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• glBlendFunc() with 32-bit RGBA textures

  - by oldSkool

  I have a texture that is semi-transparent with varying opacity at different locations. I have the main texture bitmap, and a mask bitmap. When the program executes, the alpha values from the mask bitmap are loaded into the alpha values of the main texture bitmap. The areas that I want to be transparent have a value of 255 alpha, and the areas that I want to remain totally opaque have values of 0 alpha. There are in-between values also for mid-transparency. I have tried all manner of glBlendFunc() settings, but it is either completely invisible or it acts on the RGB colors of the source texture. Any help out there?

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• WCF interoperability with WSDL proxy and performance consideration advise.

  - by user194917

  I'm essentially writing a broker service. The requirement is that I write an API that acts as an intermediary broker between our in-house developed services and a 3rd party provided API. The intention being that my API abstract the actual communication with the 3rd party API from our internal systems. The architect on the project chose WCF as the communication framework. The problem is that 70 percent of our subscriber applications are written in .Net 2 and as such have no access to the class libraries required to implement a WCF proxy. The end result being that our proxy classes are loosely based on the code auto generated by the WSDL tool as opposed to the SvcUtil tool. My question is, although I have no issues implementing the required proxy classes using basicHttp as the actual binding and using the WSDL tool, are there any special considerations that I need to take into account in this scenario? I.E proxy optimizations and the like. Thanks in advance.

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• How to know from a bash script if the user abruptly closes ssh session

  - by Figo

  I have a bash script that acts as the default shell for a user loging in trough ssh. It provides a menu with several options one of wich is sending a file using netcat. The netcat of the embedded linux I'm using lacks the -w option, so if the user closes the ssh connection without ever sending the file, the netcat command waits forever. I need to know if the user abruptly closes the connection so the script can kill the netcat command and exit gracefully. Things I've tried so far: Trapping the SIGHUP: it is not issued. The only signal issued i could find is SIGCONT, but I don't think it's reliable and portable. Playing with the -t option of the read command to detect a closed stdin: this would work if not for a silly bug in the embedded read command (only times out on the first invocation)

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• Searching in Rails 3

  - by cbarton

  Here is the situation: I have the need to search for specifics or generals, much like expedia.com or your local library catalog search. In that there are fields that may or may not be filled out based on the individual need. It acts much like an "advanced search page". I have all of that code done for the models/controller and such and have it setup with a Searches controller along with matching model and views. The question that I have is there a way to cut down the amount of parameters posted to GET so that the url isn't search?search[:a]=""+search[:b]=""+search[:c]="x"... plus the unicode checkmark. I only want the filled out fields to be shown in the response link especially minus the checkmark. cbarton

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• What is this Hash-like/Tree-like Construct Called?

  - by viatropos

  I want to create a "Config" class that acts somewhere between a hash and a tree. It's just for storing global values, which can have a context. Here's how I use it: Config.get("root.parent.child_b") #=> "value" Here's what the class might look like: class Construct def get(path) # split path by "." # search tree for nodes end def set(key, value) # split path by "." # create tree node if necessary # set tree value end def tree { :root => { :parent => { :child_a => "value", :child_b => "another value" }, :another_parent => { :something => { :nesting => "goes on and on" } } } } end end Is there a name for this kind of thing, somewhere between Hash and Tree (not a Computer Science major)? Basically a hash-like interface to a tree.

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• Why Solr admin query page interprets UTF-8 as ISO-8859-1

  - by Scott Chu

  I deploy a war to my Tomcat 6.0.35 on Win7 64bit and when I use full-interface query page (I mean form.jsp) in Solr Admin to query 2 Chinese character (say it's C1C2) , the debug info shows: <lst name="debug"> <str name="rawquerystring">æ°è</str> <str name="querystring">æ°è</str> <str name="parsedquery">NEWSID:æ°è</str> <str name="parsedquery_toString">NEWSID:æ°è</str> ... You can see C1C2 becomes æ°è. I deploy same war file to Tomcat on Linux or on another Win7 64bit of my colleagues' computer, the encoding acts well. Does anyone know why and how can I avoid this problem? Thanks in advance!

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• Wrong Editing Controls Displayed in UITableView

  - by CJC

  Hi all, I'm having a strange problem with UITableView. When the user taps the Edit button, the tableview (which is a grouped view with multiple sections) is supposed to show delete buttons for each row--except for the final row in each section, which has a green add button. When a user taps the green button, a new row is inserted, but now the final row gets a delete button. Even stranger, that delete button ACTS like an add button. So it seems there's a drawing glitch, rather than a problem in assigning the correct style. (Extensive NSLogging shows that the last cell is getting the Insert editing style correctly.) I've tried setting setNeedsDisplay on the cell and the tableView, I've tried reloading that section/row/the entire table, but the issue persists. Any ideas on how to get UITableView to explicitly redraw the editing controls?

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• any open source instant messenger?

  - by George2

  Hello everyone, I need to develop an instant messenger (like MSN Messagner, but only simple and basic function is fine), based on .Net (C#). I want to integrate the instant messenger with my current web site user. I want to know any open source (better C#) instant messenger to reference? BTW: some of the users are using internal IP address (behind a gateway or proxy, like 10.10.xxx.xxx) -- so in this scenario two users can not use point to point message transfer if both of them are behind a gateway? And I think I have to develop a server which acts as an intermediate party to transfer message between two users, correct? thanks in advance, George

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• Problems with system() calls in Linux

  - by Thomas

  I'm working on a init for an initramfs in C++ for Linux. This script is used to unlock the DM-Crypt w/ LUKS encrypted drive, and set the LVM drives to be available. Since I don't want to have to reimplement the functionality of cryptsetup and gpg I am using system calls to call the executables. Using a system call to call gpg works fine if I have the system fully brought up already (I already have a bash script based initramfs that works fine in bringing it up, and I use grub to edit the command line to bring it up using the old initramfs). However, in the initramfs it never even acts like it gets called. Even commands like system("echo BLAH"); fail. So, does anyone have any input?

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• Creating a jQuery Plugin, How do I do Custom Scopes?

  - by viatropos

  I would like to create a jQuery plugin with an API something like this: $("#chart").pluginName().attr("my_attr"); Instead of these: $("#chart").pluginName_attr("my_attr"); $.pluginName.attr("#chart", "my_attr"); Basically, instead of having to namespace every method that acts similar to ones in jQuery, I'd like to "scope" the methods to a custom api, where $("#chart).pluginName() would return an object such that get, attr, find, and a few others would be completely rewritten. I'm sure this is not a well-liked idea as it breaks convention (does it?), but it's easier and more readable, and probably more optimized, than the two options above. What are your thoughts?

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• Chaining Many-To-Many Dimensional Relationships in SSAS

  - by Ray Saltrelli

  I'm developing a cube in SSAS and attempting to model the following relationships: Many Facts to 1 Customer Many Customers to Many Sales Reps Many Sales Reps (Subordinates) to Sales Reps (Managers) Each M2M relationship is facilitated by a bridge table which also acts as a fact table in the cube I have most of this working. I can slice Facts by Customer and by Sales Rep (Subordinate), but when I add Sales Rep (Manager) to the query it appears to return every subordinate/manager combination regardless of whether or not that relationship exists in the bridge table. Any ideas as to what I might be doing wrong?

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• jquery updating a div in ajax diesnt work properly, when using a variable

  - by maschek

  hi, i got the following code var zieldiv = $(this).attr(\'id\'); $.ajax({ url: \'index.php?params\', type: \'POST\', data: { color:thenewcolor, zieldiv:zieldiv }, timeout: 50000, beforeSend: function() { $("#" + zieldiv).css({background: "#" + thenewcolor} ); } }); I use this for dragging a small div into a bigger div. the variable at the beginnning would give out the string "test1". So in the ajax.thing the css of a div which matches the var zieldiv should be updatet. Problem is, if i would place a string instead a var into the $(...) like $("#test1") it acts like its supposed to, the #test1 gets updated. but if i use the var $("#" + zieldiv) the parent div, which is surrounding the #test1-div gets updated. but i know for sure the var zieldiv contains the string "test1", because when passing it to php it contains "test1". so i think this is a little strange. do you have any ideas? thanx, maschek

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• How to find which method makes my iPhone app slow ?

  - by Stewart Hou

  Currently I am working on a production app. One function acts like the settings.app on iPhone. When the user click a cell of a tableView, as shown below http://www.penguintech.net/images/stackoverflow/1.png It will push another view, which includes a textfield to let user input something. However, on both simulator and device, after the app just loaded, the delay between clicking and showing the second view takes around 2 seconds. Then if user get back to previous view and click again, it will be no delay at all. To detect which method makes the delay, I put a NSLog() in every involved methods, but when I was inspecting the console while running the app, all NSLog() message showed in 0.1 seconds, and then still a delay on the app. Is there any other way to trace the performance footage of a app? The Instruments shows only CPU usage in Mac OS not in iPhone.

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• Erase part of RenderTarget when drawing primitives?

  - by user1495173

  I'm creating a paint like application using XNA. I have a render target which acts as a canvas. When the user draws something I draw corresponding triangles using DrawUserPrimitives and triangle strips to make lines and other curves. I want to implement an eraser in the application, so that the user can erase the triangles from the texture. I've used OpenGL in the past and there I would just use a blend function like so: glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_ALPHA); How would I do this in XNA? I tried setting the GraphicsDevice blend mode to AlphaBlend, Additive, etc.. but it did not work. Any ideas? Thanks!

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• deleting a file in java while uploading it in other thread

  - by user369507

  i'm trying to build a semi file sharing program, when each computer acts both as a server and as a client. I give multiple threads the option to DL the file from my system. also, i've got a user interface that can recieve a delete message. my problem is that i want that the minute a delete message receieved, i wait for all the threads that are DL the file to finish DL, and ONLY than excute file.delete(). what is the best way to do it? I thought about some database that holds and iterate and check if the thread is active, but it seems clumsy. is there a better way? thanks

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• Wordpress sidebar border

  - by Crays

  Hi, i would like to add an image that acts like a border after every list in the sidebar. I knew it has something to do with this #sidebar h2 { border-bottom: 1px solid #d6d6d6; } since i tried that code and a border appeared. But what i wanted is a picture, i could do that with in the posts with: .TitleBorder { background: url(images/border.png) repeat-x; height: 3px; width: 615px; } and <div class="TitleBorder"></div> but in sidebar, i can't do that. Any help?

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• how can I add a new action to a controller?

  - by Angela

  I used the following in routes to add a new action to my Email controller: map.resources :emails, :member => { :newfwd => :put} The expected result was that newfwd_email_path(:id = 1) would generate the following urL: emails/1/newfwd It does. But I get an error, it treats '1' as an action and 'newfwd' as an id. I want '1' to be interpreted as the id for emails, upon which the newfwd action acts. I'm not sure what I'm doing wrong. (Note: I am using Rails 2.3.8)

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• Do programmable Ethernet devices (think onboard CPU) really exist?

  - by PeterM

  I've heard from various people that programmable Ethernet cards exist and are easily available. However I have yet to be able to track down one of these mythical devices so I'm wondering if they're just that - a myth. Such a programmable card has a gigabit Ethernet interface, has a programmable CPU and connects to the host system via PCI Express. The problem area these cards address are low latency network applications where the card itself does the work and "reports back" to the operating system. Basically the card acts as a co-processor and handles all the low latency requirements on the card, thus avoiding the issues of writing low latency code in user-land - think 0.4ms - 0.5ms response times. So my question is, do these cards really exist and if so, where can I get my hands on one?

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• How to let users with required permission download a file via php?

  - by Yegor

  I have a php file that acts as a gatekeeper for all the files I want people to download, who ahve sufficient privilages. The code I use throw the file to the user is header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header("Content-disposition: attachment; filename=\"".$public_filename."\""); header("Content-Transfer-Encoding: Binary"); header('Expires: 0'); header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); header('Pragma: public'); header("Content-length: ".$f_filesize); readfile($file_path); Most files are fairly large.... 400mb-10GB. What would be a good way to do this, and keep the true locations + filenames secret, so people cant just link to the files directly, but HAVE to link thru my download.php?file=ID gatekeeper? Thanks

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• Caching Models in rails

  - by jules

  I have a rails application, with a model that is a kind of repository. The records stored in the DB for that model are (almost) never changed, but are read all the time. Also there is not a lot of them. I would like to store these records in cache, in a generic way. I would like to do something like acts_as_cached, but here are the issue I have: I can not find a decent documentation for acts as cached (neither can I find it's repository) I don't want to use memcached, but something simpler (static variable, or something like that). Do you have any idea of what gems I could use to do that ? Thanks

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• Record Name field in DNS responce

  - by Lescott

  I just read about DNS protocol, and found, that the name field can be writen in two ways: lenght of the next label the label lenght of the next label the label ... zero-byte pointer to the previous name field Next is the original article fragment: The Resource Record Name field is encoded in the same way as the Question Name field unless the name is already present elsewhere in the DNS message, in which case a 2-byte field is used in place of a length-value encoded name and acts as a pointer to the name that is already present. So, my question is, how can I determine the first or the second way is using in a package?

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• WPF input datagrid?

  - by SAD

  I would like to create an input DataGrid - an empty set of rows with the column headers that can be filled with data by a user and then saved to a database. The DataGrid will not be therefore used to display data but acts like an input field. The behaviour would be similar to the one of Excell. The problem is that if the DataGrid has no data provided for it, it is not visible in the application and the user cannot enter anything. Is the DataGrid a good choice? How can this sort of functionality be implemented with a different control? I would prefer to use the DataGrid tough. Thanks a lot for any help on this.

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• How can Domain driven design be combined with aspect oriented programming?

  - by anthares

  I'm doing research and one point I want to cover is "What is the relationship between Domain-driven Design and Aspect oriented programming?" I know that a main principle in DDD is separation of concerns and I understand that. What I'm not really certain is, whether aspects in AOP acts like "sub domains" in our domain in DDD. Are these two concepts, basically the same thing. I mean, If I develop an application following AOP and DDD, at the end of the day will it be true that "a sub domain" == "an aspect". I will also appreciate any other opinions what is the common between AOP and DDD.

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• Union - Same table, excluding previous results MySQL

  - by user82302124

  I'm trying to write a query that will: Run a query, give me (x) number of rows (limit 4) If that query didn't give me the 4 I need, run a second query limit 4-(x) and exclude the ids from the first query A third query that acts like the second I have this: (SELECT *, 1 as SORY_QUERY1 FROM xbamZ where state = 'Minnesota' and industry = 'Miscellaneous' and id != '229' limit 4) UNION (SELECT *, 2 FROM xbamZ where state = 'Minnesota' limit 2) UNION (SELECT *, 3 FROM xbamZ where industry = 'Miscellaneous' limit 1) How (or is?) do I do that? Am I close? This query gives me duplicates

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• Prevent Apache from answering invalid requests

  - by nickdnk

  I have an Apache web-server that acts as a web front-end for iPhone and iPad applications that communicate by POST and JSON only. Is there any way to prevent Apache from answering requests that are invalid? I can see my error log is filled with attempts to open files such as /admin.php /index.php etc - files that don't exist on my server. I believe this is possible with IIS, but can you do the same thing with Apache? Basically I want the request to appear timed out unless you post exactly the right content to the right file - or at least if you do not request an existing file. This would make the server appear non-existing to everyone but my iPhone users as all communication is SSL and directories are not really guess-able. I did disable the ServerTokens and all that, but I still get File not found etc. when I access the server requesting a random file, which is what these bots do constantly.

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