使用带有MediaCapture的CaptureElement自定义分辨率拍照

我正在使用CaptureElement在我的Windowsapp store中显示相机源。 现在,当用户点击显示器时,我想将照片捕获为流,我使用下面的代码工作。 不幸的是,返回的图像只有640 x 360的分辨率,但相机(Surface RT)可以拍摄1280×800的图像,我想这样做。

我尝试过设置

encodingProperties.Height = 800; encodingProperties.Width = 1280; 

但那没用。 那么我该如何改变分辨率呢?

  private async void captureElement_Tapped(object sender, TappedRoutedEventArgs e) { var encodingProperties = ImageEncodingProperties.CreateJpeg(); //encodingProperties.Height = 800; //encodingProperties.Width = 1280; WriteableBitmap wbmp; using (var imageStream = new InMemoryRandomAccessStream()) { await captureMgr.CapturePhotoToStreamAsync(encodingProperties, imageStream); await imageStream.FlushAsync(); imageStream.Seek(0); wbmp = await new WriteableBitmap(1, 1).FromStream(imageStream); } capturedImage.Source = wbmp; } 

所以我终于想出了如何通过这个来摆脱可怕的“HRESULT:0xC00D36B4”错误,部分归功于这里的代码: http ://social.msdn.microsoft.com/Forums/en-US/ winappswithcsharp /线程/ 751b8d83-e646-4ce9-B019-f3c8599e18e0

我做了一些调整,这就是我在这里重新发布代码的原因

  MediaCapture mediaCapture; DeviceInformationCollection devices; protected override void OnNavigatedTo(NavigationEventArgs e) { devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture); this.mediaCapture = new MediaCapture(); if (devices.Count() > 0) { await this.mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings { VideoDeviceId = devices.ElementAt(1).Id, PhotoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.VideoPreview }); SetResolution(); } } //This is how you can set your resolution public async void SetResolution() { System.Collections.Generic.IReadOnlyList res; res = this.mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview); uint maxResolution = 0; int indexMaxResolution = 0; if (res.Count >= 1) { for (int i = 0; i < res.Count; i++) { VideoEncodingProperties vp = (VideoEncodingProperties)res[i]; if (vp.Width > maxResolution) { indexMaxResolution = i; maxResolution = vp.Width; Debug.WriteLine("Resolution: " + vp.Width); } } await this.mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, res[indexMaxResolution]); } } 

虽然拍照,但请确保您始终使用.VideoPreview,而不是.Photo!