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• Efficient way to create/unpack large bitfields in C?

  - by drhorrible

  I have one microcontroller sampling from a lot of ADC's, and sending the measurements over a radio at a very low bitrate, and bandwidth is becoming an issue. Right now, each ADC only give us 10 bits of data, and its being stored in a 16-bit integer. Is there an easy way to pack them in a deterministic way so that the first measurement is at bit 0, second at bit 10, third at bit 20, etc? To make matters worse, the microcontroller is little endian, and I have no control over the endianness of the computer on the other side.

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• How to make scrolling through images as fast as Apple's Photos app

  - by clozach

  The Goal — On an iPhone, to browse through several hundred locally-stored jpgs using a UIScrollView. The Problem — Like many others before me, I've tried implementing a scroll view based on Apple's Page Control sample code and found it lacking. The biggest issue I'm currently up against is that the sample code's architecture doesn't seem to scale. With just a few images loaded from disk, everything's fine. Once the number of images gets into the dozens, though, scrolling suffers terribly: the scrollview stutters mid-scroll with each new swipe. The only code I've toyed with that comes even close to being reasonably responsive is Three20, but even there the performance doesn't hold a candle to Photos. For now, I'm just using Three20, but a faster, custom solution would definitely be preferable.

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• aspnet_reqsql not working at all

  - by user252160

  I would like to create the ASP.NET User database template on a database of my own, because I'd like to fully untegrate the user system with the rest of my DB. As I've read, i needed to use the aspnet_regsql tool. I put all the options (because my database is running on SQLEXPRESS and is in an mdf file in my project's folder). the program starts and seemingly runs without any errors, however, when I open the database after that, not tables or stored procedures have been added. One more thing: I did one more test. I intentionally gave the -d option a wrong mdf file address, and surprisingly, the program "finished" correctly, yet no file was crated or modified whatsoever.

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• Disable JavaScript on window.open

  - by sonofdelphi

  I have a set of (X)HTML files that I need to open with window.open() from an application homepage. I am able to open these files and read the data within them. function openFiles() { var files = document.querySelectorAll('td a'); //The list of files to scan is stored as links in an HTML table for(var i = 0; i<files.length; i++){ //Open each file in a browser window win = window.open(files[i].href); //Can I prevent the JavaScript in these files from executing? } } But the problem is that the scripts within the HTML files also get executed when opened like this. This is rather time-consuming and unnecessary; also, the scripts within those files may have side-effects. Is there a way to prevent JavaScript from executing on load?

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• How can I return a sql select into a sql variable

  - by Matt

  Hi, I'm trying to put the results of a SELECT into a variable and loop through the results to manipulate that data, all in the same stored proceedure... Here's what I have so far: DECLARE @i int @Result = (SELECT * FROM UserImport) SET @i = 0 WHILE @i < (SELECT Count(@Result) As Count) BEGIN /* Do Stuff */ END I know I'm way off because it's saying @Result was not declared, but I'm not sure how to declare a variable to be able to hold the results of a SELECT statement. Can anyone tell me where i'm going wrong and how to fix it? Thanks, Matt

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• Delphi 2010: whatever happened to TRTTIConstructor?

  - by conciliator

  I've got two questions (of which at least one is regarding RTTI in D2010 and dynamic instancing) I was reading what appears to be the foils for a conference talk by Barry Kelly, and found on p. 13 something that looked really interesting: TRTTIConstructor.Invoke. In an adjacent bullet point, on finds "Dynamically construct instances without needing virtual constructors and metaclasses". This seems like a great feature (and exactly what I need, btw)! However, when I look in the D2010 docs (ms-help://embarcadero.rs2010/vcl/Rtti.html), I can't find it. Did it get revoked? What is the minimal way of creating an instance of a class, provided the class name is stored in a string?

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• Unable to read values from Nested SortedDictionary in C#

  - by Yogi

  HI I am using nested SortedDictionary in my code as SortedDictionary<string, SortedDictionary<string, int>> but not able to use value stored in this object. Please find the code which i am using SortedDictionary<string, SortedDictionary<string, int>> baseItemCounts = new SortedDictionary<string, SortedDictionary<string, int>>(); baseItemCounts.Add("1450", new SortedDictionary<string, int>()); baseItemCounts["1450"].Add("1450M", 15); I want to print these values on screen. but don't know how to access it. 1450 1450M ==== 15 Please some one can help?

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• Java object caching, which is faster, reading from a file or from a remote machine?

  - by Kumar225

  I am at a point where I need to take the decision on what to do when caching of objects reaches the configured threshold. Should I store the objects in a indexed file (like provided by JCS) and read them from the file (file IO) when required or have the object stored in a distributed cache (network, serialization, deserialization) We are using Solaris as OS. ============================ Adding some more information. I have this question so as to determine if I can switch to distributed caching. The remote server which will have cache will have more memory and better disk and this remote server will only be used for caching. One of the problems we cannot increase the locally cached objects is , it stores the cached objects in JVM heap which has limited memory(using 32bit JVM). ======================================================================== Thanks, we finally ended up choosing Coherence as our Cache product. This provides many cache configuration topologies, in process vs remote vs disk ..etc.

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• JavaScript data formatting/pretty printer

  - by Dan

  I'm trying to find a way to 'pretty print' a JavaScript data structure in a human-readable form for debugging. I have a rather big and complicated data structure being stored in JS and I need to write some code to manipulate it. In order to work out what I'm doing and where I'm going wrong, what I really need is to be able to see the data structure in its entirety, and update it whenever I make changes through the UI. All of this stuff I can handle myself, apart from finding a nice way to dump a JavaScript data structure to a human-readable string. JSON would do, but it really needs to be nicely formatted and indented. I'd usually use Firebug's excellent DOM dumping stuff for this, but I really need to be able to see the entire structure at once, which doesn't seem to be possible in Firebug. Any suggestions welcome, thanks in advance.

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• Working with images in WCF

  - by hgulyan

  Hi, I have a desktop application that needs to upload/download images to/from service computer over TCP Protocol. At first, I stored images in file system, but I need to in MS SQL DB to compare which solution is better. Number of images is over half a million. I don't know yet will there be any limitation on size of a photo. If you have done smth like that, please, write what your opinion upon this question. Which one is faster, more safe? Which of them works better with this number of photos? If I'll store on DB, do I need to store images apart from all other tables which I use for my application and which type works better - image or varbinary on DB?..and so on. Thank you.

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• Read only particular fields from CSV File in vb.net

  - by fireBand

  Hi, I have this code to read a CVS file. It reads each line, devides each line by delimiter ',' and stored the field values in array 'strline()' . How do I extract only required fields from the CSV file? For example if I have a CSV File like Type,Group,No,Sequence No,Row No,Date (newline) 0,Admin,3,345678,1,26052010 (newline) 1,Staff,5,78654,3,26052010 I Need only the value of columns Group,Sequence No and date. Thanks in advance for any ideas. Dim myStream As StreamReader = Nothing ' Hold the Parsed Data Dim strlines() As String Dim strline() As String Try myStream = File.OpenText(OpenFile.FileName) If (myStream IsNot Nothing) Then ' Hold the amount of lines already read in a 'counter-variable' Dim placeholder As Integer = 0 strlines = myStream.ReadToEnd().Split(Environment.NewLine) Do While strlines.Length <> -1 ' Is -1 when no data exists on the next line of the CSV file strline = strlines(placeholder).Split(",") placeholder += 1 Loop End If Catch ex As Exception LogErrorException(ex) Finally If (myStream IsNot Nothing) Then myStream.Close() End If End Try

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• How to automatically change a parameter in Reporting Services when another is changed?

  - by Victor Rodrigues

  I have a 'Product' parameter in my report. Depending on the product the user chooses, it will call the report generator stored procedure from a different data source. Looking at this article, I've found how to do the first part of this solution. I've created two internal parameters, Server and Database, and the connection string will use them to connect to the right database. But I need to set this two parameters when the user chooses a product. How could I do this? (If @Product = X) = @Server = Y, @Database = Z

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• Monolog conversations in SQL Service Broker 2008

  - by hemil

  Hi, I have a scenario in which I need to process(in SQL Server) messages being delivered as .xml files in a folder in real time. I started investigating SQL Service Broker for my queuing needs. Basically, I want the Service Broker to pick up my .xml files and place them in a queue as they arrive in the folder. But, SQL Service Broker does not support "Monolog" conversations, at least not in the current version. It supports only a dialog between an initiator and a target service. I can use MSMQ but then I will have two things to maintain - the .Net Code for file processing in MSMQ and the SQL Server T-SQL stored procs. What options do I have left? Thanks.

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• Android 2.3.3 - Messages: Wrong Status Information in the Conversation Overview

  - by Thomas Hoffmann

  On my HTC Desire Z with Android 2.3.3 I get from time to time the problem, that the status information ist wrong. That means status information says, that there is an unread, unsent or failed SMS, but this SMS is already deleted. Does anybody know, where I can reset this information? It must be stored anywhere in ContentResolver of content://mms-sms/conversations or content://sms/conversations on the thread-level, but I have no idea. Example: After I deleted a number of failed SMS in the non delivered SMS overview, the status of non delivered SMS was not reset in the Messages conversation overview though in each conversation there wasn't any undelivered SMS left.

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• Shell script query

  - by WENzER

  Hi, I am having database. for that i want to get the script of all Store procedure. I have used dba_source table for getting script of Store procedure. Now I want to write a shell script which will give me all the scripts of store procedure in the seperate files. The approach i have applied that first I have written a query which will give the name of all store procedures and I am storing these names in seperate file. Now I am running a loop for getting sript of store procedures by using the names stored in file. All this i am able to do seperatly but not in shell script since I am new to it Please help me Thanks

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• Can I encrypt value in C# and use that with SQL Server 2005 symmetric encryption?

  - by Robert Byrne

  To be more specific, if I create a symmetric key with a specific KEY_SOURCE and ALGORITHM (as described here), is there any way that I can set up the same key and algorithm in C# so that I can encrypt data in code, but have that data decrypted by the symmetric key in Sql Server? From the research I've done so far, it seems that the IDENTITY_VALUE for the key is also baked into the cypher text, making things even more complex. I'm thinking about just trying all the various ways I can think of, ie hashing the KEY_SOURCE using different hash algorithms for a key and trying different ways of encrypting the plain text until I get something that works. Or is that just futile? Has anyone else done this, any pointers? UPDATE Just to clarify, I want to use NHibernate on the client side, but theres a bunch of stored procedures on the database side that still perform decryption.

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• Handling log-in / log-out via Objective-c

  - by squeezemylime

  Having a real problem with this one...Tried using cookies to store variables, etc. but no luck. Writing an iPhone app where the User has to log in. There is an HTTPS call to get the person's userid, which is used practically everywhere else in the app, so that either has to be stored in a global variable or a cookie (for sending messages to other users, etc.) I tried the cookie route, but am having great difficulty storing (and retriving) a user ID in a cookie. The User should be able to then close out of the app and then reboot it and have the app retain their User ID as well, so I'm not sure global variables are necessarily the solution to this. Are there any best practices or suggestions?

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• Materialized Query Table in SQL Server 2005

  - by Azho KG

  In DB2 there is a support for Materialized Query Table (MQT). Basicly you write a query and create a MQT. But the difference from View is that the query is pre-executed and resulting data is stored in MQT and there are some options when to refresh/syncronize the MQT with base tables. I want same functionality in SQL Server. Is there a way to achieve same result? I've tables with millions of rows, and I want to show summary (like total # of members, total expense and etc) in dashboard. So I don't want to count every time user gets to dashboard, instead I want to store them in table and I want that table to be refresh each night. Any kind of hints, answers,suggestions and ideas are welcome. Thanks.

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• Select from table by knowing only date without time (ORACLE)

  - by Abdulrhman

  Greeting People,, I'm trying to retrieve records from table by knowing the date in column contains date and time. let me explain my self clearly with this example: suppose i have table called t1 which contains only two column name, date respectively the data stored in column date like this "8/3/2010 12:34:20 PM" i want to retrieve this record by this query for example: Select * from t1 where date="8/3/2010" // notes i don't put the time. this query give me nothing ! SO now my question is how can i retrieve date by knowing only date without the time !

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• What might cause SQL error Cannot find the object "dbo.InspectionEvents" because it does not exist o

  - by mrtrombone

  Hi My ASP.Net app is periodically getting the error 'Cannot find the object dbo."XXXX" because it does not exist or you do not have permissions' when it tries to execute a specific stored procedure that writes to the database. I have seen a few forum posts about this issue but the strange thing is that the method works fine almost all of the time, just every now and then I see it in my error logs. Can anyone tell me why this might works Ok most of the time but occassionally fire the error? Application is C# using Enterprise Library 4.1 Data Access. Database is SQL Server 2005 Cheers

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• deploying vb.net app with database on server

  - by vbNewbie

  I have an application that accesses a sql server 2008 database. The server and database is stored on my local harddrive and I would like to learn to scale this up to having multiple users in our office access the application which I will i deploy on a server. For now the database will stay on my pc until I am ready to put it on a dedicated server for myself but for now how do I allow the application still to access my database. Here is my current connection string: <add key="ConnectionString" value="Data Source=.;Initial Catalog=SearchEngine;User ID=sa;Password=pss;Trusted_Connection=False;" /> Now I know how to deploy a general vb.net application but what I dont know is what to do with the database. Please help with any advice

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• WCF Runtime Caching

  - by francois

  Hi I'm using the following code to cache objects. HttpRuntime.Cache.Insert("Doc001", _document); HttpRuntime.Cache.Remove("Doc001"); I would like to know were the cache is stored? (On the client PC or the IIS server) Is this a save way of cache objects and by adding and removing cache in this way will it influence any of the other clients, say for instance i've got 2 clients connected and both are storing cache "*HttpRuntime.Cache.Insert("Doc001", _document);*" and one client removes the cache, is it only removed on a client level?

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• What is cached on a client machine when using https.

  - by TroyP

  I have an application that is working on https for everybody and on http for all but two users. The two users get a JavaScript error when trying to "edit" a page while on http but can edit the page on https. The problem is for occurs for both IE6 and FF3.6 for one of these users. Others have no problem using any browser. I have used Charles Proxy to look at the server response and no request is being made to https when on http and all browser requests return successfully. I have cleared all caches known to me on the clients (browser, jvm). Are http and https caches stored in different locations on the clients computers. Could a cached encrypted file be being read on the unencrypted port.

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• What should I consider when deploying a new web farm?

  - by tsilb

  My web app has been chugging along just great in Production for years with one App server and one Web server. Now we're moving to a multi-server environment with 2 App and 3 Web servers. I have enough time to make changes before the go-live. As a Developer, what considerations should I take into account from coding, deployment, and architectural/ecosystem management perspectives? Already on my list: Remove tight-coupling between servers Applicable files (i.e. downloadables) stored in IMAGE fields in SQL instead of files on app server Deployment: Take out node out of the farm at a time

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• Logical python question - handling directories and files in them

  - by Konstantin

  Hello! I'm using this function to extract files from .zip archive and store it on the server: def unzip_file_into_dir(file, dir): import sys, zipfile, os, os.path os.makedirs(dir, 0777) zfobj = zipfile.ZipFile(file) for name in zfobj.namelist(): if name.endswith('/'): os.mkdir(os.path.join(dir, name)) else: outfile = open(os.path.join(dir, name), 'wb') outfile.write(zfobj.read(name)) outfile.close() And the usage: unzip_file_into_dir('/var/zips/somearchive.zip', '/var/www/extracted_zip') somearchive.zip have this structure: somearchive.zip 1.jpeg 2.jpeg another.jpeg or, somethimes, this one: somearchive.zip somedir/ 1.jpeg 2.jpeg another.jpeg Question is: how do I modify my function, so that my extracted_zip catalog would always contain just images, not images in another subdirectory, even if images are stored in somedir inside an archive.

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