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  • How to store images without taking up huge amounts of RAM

    - by Sheeo
    I'm working on a silverlight project where users get to create their own Collages. The problem When loading a bunch of images by using the BitmapImage class, Silverlight hogs up huge unreasonable amounts of RAM. 150 pictures where single ones fill up at most 4,5mb takes up about 1,6GB of RAM--thus ending up throwing memory exceptions. I'm loading them through streams, since the user selects their own photos. What I'm looking for A class, method or some process to eliminate the huge amount of RAM being sucked up. I've tried using a WriteableBitmap to render the images into, but I find this method forces me to reinvent the wheel when it comes to drag/drop and other things I want users to be able to do with the images.

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  • Prevent Method call without Exception using @PreAuthorize Annotation

    - by Chepech
    Hi all. We are using Spring Security 3. We have a custom implementation of PermissionEvaluator that has this complex algorithm to grant or deny access at method level on the application. To do that we add a @PreAuthorize annotation to the method we want to protect (obviously). Everything is fine on that. However the behavior that we are looking for is that if a hasPermission call is denied, the protected method call only needs to be skipped, instead we are getting a 403 error each time that happens. Any ideas how to prevent that? You can find a different explanation of the problem here; AccessDeniedException handling during methodSecurityInterception

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  • Java Convert ColorSpace of BufferedImage to CS_GRAY without using ConvertColorOp

    - by gmatt
    I know its possible to convert an image to CS_GRAY using public static BufferedImage getGrayBufferedImage(BufferedImage image) { BufferedImageOp op = new ColorConvertOp(ColorSpace .getInstance(ColorSpace.CS_GRAY), null); BufferedImage sourceImgGray = op.filter(image, null); return sourceImgGray; } however, this is a chokepoint of my entire program. I need to do this often, on 800x600 pixel images and takes about 200-300ms for this operation to complete, on average. I know I can do this alot faster by using one for loop to loop through the image data and set it right away. The code above on the other hand constructs a brand new 800x600 BufferedImage that is gray scale. I would rather just transform the image I pass in. Does any one know how to do this with a for loop and given that the image is RGB color space?

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  • Trap SIGPIPE when trying to write without reader

    - by Matt
    I am trying to implement a named-pipe communication solution in BASH between two processes. The first process runs a script which echo something in a named-pipe: send(){ echo 'something' > $NAMEDPIPE } And the second script is supposed to read the named-pipe via another script which contains: while true;do if read line < $NAMEDPIPE;do someCommands fi done Not that the named pipe has been previously created using the traditional command mkfifo $NAMEDPIPE My problem is that the reader script is not always running so that if the writer script try to write in the named-pipe it stay blocked until a reader connect the pipe. I want to avoid this behavior, and a solution would be to trap a SIGPIPE signal. Indeed, according to man 7 signal is supposed to be send when trying to write in a pipe with no reader. So I changed my red function by: read(){ trap 'echo "SIGPIPE received"' SIGPIPE echo 'something' > $NAMEDPIPE } But when I run the reader script, the script stay blocked, and not "SIGPIPE received" appears... Am I mistaking on the signal mechanism or is there any better solution to my problem ? Thank you for your help.

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  • Storing records in a dropdownlist from DB without using LINQ Data source

    - by user1318369
    I have a website for dance academy where Users can register and add/drop dance classes. In the web page to drop a particular dance, for a particular user, the dropdown displays her registered dances. Now I want to delete one of the dances from the list. So i'll remove the row from the table and also from the dropdownlist. The problem is that everytime the item with the lowest ID (index) is getting deleted, no matter which one the user selects. I think I am storing the DataTextField and DataValueField for the dropdown incorrectly. Can someone please help me out? The code is: private void PopulateDanceDropDown() { var registereddanceList = from dd in context.DANCER_AND_DANCE where dd.UserId == dancerId select new { Text = dd.DanceName, Value = dd.DanceId }; dances.DataSource = registereddanceList; dances.DataTextField = "Text"; dances.DataValueField = "Value"; dances.DataBind(); } protected void dropthedance(object o, EventArgs e) { String strDataValueField = dances.SelectedItem.Value; int danceIDFromDropDown = Convert.ToInt32(strDataValueField); var dancer_dance = from dd in context.DANCER_AND_DANCE where dd.DanceId == danceIDFromDropDown select dd; foreach (var dndd in dancer_dance) { context.DANCER_AND_DANCE.DeleteOnSubmit(dndd); } try { context.SubmitChanges(); } catch (Exception ex) { Console.WriteLine(ex); } PopulateDanceDropDown(); }

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  • Stage untracked files for commit without staging tracked file changes

    - by Blair Holloway
    Oftentimes, when using git, I find myself in this situation: I have changes to several files, but I only want to commit parts of them. I have added several untracked files, which I want to track and commit. Solving the first part is easy; I run: git add -p Then, I choose which hunks to stage, and which hunks remain in my working tree, but unstaged. However, git's patch mode skips over untracked files. What I would like to do is something like: git add --untracked But no such option appears to exist. If I have, say, six untracked files, I could stage them using add in interactive mode and the add untracked option, like so: git add -i a<CR> 1<CR> 2<CR> 3<CR> 4<CR> 5<CR> 6<CR> <CR> q<CR> I feel like there is, or should be, a quicker way of doing this, though. What am I missing?

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  • Create a Task list, with tasks without executing

    - by Ernesto Araya Eguren
    I have an async method private async Task DoSomething(CancellationToken token) a list of Tasks private List<Task> workers = new List<Task>(); and I have to create N threads that runs that method public void CreateThreads(int n) { tokenSource = new CancellationTokenSource(); token = tokenSource.Token; for (int i = 0; i < n; i++) { workers.Add(DoSomething(token)); } } but the problem is that those have to run at a given time public async Task StartAllWorkers() { if (0 < workers.Count) { try { while (0 < workers.Count) { Task finishedWorker = await Task.WhenAny(workers.ToArray()); workers.Remove(finishedWorker); finishedWorker.Dispose(); } if (workers.Count == 0) { tokenSource = null; } } catch (OperationCanceledException) { throw; } } } but actually they run when i call the CreateThreads Method (before the StartAllWorkers). I searched for keywords and problems like mine but couldn't find anything about stopping the task from running. I've tried a lot of different aproaches but anything that could solve my problem entirely. For example, moving the code from DoSomething into a workers.Add(new Task(async () => { }, token)); would run the StartAllWorkers(), but the threads will never actually start. There is another method for calling the tokenSource.Cancel().

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  • is there a way to disconnect from facebook login without calling logout

    - by Joey
    Basically, I'd like to know how I can logout of my facebook session if I am in an iphone app and have connected to facebook (such that I do not have to repeatedly enter my login/password). Normally you'd disconnect in the app somewhere like in the options, but if this is not available (i.e. anything that triggers the FBSession logout method) is there some other way to do it? I'm guessing one could restore their phone to factory settings or something.

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  • get static initialization block to run in a java without loading the class

    - by TP
    I have a few classes as shown here public class TrueFalseQuestion implements Question{ static{ QuestionFactory.registerType("TrueFalse", "Question"); } public TrueFalseQuestion(){} } ... public class QuestionFactory { static final HashMap<String, String > map = new HashMap<String,String>(); public static void registerType(String questionName, String ques ) { map.put(questionName, ques); } } public class FactoryTester { public static void main(String[] args) { System.out.println(QuestionFactory.map.size()); // This prints 0. I want it to print 1 } } How can I change TrueFalseQuestion Type so that the static method is always run so that I get 1 instead of 0 when I run my main method? I do not want any change in the main method. I am actually trying to implement the factory patterns where the subclasses register with the factory but i have simplified the code for this question.

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  • Ant fails without message at javac

    - by digitala
    I've written an Ant build.xml file which obtains a number of source files via WSDL and compiles them. These have been working on an old, now destroyed (and therefore unavailable for comparison), system but the build process isn't completing on this newer, faster system. The relevant section of the build file looks like this: <target name="compile" depends="init"> <java classname="org.apache.axis.wsdl.WSDL2Java"> <arg line="--all --server-side --skeletonDeploy --factory --wrapArrays --output src ${srcurl}" /> </java> <javac srcdir="${src}" destdir="${build}" verbose="yes" /> </target> The files are downloaded via the WSDL service successfully, however after that point Ant simply stops & returns to the commandline. Versions of the relevant apps: # java -version java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode) # javac -version javac 1.6.0_14 # ant -version Apache Ant version 1.6.5 compiled on January 6 2007 I'm assuming that there's a problem with javac that Ant isn't passing back. Is there any way I can get some debugging information from javac? I've tried adding a <record /> tag to the target but that doesn't give any more information than running ant -v does. Any other suggestions would be great, also!

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  • How do I echo $command without breaking the layout

    - by w00t
    Hi. I'm trying to do the following in a bash script: com=`ssh host "ls -lh" ` echo $com It works, but the echo will break the output (instead of getting all lines in a column, I get them all in a row). If I do: ssh host ls -lh in the CLI it will give me the correct output + layout. Any ideas?

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  • Switch/case without break inside DllMain

    - by Sherwood Hu
    I have a Dllmain that allocates Thread local storage when a thread attaches to this DLL. Code as below: BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) { LPVOID lpvData; BOOL fIgnore; switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: onProcessAttachDLL(); // Allocate a TLS index. if ((dwTlsIndex = TlsAlloc()) == TLS_OUT_OF_INDEXES) return FALSE; // how can it jump to next case??? case DLL_THREAD_ATTACH: // Initialize the TLS index for this thread. lpvData = (LPVOID) LocalAlloc(LPTR, MAX_BUFFER_SIZE); if (lpvData != NULL) fIgnore = TlsSetValue(dwTlsIndex, lpvData); break; ... } I know that for the main thread, the DLL_THREAD_ATTACH is not entered, as per Microsoft Documentation. However, the above code worked. I am using VC2005. When I entered the debugger, I saw that after it entered DLL_THREAD_ATTACH case when ul_reason_for_call = 1! How can that happen? If I add `break' at the end of DLL_PROCESS_ATTACH block, the DLL failed to work. How can this happen?

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  • How to select DISTINCT rows without having the ORDER BY field selected

    - by JannieT
    So I have two tables students (PK sID) and mentors (PK pID). This query SELECT s.pID FROM students s JOIN mentors m ON s.pID = m.pID WHERE m.tags LIKE '%a%' ORDER BY s.sID DESC; delivers this result pID ------------- 9 9 3 9 3 9 9 9 10 9 3 10 etc... I am trying to get a list of distinct mentor ID's with this ordering so I am looking for the SQL to produce pID ------------- 9 3 10 If I simply insert a DISTINCT in the SELECT clause I get an unexpected result of 10, 9, 3 (wrong order). Any help much appreciated.

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  • Automatically copy files without overwriting, but creating numbered ones instead

    - by user1688322
    I need to copy files at a regular interval, eg once an hour so I tried setting up an xcopy batch saying it should copy the files it needs to copy to another folder. Now when it copies, it overwrites the files which is not what it is supposed to do. When a file is copied, it should create a new file instead, named something like File.txt, File-COPY1.txt, File-COPY2.txt or something like that. Any way to do that? Thanks in advance.

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  • Output excel spreadsheets with or without Office PIA

    - by user144182
    I have a program that currently outputs Excel via SpreadsheetML files. I build these using streams. This is very space inefficient for Excel; the files can be 5 to 6 times as large as other Excel binary formats. I would like to output a binary excel format such as .xls or .xlsx, but I don't want to have the installation of the program depend on Office. Some users might have it installed, some might not. How can I handle this gracefully? Is it possible to not have an assembly as a dependency but based on the user enabling binary output still use the assembly?

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  • Copying Data to a Master sheet from other sheets without duplicates

    - by sam
    I have four workbooks, three of which are for data entries, and the latter which hosts all data entered in the other workbooks; as a matter of fact, it serves as a master workbook. I need code to copy data entered in each workbook in sheet 1 to be copied to the next available row on sheet 1 of the master workbook, but if the data to be copied from these individual workbooks are duplicates, then a message box should pop up displaying that its a duplicate. To be precise, I want the users to type p in column j indicating process, and click a button in the spreadsheet to copy the data to the master sheet. I would be glad for any assistance. Thanks a million for any help.

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  • Authenticate using openID without login through provider

    - by thabet084
    Dear all , I create web application to connect to MySpace Offsite App and I want to authenticate I used the following code var openid = new OpenIdRelyingParty(); IAuthenticationRequest request = openid.CreateRequest("http://www.myspace.com/thabet084"); request.AddExtension(new OAuthRequest("OAuthConsumerKey")); request.RedirectToProvider(); var response = openid.GetResponse(); OAuthResponse oauthExtension = new OAuthResponse(); if (response != null) { switch (response.Status) { case AuthenticationStatus.Authenticated: oauthExtension = response.GetExtension<OAuthResponse>(); var user_authorized_request_token = oauthExtension.RequestToken; break; } } OffsiteContext context = new OffsiteContext("ConsumerKey", "ConsumerSecret"); var accessToken = (AccessToken)context.GetAccessToken(oauthExtension.RequestToken, "", ""); and I used the following refrences DotNetOpenAuth.dll and MySpaceID.SDK.dll My problems are: I always found that responce=null I don't need user to login through provider MySpace so i need to remove RedirectToProvider(); My application in brief is to send status from mywebsite to MySpace account Just click on button to send All ideas are welcome BR, Mohammed Thabet Zaky

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  • Database schemas WAY out of sync - need to get up to date without losing data

    - by Zind
    The problem: we have one application that has a portion which is used by a very small subset of the total users, and that part of the application is running off of a separate database as well. In a perfect world, the schemas of the two databases would be synced up, but such is not the case. Some migrations have been run on the smaller database, most haven't; and furthermore, there is nothing such as revision number to be able to easily identify which have and which haven't. We would like to solve this quandary for future projects. During a discussion we've come up with the following possible plan of action, and I am wondering if anyone knows of any project which has already solved this problem: What we would like to do is create an empty database from the schema of the large fully-migrated database, and then move all of the data from the smaller non-migrated database into that empty one. If it makes things easier, it can probably be assumed for the sake of this problem specifically that no migrations have ever removed anything, only added. Else, if there are other known solutions, I'd like to hear them as well.

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  • Paypal IPN Confirmation Screen immediately after redirect without reload

    - by Email
    Hi I made a script for IPN which works great but how can i immediately notify the user? I mean paypal redirects the customer to a custom-page i can define, simultanously my ipn.php checked the status, BUT how can i immediately tell the customer on this custom-page that it was successful or not. this custom-page does somehow has to know that this is the customer-xyz which made the ipn-verified!!! payment xyz, but how? i think also this custom-page redirect should wait the 5 seconds because php does only process files/request on-loads... so after 5 seconds the ipnscript surely did complete. Sorry if this question is too newby but i dont know how to notify the customer about the (ipn-verified!!!) payment-status immediately. How do you do this? Thanks so much

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  • Wordpress as CMS, Without Using It As Website Platform

    - by swt
    What is the best method, if there is one, of using Wordpress as a CMS for users to input data while not actually building the website on the Wordpress platform? One possible solution I've found is using a PHP class called "WPGet" (http://peter.upfold.org.uk/projects/wpget) which fetches directly from the database.

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