Simple-Camera | Quick photo and video camera with a flash, customizable aspect ratio | Camera library
kandi X-RAY | Simple-Camera Summary
kandi X-RAY | Simple-Camera Summary
A camera with flash, zoom and no ads. The camera is usable for both photo taking and video recording. You can switch between front and rear camera, modify the save path and limit the resolution. The flash can be turned on and off or used as a flashlight. You can pinch to zoom in and out. If you want to launch this app at pressing the hardware camera button, you might have to disable the built in Camera app in Settings -> Apps -> Camera -> Disable. Contains no ads or unnecessary permissions. It is fully opensource, provides customizable colors. This app is just one piece of a bigger series of apps. You can find the rest of them at
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QUESTION
I am working on adding a simple webcam preview to a UWP app. Getting the preview up and running works fine so I am working on properly handling exceptions thrown by InitializeAsync() and StartPreviewAsync() and am not able to properly catch exceptions for the second one.
I'm basing my code off of Display the camera preview and it says that if an app is not given access to the capture device that it will throw a UnauthorizedAccessException when calling InitializeAsync(). For C++/WinRT that seems to work out to catching an hresult_error code of E_ACCESSDENIED as shown below. I've tested this by turning off access to the webcam in the app options and the try/catch block works just like you would expect with the content dialog popping up and explaining the problem to the user.
The reference also says that if another app has exclusive control of the capture device that StartPreviewAsync() should throw a FileLoadException. To start with, I can't figure out what the C++/WinRT equivalent of that exception is. Secondly, I can't seem to catch any exceptions at all. I tried using the same type of catch block I used for InitializeAsync() since that is what is described in Catching exceptions but when that didn't work I resorted to trying to catch anything with the block below. The docs say you can register for a CaptureDeviceExclusiveControlStatusChanged event when you catch the exception but since I can't catch the exception i'm not sure where an appropriate place to do that would be or if the event fires if my app is launched after another app already has control of the capture device. I never see any text from OutputDebugString() within the catch block but I do get the following message (twice) in the debug output window:
Exception thrown at 0x00007FFC7114A839 (KernelBase.dll) in DBRacing.exe: WinRT originate error - 0xC00D3704 : 'Hardware MFT failed to start streaming due to lack of hardware resources.'.
It seems like the exception is being generated, I just can't seem to catch it for some reason.
In the code below, the methods used with my ViewModel() are just to provide access to local settings where I store the last used device ID and everything works fine when my app has exclusive control of the webcam.
So, my question is: how do I properly identify when another app has exclusive control of the capture device?
I have a private page class variable for the MediaCapture object:
...ANSWER
Answered 2019-Oct-25 at 09:04By my testing, when I first registered for a CaptureDeviceExclusiveControlStatusChanged event before catching the exception, and one of the app have used the camera. After that, I run another app which will also use the same camera, it can catch the exception. You can try to add the event first to test like below and the mediaCapture.Failed event has the same effect.
QUESTION
Im trying to write a custom camera component inside my ReactJS component because i cant seem to find any npm library that really fits my requirement. So i found this article https://frontendnews.io/editions/2018-08-15-simple-camera-component that gives a pretty good details. But i think im having trouble in changing these pure javascript code into React component. I cant seem to render the Camera component inside my page. Plase take a look at my code and see what i did wrong.
Here's my Camera component:
...ANSWER
Answered 2018-Dec-05 at 04:04First thing I notice, you're extending React.Component, but you're missing a call to render()
When you use a Class component, a call to the render() lifecycle method is REQUIRED. Here is some more info on React Components:
When I click the link to the article, I notice that they're making use of web components. You actually don't really need to make any changes to that tutorial's code.
You can use web components in React, see this page in the React docs:
QUESTION
Hello I displayed 1 webcam preview in UWP and that was a success.
But now I want to use 2 camera's preview on my program or be able to choose between the two cameras while connected 2 cameras on computer.
When I run 1 webcam preview, I referred to documentation on using MediaCapture and it was good.
But now I don't know how to display 2 camera previews or select a one between cameras.
Is it impossible?
...ANSWER
Answered 2018-Mar-16 at 08:11Yes, it is possible :-) . The MediaCapture class takes the default camera when you call the InitializeAsync method without parameters, but there is another overload that allows you to specify the device ID.
The documentation shows how to discover video capture devices:
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