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• Determining idle network transfer bandwidth

  - by rwmnau

  I'm building an application that will move around some potentially large files, but I want to do it without disturbing the user's network connection by flooding it. I know that Windows BITS has this kind of functionality, and that's essentially what I'm looking to replicate (as far as the throttling goes). I know BITS has other functionality as well that I'm not interested in, and I also have the option to consume it from .NET, but I'm interested in how it works. I've looked online, and I haven't found a clear explanation of how exactly BITS determines how much bandwidth to consume, aside from a vague "BITS polls activity to watch for a drop in the bandwidth used by other programs." What does this mean? Bandwidth consumed by other programs can drop for a number of other reasons as well - can BITS tell the difference? If I was looking for a process that replicated this "stay just under the radar, where the user won't notice the transfers" functionality, how would I go about doing it?

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• Determining filetype of file in assets folder

  - by ChaimKut

  Question: How do you programmatically distinguish between directories and regular files in the assets folder? When using AssetManager to access files in the assets folder, it seems impossible to determine if a file is in fact a file or a directory. You get the list of files from the list method and then open the file using the open method. I thought perhaps using the openFd method to get the asset file descriptor (and then subsequently requesting the normal file descriptor) would provide me some information. But requesting the file descriptor for a directory results in an IOException (which makes sense since what would it mean for a directory to have a file descriptor...?). Currently I'm relying on that IOException (resulting from attemptng to open a directory in the assets folder) in order to determine if a file is in fact a directory. (Opening a regular file works just fine). This seems like a bad idea. Any other suggestions to distinguish between a file and a directory?

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• Catching an error for a child resource in Ruby on Rails

  - by randombits

  What is the best way to add errors to render if a child resource is really what's having issues and not the parent resource? In english what I mean is the following.. imagine the following code: @foo = Foo.new foochild = Foochild.new // break foochild somehow @foo << foochild @foo.save now when I do: format.xml { render :xml => @foo.errors } I don't get anything about how foochild broke, meaning the error message is useless to the user. How does one go about fixing this?

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• Signal amplitude against time (java)

  - by wsr74ws84

  Hi everyone , I'm racking my brain in order to solve a knotty problem (at least for me) While playing an audio file (using java) I want the signal amplitude to be displayed against time. I mean I'd like to implement a small panel showing a sort of oscilloscope .(SPECTRUM ANALYZER) The audio signal should be viewed in the time domain (vertical axis is amplitude and the horizontal axis is time) Does anyone know how to do it? Is there a good tutorial I can rely on? Since I know vwry little about java , I wish someone could help me . Thanks in advance.

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• How to update a sharepoint list item via web services using a where clause?

  - by JL

  I would like to update a list item using SharePoint and am stuggling to find 1 decent CAML example. Here is what I want to do, in SQL my query would look something like this update [table] set field='value' where fieldID = id; so this would mean I have 1 item in a list I would like to update 1 field on given the ID of that listitem. I've tried this, but it doesn't work: batchElement.InnerXml = "<Method ID='1' Cmd='Update'>" + "<Field Name='DeliveryStatus'>" + newStatus.ToString() + "</Field>" + "<Where><Eq><FieldRef Name='ID' /><Value Type='Text'>" + id + "</Value></Eq></Where></Method>";

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• Where to place a query that should be included in all or most views

  - by Andrew

  In my application I have a sidebar which I want to include a list of pages. Cheating on the MVC setup, I can pretty easily display this as follows (in HAML): # layouts/_sidebar.html.haml %h4 Pages %ul.pages - for page in Page.all %li= link_to page.title, page Now, this works just fine, but clearly it's against the convention. The problem is, this shared layout partial is present in most (but not all) views, and therefore to serve the pages from the controller layer would mean needing to inject an instance variable into almost every controller action in the application. That isn't very clean or DRY. So, how would you handle this kind of situation? Is there a clean, DRY place to put this kind of a simple query that respects Rails MVC convention better?

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• Right rotate of tree in Haskell: how is it work?

  - by Roman

  I don't know haskell syntax, but I know some FP concepts (like algebraic data types, pattern matching, higher-order functions ect). Can someone explain please, what does this code mean: data Tree ? = Leaf ? | Fork ? (Tree ?) (Tree ?) rotateR tree = case tree of Fork q (Fork p a b) c -> Fork p a (Fork q b c) As I understand, first line is something like Tree-type declaration (but I don't understand it exactly). Second line includes pattern matching (I don't understand as well why do we need to use pattern matching here). And third line does something absolutely unreadable for non-haskell developer. I've found definition of Fork as fork (f,g) x = (f x, g x) but I can't move further anymore.

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• question about working with System.Drawing.Graphics

  - by backdoor

  hi all. i have a System.Drawing.Point[] filled with some System.Drawing.Point's. so when i want to draw this points as a polygon in a System.Windows.Form instance , the final drawn polygon is not all in the screen or sometimes is very small (in screen shown as 2-3 pixel). i wonder if there is some Library that using that i can just send Point[] to that and thatself scales and ... points and draws polygon manner that all points shown in screen and they are scaled to fit the screen (i mean small objects that shown as 2-3 pixel scale up to fit entire screen); thaks all and sorry for my bad english...

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• Is it possible to have a Shared/Static Dependency Property?

  - by Matt H.

  [using VB.NET, but I can easily read C# code in responses] I have a class called QuestionClipboard with ALL shared methods/properties. I previously had a QuesitonClipboard.doesClipboardHaveContent function that returned true/false if there was a Object on my 'clipboard'. I'd prefer to implement a Dependency Property so I can allow this true/false value to participate in data binding. The "GetValue(dp as DependencyProperty)" method requires an object instance, which would mean that my Property CAN'T be shared! Here is what the code would look like in my perfect world... Of course, the word "Shared" before the property declaration renders this code useless. Private Shared clipboardHasContentPropertyKey As DependencyPropertyKey = DependencyProperty.RegisterReadOnly("clipboardHasContent", GetType(Boolean), GetType(QuestionClipboard), _ New PropertyMetadata(False, Nothing, New CoerceValueCallback(AddressOf coerceClipboardHasContent))) Private Shared clipboardHasContentProperty As DependencyProperty = clipboardHasContentPropertyKey.DependencyProperty Public SHARED Property clipboardHasContent As Boolean Get Return GetValue(clipboardHasContentProperty) End Get Set(ByVal value As Boolean) SetValue(value) End Set End Property

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• Using exponential smoothing with NaN values

  - by Eric

  I have a sample of some kind that can create somewhat noisy output. The sample is the result of some image processing from a camera, which indicates the heading of a blob of a certain color. It is an angle from around -45° to +45°, or a NaN, which means that the blob is not actually in view. In order to combat the noisy data, I felt that exponential smoothing would do the trick. However, I'm not sure how to handle the NaN values. On the one hand, involving them in the math would result in a NaN average, which would then prevent any meaningful results. On the other hand, ignoring NaN values completely would mean that a "no-detection" scenario would never be reported. And just to complicate things, the data is also noisy in that it can get false NaN value, which ideally would be smoothed somehow to prevent random noise. Any ideas about how I could implement such an exponential smoother?

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• "derivative work" and the consumption of web services

  - by yodaj007

  From the Wowhead Terms of Service: "Intellectual Property Rights The Service and any necessary software used in connection with the Service ("Software") contain proprietary and confidential information that is protected by applicable intellectual property and other laws. You agree not to modify, rent, lease, loan, sell, distribute or create derivative works based on the Service or the Software, in whole or in part." Does this mean that I can't write a program to consume a web service being published by the writers of this TOS? I find it kind of scary that I even have to ask this question. The wikipedia article on "derivative works" isn't very conclusive.

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• iOS - Application logging test and production code

  - by Peter Warbo

  I am doing a bunch of logging when I'm testing my application which is useful for getting information about variable state and such. However I have read that you should use logging sparsely in production code (because it can potentially slow down your application). But my question is now: if my app is in production and people are using it, whenever a crash (god forbid) occurs, how will I be able to interpret the crash information if I have removed the logging statements? Then I suppose I will only have a stacktrace for me to interpret? Does this mean I should leave logging in production code only WHERE it's really essential for me to interpret what has happened? Also how will the logging statements relate to the crash reports? Will they be combined? I'm thinking of using Flurry as analytics and crash reports...

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• looking for help with Flash sound to play on an iPad

  - by phm

  I hope you might be willing to help me. Years ago, when I was designing a game site, it was recommended to me to do what you pretty much suggested in your answer to a question about Flash sound: put my sound effects as Flash elements. This works great on every platform except the iPad. Do you have any idea what I should do? I'd really appreciate your help and you sound like a helpful person. Some people here can be kind of mean. I'm not a programmer by training, just self taught.

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• Reload Document into Google Docs Viewer (Clear Cache)

  - by Adam

  Google Docs Viewer (http://docs.google.com/viewer) creates a cache of a document after the first viewing. To see what I mean, try the following: Upload file.pdf to your server (i.e., http://example.com). Visit http://docs.google.com/viewer?url=http://example.com/file.pdf Upload a new file to replace file.pdf (but use the same name). Revisit http://docs.google.com/viewer?url=http://example.com/file.pdf. Google Docs Viewer still shows the old file.pdf. Anyone know how to correct this? (I have already tried clearing browser cache, switching browsers, and logging in with a different google account to view the link.)

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• Visual Studio - easy way to bring up type definition as source code

  - by Igor Zevaka

  Oftentimes I want to bring up a system class in a source view, so that I can browse the properties and methods exposed by the class in a source view. Below is the screenshot of what I mean: Usually I do this by selecting the class name and pressing F12 (or right clickGo To Definition). However, if I haven't got it anywhere ready, i have type it up and then do Go To Definition. Most of the time I have to delete what I typed later on. Is there a way to bring up this view without having to type the class name? The VS2010 Navigate To dialog doesn't support this.

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• Job hopping etiquette

  - by Paul Tomblin

  I need to get out of a bad situation at my current work - I like the work, but they've been jerking me around with contract extensions coming at the last minute. I've been offered a job at a different company that doesn't look as interesting, but it's a chance to learn a few technologies I was interested in learning. It's "6 months contract to permanent" - does that mean that if I decide it's hopelessly boring and quit after the 6 month contract period that it won't reflect too badly on me and ruin my reputation in the town? What if I quit earlier than that? Edit I should mention that I don't think there will be one right answer, so rather than accepting one answer, I'm going to vote up the good ones.

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• Java: Selected rows's index does not changes when I sort them!

  - by adrian7

  Hello, I have a Jtable on which I called the method table1.setAutoCreateRowSorter(true);. So this works on well. But I also have a methos in my JFrame class which is fired when i push a button. It gets the selected rows indexes using this code int selectedRows[] = this.table1.getSelectedRows();. And displays an edit window for the first row corresponding in the selected interval. The problem is that if I don't click on column's headers (I mean i don't sorte them at all) my method works perfect. But when I sort the row, the indexes of the rows doesn't seems to change at all - thus resulting an edit window for the old row whicn was initially in that position before making any sort. I am using JDK 6 could anyonw give ma a tip?

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• Unit Testing User Interface. What is an effective way ?

  - by pierocampanelli

  I have an accounting & payroll client/server application where there are several input form with complex data validation rules. I am finding an effective way to perform unit testing of user interface. For complex validation rules I mean: "Disable button X if I Insert a value in textfield Y" "Enable a combobox if I insert a value in a textfield" ...... ...... Most promising pattern i have found is suggested by M. Fowler (http://martinfowler.com/eaaDev/ModelViewPresenter.html). Have you any experience about Unit Testing of User Interface? As technology stack I am using: .NET 3.5 & Windows Forms Widget Library.

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• "Personal" method in ruby

  - by steve gooberman-hill

  I'm looking for a way of making a method "personal" - note NOT PRIVATE to a class here is an example - by "personal" I mean the behaviour of method "foo" class A def foo "foo" end end class B < A def foo "bar" end end class C < B end a=A.new; b=B.new;c=C.new I'm looking for a way of producing the following behaviour a.foo #=> "foo" b.foo #=> "bar" c.foo #=> "foo" (ultimate base class method called) Any ideas? Thanks Steve

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• static const C++ class member initialized gives a duplicate symbol error when linking

  - by Petruza

  I have a class which has a static const array, it has to be initialized outside the class: class foo{ static const int array[3]; }; const int foo::array[3] = { 1, 2, 3 }; But then I get a duplicate symbol foo::array in foo.o and main.o foo.o hold the foo class, and main.o holds main() and uses instances of foo. How can I share this static const array between all instances of foo? I mean, that's the idea of a static member.

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• Stop sign icon in VS2005 Express solution explorer

  - by Andy Bisson

  What does a small stop sign icon on a file in solution explorer mean? Someone asked the same question a year ago Original Question but the answer provided is of no help. The icon looks like this: Suffice to say that the sign is not one presented in the VS documentation and is a UK Stop sign (red circle with a white horizontal bar) not a US one. The project is WebKit and the build process cannot find AuthenticationCF.h even though the file is present. I presume the sign might shed some light on this. Thanks, Andy

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• Inserting into an Associative array?

  - by RedShft

  I'm playing around with associative arrays right now and I can't seem to figure out how to add additional objects to the array. I tried insert but it doesn't recognize both arguments. Also, if I do this it produces an error: Node[bool] test; Node node; Node[bool] temp = [ false:node ]; test ~= temp; //Error 1 Error: cannot append type Node[bool] to type //Node[bool] C:\Users\CP\Documents\Visual Studio //2010\Projects\D\STDS\NPC.d 256 Does this mean you can't use the append operator on associative arrays ?

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• Best approach to send data from a server to an Android device

  - by ElectricDialect

  I am developing an Android app that needs to communicate bi-directionally with a server. By that, I mean either the server or the device can send a message at any time, with an arbitrary amount of time in between messages. Sending data from the device to the server is a common and I think well understood task, but I'm not as sure what the best approach is to go in the opposite direction from the server to the device. I think having the device periodically poll the server may be a bad idea due to latency and the drain on the battery, but I'd be willing to consider this option. My plan at the moment is to send text messages from the server via an email-to-SMS bridge, and to have my app run a service to receive and handle these messages. The question I have is if there are any best practices for this scenario, and if using text messages has some downsides that I have failed to consider. For the sake of this question, I want to assume that users have an unlimited text data plan, so paying per text won't be an issue.

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• UIActivityIndicator not working properly?

  - by medma

  Hello frends, I have a problem regarding UIActivityIndicator. I applied "[spinner startAnimating]" at the IBAction on a button and then doing some process. After the process activityindicator should be stopped and then navigate to another view. But the activity indicator does not appear. When I remove the line "[spinner stopAnimating]" then the indicator appears but not at the instant button is pressed. It appears just before the other view loads, and apparently does not appear, I mean it does not appear but if we see very carefully then only it appears for an instant. Thanx in advance for any answer.

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• MongoDB map/reduce counts

  - by ibz

  The output from MongoDB's map/reduce includes something like 'counts': {'input': I, 'emit': E, 'output': O}. I thought I clearly understand what those mean, until I hit a weird case which I can't explain. According to my understanding, counts.input is the number of rows that match the condition (as specified in query). If so, how is it possible that the following two queries have different results? db.mycollection.find({MY_CONDITION}).count() db.mycollection.mapReduce(SOME_MAP, SOME_REDUCE, {'query': {MY_CONDITION}}).counts.input I thought the two should always give the same result, independent of the map and reduce functions, as long as the same condition is used.

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