I am developing a Flash application (Flash Player 11 as target platform) that uses the AS3 Facebook API, which in turn uses as3corelib JSON functionality. Or at least it should do so.
However, in spite of including the latest version (.93) of the as3corelib.swc, I still get the "Error: Access of undefined property JSON". I also tried including the sources directly, to no avail.
Any ideas what I am doing wrong?
As I said, the *.swc is definitely included. As is the source code (all at the correct path).
Edit:
I have a more specific error message:
Error: Can not resolve a multiname reference unambiguously. JSON (from C:\Coding\FlashDevelop\Tools\flexsdk\frameworks\libs\air\airglobal.swc(JSON, Walker)) and com.adobe.serialization.json:JSON (from C:\flash_test\lib\as3corelib.swc)) are available.
I know that JSON is included in AIR, but I do not target AIR, so why does it try include the airglobal.swc?
Your problem is that Flash Player 11 and onwards has native JSON support, so the JSON class you are including is likely colliding with the one from as3corelib. Hence the ambiguity problem.
Try removing as3corelib entirely and see what happens.
Specify the full path to the class. Example, code:
...
var jsonData:Object = JSON.decode(loader.data);
...
will be
...
var jsonData:Object = com.adobe.serialization.json.JSON.decode(loader.data);
...
Related
I get this error because I have circular references defined in my object model. My question is, is there any way to resolve this using one of the following two options?
Using Newtonsoft.Json and options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
Using System.Text.Json and options.JsonSerializerOptions.ReferenceHandler = System.Text.Json.Serialization.ReferenceHandler.Preserve;
I'm not seeing a way to switch to Newtonsoft.Json in a Blazor WebAssembly application and I tried implementing option 2 in the ConfigureServices function of Startup.cs in my Server project but I still kept getting the error.
I'm just trying to find a solution that doesn't require me redefining my object model. The JsonIgnore attribute does not appear to be an option either because I assume, and it appears, that then any fields I define it on do not exist in the Json on the client which breaks my application.
Update: I found this site which looks to me like discusses exactly what I'm referring to here and how to implement the solution but I have not got it to work yet. If anyone is successfully using Blazor WebAssembly with circular references in your object model please let me know what you're doing.
https://github.com/dotnet/aspnetcore/issues/28286
Thank you for pointing out this error in Blazor. I found the answer in the issue you mentioned (this comment). You need to change json options also on the Client side. This works for me:
On server
services.AddControllersWithViews().AddJsonOptions(options =>
{
options.JsonSerializerOptions.ReferenceHandler = System.Text.Json.Serialization.ReferenceHandler.Preserve;
options.JsonSerializerOptions.PropertyNamingPolicy = null;
});
On client
var response = await Http.GetFromJsonAsync<T>("{Address}", new JsonSerializerOptions
{
ReferenceHandler = System.Text.Json.Serialization.ReferenceHandler.Preserve,
PropertyNamingPolicy = null
});
To the two options you mentioned there is a third option available if you use .NET 6 or above.
Using System.Text.Json and options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles;
Beware that ignoring cycles have issues on its own (such as data corruption) but if you were depending on it when you were using Newtonsoft.Json then you will be fine as it is basically the same behavior.
If you prefer to go with ReferenceHandler.Preserve, please share more info on what error you are getting and I can try to help you out.
One way to go about this is specify how much depth an object is allowed to have. Please see the documentation here regarding how to do this with System.Text.Json. I think this may help.
I want to be able to encode video frames using Media Foundation IMFTransform for H264 Video Encoding. That's easily doable in Win32, where you can use MFTEnumEx to enumerate the transforms and find the H264 encoder.
However, on WinRT (Store Apps), I can't find a way to instantiate.
I've noticed there's a class CMSH264EncoderMFT, but there's no definition for the CLSID to use on CoCreateInstance.
With:
CoCreateInstance(CLSID_CMSH264EncoderMFT, nullptr, CLSCTX_INPROC_SERVER, __uuidof(IUnknown), (void **)&pUnknown);
CLSID_CMSH264EncoderMFT is undefined for WinRT apps.
And tried:
ComPtr<CMSH264EncoderMFT> encoder = Make<CMSH264EncoderMFT>();
It says the class CMSH264EncoderMFT is incomplete, and says "use of undefined type 'CMSH264EncoderMFT'". Don't even know if the syntax for Make is correct or appropriate...
Does anyone have a clue on how to do this for WinRT?
Use MFCreateSinkWriterFromURL to create a file writer first. Then, use MFCreateMediaType to create an IMFMediaType. Set up its properties, one of which will be the output format: use SetGUID method on the media type with MF_MT_SUBTYPE guid and specify MFVideoFormat_H264 as the argument. Finally, use AddStream method on the sink writer to set the media type to it.
There's an example here (you'll need to modify it a bit when it sets MF_MT_SUBTYPE).
you cannot instantiate object via CMSH264EncoderMFT because it DOES NOT have some interfaces which MUST have object in WinRT for example IInspectable - Provides functionality required for all Windows Runtime classes. CMSH264EncoderMFT IS NOT WinRT class. You can try resolve your task by function MFCreateSinkWriterFromMediaSink - this function takes an object with interface IMFMediaSink. It is possible write code for object with IMFMediaSink interface and receive samples from IMFTransform::ProcessOutput. I just point your attention - you cannot instantiate in WindowsStore code objects which IS NOT Windows Runtime classes.
Regards,
Evgeny Pereguda
My app runs in WPF and Android (Windows Phone later) with mvvmcross as framework. I implemented localization with JsonLocalisation like the Babel (N21) example and it is working fine in Android. But whatever I try in WPF I get this message;
mvx:Warning: 0,22 Language file could not be loaded for Danish.SettingsViewModel -
FileNotFoundException: Unable to find resource file MyAppResources/Text/Danish/SettingsViewModel.json
at Cirrious.MvvmCross.Plugins.JsonLocalisation.MvxContentJsonDictionaryTextProvider.
LoadJsonFromResource(String namespaceKey, String typeKey, String resourcePath) at >Cirrious.MvvmCross.Plugins.JsonLocalisation.MvxTextProviderBuilder.LoadResources(String >whichLocalisationFolder)"
Stuart says in his video tutorial that the json translation files must be included as "Content" and not copied to the output folder - like;
But looking at the compiled executable with "dotPeek" doesn't reveal the files.
Am I missing something obvious? Any hints would be highly appreciated. Even confirmation from somebody who has JsonLocalisation working in WPF would be nice.
EDIT:
Well, I tried this code in my WPF mainWindow. I understand this call is used internally in MvxWPFResourceLoader.
public MainWindow()
{
....
//This return null without exceptions.
var t = Application.GetResourceStream(new Uri("MyAppResources/Text/Danish/SettingsViewModel.json", UriKind.Relative));
//This throwns an IOException; Cannot locate resource 'thisdoesnotexist/text/danish/settingsviewmodel.json'.
var y = Application.GetResourceStream(new Uri("ThisDoesNotExist/Text/Danish/SettingsViewModel.json", UriKind.Relative));
}
It seems when the path if wrong an exception is thrown. When it is correct it just returns null!!?! I am a bit puzzled, any ideas?
Best regards
Thank you for such fast answer (and for mvvmcross!).
The link you provided is to a Babel solution with a WPF sample - exactly what I needed. I mistakenly used the one from N21 without WPF sample :-)
Anyway, when looking at the sample I noticed that the json files must be included as 'Resource' and not 'Content'. That made all the difference - hurray!
Best regards
I'm trying to create an application using the NFC (proximity) API on Windows Phone 8. When I copy the example code from the documentation, I get the following compile error...
error CS0103: The name 'Window' does not exist in the current context ...
This error is all over the internet and the common solution seems to be that it only works for native (or C++) code. However the documentation says that it works for managed or native code. How do I get the examples to work in my managed code?
In order to gain access to the active Windows.UI.Core.CoreDispatcher object, you simply need to request Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher.
ORIGINAL EXAMPLE CODE
// Write a message to MessageBlock on the UI thread.
private Windows.UI.Core.CoreDispatcher messageDispatcher =
Window.Current.CoreWindow.Dispatcher;
CORRECTED CODE
// Write a message to MessageBlock on the UI thread.
private Windows.UI.Core.CoreDispatcher dispatcher =
Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher;
The one small change makes all the examples work! Enjoy.
My requirement is to instantiate an object using new ActiveX() in html.
I have created a COM component SimpleActiveX using ATL. I have created the dll SimpleActiveX.dll for the same. In order to instantiate this component in html file I need to register the dll. So I registered the dll using the command regsvr32 %Path of dll%.
After doing so I am trying to create and instance of the component in html file as follows,
var req;
req = new ActiveX("SimpleActiveX.Hello"); //Assume Hello as a class.
req.Hi(); //Assume that Hi() is a member function of Hello.
By doing so I am unable to create the ActiveX object.
Html doesnt give any error too. I dont know whether I am doing anything wrong or am I missing anything.
Could anyone please tell me the proper steps to perform above operations.
How do I need to create the dll (Here in this case I have just build the ATL project in Visual Studio to generate the dll)?
What else do I need to do with the dll in case if I need to create an ActiveX object in html?
I had come across something called as <object> </object> tag in html where we mention the classid and attributes. I dont know whether I need to mention this in my html file or not.
Thanks for your help in advance.
To instantiate an ActiveX object in JavaScript, assuming the dll is correctly registered, you just have to use:
var req = new ActiveXObject("SimpleActiveX.Hello");
Unfortunately I don't know how to register a dll using Visual Studio.
Regarding the tag, it is used when you want to embed the object directly in your HTML code, so that it will be instantiated when the document loads, instead of using JavaScript.
For example:
<object id="myObject" classid="CLSID:2D360200-FFF5-11D1-8D03-00A0C959BC0A"></object>
Then you can access the COM object with
var myObject = document.getElementById("myObject").object