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• C# Assembly.GetTypes() - ReflectionTypeLoadException

  - by Veskechky

  We implement a plugin framework for our application and load plugin assemblies using Assembly.Loadfrom. We then use GetTypes() and further examine the types with each plugin file for supported Interfaces. A path for the plugins is provided by the user and we cycle through each of the files in the folder to see if it (the plugin) supports our plugin interface. If it does, we create an instance, if not we move onto the next file. We build two versions of software from the one code base (appA_1 and appA_2). Loading the plugins works well when the plugins are loaded by the application that was built at the same time as the plugin file. However if we build appA_2 and point to the plugin folder of appA_1, we get an exception when GetTypes() is called. A basic version of our code is; var pluginAssembly = Assembly.LoadFrom(FileName); foreach (var pluginType in pluginAssembly.GetTypes()) { We get a "ReflectionTypeLoadException" exception. This is concerning because we want our application to be able to load the types of any plugin, built by anyone. Is there something we are missing?

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• RadTabControl and MVVM

  - by Jeff

  First, so you know, Silverlight 4 and VS 2010 both RC and RIA services. I'm also new to Silverlight... I have a page that has a Telerik RadTabControl on it. It will always have six tabs, i.e. the number of tabs is not data driven. The tabs are used for various admin functions. One tab for managing users with a grid and edit view, another that will have basic company info - just a few text boxes on it. The other tabs are similar to these two. I'm trying to use MVVM and can't decide on the best approach. I don't think I want one big ViewModel that handles all six tabs - that would be big, ugly and harder to maintain. Any recommendations for approaches on how to break this out? Perhaps have a ViewModel for each tab? If so, how would I (generally) go about implementing something like that? Or is there another approach that makes more sense? Thanks, Jeff

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• WCF Named Pipe IPC

  - by Peter M

  I have been trying to get up to speed on Named Pipes this week. The task I am trying to solve with them is that I have an existing windows service that is acting as a device driver that funnels data from an external device into a database. Now I have to modify this service and add an optional user front end (on the same machine, using a form of IPC) that can monitor the data as it passes between the device and the DB as well as send some commands back to the service. My initial ideas for the IPC were either named pipes or memory mapped files. So far I have been working through the named pipe idea using WCF Tutorial Basic Interprocess Communication . My idea is to set the Windows service up with an additional thread that implements the WCF NamedPipe Service and use that as a conduit to the internals of my driver. I have the sample code working, however I can not get my head around 2 issues that I am hoping that someone here can help me with: In the tutorial the ServiceHost is instantiated with a typeof(StringReverser) rather than by referencing a concrete class. Thus there seems to be no mechanism for the Server to interact with the service itself (between the host.Open() and host.Close() lines). Is it possible to create a link between and pass information between the server and the class that actually implements the service? If so, how? If I run a single instance of the server and then run multiple instance of the clients, it seems that each client gets a separate instance of the service class. I tried adding some state information to the class implementing the service and it was only retained within the instance of the named pipe. This is possibly related to the first question, but is there anyway to force the named pipes to use the same instance of the class that is implementing the service? Finally, any thoughts on MMF vs Named Pipes? Thanks for you help

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• Logging in worker threads spawned from a pylons application does not seem to work

  - by TimM

  I have a pylons application where, under certain cirumstances I want to spawn multiple worker threads to process items in a queue. Right now we aren't making use of a ThreadPool (would be ideal, but we'll add that in later). The main problem is that the worker threads logging does not get written to the log files. When I run the code outside of the pylons application the logging works fine. So I think its something to do with the pylons log handler but not sure what. Here is a basic example of the code (trimmed down): import logging log = logging.getLogger(__name__) import sys from Queue import Queue from threading import Thread, activeCount def run(input, worker, args = None, simulteneousWorkerLimit = None): queue = Queue() threads = [] if args is not None: if len(args) > 0: args = list(args) args = [worker, queue] + args args = tuple(args) else: args = (worker, queue) # start threads for i in range(4): t = Thread(target = __thread, args = args) t.daemon = True t.start() threads.append(t) # add ThreadTermSignal inputData = list(input) inputData.extend([ThreadTermSignal] * 4) # put in the queue for data in inputData: queue.put(data) # block until all contents are downloaded queue.join() log.critical("** A log line that appears fine **") del queue for thread in threads: del thread del threads class ThreadTermSignal(object): pass def __thread(worker, queue, *args): try: while True: data = queue.get() if data is ThreadTermSignal: sys.exit() try: log.critical("** I don't appear when run under pylons **") finally: queue.task_done() except SystemExit: queue.task_done() pass Take note, that the log lin within the RUN method will show up in the log files, but the log line within the worker method (which is run in a spawned thread), does not appear. Any help would be appreciated. Thanks ** EDIT: I should mention that I tried passing in the "log" variable to the worker thread as well as redefining a new "log" variable within the thread and neither worked. ** EDIT: Adding the configuration used for the pylons application (which comes out of the INI file). So the snippet below is from the INI file. [loggers] keys = root [handlers] keys = wsgierrors [formatters] keys = generic [logger_root] level = WARNING handlers = wsgierrors [handler_console] class = StreamHandler args = (sys.stderr,) level = WARNING formatter = generic [handler_wsgierrors] class = pylons.log.WSGIErrorsHandler args = () level = WARNING format = generic

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• Android app resets on orientation change, best way to handle?

  - by Anthony Westover

  So I am making a basic chess app to play around with some various elements of android programming and so far I am learning a lot, but this time I am lost. When the orientation of the emulator changes the activity gets reset. Based on my research the same thing will happen anytime the application is paused/interrupted, ie. keyboard change, phone call, hitting the home key etc. Obviously, it is not viable to have a chess game constantly reset, so once again I find myself needing to learn how to fix this problem. My research brings up a few main things, overriding the onPaused method in my Activity, listening for Orientation, Keyboard changes in my manifest (via android:configChanges), using Parcelables, or Serialization. I have looked up a lot of sample code using Pacelables, but to be honest it is too confusing. Maybe coming back tomorrow with fresh eyes will be beneficial, but right now the more I look at Parcelables the less sense it makes. My application utilizes a Board object, which has 64 Cell Objects(in an 8x8 2D array), and each cell has a Piece Object, either an actual piece or null if the space is empty. Assuming that I use either Parcelable or Serialization I am assuming that I would have to Parcelize or Serialize each class, Board, Cell, and Piece. First and foremost, is Parcelable or Serialization even the right thing to be looking at for this problem? If so is either Parcelable or Serializable preferred for this? And am I correct in assuming that each of the three objects would have to be Parceled/Serialized? Finally, does anybody have a link to a simple to understand Parcelable tutorial? Anything to help me understand, and stop further headaches down the road when my application expands even further. Any help would be appreciated.

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• Using .NET's HttpWebRequest to download a multitude of files in a row

  - by Cornelius

  I have an application that needs to download several files in a row in succession (sometimes a few thousand). However, what ends up happening when several files need to be downloaded is I get an exception with an inner exception of type SocketException and the error code 10048 (WSAEADDRINUSE). I did some digging and basically it's because the server has run out of sockets (and they are all waiting for 240s or so before they become available again) - not coincidentally it starts happening around the 1024 file range. I would expect that the HttpWebRequest/ServicePointManager would be reusing my connection, but apparently it is not (and the files are https, so that may be part of it). I never saw this problem in the C++ code that this was ported from (but that doesn't mean it didn't ever happen - I'd be surprised if it was, though). I am properly closing the WebRequest object and the HttpWebRequest object has KeepAlive set to true by default. Next my intent is to fiddle around with ServicePointManager.SetTcpKeepAlive(). However, I can't see how more people haven't run into this problem. Has anyone else run into the problem, and if so, what did you do to get around it? Currently I have a retry scheme that detects this error and waits it out, but that doesn't seem like the right thing to do. Here's some basic code to verify what I'm doing (just in case I'm missing closing something): WebRequest webRequest = WebRequest.Create(uri); webRequest.Method = "GET"; webRequest.Credentials = new NetworkCredential(username, password); WebResponse webResponse = webRequest.GetResponse(); try { using(Stream stream = webResponse.GetResponseStream()) { // read the stream } } finally { webResponse.Close() }

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• how many types of code signing certificates do I need?

  - by gerryLowry

  in Canada, website SSL certificates can be had for as low as US$10. unfortunately, code signing certificates cost about 10 time as much, one website mentions Vista compatibility ... this seems strange because my assumption is they must support XP, Vista, Windows 7, Server 2003, and Server 2008 or they would be useless. https://secure.ksoftware.net/code_signing.html US$99 Support Platforms Microsoft Authenticode. Sign any Microsoft executable format (32 and 64 bit EXE, DLL, OCX, DLL or any Active X control). Signing hardware drivers is not currently supported. Abode AIR. Sign any Adobe AIR application. Java. Sign any JAR applet Microsoft Office. Sign any MS Office Macro or VBA (Visual Basic for Applications) file. Mozilla. Sign any Mozilla Object file. The implication is that a single code signing certificate can do ALL of the above. ksoftware actually discounts Commodo certificates and the Commode website is unclear. QUESTION: Will ONE code signing certificate be enough or do I need one for Microsoft executables, and a second for things like Word and Excel macros? my main goal is to sign things like vs2008 code snippets so that I can export them securely; however, I would like to be able to use the same code signing certificate for signing other items too. Thank you ~~ regards, Gerry (Lowry)

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• FullCalendar and events: function

  - by Ernest

  I am trying to display my events from a MySQL database. I'm using the events function. My XML file being returned is pretty basic. I've looked at all of the FullCalendar questions and most of them talk about JSON and point to the documentation for JSON. I can't use JSON. I have to go XML. Can you tell me where I'm off. Here is a sample of what my xml looks like: Grow Your Business on the Web 2010-06-05T9:30 2010-06-05T12:30 O The whole file is prefaced with a tag and closed with a tag. My jquery is as follows: $(document).ready(function() { $('#calendar').fullCalendar({ height: 550, theme: true, header: { left: 'prev,next today', center: 'title', right: 'month,agendaWeek,agendaDay' }, editable: true, events: function(start, end, callback) { $.ajax({ url: 'ncludeFiles/sbdp-cal-xml.php', dataType: 'xml', data: { // our hypothetical feed requires UNIX timestamps start: Math.round(start.getTime() / 1000), end: Math.round(end.getTime() / 1000) }, success: function(doc) { var events = []; $(doc).find('event').each(function() { events.push({ title: $(this).attr('title'), start: $(this).attr('start'), end: $(this).attr('end'), className: $(this).attr('className'), url: $(this).attr('url') }); }); callback(events); } }); } }); }); I'd appreciate any help you could give me. Thanks!

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• How to download a wav file from the web to a location on iPhone using NSFileHandle and NSURLConnecti

  - by Jinru

  Hi all, I want to download a wav file from a web service, cache it on the iphone and playback it using AVAudioPlayer. Using NSFileHandle and NSURLConnection seems a viable solution when dealing with relatively large files. However, after running the app in the simulator I don't see any saved file under the defined directory (NSHomeDirectory/tmp). Below is my basic code. Where am I doing wrong? Any thoughts are appreciated! #define TEMP_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"] - (void)downloadToFile:(NSString*)name { NSString* filePath = [[NSString stringWithFormat:@"%@/%@.wav", TEMP_FOLDER, name] retain]; self.localFilePath = filePath; // set up FileHandle self.audioFile = [[NSFileHandle fileHandleForWritingAtPath:localFilePath] retain]; [filePath release]; // Open the connection NSURLRequest* request = [NSURLRequest requestWithURL:self.webURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; NSURLConnection* connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; } #pragma mark - #pragma mark NSURLConnection methods - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data { [self.audioFile writeData:data]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError*)error { NSLog(@"Connection failed to downloading sound: %@", [error description]); } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; [audioFile closeFile]; }

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• OCR: How to improve accuracy - existing libraries for removing non-text 'furniture', shapes, etc to

  - by Rob

  I want to remove rectangles etc that enclose text in a screenshot image, so that I can perform optical character recognition to get accurate text from the screenshot. Background: I doing this to extract data from a legacy application for use with other applications. This is the only way to get at this data as associated files are in a closed, proprietary, binary format. I will be using AutoItScript to drive the application to show data in its UI, then I will screenshot this and feed this to tesseract. I've already had some success in automating the UI, and have been able to use tesseract to get plain ascii text out of the bitmap. There are several AutoItScripr forum articles discussing its use with tesseract/OCR but not specifically for my question. http://www.autoitscript.com/forum/index.php?s=6c32c3ece12756e635a619cdf175eff9&showforum=2 What I need to do There are thin, 1-pixel wide rectangles that closely enclose some text, when fed to tesseract, it sees them as I for example for a verticle line of the rectangle. Any thoughts on how to remove the rectangles, or best practices? I'm asking if there is a generic command line based toolset to overwrite rectangles, for example, in .png files. I could then pass the .png through this, then pass it to tesseract. Details on the tesseract release/setup I've used are as follows: Go here: http://code.google.com/p/tesseract-ocr/downloads/list - For the basic english generic character set to get Tesseract up and running and recognising your bitmapped text into ascii text, use tesseract-2.00.eng.tar.gz (current version at time of writing is: "English language data for Tesseract (2.00 and up) Jul 2007 989 KB 84845") Related questions I have already looked at on Stack Overflow http://stackoverflow.com/questions/1335581/how-to-give-best-chance-of-success-to-an-ocr-software http://stackoverflow.com/questions/2296568/analysis-and-transformation-of-the-image-on-the-basis-of-this-analysis-for-better http://stackoverflow.com/questions/2268028/reading-characters-off-of-the-screen In these, my question is not completely answered or a commercial solution is being sold. I do not want to consider a commercial solution at this stage.

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• Handling multiple column data with Java

  - by Ender

  I am writing an application that reads in a large number of basic user details in the following format; once read in it then allows the user to search for a user's details using their email: NAME ROLE EMAIL --------------------------------------------------- Joe Bloggs Manager [email protected] John Smith Consultant [email protected] Alan Wright Tester [email protected] ... The problem I am suffering is that I need to store a large number of details of all people that have worked at the company. The file containing these details will be written on a yearly basis simply for reporting purposes, but the program will need to be able to access these details quickly. The way I aim to access these files is to have a program that asks the user for the name of the unique email of the member of staff and for the program to then return the name and the role from that line of the file. I've played around with text files, but am struggling with how I would handle multiple columns of data when it comes to searching this large file. What is the best format to store such data in? A text file? XML? The size doesn't bother me, but I'd like to be able to search it as quickly as possible. The file will need to contain a lot of entries, probably over the 10K mark over time.

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• Selection Highlight in NSCollectionView

  - by Hooligancat

  On some occasions my head just hurts from banging it against the Cocoa wall. Today is one of those days. I have a working NSCollectionView with one minor, but critical, exception. Getting and highlighting the selected item within the collection. I've had all this working prior to Snow Leopard, but something appears to have changed and I can't quite place my finger on it, so I took my NSCollectionView right back to a basic test and followed Apple's documentation for creating an NSCollectionView here: http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/CollectionViews/Introduction/Introduction.html The collection view works fine following the quick start guide. However, this guide doesn't discuss selection other than "There are such features as incorporating image views, setting objects as selectable or not selectable and changing colors if they are selected". Using this as an example I went to the next step of binding the Array Controller to the NSCollectionView with the controller key selectionIndexes, thinking that this would bind any selection I make between the NSCollectionView and the array controller and thus firing off a KVO notification. I also set the NSCollectionView to be selectable in IB. There appears to be no selection delegate for NSCollectionView and unlike most Cocoa UI views, there appears to be no default selected highlight. So my problem really comes down to a related issue, but two distinct questions. How do I capture a selection of an item? How do I show a highlight of an item? NSCollectionView's programming guides seem to be few and far between and most searches via Google appear to pull up pre-Snow Leopard implementations, or use the view in a separate XIB file. For the latter (separate XIB file for the view), I don't see why this should be a pre-requisite otherwise I would have suspected that Apple would not have included the view in the same bundle as the collection view item. I know this is going to be a "can't see the wood for the trees" issue - so I'm prepared for the "doh!" moment. As usual, any and all help much appreciated.

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• Improving long-polling Ajax performance

  - by Bears will eat you

  I'm writing a webapp (Firefox-compatible only) which uses long polling (via jQuery's ajax abilities) to send more-or-less constant updates from the server to the client. I'm concerned about the effects of leaving this running for long periods of time, say, all day or overnight. The basic code skeleton is this: function processResults(xml) { // do stuff with the xml from the server } function fetch() { setTimeout(function () { $.ajax({ type: 'GET', url: 'foo/bar/baz', dataType: 'xml', success: function (xml) { processResults(xml); fetch(); }, error: function (xhr, type, exception) { if (xhr.status === 0) { console.log('XMLHttpRequest cancelled'); } else { console.debug(xhr); fetch(); } } }); }, 500); } (The half-second "sleep" is so that the client doesn't hammer the server if the updates are coming back to the client quickly - which they usually are.) After leaving this running overnight, it tends to make Firefox crawl. I'd been thinking that this could be partially caused by a large stack depth since I've basically written an infinitely recursive function. However, if I use Firebug and throw a breakpoint into fetch, it looks like this is not the case. The stack that Firebug shows me is only about 4 or 5 frames deep, even after an hour. One of the solutions I'm considering is changing my recursive function to an iterative one, but I can't figure out how I would insert the delay in between Ajax requests without spinning. I've looked at the JS 1.7 "yield" keyword but I can't quite wrap my head around it, to figure out if it's what I need here. Is the best solution just to do a hard refresh on the page periodically, say, once every hour? Is there a better/leaner long-polling design pattern that won't put a hurt on the browser even after running for 8 or 12 hours? Or should I just skip the long polling altogether and use a different "constant update" pattern since I usually know how frequently the server will have a response for me?

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• Paypal (sandbox) buy now link redirects to paypal (sandbox) login page instead of order summary

  - by Nicolas

  Hi, Before going live I try to test the paypal process against the paypal sandbox mode, but after the summary of what the user is going to pay on my website(buy now button), the link does not redirect to a paypal summary of the prder but ask the user to connect to paypal. Even after logging into the buyer sandbox account there's no summary of the order. It just disappears. Here's is the code I use on the checkout page: <form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post"> <input type="hidden" name="cmd" value="_s-xclick"> <input type="hidden" name="hosted_button_id" value="XXXXXXXXXXXXXXXX"> <input type="hidden" name="notify_url" value="http://www.website.com/paypal/"> <div class="suggestion"> <input type="image" src="https://www.sandbox.paypal.com/en_GB/i/btn/btn_paynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!"> <img alt="" border="0" src="https://www.sandbox.paypal.com/en_GB/i/scr/pixel.gif" width="1" height="1"> </div> </form> Any idea why it redirects to the payapl login page instead of the order one? Btw I'm using the Website Basic Payment (not PRO then). Cheers, Nicolas.

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• Intellij Javafx artifact - how do you make it?

  - by Louis Sayers

  I've been trying all day to turn my javafx application into a jar file. I'm using Java 1.7 update 7. Oracle has some information, but it just seems scattered all over the place. Intellij is almost doing the job, but I get the following error: java.lang.NoClassDefFoundError: javafx/application/Application Which seems to say that I need to tell java where the jfxrt.jar is... If I add this jar to my classpath info for the manifest build in intellij - ctrl+shift+alt+s - Artifacts - Output Layout tab - Class Path, then I get another error: Could not find or load main class com.downloadpinterest.code.Main It seems strange to have to include jfxrt.jar in my class path though... I've tried to create an ant script as well, but I feel like IntelliJ is 90% of the way there - and I just need a bit of help to figure out why I need to include jfxrt.jar, and why my Main class isn't being found (I'm guessing I need to add it to the classpath somehow?). Could anyone clue me up as to what is happening? I had a basic gui before which worked fine, but JavaFX seems to be making life complicated!

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• CSS background-images and Z-Index problem

  - by dscher

  Hope someone has an easy answer on this. I have a header image which is just a 75px high gradient with a fade on the bottom. I have it set as the background image on my header and I want to throw in a left-sidebar on my page. There is a transparency on the header image and when I have my sidebar I can't get it to sit behind the header. You can see in this screenshot: link text The green sidebar won't "sit" behind the header. I have the header z-index set to 99 and the sidebar to 1. I tried the reverse to make sure I didn't mix up my numbers but that didn't work. Both are absolutely positioned. I'm attaching their CSS selectors in the hopes someone has an easy answer. Am sure I'm missing something basic: div.header { z-index: 99; background: transparent; background-image: url(images/header_bg.png); position: absolute; height: 85px; width: 100%; font-family: Helvetica, Verdana, Arial, sans-serif; } div#leftsidebar { height: 400px; border-right-style: dashed; border-right-width: 1px; z-index: -1; margin-top: 75px; width: 200px; position: absolute; background-color: #66ff66; } Thanks.

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• Android SDK fails to install

  - by Paul Breed

  When I try to install the android SDK it fails to install. My OS is Windows XP I just downloaded and installed Java JDK 1.6 Java -version from the command line returns: http://stackoverflow.com/questions/ask java version "1.6.0_17" Java(TM) SE Runtime Environment (build 1.6.0_17-b04) Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing) My environment vars have: JAVA_HOME=c:\progra~1\java\jdk1.6.0_11 I downloaded android-sdk-r04-windows.zip I unziped it in V:\AndroidInstall\ When I go to the V:\androindinstall\android-sdk-windows and type "SDK Install.exe" nothing happens... If I go this from graph When I do this from a graphical file viewer I get a quick flash that looks like a command line window and nothing.... When I try to run android list targets from the tool directory I get: Error: Error parsing the sdk. Error: V:\androindinstall\android-sdk-windows\platforms is missing. Error: Unable to parse SDK content. So the basic install setup is not happening. Additional clues: I have a G1 and Android 1.0 was running on this machine. (Almost a year ago) I've updated my G1 to 1.6 so I thought I'd update my SDK before starting new development. When I tried to upgrade it tried and then died as the "directory was in use" So I cleaned out all the android directories, rebooted and redownloaded everythign from scratch. Now it won't run at all. I've clearly got something in an unhappy state, but I've cleaned up all the directories and no remanants seem to be running I've rebooted.... I've missed somethign I just can't figure out what. Paul

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• SharePoint custom web service consumption problems - HTTP 401: Unauthorized

  - by alekz

  I have a custom web service deployed into WSS 3. It has two web methods. The first one returns the version of the loaded assembly without any invocation of the SharePoint objects. The second returns some basic info about the library, something like: var spLibrary = [find library logic]; return spLibrary.Name+"@"+spLibrary.Url; In the client app I have something like the following: var service = new WebService1(); service.Url = [url]; service.Credentials = System.Net.CredentialCache.DefaultCredentials; service.Method1(); service.Method2(); When the client app runs on the machine where SharePoint is deployed, everything works just fine. When the client app runs on the remote machine (but under the same user) the first method still works, but the second one throws System.Net.WebException: HTTP 401: Unauthorized. I have tried to set credentials manualy (service.Credentials = new System.Net.NetworkCredential(login, password, domain);) but this doesnt help. I've tried to invoke the built in SharePoint web services using a similar scenario, and they work just fine: Sorry for the mistake... Some methods were not working fine without the appropriate privileges. var service = new GroupsService(); service.Url = [url]; service.Credentials = System.Net.CredentialCache.DefaultCredentials; service.SomeMethod();

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• Determining the maximum stack depth

  - by Joa Ebert

  Imagine I have a stack-based toy language that comes with the operations Push, Pop, Jump and If. I have a program and its input is the toy language. For instance I get the sequence Push 1 Push 1 Pop Pop In that case the maximum stack would be 2. A more complicated example would use branches. Push 1 Push true If .success Pop Jump .continue .success: Push 1 Push 1 Pop Pop Pop .continue: In this case the maximum stack would be 3. However it is not possible to get the maximum stack by walking top to bottom as shown in this case since it would result in a stack-underflow error actually. CFGs to the rescue you can build a graph and walk every possible path of the basic blocks you have. However since the number of paths can grow quickly for n vertices you get (n-1)! possible paths. My current approach is to simplify the graph as much as possible and to have less possible paths. This works but I would consider it ugly. Is there a better (read: faster) way to attack this problem? I am fine if the algorithm produces a stack depth that is not optimal. If the correct stack size is m then my only constraint is that the result n is n = m. Is there maybe a greedy algorithm available that would produce a good result here?

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• Standard Apache (not OHS) with mod_osso for Single Signon

  - by Markos Fragkakis

  The mod_osso.so (the Apache plugin for Single Signon, provided by Oracle) is distributed with the Oracle HTTP Server (OHS), which is essentially a modified Apache. I am trying to use it on the standard Apache HTTP Server, and have not managed to get it to work. Configuration: Apache 2.2.15 OHS from the Oracle Web Tier Tools 11.1.1.2.0 Red Hat Linux 64 bit I have: Included the module in the modules directory (copied from corresponding modules dir in OHS) Included the libraries libiau.so and libclutsh.so.11.1 from Oracle Home. The absence of these libraries produced an error on starting Apache. Produced a osso.conf using the ssoreg.sh tool provided with OID (the LDAP implementation of Oracle) Created the required mod_osso.conf file, which I included in httpd.conf. The error I get when starting Apache is this: # /opt/apache_sso/bin/apachectl -k start httpd: Syntax error on line 1075 of /opt/apache_sso/conf/httpd.conf: Syntax error on line 1 of /opt/apache_sso/conf/mod_osso.conf: Cannot load /opt/apache_sso/modules/mod_osso.so into server: /opt/apache_sso/modules/mod_osso.so: undefined symbol: _audit_authentication_request My mod_osso.conf: # cat /opt/apache_sso/conf/mod_osso.conf LoadModule osso_module modules/mod_osso.so <IfModule mod_osso.c> OssoIdleTimeout off OssoIpCheck on OssoConfigFile conf/osso.conf #Location is the URI you want to protect <Location /myapp> require valid-user #OHS 11g AuthType Osso #OHS 10g AuthType Basic AuthType Osso </Location> </IfModule> Has anyone made mod_osso work on standard Apache HTTP server?

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• Problem binding action parameters using FCKeditor, AJAX and ASP.NET MVC

  - by TonE

  I have a simple ASP.Net MVC View which contains an FCKeditor text box (created using FCKeditor's Javascript ReplaceTextArea() function). These are included within an Ajax.BeginForm helper: <% using (Ajax.BeginForm("AddText", "Letters", new AjaxOptions() { UpdateTargetId = "addTextResult" })) {%> <div> <input type="submit" value="Save" /> </div> <div> <%=Html.TextArea("testBox", "Content", new { @name = "testBox" })%> <script type=""text/javascript""> window.onload = function() { var oFCKeditor = new FCKeditor('testBox') ; var sBasePath = '<%= Url.Content("~/Content/FCKeditor/") %>'; oFCKeditor.BasePath = sBasePath; oFCKeditor.ToolbarSet = "Basic"; oFCKeditor.Height = 400; oFCKeditor.ReplaceTextarea() ; } </script> <div id="addTextResult"> </div> <%} %> The controller action hanlding this is: [ValidateInput(false)] public ActionResult AddText(string testBox) { return Content(testBox); } Upon initial submission of the Ajax Form the testBox string in the AddText action is always "Content", whatever the contents of the FCKeditor have been changed to. If the Ajax form is submitted again a second time (without further changes) the testBox paramater correctly contains the actual contents of the FCKeditor. If I use a Html.TextArea without replacing with FCKeditor it works correctly, and if I use a standard Post form submit inplace of AJAX all works as expected. Am I doing something wrong? If not is there a suitable/straight-forward workaround for this problem?

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• Extending Zend View Helper Placeholder

  - by Sonny

  I was reading the manual about basic placeholder usage, and it has this example: class Bootstrap extends Zend_Application_Bootstrap_Bootstrap { // ... protected function _initSidebar() { $this->bootstrap('View'); $view = $this->getResource('View'); $view->placeholder('sidebar') // "prefix" -> markup to emit once before all items in collection ->setPrefix("<div class=\"sidebar\">\n <div class=\"block\">\n") // "separator" -> markup to emit between items in a collection ->setSeparator("</div>\n <div class=\"block\">\n") // "postfix" -> markup to emit once after all items in a collection ->setPostfix("</div>\n</div>"); } // ... } I want to acommplish almost exactly that, but I'd like to conditionally add more class values to the repeating divs, at time of rendering if possible, when all the content is in the placeholder. One thing I specifically want to do is add the class of "first" to the first element and "last" to the last element. I assume that I'll have to extend the Zend_View_Helper_Placeholder class to accomplish this.

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• ASP Classic page quit working

  - by justSteve

  I've had a set of legacy pages running on my IIS7 server for at least a year. Sometime last week something changed and now this line: Response.Write CStr(myRS(0).name) & "=" & Cstr(myRS(0).value) which used to return nothing more exciting than the string: 'Updated=true' (the sproc processing input params, stores them to a table, checks for errors and when that's all done returns a success code by executing this statement: select 'true' as [Updated] Now my pageside error handler is being involved and offers: myError=Error from /logQuizScore.asp Error source: Microsoft VBScript runtime error Error number: 13 Error description: Type mismatch Important to note that all lots of pages use the same framework - same db, same coding format, connecitonstrings and (so far as I can tell) all others are working. Troubleshot to this point: The call to the stored procedure is working correctly (stuff is stored to the given table). The output from the stored procedure is working correctly (i can execute a direct call with the given parameters and stuff works. I can see profiler calling and passing. I can replace all code with 'select 'true' as updated' and the error is the same. everything up to the response.write statement above is correct. So something changed how ADO renders that particular recordset. So i try: Response.Write myRS.Item.count and get: Error number: 424 Error description: Object required The recordset object seems not to be instantiating but the command object _did execute. Repeat - lots of other pages just the same basic logic to hit other sprocs without a problem. full code snippet set cmd1 = Server.CreateObject("ADODB.Command") cmd1.ActiveConnection = MM_cnCompliance4_STRING cmd1.CommandText = "dbo._usp_UserAnswers_INSERT" ... cmd1.CommandType = 4 cmd1.CommandTimeout = 0 cmd1.Prepared = true set myRS = cmd1.Execute Response.Write CStr(myRS(0).name) & "=" & Cstr(myRS(0).value)

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• Why is it so difficult to get a working IDE for Scala?

  - by Alex R

  I recently gave up trying to use Scala in Eclipse (basic stuff like completion doesn't work). So now I'm trying IntelliJ. I'm not getting very far. This was the original error. See below for update: Scala signature Predef has wrong version Expected 5.0 found: 4.1 in .... scala-library.jar I tried both versions 2.7.6 and 2.8 RC1 of scala-*.jar, the result was the same. JDK is 1.6.u20. UPDATE Today I uninstalled IntelliJ 9.0.1, and installed 9.0.2 Early Availability, with the 4/14 stable version of the Scala plug-in. Then I setup a project from scratch through the wizards: new project from scratch JDK is 1.6.u20 accept the default (project) instead of global / module accept the download of Scala 2.8.0beta1 into project's lib folder Created a new class: object hello { def main(args: Array[String]) { println("hello: " + args); } } For my efforts, I now have a brand-new error :) Here it is: Scalac internal error: class java.lang.ClassNotFoundException [java.net.URLClassLoader$1.run(URLClassLoader.java:202), java.security.AccessController.doPrivileged(Native Method), java.net.URLClassLoader.findClass(URLClassLoader.java:190), java.lang.ClassLoader.loadClass(ClassLoader.java:307), sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301), java.lang.ClassLoader.loadClass(ClassLoader.java:248), java.lang.Class.forName0(Native Method), java.lang.Class.forName(Class.java:169), org.jetbrains.plugins.scala.compiler.rt.ScalacRunner.main(ScalacRunner.java:72)] Thanks

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• Migrating complex SVN branch hierarchy to Mercurial

  - by Christian Hang

  Our team has been using SVN for managing an application of decent size and over time a rather complex hierarchy of branches and tags has built up, which is following the basic standard layout for SVN repositories, but is more nested: |-trunk |-branches | |-releases | | |-releaseA | | `-releaseB | `-features | |-featureX | `-featureY |-tags |-releaseA | |-beta | `-RTP `-releaseB |-beta `-RTP (The feature branches are obviously temporary branches but we have to take them into consideration as it won't be feasible to close all of them at once in the near future) For several reasons but primarily because merges have been becoming an increasing pain, we are considering to switch to Mercurial. The main problem we are currently facing is migrating the existing code base without losing our history. I've tried several migration tools (e.g., yasvn2hg, hg convert and svn2hg) with yasvn2hg being the most promising, but none of them seem to be able to deal with nested hierarchies but they all assume that branches and tags are organized in one flat directory respectively. The choice between named branches or clones as the conversion target of old SVN branches is not a limiting factor in this case, as either solution would be appreciated. We are currently experimenting with both options and how they would fit into our current processes but haven't decided on one yet. I'd obviously be interested in recommendations or experiences with similar setups concerning that issue as well. So, what is the best way to convert a nested SVN branch hierarchy like this to Mercurial? Converting one branch at a time into a separate repository would be quite annoying and I am not sure if that would be the right approach in the first place, depending on how the tools handle historic merges and need to be aware of all other branches?

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