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• asp:FileUpload not working in UpdatePanel

  - by James123

  asp:FileUpload control is not working in update panel in ascx control. Why? any work around. <span dir="ltr"> <asp:FileUpload ID="InputFile" runat="server" class="ms-fileinput" size="35" /> </span> and also I added <Triggers> <asp:PostBackTrigger ControlID="btnOK" /> </Triggers> Still it is not working.

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• Is it possible for a Perl subroutine to force its caller to return?

  - by Kinopiko

  If I have Perl module like package X; and an object like my $x = X->new (); Inside X.pm, I write an error handler for $x called handle_error, and I call it sub check_size { if ($x->{size} > 1000) { $x->handle_error (); return; } } Is there any way to make handle_error force the return from its caller routine? In other words, in this example, can I make handle_error do return in check_size without actually writing return there?

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• Why flash makes Firefox not to respond

  - by Hasan Gürsoy

  I have a full page flash animation. When this page is open at Firefox and I want to minimize or re-size Firefox screen, minimize button starts to blink and Firefox does not take any action till this tab is closed. There is not too much code in the flash file. What can cause this? Also this could not be related with full page. I saw other flash files doing same thing. As I remember same problem at Daily Motion. When trying to switch tab nothing happens till I stop video or close the tab.

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• VARCHAR does not work as expected in Apache Derby

  - by Tom Brito

  I'm having this same problem: How can I truncate a VARCHAR to the table field length AUTOMATICALLY in Derby using SQL? To be specific: CREATE TABLE A ( B VARCHAR(2) ); INSERT INTO A B VALUES ('1234'); would throw a SQLException: A truncation error was encountered trying to shrink VARCHAR '123' to length 2. that is already answered: No. You should chop it off after checking the meta-data. Or if you don't wanna check the meta-data everytime, then you must keep both your code and database in sync. But thats not a big deal, its a usual practice in validators. but my doubt is: isn't VARCHAR suppose to variate its size to fit the data? What's wrong with apache derby's VARCHAR?

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• Combining prefixes in SSE

  - by Nathan Fellman

  In SSE the prefixes 066h (operand size override) 0F2H (REPNE) and 0F3h (REPE) are part of the opcode. In non-SSE 066h switches between 32-bit (or 64-bit) and 16-bit operation. 0F2h and 0F3h are used for string operations. They can be combined so that 066h and 0F2h (or 0F3h) can be used in the same instruction, because this is meaningful. What is the behavior in an SSE instruction? For instance, we have (ignoring mod/rm for now): 0f 58 -- addps 66 0f 58 -- addpd f2 0f 58 -- addsd f3 0f 58 -- addss But what is this? 66 f2 0f 58 And how about? f2 66 0f 58 Not to mention the following which has two conflicting REP prefixes: f2 f3 0f 58 What is the spec for thse?

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• What is a convenient base for a bignum library & primality testing algorithm?

  - by nn

  Hi, I am to program the Solovay-Strassen primality test presented in the original paper on RSA. Additionally I will need to write a small bignum library, and so when searching for a convenient representation for bignum I came across this [specification][1]: struct { int sign; int size; int *tab; } bignum; I will also be writing a multiplication routine using the Karatsuba method. So, for my question: What base would be convenient to store integer data in the bignum struct? Note: I am not allowed to use third party or built-in implementations for bignum such as GMP. Thank you.

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• What is the best way to limit the amount of text that can be entered into a 'textarea'?

  - by Jesse Taber

  What is the best way to limit the amount of text that a user can enter into a 'textarea' field on a web page? The application in question is ASP .NET, but a platform agnostic answer is preferred. I understand that some amount of javascript is likely needed to get this done as I do not wish to actually perform the 'post' with that amount of data if possible as ASP .NET does have an upper limit to the size of the request that it will service (though I don't know what that is exactly). So maybe the real question is, what's the best way to do this in javascript that will meet the following criteria: -Must work equally well for both users simply typing data and copy/paste'ing data in from another source. -Must be as '508 compliance' friendly as possible.

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• Dynamically setting a log4net property using common.logging

  - by Kyle LeNeau

  Does anyone know if there is an equivalent in Common.Logging (for .Net) to set properties for the log4net factory adapter? I have had great success when just using log4net by doing: <appender name="FileAppender" type="log4net.Appender.RollingFileAppender"> <file type="log4net.Util.PatternString" value="logs\Log_%property{BrokerID}.txt"/> <appendToFile value="false"/> <rollingStyle value="Size"/> <maxSizeRollBackups value="-1"/> <maximumFileSize value="50GB"/> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date %-5level %logger - %message%newline"/> </layout> </appender> and setting the property like:log4net.GlobalContext.Properties["BrokerID"] = 10 The file I end up with the looks like this: Log_(null).txt when using the common.logging to wire up log4net on the fly.

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• Is there a faster alternative to using textures in XNA?

  - by Matthew Bowen

  I am writing a map editing program for a 2D game using XNA. To create a Texture2D for all of the tiles that a map requires takes too long. Are there any alternatives to using textures for drawing with XNA? I attempted to create just one texture per tile set instead of a texture for every tile in a tile set, but there is a limit to the size of textures and I could not fit all the tiles of a tile set into one texture. Currently the program contains all the would-be textures in memory as Bitmap objects. Is there a way to simply draw a Bitmap object to the screen in XNA? I have searched but I cannot find any information on this. This approach would avoid having to create textures altogether, however any tinting or effects I would have to do to the bitmap directly. Any help would be very much appreciated. Thanks

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• Logging Mechanism using memory mapping technique

  - by Tushar

  Just create a mapping of the file of the required size (CreateFileMapping or mmap), write the lines in the buffer and start over when the maximum number is reached. -- Your answer for write-a-circular-file-in-c. I am also writing the LogWriter module. In this caase i am mapping the whole file to the memory using mmap(). I am maintaining the Read and Write pointers.I want to write the log to the file in append mode. Then when logger service is started first time it writes it appends the logs. But when system gets shutdown next time when i run the service it doesn't append the data at the end. I want to maintain the write and read offsets even if system shut down.How to achieve this ..? How to find the how much data is written to the log file. ??

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• Efficient JSON encoding for data that may be binary, but is often text

  - by Evgeny

  I need to send a JSON packet across the wire with the contents of an arbitrary file. This may be a binary file (like a ZIP file), but most often it will be plain ASCII text. I'm currently using base64 encoding, which handles all files, but it increases the size of the data significantly - even if the file is ASCII to begin with. Is there a more efficient way I can encode the data, other than manually checking for any non-ASCII characters and then deciding whether or not to base64-encode it? I'm currently writing this in Python, but will probably need to do the same in Java, C# and C++, so an easily portable solution would be preferable.

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• Temp file that exists only in RAM?

  - by Auraomega

  I'm trying to write an encrpytion using the OTP method. In keeping with the security theories I need the plain text documents to be stored only in memory and never ever written to a physical drive. The tmpnam command appears to be what I need, but from what I can see it saves the file on the disk and not the RAM. Using C++ is there any (platform independent) method that allows a file to exist only in RAM? I would like to avoid using a RAM disk method if possible. Thanks Edit: Thanks, its more just a learning thing for me, I'm new to encryption and just working through different methods, I don't actually plan on using many of them (esspecially OTP due to doubling the original file size because of the "pad"). If I'm totally honest, I'm a Linux user so ditching Windows wouldn't be too bad, I'm looking into using RAM disks for now as FUSE seems a bit overkill for a "learning" thing.

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• How does this ruby custom accessor work

  - by ennuikiller

  So the method below in class_eval dynamically creates accessors for attributes defined at runtime. It can be used, for example, to create configuration objects with attributes read from a config file (and unknown until runtime). I understanding all of it except for the else branch. If I am correct the else branch returns the attribute value (val[0]) if there is one value passed in *val. However the way its written I would expect it to return an array (val) if there is more then one value passed in *var. In particular, if I have something like the following: value = 5 then from reading the code I would expect "#{@value}" to be [=,5]. However "#{@value}" returns 5 and not the array [=,5]. How is this possible? class Module def dsl_accessor(*symbols) symbols.each do |sym| class_eval %{ def #{sym}(*val) if val.empty? @#{sym} else @#{sym} = val.size == 1 ? val[0] : val end end } end end end

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• ASP.NET Error when referencing a code-behind variable

  - by mattgcon

  I have an aspx page that is supposed to reference a code-behind variable but I am receiving an error of "The name [variable] does not exist in the current context" Here is the aspx code <%@ Control Language="C#" AutoEventWireup="true" Inherits="IPAM.Website.Controls.controls_event_header" Codebehind="event_header.ascx.cs" %> <%# strEventLink %> <h3><%# strEventDate %></h3> <%# strLinks %> Here is part of the aspx.cs code declaring those variables: public string strEventLink = ""; public string strEventDate; public string strLinks = ""; Here is the part of the aspx.cs code where it sets those variables: strEventLink = "<h2>" + parent.Name + "</h2>"; strLinks += "<p><font size=\"+1\"><a href=\"" + Page.ResolveUrl("~" + strScheduleLink) + "\"><b>" + strScheduleLinkText + "</b></a></font></p>\n"; strEventDate = ei.DateSpan; Please help me with this problem

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• Is java HashMap.clear() and remove() memory effective?

  - by Shaman

  Consider the follwing HashMap.clear() code: /** * Removes all of the mappings from this map. * The map will be empty after this call returns. */ public void clear() { modCount++; Entry[] tab = table; for (int i = 0; i < tab.length; i++) tab[i] = null; size = 0; } It seems, that the internal array (table) of Entrys is never shrinked. So, when I add 10000 elements to a map, and after that call map.clear(), it will keep 10000 nulls in it's internal array. So, my question is, how does JVM handle this array of nothing, and thus, is HashMap memory effective?

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• How the kernel gives seg. fault for a scenario like this?

  - by bala1486

  I have a doubt in accessing some invalid data. How will the OS cause segmentation fault for a scenario like this? Suppose a date segment has some 100 bytes. This will be mapped and a page table entry will be created. But the page size is 4K. Consider the data segment is aligned with this page boundary. So at first consider accessing a valid data within the 100 bytes. So now the page table entry is in TLB. Next if you try to access some invalid data between the 100 and 4K, the entry is there in page table and will it be allowed to access the invalid data??? Thanks, Bala

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• Branchless memory manager?

  - by Richard Fabian

  Anyone thought about how to write a memory manager (in C++) that is completely branch free? I've written a pool, a stack, a queue, and a linked list (allocating from the pool), but I am wondering how plausible it is to write a branch free general memory manager. This is all to help make a really reusable framework for doing solid concurrent, in-order CPU, and cache friendly development. Edit: by branchless I mean without doing direct or indirect function calls, and without using ifs. I've been thinking that I can probably implement something that first changes the requested size to zero for false calls, but haven't really got much more than that. I feel that it's not impossible, but the other aspect of this exercise is then profiling it on said "unfriendly" processors to see if it's worth trying as hard as this to avoid branching.

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• What happens when Npgsql connection pool reaches Max

  - by ClearCarbon

  Both the name of the connection string parameter and this blog post - http://fxjr.blogspot.co.uk/2010/04/npgsql-connection-pool-explained.html - lead me to believe that Npgsql wont exceed the MaxPoolSize value set in the connection string. However the docs (http://npgsql.projects.postgresql.org/docs/manual/UserManual.html) say "Max size of connection pool. Pooled connections will be disposed of when returned to the pool if the pool contains more than this number of connections. Default: 20" This suggests that the pool can actually grow larger than MaxPoolSize and it is in fact just a level at which Npgsql starts to aggressively remove connections from the pool as soon as they are returned. I've been searching to try and find an answer but I can find out exactly what happens when you reach MaxPoolSize. Anyone else know? edit: I should add we are using Npgsql 2.0.6.0 due to another dependency being supported only up to that version.

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• Change text fields background colour if negative number using Jquery/CSS

  - by Dan C

  Hi, I have the following text input on a budget calculator form which displays the final balance... <tr><td align="right"><b>Balance: &pound;</b></td><td align="left"><input type="text" class="res" name="res" id="res" size="10" readonly="readonly"></td></tr> How do I go about setting the background of the input to red using css and jquery if the value is a negative number? I am sure this is very simple but I have scanned the net looking for a solution for ages. Please can someone help?, my head hurts!

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• Building a case for solr

  - by Midhat

  Our product consists of multiple applications, All using Lucene. 2 of the applications I am involved with have Lucene indexes of about 3 GB and 12GB. Another team is building an application, for which they estimate the LUCENE INDEX size to be close to 1 Terabyte. New documents are added to the indexes every 15 days approx. We do not have any apparent performance issues with the current applications. So my question is SHould we be using Solr now? When should one stop using Lucene and graduate to Solr? Any disadvantages/problems for using Solr? The client applications are made in ASP.Net, but I assume they will be able to use a solr server using solrnet

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• How do i create an array of unequal length arrays?

  - by Faken

  Hello everyone, I need to create a sort of 2D array in which each one of the secondary arrays are of different length. I have a 1D array of known length (which defines the number of arrays to be formed) with each element having a number that denotes the length of the secondary array in that position. Each one of the arrays are fairly large so i don't want to create a one-size-fits-all "fake" 2D heap array to cover everything. How would i go about doing this? Any 2D array I have made before are always rectangular. I'm trying to do this so that i can create some code to dynamically generate threads to split up some workload. Thanks, -Faken

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• How to set the Cell height as dynamically in iPhone?

  - by Pugal Devan

  Hi Friends, In my apps, i have created table view and displayed the images and the labels in the table view. I have downloaded the image and set the image height into the another class, so i have set the image height as delegate value. In my problem is, heightForRowAtIndexPath method is call very earlier and it never calls again. So how i set the cell height depends on the image height? - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { In Console: the height of the image is --------------------------0.000000 the height of the image is --------------------------0.000000 the height of the image is --------------------------0.000000 } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { In Console: the height of the image is --------------------------98.567039 the height of the image is --------------------------300.000000 the height of the image is --------------------------232.288406 } Is any possible to call the heightforRowAtIndexPath method inside the cellForRowAt method. Because i have set the cell frame size and height depends on the image height. So how can i set the cell height depends on the image height?, please guide me. Thanks!

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• 2D World design question

  - by Maciek

  I'm facing a problem which is probably extremely common in game-design. Let's assume that we've got a 2D world The world's size is M x N rect The world may contain some items in it The items have (x,y) coords The world can be browsed via a window that is physically (m x n) large. The browser window can be zoomed in / out The browser window can be panned up/down + left right, while in the extents of the world's rect. How should I go about implementing this? I'm especially concerned about the browser window. Can anyone recommend any good reads ? This is not a homework - it's more of a task which I've set myself to complete.

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• Android FileOutputStream

  - by zaid

  i am attempting to save an image file using "openFileOutput" and then adding that file to my intent with EXTRA_STREAM. but logcat keeps saying that file size is 0, i have the proper permission in my manifest. FileOutputStream fos = openFileOutput("p001.jpg", Context.MODE_WORLD_READABLE); File jpg = getFileStreamPath("p001.jpg"); fos.close(); Intent share = new Intent(android.content.Intent.ACTION_SEND); share.setType("image/jpeg"); share.putExtra(Intent.EXTRA_SUBJECT, "Fail picture"); share.putExtra(Intent.EXTRA_TEXT, "Epic fail!!!"); share.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(jpg)); startActivity(Intent.createChooser(share, "Choose share method."));

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• "Disabling" an HTML table with javascript

  - by Blair Jones

  I've seen this done in a lot of sites recently, but can't seem to track one down. Essentially I want to "disable" an entire panel (that's in the form on an HTML table) when a button is clicked. By disable I mean I don't want the form elements within the table to be usable and I want the table to sort of fade out. I've been able to accomplish this by putting a "veil" over the table with an absolutely positioned div that has a white background with a low opacity (so you can see the table behind it, but can't click anything because the div is in front of it). This also adds the faded effect that I want. However, when I set the height of the veil to 100% it only goes to the size of my screen (not including the scrolling), so if a user scrolls up or down, they see the edge of the veil and that's not pretty. I'm assuming this is typically done in a different fashion. Does anyone have some suggestions as a better way to accomplish this?

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