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• WCF: Callback is not asynchronous

  - by Aquarius

  Hi, I'm trying to program a client server based on the callback infrastructure provided by WCF but it isn't working asynchronously. My client connects to the server calling a login method, where I save the clients callback channel by doing MyCallback callback = OperationContext.Current.GetCallbackChannel() After that the server does some processing and uses the callback object to communicate with the client. All this works, the problem resides on the fact that even though I've set the method in the OperationContract as IsOneWay=true, the server still hangs when doing the call to the client. I've tested this by launching the server for debug in the visual studio, detaching it, launching the client, calling the above mentioned login method, putting a break point in the implemented callback method of the client, and making the server send a response to the client. The server stops doing what it's supposed to do, waiting for the response of the client. Any help is appreciated.

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• Choose item from a list with bias?

  - by ooboo

  Given a list of items x1 ... xn and associated probabilties p1 ... pn that sum up to 1 there's a well known procedure to select a random item with its associated proabability by sorting the list according to weight, choosing a random value between 1 and 0, and adding up to a culmination sum until it exceeds the value selected and return the item at this point. So if we have x1 - 0.5, x2 - 0.3, x3 - 0.2, if the randomly chosen value is less than 0.5 x1 will be chosen, if between 0.5 and 0.8, x2, and else x3. This requires sorting so it needs O(nlogn) time. Is there anything more efficient than that?

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• Best way to do syntax highlighting in GTK+?

  - by Tyler

  I was wondering if someone could point me to an example of (or just their thoughts on) the best way to code syntax highlighting in a C-based GTK+ application. I know that I can use the GtkTextTag to modify text in a GtkTextBuffer but beyond searching out keywords (iteratively or by regexing the string) is there a better way? My only concern is that if I wipe all of the tags and then re-search and apply the tags at every text change event it could really bog down my application. As always thanks for your help!

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• How to use git feature branches with live updates and merge back to master?

  - by karlthorwald

  I have a production website where master is checked out and a development webiste where I develop in feature branches. When a feature is merged into master I do this on the development site: (currently on the new-feature branch) $ git commit -m"new feature finished" $ git push $ git checkout master $ git merge new-feature $ git push And on the production site: (currently on master branch) $git pull This works for me. But sometimes the client calls and needs a small change on the website quickly. I can do this on production on master and push master and this works fine. But when I use a feature branch for the small change I get a gap: (On production on branch master) $ git branch quick-feature $ git checkout quick-feature $ git push origin quick-feature $ edit files... $ git add . $ git commit -m"quick changes" $ git push # until this point the changes are live $ git checkout master #now the changes are not live anymore GAP $ git merge quick-feature # now the changes are live again $ git push I hope I could make clear the intention of this workflow. Can you recommend something better?

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• How do i plot a vertical axis with variable intervals (Flex Charts or any other)

  - by satish

  How do i plot a vertical axis with variable intervals? on a Flex Chart. I want to plot a data set that has values from 0.1 to 800. When I use a standard Numerical Axis, I have to define a interval. I tried using Log-Axis, but I am not sure how to plot the point values. Looks like something in lines of semi-log axis would be better. A axis with initial values in Numerical, but later shifting gears to a Log-Axis. Any ideas or pointers to implement this in Flex?

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• Best way to globally set every control's ValidationGroup property in an asp.net?

  - by Steve Flook

  I have a User Control with form items that is re-used considerably throughout a large web application, and up until this point the validation summary upon an invalid form submission is being handled by the .aspx that consumes the User Control. Now I need to set the ValidationGroup property at runtime for each of my form items controls (textboxes, lists, validators, etc). Rather than do it manually by setting each control I'm interested in iterating through all the controls in the User Control, detecting if that control has a ValidationGroup property, and setting it's value that way. Something like this: For Each ctrl As System.Web.UI.Control In Me.Controls ' so now what is the proper way to detect if this control has the ValidationGroup property Next Code sample in vb.net or c# works for me. Many thanks!

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• Querying a perimeter around a Geocode-Location (Lat/Lon)

  - by Tim

  Hi, how can I search for geo-objects in a certain perimeter ? E.g. I have several objects with Lat/Lon coordinates stored in my DB. Now I want to retrieve all the objects which lie in a specific perimeter (10 miles or 20 miles) around a given point. I guess what I would have to do is to form some query like: SELECT * FROM objects o where o.lat < (myPositionLat+x) AND o.lon < (myPositionLon+y) Is this right? How do I determine/set the values for x and y?

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• How to get all n sets of three consecutives elements in an array or arraylist with a for statement ?

  - by newba

  Hi, I'm trying to do a convex hull approach and the little problem is that I need to get all sets of three consecutive vertices, like this: private void isConvexHull(Ponto[] points) { Arrays.sort(points); for (int i = 0; i <points.length; i++) { isClockWise(points[i],points[i+1],points[i+2]); } //... } I always do something that I don't consider clean code. Could please help me find one or more ways to this? I want it to be circular, i.e., if my fisrt point of the a set is the last element in the array, the 2nd element will be the 3rd in the list and the 3rd in that set will be the the 2nd element in the list, and so on. They must be consecutive, that's all.

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• Loading remote video (MP4) with SWFObject

  - by Reddy S R

  On my webpage I have a swfobject, from Camtasia, that loads mp4 data through FlashVars like this: <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="640" height="498" id="csSWF"> ... <param name="flashvars" value="autostart=false&content=funny.mp4&color=0x000000,0x000000" /> This works fine when the mp4 is on the same server(, and as a file). But when the file is residing on another server, the problem creeps in. Below is how I modify the flashvars. <param name="flashvars" value="autostart=false&content=http://myxyzsite.com/Private/Media/funny.mp4&color=0x000000,0x000000" /> This article explains how to load files from another server. When I point to this URL (http://myxyzsite.com/Private/Media/funny.mp4) in my browser directly, Open/Save dialog box is popped up. So the file exists. Should I set any HTTP headrs, say Content-Disposition to Attachment?

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• Trying to figure out how to check a checksum

  - by rross

  I'm trying to figure out how to check a checksum. My message looks like this: 38 0A 01 12 78 96 FE 00 F0 FB D0 FE F6 F6 being the checksum. I convert the preceding 12 sets in to binary and then add them together. Then attempt a bitwise operation to apply the 2s complement. I get a value of -1562, but I can't convert it back to hex to check if the value is correct. Can someone point me in the right direction? my code: string[] hexValue = {"38", "0A", "01", "12", "78", "96", "FE", "00", "F0", "FB", "D0", "FE"}; int totalValue = 0; foreach(string item in hexValue) { totalValue += Int32.Parse(item, NumberStyles.HexNumber); } int bAfter2sC = ~totalValue + 1; Console.Write("answer :" + bAfter2sC + "\n");

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• RSS-Feed or XML-Stream?

  - by Maenny

  HI Folks, I am programming a website for online-reservation-management, preferably for holiday homes. I want to implement a service, which allows the user to pass all their occupation dates to other websites. My question is, what would be the most professional way to do this? Generate a XML-stream Create a valid RSS Feed I think that a XML file has the advantages of being straight to the point, without any information that noone needs. Webmasters of other websites surely prefer the structure of a simple XML file. On the other hand, when someone without programming knowledge wants to use the RSS-Feed with a feedreader or simply with the browser, it may be user-friendlier to use a RSS-FEED. What so you think, I'm unsure...? Greetz Maenny

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• How can we make a single dimension array to multidimensional Hierarchical ?

  - by Chetan sharma

  I have an single array of Hierarchical categories. Index of the array is the category_id like:: [8846] => Array ( [category_id] => 8846 [title] => Tsting two [description] => Tsting two [subtype] => categories [type] => object [level] => 2 [parent_category] => 8841 [tags] => new [name] => Tsting two ) each value has its parent_category value, I have around 500 elements in the array, what is the best way to make it. Process i followed: krsort categories array, so that all the child categories are at the beginning, then function makeHierarchical() { foreach($this->categories as $guid => $category) { if($category['level'] != 1) $this->multilevel_categories[$category['parent_category']][$guid] = $category; } } but this is not working, it does it only for first level. Can someone point out me the error.

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• Sort/Enumerate an NSArray from somewhere in the middle?

  - by Kenny Winker

  I have an NSArray, with objects ordered like so: a b c d e f I would like to enumerate through this array in this order: c d e f a b i.e. starting at some point that is not the beginning, but hitting all the items. I imagine this is a matter of sorting first and then enumerating the array, but I'm not sure if that's the best technique... or, frankly, how to sort the array like this. Edit Adding details: These will be relatively small arrays, varying from 3 to 10 objects. No concurrent access. I'd like to permanently alter the sort order of the array each time I do this operation.

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• Need help in translating code from C to Java.

  - by Vuntic

  From this article. Here's the code: float InvSqrt(float x){ // line 0 float xhalf = 0.5f * x; int i = *(int*)&x; // store floating-point bits in integer i = 0x5f3759d5 - (i >> 1); // initial guess for Newton's method x = *(float*)&i; // convert new bits into float x = x*(1.5f - xhalf*x*x); // One round of Newton's method return x; } ...I can't even tell if that's C or C++. [okay apparently it's C, thanks] Could someone translate it to Java for me, please? It's (only, I hope) lines 2 and 4 that are confusing me.

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• Howto read system informations in C++ on windows and linux?

  - by f4

  I need to read system information like cpu/ram/disks usage in C++. Maybe swap, network and process too but that's less important. It has probably been done thousand of times before so I first tried to search for a library. Someone here suggested SIGAR, which seems to fit my needs but is GPL and it is for inclusion in a proprietary product. So it's not an option here. I feel like it's something not that easy to implement, as it'll need testing on several platforms. So a library would be welcome. If you don't know of any library, could you point me in the right direction for both platforms?

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• Silverlight Video Player that plays .MP4 & .FLV

  - by YeahStu

  I am currently using the Silverlight 2 Video Player to stream videos. I have been very pleased with it but it only seems to stream .WMV files. Does anyone know if there is a good Silverlight video player that will stream other types of video files, especially .MP4 & .FLV? I would be happy to use Silverlight 3 if necessary. EDIT: Because I like this player and have not found a great option, I am considering encoding files as I receive them so that they will always be streamed later as a .WMV. Unless I determine a good player (I am considering flash at this point), I will have to go down this road.

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• Xcode 3.1.2 locks up when loading C++ project...?

  - by Stabledog

  I have a project which builds correctly from the command line. On one of my Macs (10.5) running Xcode 3.1.2, I can load it and build it in the Xcode IDE. On my other Mac (same configuration of software), Xcode sometimes loads the project, but always locks up with a spinning beach ball at some point before the build is done. Sometimes this occurs as the project is loaded, sometimes late in the build. I've tried doing a 'clean' on the project, I've tried pulling in the source code fresh from source control. So far, no luck -- I have to kill Xcode and in effect, cannot develop on this particular Mac. I've uninstalled and reinstalled Xcode. Any clues?

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• OpenSSH connection trouble

  - by gnostical

  Hi, I'm trying to use Putty 0.60 to log in to an OpenSSH 5.3 server. Connections with openssh from another Linux server are possible, but Putty fails. Putty's event log tells me "software caused connection abort" right after the DH key exchange, the server log doesn't report anything (set to INFO). I analyzed the traffic with Wireshark and got a whole bunch of "TCP retransmission" and "TCP DUP ACK" after said key exchange. Sometimes I was able to log in, but at some point (usually < 2 min.) the connection froze without any logged messages. Sadly, I didn't capture a trace. The server is my own (Funtoo with genkernel and gentoo-sources 2.6.34), so I may tweak it, but I'd still like to know what causes the error. Any suggestions? Thank you!

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• What about the Sql transaction log

  - by Michel

  Hi, i always thought that the sql transaction log keeps track of all the transactions done in the database so it could help recovering the database file in case of a unexpected power down or something like that So then, in normal usage, when the data is committed and written to disk, it is cleared because all the data is nice and safe in the mdf file. Seeing the ldf file grow and reading some i understand that that is not the case, and it will keep growing, until: you shrink the log. Only at that point all the commited transactions are cleared and the log file is shrinked. I found some sp's who should do this, but also found the theory that you first have to backup the database? That last step doesn't make sense to me, so can anyone tell me of that is correct and if so, why that is?

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• border highlighting loop with jquery

  - by Tek

  I'm having trouble coming up with a loop that changes the border color of an image from black to yellow and yellow to black over x seconds. Then applying an interrupt to the loop when the image gets clicked on. I don't know where to start, can someone point me in the right direction? I think I may be using the wrong tools to properly write this. Here's what I've come up so far, though if there's a better way to write this, do share! for( i = 100; i >= 0; i--) { $("#imgid").css("border-color", 'rgb(' + i + '%,' + i + '%,0)'); } I'm having trouble picturing how I could combine two loops so that I can also count upwards as well so that it will turn into yellow and back to black. I also don't know how to go about controlling the amount of time it takes for that loop to execute and creating an interrupt when #imigid is clicked. Which is where I'm not sure how to write.

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• Eclipse Plugin: Enablement of an Action based on the current selection

  - by Itay

  I am using the org.eclipse.ui.popupMenus extension point for adding a sub-menu whose Action that is bounded to the following class: public class MyAction implements IObjectActionDelegate { private Logic logic = Logic.getInstance(); // Singleton public void setActivePart(IAction a, IWorkbenchPart targetPart) { // Nothing here } public void run(IAction a) { // Do something... } public void selectionChanged(IAction a, ISelection s) { a.setEnabled(logic.isEnabled(s)); } } This action is working correctly in most cases (including the call a.setEnabled() in selectionChanged()). My problem at the very first time my action is being invoked. The selectionChanged method is called only after the menu item has been displayed (and not when the user has made the selection) which means that the call to a.setEnabled() will have no affect. Any ideas on how to make my action receive selectionChanged() notifications even before the fist time it is being invoked?

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• CodeIgniter: Weird echo of $config coming back when I load Email Library

  - by k00k

  Version info: CI version 1.7.2 - PHP 5.3.1 - Apache2 - Mac OSX 10.6.3 For some reason, when I load CI's email library, either in my controller, or in autoload.php, it automatically and immediately echoes the config info like so: $config['protocol'] = 'sendmail'; $config['mailpath'] = '/usr/sbin/sendmail'; $config['charset'] = 'iso-8859-1'; $config['wordwrap'] = TRUE If I autoload the email library in autoload.php, it is echoed before anything else in my source/page. If I call it explicitly within my controller, it's echoed at that exact point. I'm stumped, never seen that before. Any ideas on how to surpress/eliminate?

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• Why a thread is aborted in ASP.NET MVC (again)?

  - by Dario Solera

  Here is what I do in a controller action: create and start a new Thread that does a relatively long processing task (~30 seconds on average, but might be several minutes) immediately return the page response so the user knows processing has started (trivially, a Json with a task ID for polling purposes). At some random point, ThreadAbortException is thrown, so the async task does not complete. The exception is not thrown every time, it just happens randomly roughly 25% of the times. Points to note: I'm not calling Response.End or Response.Redirect - there isn't even a request running when the exception is thrown I tried using ThreadPool and I got the same behavior I know running threads in ASP.NET has several caveats but I don't care right now Any suggestion?

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• How to sanely read and dump structs to disk when some fields are pointers?

  - by bp

  Hello, I'm writing a FUSE plugin in C. I'm keeping track of data structures in the filesystem through structs like: typedef struct { block_number_t inode; filename_t filename; //char[SOME_SIZE] some_other_field_t other_field; } fs_directory_table_item_t; Obviously, I have to read (write) these structs from (to) disk at some point. I could treat the struct as a sequence of bytes and do something like this: read(disk_fd, directory_table_item, sizeof(fs_directory_table_item_t)); ...except that cannot possibly work as filename is actually a pointer to the char array. I'd really like to avoid having to write code like: read(disk_df, *directory_table_item.inode, sizeof(block_number_t)); read(disk_df, directory_table_item.filename, sizeof(filename_t)); read(disk_df, *directory_table_item.other_field, sizeof(some_other_field_t)); ...for each struct in the code, because I'd have to replicate code and changes in no less than three different places (definition, reading, writing). Any DRYer but still maintainable ideas?

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• Is there an easy way to concatenate several lines of text into a string without constantly appending

  - by Marshmellow1328

  So I essentially need to do this: String text = "line1\n"; text += "line2\n"; text += "line3\n"; useString( text ); There is more involved, but that's the basic idea. Is there anything out there that might let me do something more along the lines of this though? DesiredStringThinger text = new DesiredStringThinger(); text.append( "line1" ); text.append( "line2" ); text.append( "line3" ); useString( text.toString() ); Obviously, it does not need to work exactly like that, but I think I get the basic point across. There is always the option of writing a loop which processes the text myself, but it would be nice if there is a standard Java class out there that already does something like this rather than me needing to carry a class around between applications just so I can do something so trivial. Thanks!

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