Eclipse gives me an error: 

    &#39;&lt;&gt;&#39; operator is not allowed for source level below 1.7	

I guess this is because it is not using java 1.7. Except that it is. At least openjdk 1.7 (my OS is OpenSuse 12.3).

I switched back from kepler to juno to reduce some lags and try to figure out this bug as well, to no avail so far. 

Some things I have tried:
- the default runtime for eclipse is opensdk 1.7 (says so in help, about, installation details)
- project properties, java build -&gt; library. I have manually added the opensdk location.

I would install the oracle version, but there is only 1.6 available from the opensuse repository. I already tried installing the rpm offered by oracle, that didn&#39;t put itself in my path and kind of messed everything up, so I removed that again. 

It should work with openjdk as well no? Or do you think it has a bug?

ps: junit also was not recognised, so I manually linked to the jar file. Perhaps this is relevant information.




openjdk 1.7 in eclipse: operator is not allowed for source level below 1.7

Watching the //BUILD stuff, I saw that WinRT API&#39;s can be consumed by C code:

![enter image description here][1]

I am rather excited about a fresh C API available to Win32 developers.  

Where can I find information on the C WinRT API?  How is it better than the existing Win32 C API?


  [1]: http://i.stack.imgur.com/L4W0H.jpg

Using WinRT from C?

i have a file downloader function:

            HttpClientHandler aHandler = new HttpClientHandler();
            aHandler.ClientCertificateOptions = ClientCertificateOption.Automatic;
            HttpClient aClient = new HttpClient(aHandler);
            aClient.DefaultRequestHeaders.ExpectContinue = false;
            HttpResponseMessage response = await aClient.GetAsync(url);
            InMemoryRandomAccessStream randomAccessStream = new InMemoryRandomAccessStream();

            // To save downloaded image to local storage
            var imageFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(
            filename, CreationCollisionOption.ReplaceExisting);
            var fs = await imageFile.OpenAsync(FileAccessMode.ReadWrite);
            DataWriter writer = new DataWriter(fs.GetOutputStreamAt(0));

            writer.WriteBytes(await response.Content.ReadAsByteArrayAsync());

            await writer.StoreAsync();
            //current.image.SetSource(randomAccessStream);
            writer.DetachStream();
            await fs.FlushAsync();

How can i realize progress bar functionality?
Maybe i can get the writers bytes written so far? Or something?

**P.S. I cant use DownloadOperation(Background transferring) because data from server requests certificate - and this functionality doesn&#39;t exist in DownloadOperations.**

Progress bar with HttpClient

After adding `WindowsRuntime` to a WinForms-project, building the project fails with Error &quot;Must use PackageReference&quot;. The build log is more precise:

&gt;C:\[...]\Visual Studio 2017\Projects\Projectname\packages\Microsoft.Windows.SDK.Contracts.10.0.18362.2005\build\Microsoft.Windows.SDK.Contracts.targets(4,5): error : Must use PackageReference

Here&#39;s what I did:

Install-Package Microsoft.Windows.SDK.Contracts

with references to:

 - C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETCore\v4.5\System.Runtime.WindowsRuntime.dll,
 - C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\Facades\System.Runtime.dll
 - C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\Facades\System.Threading.Tasks.dll
 - C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\Facades\System.IO.dll
 - C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\Facades\System.Runtime.InteropServices.WindowsRuntime.dll.

Is it maybe a thing with the .NET version? In the project&#39;s packages.config there is 4.6 while the project targets 4.5.

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;packages&gt;
    &lt;package id=&quot;Microsoft.Windows.SDK.Contracts&quot; version=&quot;10.0.18362.2005&quot; targetFramework=&quot;net45&quot;/&gt;
    &lt;package id=&quot;System.Runtime.WindowsRuntime&quot; version=&quot;4.6.0&quot; targetFramework=&quot;net45&quot; /&gt;
    &lt;package id=&quot;System.Runtime.WindowsRuntime.UI.Xaml&quot; version=&quot;4.6.0&quot; targetFramework=&quot;net45&quot; /&gt;
    &lt;/packages&gt;

There are no compile errors... only this strange &quot;PackageReference&quot; error.


How to solve the error &quot;Must use PackageReference&quot;?

I&#39;m implementing an API made by other colleagues with Apiary.io, in a Windows Store app project.

They show this example of a method I have to implement:

    var baseAddress = new Uri(&quot;https://private-a8014-xxxxxx.apiary-mock.com/&quot;);

    using (var httpClient = new HttpClient{ BaseAddress = baseAddress })
    {
        using (var response = await httpClient.GetAsync(&quot;user/list{?organizationId}&quot;))
        {
            string responseData = await response.Content.ReadAsStringAsync();
        }
    }

In this and some other methods, I need to have a header with a token that I get before.

Here&#39;s an image of Postman (chrome extension) with the header I&#39;m talking about:
![enter image description here][1]

How do I add that Authorization header to the request?

  [1]: http://i.stack.imgur.com/UE43N.png

Adding headers when using httpClient.GetAsync

Windows 8 introduces WinRT, which is like .NET but unmanaged.
Why is it unmanaged? Is it a performance issue? Does it mean garbage collection is not suitable for lower level APIs?

Why is WinRT unmanaged?

I&#39;m struggling to get my Windows 8 application to communicate with my test web API over SSL.

It seems that HttpClient/HttpClientHandler does not provide and option to ignore untrusted certificates like WebRequest enables you to (albeit in a &quot;hacky&quot; way with `ServerCertificateValidationCallback`).

Any help would be much appreciated!



Allowing Untrusted SSL Certificates with HttpClient

I have an HttpClient that I am using for a REST API. However I am having trouble setting up the Authorization header. I need to set the header to the token I received from doing my OAuth request.
I saw some code for .NET that suggests the following,

    httpClient.DefaultRequestHeaders.Authorization = new Credential(OAuth.token);


However the Credential class does that not exist in WinRT. Anyone have any ideas how to set the Authorization header?

Setting Authorization Header of HttpClient

I have a `List&lt;T&gt;` which is being populated from JSON. I need to convert it into an `ObservableCollection&lt;T&gt;` to bind it to my `GridView`.

Any suggestions?
    

Convert a List&lt;T&gt; into an ObservableCollection&lt;T&gt;

In a situation where you have the UI frontend built using the new Metro style of apps for windows 8, and would like it to communicate with a .NET application running on the desktop on the same local machine (e.g. a windows service app).

What forms of interprocess communication are available between the metro app and the desktop app?

Thanks to Pavel Minaev of the Visual Studio team, who has provided some initial info here in a comment, quoted:

&gt; According to Martyn Lovell, there isn&#39;t any deliberate mechanism for
&gt; that, and some that could be used for it are intentionally restricted.
&gt; Named pipes aren&#39;t there, for example, nor are memory mapped files.
&gt; There are sockets (including server sockets), but when connecting to
&gt; localhost, you can only connect to the same app. You could use normal
&gt; files in one of the shared &quot;known folders&quot; (Documents, Pictures etc),
&gt; but that is a fairly crude hack that necessitates polling and is
&gt; visible to the user. -- [Pavel Minaev](https://stackoverflow.com/users/111335/pavel-minaev) commenting on [this issue](https://stackoverflow.com/questions/7416826/how-does-the-new-windows-8-runtime-compare-to-silverlight-and-wpf)

So failing normal approaches I was thinking of using web services or reading/writing to a database in order to get some form of communication happening, both of which seem like overkill when the processes are running on the same machine.

Is what I&#39;m attempting here making sense? I can see a need for a metro app to be the frontend UI for an existing service which is running on the desktop. Or is it better to just use WPF for the frontend UI running on the desktop (i.e. a non-metro app).

How can a Metro app in Windows 8 communicate with a backend desktop app on the same machine?

I am trying to get an overview of the different technologies,
to use when building GUI&#39;s in the Windows World.

For context, I am building a little 2d platform multiplayer game.
(Just for learning purpose..)

My teacher says that he think that WPF is the right way to go,
but it seems that he only compare it to Windows Forms.

My understading is, that here in 2015, Windows Forms is totally dead?

In this other stackover questions, they say WinRT+XAML is for Metro GUI building(Window 8 tiles thing!), and it seems that WPF is something used only for desktop in Window 7/8 and are close related to Silverlight..

https://stackoverflow.com/questions/7416826/how-does-the-new-windows-8-runtime-winrt-windows-store-apps-compare-to-silve
&gt; - The desktop is where the old apps live (red. WFP). 
&gt; - The new class of applications, Metro applications, can be built in a  number of ways,
&gt; including by VB.NET, C# or C++. These three language options can use
&gt; XAML for building the UI. The alternative is to use
&gt; JavaScript/HTML5/CSS for the development of both the UI and
&gt; application code.


My real question is:
Isn&#39;t there ONE good way to build GUI&#39;s in the Window World?

And if not, which technologies should one use on Window 7, Window 8(Desktop and Metro), Window Phone, (And Windows 10!), and even x-box..

Is it to different technologies to be compared this way?

What do you think is the right thing to invest time in?

Windows GUI: WPF or WinRT (2015+)

How do I remove the box with the 3 icons when debugging?

[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/rhlua.png

How to remove the &quot;Go to live visual tree&quot; / &quot;Enable selection&quot; / &quot;Display layout adorners&quot; overlay when debugging?

I&#39;m building a Windows Store app, and I have some code that needs to be posted to the UI thread.

For that, i&#39;d like to retrieve the CoreDispatcher and use it to post the code.

It seems that there are a few ways to do so:

    // First way
    Windows.ApplicationModel.Core.CoreApplication.GetCurrentView().CoreWindow.Dispatcher;
    
    // Second way
    Window.Current.Dispatcher;


I wonder which one is correct? or if both are equivalent?

Correct way to get the CoreDispatcher in a Windows Store app

I am trying to get my head round the new Windows 8 Runtime that is used to create [Metro][1] style apps. I know you can use it with [XAML][2] and it is based on .NET so C# and VB.NET can be used to write the apps, but then it seems to have something to do with HTML, CSS, DOM, and JavaScript.

Can someone explain what it is in a few paragraphs, in terms that a .NET UI programmer can understand? (I am missing something “key” that is necessary to understand it.)

----------

We all know that WPF, [Silverlight][3], [Windows Forms][4], etc. will keep working under Windows&amp;nbsp;8 (and Windows&amp;nbsp;10) on at least on Intel systems, so please don&#39;t tell me that...

  [1]: https://en.wikipedia.org/wiki/Metro_%28design_language%29
  [2]: http://en.wikipedia.org/wiki/Extensible_Application_Markup_Language
  [3]: http://en.wikipedia.org/wiki/Microsoft_Silverlight
  [4]: http://en.wikipedia.org/wiki/Windows_Forms


How does Windows 8 Runtime (WinRT / Windows Store apps / Windows 10 Universal App) compare to Silverlight and WPF?

How can I run code on the UI thread in WinRT (Windows 8 Metro)?

The `Invoke` method does not exist.


Run code on UI thread in WinRT

I&#39;m writing unit tests for a WinRT app, and I am able to invoke non-async private methods using this:

    TheObjectClass theObject = new TheObjectClass();
    Type objType = typeof(TheObjectClass);
    objType.GetTypeInfo()
           .GetDeclaredMethod(&quot;ThePrivateMethod&quot;)
           .Invoke(theObject, null);

However, if the private method in question is `async`, the code will continue execution without waiting for it to finish.  

How do I add `await` functionality to this?

How to await an async private method invoked using reflection in WinRT?

I keep hitting this problem when I try to debug my Windows 8 apps and there is a copy already installed on another user account:

&gt; DEP0700 : Registration of the app failed. Another user has already installed a packaged version of this app. An unpackaged version cannot replace this. The conflicting package is {{{PackageName}}} and it was published by CN={{{Certificate Stuff}}}. (0x80073cf9)

Sometimes I can just log in or ask someone else to log in to the machine and uninstall the app. Alternatively I can change the application name/id, but one is not always possible and the other is risky (I don&#39;t want to check in the changed application id to source control).

There must be some way to uninstall it. Maybe a PowerShell script?

All Windows Runtime Solutions on Gang of Coders

Total of 17 Windows Runtime Solutions