此处将为大家介绍关于无法使用AVCapturePhotoOutput捕获照片swift+Xcode的详细内容，并且为您解答有关br2021提示无法使用cameraraw的相关问题，此外，我们还将为您介

此处将为大家介绍关于无法使用AVCapturePhotoOutput捕获照片swift + Xcode的详细内容，并且为您解答有关br2021提示无法使用camera raw的相关问题，此外，我们还将为您介绍关于asp.net-mvc-3 – 为什么在使用Azure缓存(.NET MVC3应用程序)时无法组合[Authorize]和[OutputCache]属性？、AVCaptureInput和AVCaptureOutput子类、AVCaptureVideoDataOutputSampleBufferDelegate.CaptureOutput 未在 Swift 中调用、AVCaptureVideoDataOutput在iOS 14中停止传递帧的有用信息。

• 无法使用AVCapturePhotoOutput捕获照片swift + Xcode（br2021提示无法使用camera raw）
• asp.net-mvc-3 – 为什么在使用Azure缓存(.NET MVC3应用程序)时无法组合[Authorize]和[OutputCache]属性？
• AVCaptureInput和AVCaptureOutput子类
• AVCaptureVideoDataOutputSampleBufferDelegate.CaptureOutput 未在 Swift 中调用
• AVCaptureVideoDataOutput在iOS 14中停止传递帧

无法使用AVCapturePhotoOutput捕获照片swift + Xcode（br2021提示无法使用camera raw）

我正在使用自定义相机应用程序，本教程使用的是iOS 10弃用的AVCaptureStillImageOutput。我已经设置了相机，现在只能使用如何拍照了。

这是我有相机的全景

import UIKitimport AVFoundationvar cameraPos = "back"class View3: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {@IBOutlet weak var clickButton: UIButton!@IBOutlet var cameraView: UIView!var session: AVCaptureSession?var stillImageOutput: AVCapturePhotoOutput?var videoPreviewLayer: AVCaptureVideoPreviewLayer?override func viewDidLoad() {    super.viewDidLoad()        }override func didReceiveMemoryWarning() {    super.didReceiveMemoryWarning()}override func viewDidAppear(_ animated: Bool) {    super.viewDidAppear(animated)    clickButton.center.x = cameraView.bounds.width/2    loadCamera()}override func viewWillAppear(_ animated: Bool) {    super.viewWillAppear(animated) }@IBAction func clickCapture(_ sender: UIButton) {    if let videoConnection = stillImageOutput!.connection(withMediaType: AVMediaTypeVideo) {       // This is where I need help         }}@IBAction func changeDevice(_ sender: UIButton) {    if cameraPos == "back"    {cameraPos = "front"}    else    {cameraPos = "back"}    loadCamera()}func loadCamera(){    session?.stopRunning()    videoPreviewLayer?.removeFromSuperlayer()    session = AVCaptureSession()    session!.sessionPreset = AVCaptureSessionPresetPhoto    var backCamera = AVCaptureDevice.defaultDevice(withDeviceType: .builtInWideAngleCamera, mediaType: AVMediaTypeVideo, position: .front)    if cameraPos == "back"    {        backCamera = AVCaptureDevice.defaultDevice(withDeviceType: .builtInWideAngleCamera, mediaType: AVMediaTypeVideo, position: .back)    }    var error: NSError?    var input: AVCaptureDeviceInput!    do {        input = try AVCaptureDeviceInput(device: backCamera)    } catch let error1 as NSError {        error = error1        input = nil        print(error!.localizedDescription)    }    if error == nil && session!.canAddInput(input) {        session!.addInput(input)        stillImageOutput = AVCapturePhotoOutput()if session!.canAddOutput(stillImageOutput) {            session!.addOutput(stillImageOutput)            videoPreviewLayer = AVCaptureVideoPreviewLayer(session: session)            videoPreviewLayer?.frame = cameraView.bounds            videoPreviewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill            videoPreviewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait            cameraView.layer.addSublayer(videoPreviewLayer!)            session!.startRunning()        }        }}}

这是我需要帮助的地方

@IBAction func clickCapture(_ sender: UIButton) {if let videoConnection = stillImageOutput!.connection(withMediaType: AVMediaTypeVideo) {   // This is where I need help     }}

我已经在这里回答了如何使用AVCapturePhotoOutput，但是我不明白如何在该代码中合并该代码，因为它涉及到声明一个新类。

答案1

你快到了。

输出为 AVCapturePhotoOutput

查看AVCapturePhotoOutput
文档以获取更多帮助。

这些是拍摄照片的步骤。

1. 创建一个AVCapturePhotoOutput对象。使用其属性来确定支持的捕获设置并启用某些功能（例如，是否捕获实时照片）。
2. 创建并配置AVCapturePhotoSettings对象以选择特定捕获的功能和设置（例如，启用图像稳定还是闪光灯）。
3. 通过将照片设置对象capturePhoto(with:delegate:)与实现AVCapturePhotoCaptureDelegate协议的委托对象一起传递给方法来捕获图像 。然后，照片捕获输出将呼叫您的代表，以在捕获过程中将重大事件通知您。

在您的clickCapture方法上具有以下代码，并且不要忘记在类中进行确认和实现委托。

let settings = AVCapturePhotoSettings()let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!let previewFormat = [kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,                             kCVPixelBufferWidthKey as String: 160,                             kCVPixelBufferHeightKey as String: 160,                             ]settings.previewPhotoFormat = previewFormatself.cameraOutput.capturePhoto(with: settings, delegate: self)

输出为 AVCaptureStillImageOutput

如果您打算通过视频连接拍摄照片。您可以按照以下步骤操作。

步骤1：建立连线

if let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo) {  // ...  // Code for photo capture goes here...}

步骤2：拍摄相片

• 在captureStillImageAsynchronouslyFromConnection上调用该函数stillImageOutput。
• 的sampleBuffer表示被捕捉的数据。

stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: { (sampleBuffer, error) -> Void in  // ...  // Process the image data (sampleBuffer) here to get an image file we can put in our captureImageView})

步骤3：处理图像数据

• 我们将需要采取一些步骤来处理在sampleBuffer中找到的图像数据，以便最终获得一个UIImage，我们可以将其插入到captureImageView中并在应用程序的其他位置轻松使用。

if sampleBuffer != nil {  let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)  let dataProvider = CGDataProviderCreateWithCFData(imageData)  let cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, CGColorRenderingIntent.RenderingIntentDefault)  let image = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)  // ...  // Add the image to captureImageView here...}

步骤4：储存图片

根据您的需要将图像保存到照片库或在图像视图中显示

有关更多详细信息，请查看 “ 捕捉照片” 下的“
创建自定义相机视图指南 ”。 __

asp.net-mvc-3 – 为什么在使用Azure缓存(.NET MVC3应用程序)时无法组合[Authorize]和[OutputCache]属性？

[ActionName("sample-cached-page")]
[OutputCache(Duration = 300,varyByCustom = "User",Location = OutputCacheLocation.Server)]
[Authorize(Users = "me@mydomain.tld,another@otherdomain.tld")]
public virtual ActionResult SampleCachedPage()
{
    return View();
}

System.Configuration.Provider.ProviderException: When using a custom output cache provider like 'distributedCache',only the following expiration policies and cache features are supported: file dependencies,absolute expirations,static validation callbacks and static substitution callbacks.

System.Configuration.Provider.ProviderException: When using a custom output cache provider like 'distributedCache',only the following expiration policies and cache features are supported:  file dependencies,static validation callbacks and static substitution callbacks.
   at System.Web.Caching.OutputCache.InsertResponse(String cachedvaryKey,Cachedvary cachedvary,String rawResponseKey,CachedRawResponse rawResponse,CacheDependency dependencies,DateTime absExp,TimeSpan slidingExp)
   at System.Web.Caching.OutputCacheModule.OnLeave(Object source,EventArgs eventArgs)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,Boolean& completedSynchronously)

public override string GetvaryByCustomString(HttpContext context,string custom)
{
    return "User".Equals(custom,StringComparison.OrdinalIgnoreCase)
        ? Thread.CurrentPrincipal.Identity.Name
        : base.GetvaryByCustomString(context,custom);
}

if (AuthorizeCore(filterContext.HttpContext)) {
    // ** IMPORTANT **
    // Since we're performing authorization at the action level,the authorization code runs
    // after the output caching module. In the worst case this Could allow an authorized user
    // to cause the page to be cached,then an unauthorized user would later be served the
    // cached page. We work around this by telling proxies not to cache the sensitive page,// then we hook our custom authorization code into the caching mechanism so that we have
    // the final say on whether a page should be served from the cache.

    HttpCachePolicyBase cachePolicy = filterContext.HttpContext.Response.Cache;
    cachePolicy.SetProxyMaxAge(new TimeSpan(0));
    cachePolicy.AddValidationCallback(CacheValidateHandler,null /* data */);
}
else {
    HandleUnauthorizedRequest(filterContext);
}

/// <summary>
/// Uses injected authorization service to determine if the session user 
/// has necessary role privileges.
/// </summary>
/// <remarks>As authorization code runs at the action level,after the 
/// caching module,our authorization code is hooked into the caching 
/// mechanics,to ensure unauthorized users are not served up a 
/// prior-authorized page. 
/// Note: Special thanks to TheCloudlessSky on StackOverflow.
/// </remarks>
public void OnAuthorization(AuthorizationContext filterContext)
{
    // User must be authenticated and Session not be null
    if (!filterContext.HttpContext.User.Identity.IsAuthenticated || filterContext.HttpContext.Session == null)
        HandleUnauthorizedRequest(filterContext);
    else {
        // if authorized,handle cache validation
        if (_authorizationService.IsAuthorized((UserSessionInfoviewmodel)filterContext.HttpContext.Session["user"],_authorizedRoles)) {
            var cache = filterContext.HttpContext.Response.Cache;
            cache.SetProxyMaxAge(new TimeSpan(0));
            cache.AddValidationCallback((HttpContext context,object o,ref HttpValidationStatus status) => AuthorizeCache(context),null);
        }
        else
            HandleUnauthorizedRequest(filterContext);             
    }
}

/// <summary>
/// Ensures that authorization is checked on cached pages.
/// </summary>
/// <param name="httpContext"></param>
/// <returns></returns>
public HttpValidationStatus AuthorizeCache(HttpContext httpContext)
{
    if (httpContext.Session == null)
        return HttpValidationStatus.Invalid;
    return _authorizationService.IsAuthorized((UserSessionInfoviewmodel) httpContext.Session["user"],_authorizedRoles) 
        ? HttpValidationStatus.Valid 
        : HttpValidationStatus.IgnoreThisRequest;
}

AVCaptureInput和AVCaptureOutput子类

1、AVCaptureInput

AVCaptureDeviceInput：用于从AVCaptureDevice对象捕获数据。

 AVCaptureScreenInput：从macOS屏幕上录制的一种捕获输入。

 AVCaptureMetadataInput：它为AVCaptureSession提供AVMetadataItems。AVCaptureMetadataInputs呈现了一个且只有一个AVCaptureInputPort，它目前可能只连接到AVCaptureMovieFileOutput。通过输入端口提供的元数据由客户机提供，并且必须符合客户机提供的CMFormatDescription。AVMetadataItems在AVTimedMetadataGroup中提供。

2、AVCaptureOutput

 AVCaptureAudioDataOutput ：一种捕获输出，用于记录音频，并在录制音频时提供对音频样本缓冲区的访问。

 AVCaptureAudioPreviewOutput ：一种捕获输出，与一个核心音频输出设备相关联、可用于播放由捕获会话捕获的音频。

 AVCaptureDepthDataOutput ：在兼容的摄像机设备上记录场景深度信息的捕获输出。

 AVCaptureMetadataOutput ：用于处理捕获会话AVCaptureSession产生的定时元数据的捕获输出。

 AVCaptureStillImageOutput ：在macOS中捕捉静止照片的捕获输出。该类在iOS 10.0中被弃用，并且不支持新的相机捕获功能，例如原始图像输出和实时照片。在iOS 10.0或更高版本中，使用AVCapturePhotoOutput类代替

 AVCapturePhotoOutput ：静态照片、动态照片和其他摄影工作流的捕获输出

 AVCaptureVideoDataOutput ：记录视频并提供对视频帧进行处理的捕获输出。

 AVCaptureFileOutput ：用于捕获输出的抽象超类，可将捕获数据记录到文件中。

 AVCaptureMovieFileOutput ：继承自AVCaptureFileOutput 将视频和音频记录到QuickTime电影文件的捕获输出

 AVCaptureAudioFileOutput ：继承自AVCaptureFileOutput，记录音频并将录制的音频保存到文件的捕获输出。

AVCaptureVideoDataOutputSampleBufferDelegate.CaptureOutput 未在 Swift 中调用

MyDalegate: AVCaptureVideoDataOutputSampleBufferDelegate,

videoOutput.setSampleBufferDelegate(MyDalegate(),queue:dispatchQueue.global(qos: .userInteractive) )

NSDictionary* attachments = (__bridge NSDictionary* _Nullable)CMCopyDictionaryOfAttachments(NULL,sampleBuffer,kCMAttachmentMode_ShouldPropagate);

NSDictionary* attachments = (__bridge_transfer NSDictionary* _Nullable)CMCopyDictionaryOfAttachments(NULL,kCMAttachmentMode_ShouldPropagate);