.0) and think I can see some evidence of the timeouts in that i get what appears to be a timing stamp (e.g 0.12343827e-06 0.1 - and how do I stop that being printed?) dumped occasionally in the middle of my curses formatted output screen, but no delay that ever gets remotely near the 30 second timeout, but still one of the other keeps crashing again and again from this. I'm running RHEL5.4 on a 64 bit 4 cpu HS21 IBM blade, and have heard some mention about issues about multi-threading and am not sure if this might be relevant. Packages in use are sqlite-3.3.6-5 and python-sqlite-1.1.7-1.2.1, and upgrading to newer versions outside of RedHat's official provisions is not a great option for me. Possible, but not desirable due to the environment in general. I have had autocommit=1 on previously on both scripts, but have since disabled on both, and am now cx.commit()ing on the inserting script and not committing on the select script. Ultimately as I only ever have one script actually making any modifications, I don't really see why this locking should ever ever happen. I have noticed that this is significantly worse over time when the database has gotten larger. It was recently at 13mb with 3 equal sized tables, which was about 1 day's worth of data. creating a new file has significantly improved this, which seems understandable, but the timeout ultimately just doesn't seem to be being obeyed. Any pointers very much appreciated. Thanks Chris

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  • java : writing large files ?

    - by umanga
    Greetings , I get huge number of records from database and write into a file.I was wondering what the best way to write huge files. (1Gb - 10Gb). Currently I am using BufferedWriter BufferedWriter mbrWriter=new BufferedWriter(new FileWriter(memberCSV)); while(done){ //do writings } mbrWriter.close();

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