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  • Serializing JSON string to object

    - by user1476075
    I am trying to parse through a JSON string and convert it to the following POJO: package apicall; //POJO representation of OAuthAccessToken public class OAuthAccessToken { private String tokenType; private String tokenValue; public OAuthAccessToken(String tokenType,String tokenValue) { this.tokenType=tokenType; this.tokenValue=tokenValue; } public String toString() { return "tokenType="+tokenType+"\ntokenValue="+tokenValue; } public String getTokenValue() { return tokenValue; } public String getTokenType() { return tokenType; } } In order to do this I have written the following code: Gson gson=new Gson(); String responseJSONString="{\"access_token\" : \"2YotnFZFEjr1zCsicMWpAA\",\"token_type\" : \"bearer\"}"; OAuthAccessToken token=gson.fromJson(responseJSONString, OAuthAccessToken.class); System.out.println(token); When I run the code, I get the following output: tokenType=null tokenValue=null Instead of tokenType=bearer tokenValue=2YotnFZFEjr1zCsicMWpAA I dont understand if there's anything I've done wrong. Please help.

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  • Problem passing a reference as a named parameter to a variadic function

    - by Michael Mrozek
    I'm having problems in Visual Studio 2003 with the following: void foo(const char*& str, ...) { va_list args; va_start(args, str); const char* foo; while((foo = va_arg(args, const char*)) != NULL) { printf("%s\n", foo); } } When I call it: const char* one = "one"; foo(one, "two", "three", NULL); I get: Access violation reading location 0xcccccccc on the printf() line -- va_arg() returned 0xcccccccc. I finally discovered it's the first parameter being a reference that breaks it -- if I make it a normal char* everything is fine. It doesn't seem to matter what the type is; being a reference causes it to fail at runtime. Is this a known problem with VS2003, or is there some way in which that's legal behavior? It doesn't happen in GCC; I haven't tested with newer Visual Studios to see if the behavior goes away

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  • Best way to test if a generic type is a string? (c#)

    - by Rex M
    I have a generic class that should allow any type, primitive or otherwise. The only problem with this is using default(T). When you call default on a value type or a string, it initializes it to a reasonable value (such as empty string). When you call default(T) on an object, it returns null. For various reasons we need to ensure that if it is not a primitive type, then we will have a default instance of the type, not null. Here is attempt 1: T createDefault() { if(typeof(T).IsValueType) { return default(T); } else { return Activator.CreateInstance<T>(); } } Problem - string is not a value type, but it does not have a parameterless constructor. So, the current solution is: T createDefault() { if(typeof(T).IsValueType || typeof(T).FullName == "System.String") { return default(T); } else { return Activator.CreateInstance<T>(); } } But this feels like a kludge. Is there a nicer way to handle the string case?

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  • Problems after upgrading from 10.04 to 12.04

    - by Paul D
    I upgraded to 12.04.1 from 10.04 recently and am running the Gnome Classic (no effects) desktop. I spent a couple of days tweaking the appearance and behaviour but there are two issues that I can't resolve. The mouse cursor frequently disappears, especially when scrolling through web pages or hovering over links/icons with tooltips. Moving the mouse brings the pointer back but it vanishes again almost immediately. Note I don't have unclutter or Parallels installed. The screen no longer fades to black when left idle for too long - it just cuts out. Bad news when watching content online. Any tips greatly appreciated. Cheers...

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  • mouse and mousepad not working properly

    - by snake
    Ubuntu 12.04 LTS Samsung Q35 The mouse pad has stopped working, only the buttons work. The external mouse is also behaving very oddly, the mouse pointer works, but the button is not working properly, it has to be pressed many times or held down to select anything, and when anything that I select behaves as though the mouse is being clicked all the screen, settings will keep changing, the page will scroll, sliders will move up and down, tabs will toggle etc, so everything is unusable with the mouse, cannot even use the browser as it keeps scrolling the page up and down. I have tested the mouse on another computer, and it works fine. Please bear in mind that I am also a complete Linux novice, I installed Ubuntu on an old laptop for my kids, that is the limit of my experience.

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  • Could not realize media player

    - by user556894
    I am using this code to run avi file using jmf but the error come like "Could not realize media player" and how to open all video format using jmf import javax.media.*; import javax.media.format.*; import java.io.*; import java.util.*; public class Test{ public static void main(String a[]) throws Exception{ CaptureDeviceInfo di = null; Player p = null; Vector deviceList = CaptureDeviceManager.getDeviceList(new AudioFormat("linear", 44100, 16, 2)); if (deviceList.size() > 0){ di = (CaptureDeviceInfo)deviceList.firstElement(); System.out.println((di.getLocator()).toExternalForm()); }else{ System.out.println("Exiting"); System.exit(-1); } try{ p = Manager.createPlayer(di.getLocator()); }catch (IOException e){ System.out.println(e); }catch (NoPlayerException e) { System.out.println(e); } System.out.println("Playing Started"); p.start(); } }

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  • packing fields of a class into a byte array in c#

    - by alex
    Hi all: I am trying to create a fast way to convert c# classes into byte array. I thought of serializing the class directly to a byte array using an example I found: // Convert an object to a byte array private byte[] ObjectToByteArray(Object obj) { if(obj == null) return null; BinaryFormatter bf = new BinaryFormatter(); MemoryStream ms = new MemoryStream(); bf.Serialize(ms, obj); return ms.ToArray(); } But the byte array I got contains some other information that are not related to the fields in the class. I guess it is also converting the Properties of the class. Is there a way to serialize only the fields of the class to a byte array? Thanks

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  • error: incompatible types in assignment

    - by ambika
    My C code #include <stdio.h> #include <stdlib.h> #include "help.h" int test(int x, P *ut) { int point = 10; ut->dt[10].max_x = NULL; } int main(int argc, char** argv) { return (EXIT_SUCCESS); } my help.h file code typedef struct{ double max_x; double max_y; }X; typedef struct{ X dt[10]; }P; I got an error i.e error: incompatible types in assignment error comes in here ut->dt[10].max_x = NULL; can anybody help me. thanks in advance.

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  • Pointers, links, object and reference count

    - by EugeneP
    String a = "a"; // allocate memory and write address of a memory block to a variable String b = "b"; // in a and b hold addresses b = a; // copy a address into b. // Now what? b value is completely lost and will be garbage collected //* next step a = null; // now a does not hold a valid address to any data, // still data of a object exist somewhere, yet we cannot get access to it. Correct me if there's a mistake somewhere in my reflexions. My question is: suppose anInstance object of type Instance has a property ' surname ' anInstance.getSurname() returns "MySurname". now String s = anInstance.getSurname(); anInstance = null; question is - is it true that getSurname value, namely MySurname will not be garbage collected because and only because it has active reference counter 0, and if other properties of anInstance have a zero reference counter, they'll be garbage collected?

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  • using LoadControl with object initializer to create properties

    - by lloydphillips
    In the past I've used UserControls to create email templates which I can fill properties on and then use LoadControl and then RenderControl to get the html for which to use for the body text of my email. This was within asp.net webforms. I'm in the throws of building an mvc website and wanted to do something similar. I've actually considered putting this functionality in a seperate class library and am looking into how I can do this so that in my web layer I can just call EmailTemplate.SubscriptionEmail() which will then generate the html from my template with properties in relevant places (obviously there needs to be parameters for email address etc in there). I wanted to create a single Render control method for which I can pass a string to the path of the UserControl which is my template. I've come across this on the web that kind of suits my needs: public static string RenderUserControl(string path, string propertyName, object propertyValue) { Page pageHolder = new Page(); UserControl viewControl = (UserControl)pageHolder.LoadControl(path); if (propertyValue != null) { Type viewControlType = viewControl.GetType(); PropertyInfo property = viewControlType.GetProperty(propertyName); if (property != null) property.SetValue(viewControl, propertyValue, null); else { throw new Exception(string.Format( "UserControl: {0} does not have a public {1} property.", path, propertyName)); } } pageHolder.Controls.Add(viewControl); StringWriter output = new StringWriter(); HttpContext.Current.Server.Execute(pageHolder, output, false); return output.ToString(); } My issue is that my UserControl(s) may have multiple and differing properties. So SubscribeEmail may require FirstName and EmailAddress where another email template UserControl (lets call it DummyEmail) would require FirstName, EmailAddress and DateOfBirth. The method above only appears to carry one parameter for propertyName and propertyValue. I considered an array of strings that I could put the varying properties into but then I thought it'd be cool to have an object intialiser so I could call the method like this: RenderUserControl("EmailTemplates/SubscribeEmail.ascs", new object() { Firstname="Lloyd", Email="[email protected]" }) Does that make sense? I was just wondering if this is at all possible in the first place and how I'd implement it? I'm not sure if it would be possible to map the properties set on 'object' to properties on the loaded user control and if it is possible where to start in doing this? Has anyone done something like this before? Can anyone help? Lloyd

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  • Nullable enum in html helper

    - by Fabien Piron
    I have a view model that contains enum with nullable type like this one : public StudyLevel? studyLevel { get; set; } I have made custom html helper to display a dropdownlist for rendering the enum into the view, the nullable case is displayed using <option value="null">No value</option> the problem is that when i submit the form modelstate give me the error : studylevel cannot be "null" . Could you suggest me any way to help me handle the nullable type in the view ?

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  • Merge two lists of objects which hold different data

    - by C.McAtackney
    I have an object "Project" which has a number of fields, one of which is "Name". I have one spreadsheet of projects which contains some of these fields, and another which contains the rest. However, Both spreadsheets have the "Name" field. I've read them in and populated two List, only populating the available fields from that particular source. E.g. a Project from List 1 looks like; {Name="MyProj", Type="Form", Priority=NULL}, whereas a Project from List 2 {Name="MyProj", Type=NULL, Priority="High"}. Now, I want to merge these two lists into one in which each Project object has all of its fields populated, with the Name field being used to match the elements. How can I achieve this? Are there any nice ways of doing this concisely? Thanks

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  • Checking lazy loaded properties have been instantiated

    - by PaulG
    In a class which has a lazy loaded property, such as: private Collection<int> someInts; public Collection<int> SomeInts { get { if (this.someInts == null) this.someInts = new Collection<int>(); return this.someInts; } } Is it worth also having a property such as: public bool SomeIntsExist { get { return (this.someInts != null && this.someInts.Count > 0); } } And then using that property.. eg: if (thatClass.SomeIntsExist) { // do something with thatClass.SomeInts collection } or is this premature optimisation. Its certainly easier to roll with something like below, but it will instantiate the collection needlessly: if (thatClass.SomeInts.Count > 0) { // do something with thatClass.SomeInts collection } Is the compiler smart enough to figure things like this out? Is there a better way?

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  • MySQL Query Join Table Selecting Highest Date Value

    - by ALHUI
    Here is the query that I run SELECT cl.cl_id, cc_rego, cc_model, cl_dateIn, cl_dateOut FROM courtesycar cc LEFT JOIN courtesyloan cl ON cc.cc_id = cl.cc_id Results: 1 NXI955 Prado 2013-10-24 11:48:38 NULL 2 RJI603 Avalon 2013-10-24 11:48:42 2013-10-24 11:54:18 3 RJI603 Avalon 2013-10-24 12:01:40 NULL The results that I wanted are to group by the cc_rego values and print the most recent cl_dateIn value. (Only Display Rows 1,3) Ive tried to use MAX on the date and group by clause, but it combines rows, 2 & 3 together showing both the highest value of dateIn and dateOut. Any help will be appreciated.

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  • JFrame does not refresh after deleting an image

    - by dajackal
    Hi! I'm working for the first time with images in a JFrame, and I have some problems. I succeeded in putting an image on my JFrame, and now i want after 2 seconds to remove my image from the JFrame. But after 2 seconds, the image does not disappear, unless I resize the frame or i minimize and after that maximize the frame. Help me if you can. Thanks. Here is the code: File f = new File("2.jpg"); System.out.println("Picture " + f.getAbsolutePath()); BufferedImage image = ImageIO.read(f); MyBufferedImage img = new MyBufferedImage(image); img.resize(400, 300); img.setSize(400, 300); img.setLocation(50, 50); getContentPane().add(img); this.setSize(600, 400); this.setLocationRelativeTo(null); this.setVisible(true); Thread.sleep(2000); System.out.println("2 seconds over"); getContentPane().remove(img); Here is the MyBufferedImage class: public class MyBufferedImage extends JComponent{ private BufferedImage image; private int nPaint; private int avgTime; private long previousSecondsTime; public MyBufferedImage(BufferedImage b) { super(); this.image = b; this.nPaint = 0; this.avgTime = 0; this.previousSecondsTime = System.currentTimeMillis(); } @Override public void paintComponent(Graphics g) { Graphics2D g2D = (Graphics2D) g; g2D.setColor(Color.BLACK); g2D.fillRect(0, 0, this.getWidth(), this.getHeight()); long currentTimeA = System.currentTimeMillis(); //g2D.drawImage(this.image, 320, 0, 0, 240, 0, 0, 640, 480, null); g2D.drawImage(image, 0,0, null); long currentTimeB = System.currentTimeMillis(); this.avgTime += currentTimeB - currentTimeA; this.nPaint++; if (currentTimeB - this.previousSecondsTime > 1000) { System.out.format("Drawn FPS: %d\n", nPaint++); System.out.format("Average time of drawings in the last sec.: %.1f ms\n", (double) this.avgTime / this.nPaint++); this.previousSecondsTime = currentTimeB; this.avgTime = 0; this.nPaint = 0; } } }

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  • MySQL - get all unique values of a column, check if has a specific value

    - by gamers2000
    First off - apologies for the poor title, I have no idea how to describe it in a one-liner. I have a table - snippet is below. mysql> select * from playlistfiles; +-----------------------+--------------+-----------+ | FileName | PlaylistName | FileIndex | +-----------------------+--------------+-----------+ | File1 | Image1 | 0 | | File1 | Video1 | 2 | | File2 | Video1 | 0 | | File3 | Video1 | 1 | | File4 | Image1 | 1 | | File4 | Video1 | 3 | +-----------------------+--------------+-----------+ 6 rows in set (0.00 sec) What I need to do is to get all the FileNames and whether the file is in a playlist or not, as well as order them by FileIndex i.e. for the Image1 playlist, the output should be +-----------------------+------------+-----------+ | FileName | InPlaylist | FileIndex | +-----------------------+------------+-----------+ | File1 | 1 | 0 | | File2 | 0 | Null | | File3 | 0 | Null | | File4 | 1 | 1 | +-----------------------+------------+-----------+ and Video1 would be +-----------------------+------------+-----------+ | FileName | InPlaylist | FileIndex | +-----------------------+------------+-----------+ | File2 | 1 | 0 | | File3 | 1 | 1 | | File1 | 1 | 2 | | File4 | 1 | 3 | +-----------------------+------------+-----------+ In short, I need to be able to get all the unique FileNames from the table, and check if it is in a given table and if so, order it by FileIndex.

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  • In Python, how to use a C++ function which returns an allocated array of structs via a ** parameter?

    - by Jon-Eric
    I'd like to use some existing C++ code, NvTriStrip, in a Python tool. SWIG easily handles the functions with simple parameters, but the main function, GenerateStrips, is much more complicated. What do I need to put in the SWIG interface file to indicate that primGroups is really an output parameter and that it must be cleaned up with delete[]? /////////////////////////////////////////////////////////////////////////// // GenerateStrips() // // in_indices: input index list, the indices you would use to render // in_numIndices: number of entries in in_indices // primGroups: array of optimized/stripified PrimitiveGroups // numGroups: number of groups returned // // Be sure to call delete[] on the returned primGroups to avoid leaking mem // bool GenerateStrips( const unsigned short* in_indices, const unsigned int in_numIndices, PrimitiveGroup** primGroups, unsigned short* numGroups, bool validateEnabled = false ); FYI, here is the PrimitiveGroup declaration: enum PrimType { PT_LIST, PT_STRIP, PT_FAN }; struct PrimitiveGroup { PrimType type; unsigned int numIndices; unsigned short* indices; PrimitiveGroup() : type(PT_STRIP), numIndices(0), indices(NULL) {} ~PrimitiveGroup() { if(indices) delete[] indices; indices = NULL; } };

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  • ExtJS Output JSON

    - by venkatesh a
    This is my Json structure. Got load into the form perfectly. Once i alter this form and click submit button. Output have to save with same structure like existing. Can anyone please help me to solve this ASAP?? { "comment": null, "clientinfo": { "clientName": "Timex", "clientCode": "143", "startDate": "04-Oct-2012", "clientType": "CR", "clientID": "TimexGroup", "hasGAMLeft": null, "gamLocation": "GB", "clientName": "xxx", "groupSegment": "FI", "groupSubSegment": "SUB-FI-SUB", "groupDomicileCounrty": "IN", "groupIsicCode": "2403-Copper & zinc" }, "CompanyClients": [ { "CName": "Timex", "ID": "1424317", "cType": "CR", "gType": "SD" }, { "CName": "Casio", "ID": "1416529", "cType": "AR", "gType": "RD" } ], "Country": [ { "CountryID": "Singapore", "CountryText": "SG" }, { "CountryID": "India", "CountryText": "IN" } ] } I used below code to POST. saves fine as its handcoded. i need to save this dynamically.

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  • Lambda expressions and nullable types

    - by Mathew
    I have two samples of code. One works and returns the correct result, one throws a null reference exception. What's the difference? I know there's some magic happening with capturing variables for the lambda expression but I don't understand what's going on behind the scenes here. int? x = null; bool isXNull = !x.HasValue; // this works var result = from p in data.Program where (isXNull) select p; return result.Tolist(); // this doesn't var result2 = from p in data.Program where (!x.HasValue) select p; return result2.ToList();

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  • Why does $('#id') return true if id doesn't exist?

    - by David
    I always wondered why jQuery returns true if I'm trying to find elements by id selector that doesnt exist in the DOM structure. Like this: <div id="one">one</div> <script> console.log( !!$('#one') ) // prints true console.log( !!$('#two') ) // is also true! (empty jQuery object) console.log( !!document.getElementById('two') ) // prints false </script> I know I can use !!$('#two').length since length === 0 if the object is empty, but it seems logical to me that a selector would return the element if found, otherwise null (like the native document.getElementById does). F.ex, this logic can't be done in jQuery: var div = $('#two') || $('<div id="two"></div>'); Wouldnt it be more logical if the ID selector returned null if not found? anyone?

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  • Hidden Launch Bar wouldn't slide-out when moused over, now it won't hide away.

    - by Dave Keller
    When the launch bar is hidden, I have trouble getting it to slide out when I move the mouse pointer to the left side. After adjusting the settings under Settings--Appearance--Behavior, the bar no longer hides when a browser is open. Is there a fix for this. This all happened when I was looking for a way to change the icon sizes in the launch bar. Documentation from Linux.com told me to do it under Settings--Appearance, but there was no way to do it. Any help is appreciated! Thanks.

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  • How can unit testing make parameter validation redundant?

    - by Johann Gerell
    We have a convention to validate all parameters of constructors and public functions/methods. For mandatory parameters of reference type, we mainly check for non-null and that's the chief validation in constructors, where we set up mandatory dependencies of the type. The number one reason why we do this is to catch that error early and not get a null reference exception a few hours down the line without knowing where or when the faulty parameter was introduced. As we start transitioning to more and more TDD, some team members feel the validation is redundant. Uncle Bob, who is a vocal advocate of TDD, strongly advices against doing parameter validation. His main argument seems to be "I have a suite of unit tests that makes sure everything works". But I can for the life of it just not see in what way unit tests can prevent our developers from calling these methods with bad parameters in production code. Please, unit testers out there, if you could explain this to me in a rational way with concrete examples, I'd be more than happy to seize this parameter validation!

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  • Ad networks that will serve via HTTPS?

    - by Dogweather
    I've built a website with 160K page views per month that serves every page over HTTPS. The recent FireSheep news will probably increase the adoption of "HTTPS everywhere" but it's been very hard to find ad networks and affiliates that will serve their content via HTTPS. I don't want to use these because I don't want my visitors to get "broken security" notification from their browsers (and of course, relevant ads would be a leak of private information). I'm tired of spending a ton of time signing up with ad networks and affiliates only to find out down the road that they don't support HTTPS (e.g. AdSense). Can anyone suggest any options or provide a pointer to a list of these somewhere?

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  • Referring to a non-final variable data inside an inner class

    - by shoaibmohammed
    Im doing a program in GWT. Here is the snippet where Im having problem private String[] populateRSSData() { 1==>> String[] data = null; try { new RequestBuilder(RequestBuilder.GET, "../database.php?action=populaterss").sendRequest(null, new RequestCallback() { @Override public void onResponseReceived(Request request, Response response) { 2==>> data=response.getText().split("~"); } @Override public void onError(Request request, Throwable exception) { Window.alert(exception.getMessage()); } }); } catch (RequestException e) { Window.alert(e.getMessage()); } return data; } Now the problem arises that I get an error that the variable 1==>> data should be declared final. But if I declare it as final then i cannot store the datas in 2==>> The error i get Cannot refer to a non-final variable data inside an inner class defined in a different method RSS_Manager.java Please suggest

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  • Linq to SQL Strange SQL Translation

    - by Master Morality
    I have a simple query that is generating some odd SQL translations, which is blowing up my code when the object is saturated. from x in DataContext.MyEntities select new { IsTypeCDA = x.EntityType == "CDA" //x.EntityType is a string and EntityType.CDA is a const string... } I would expect this query should translate to: SELECT (CASE WHEN [t0].[EntityType] = @p1 THEN 1 ELSE 0 END) as [IsTypeCDA] ... Instead I get this : SELECT (CASE WHEN @p1 = [t0].[EntityType] THEN 1 WHEN NOT (@p1 = [t0].[EntityType]) THEN 0 ELSE NULL END) AS [IsTypeCDA] ... Since I'm saturating a POCO where IsTypeCDA is a bool, it blows up stating I can't assign null to bool. Any thoughts? Edit: fixed the property names so they make sense...

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