Question

我试图用我的Lumia 930 Windows Phone拍摄照片2天。

我使用以下代码：

public sealed partial class MainPage : Page
{
    Windows.Media.Capture.MediaCapture captureManager;

    public MainPage()
    {
        this.InitializeComponent();
        First.Click += async (sender, e) => await Initialize();
        Second.Click += async (sender, e) => await shutter();
    }

    private async Task Initialize()
    {
        captureManager = new MediaCapture();

        var devices = await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(Windows.Devices.Enumeration.DeviceClass.VideoCapture);

        List<Windows.Devices.Enumeration.DeviceInformation> _deviceList = new List<Windows.Devices.Enumeration.DeviceInformation>();
        for (var i = 0; i < devices.Count; i++)
        {
            _deviceList.Add(devices[i]);
        }

        MediaCaptureInitializationSettings _captureInitSettings = null;
        _captureInitSettings = new Windows.Media.Capture.MediaCaptureInitializationSettings();
        _captureInitSettings.AudioDeviceId = "";
        _captureInitSettings.VideoDeviceId = "";
        _captureInitSettings.StreamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.AudioAndVideo;
        _captureInitSettings.PhotoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.Photo;

        if (_deviceList.Count > 0)
            _captureInitSettings.VideoDeviceId = _deviceList[0].Id;

        await captureManager.InitializeAsync(_captureInitSettings);
        //capturePreview.Source = captureManager;
        //await captureManager.StartPreviewAsync();
        await SetResolution();
    }

    public async Task SetResolution()
    {
        System.Collections.Generic.IReadOnlyList<IMediaEncodingProperties> res;
        res = this.captureManager.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.Photo);
        uint maxResolution = 0;
        int indexMaxResolution = 0;
        string s = "";

        if (res.Count >= 1)
        {
            for (int i = 0; i < res.Count; i++)
            {
                VideoEncodingProperties vp = (VideoEncodingProperties)res[i];
                var frameRate = (vp.FrameRate.Numerator / vp.FrameRate.Denominator);


                s = i + ") " + vp.Subtype + ", ";
                s = s + vp.Width;
                s = s + " x " + vp.Height;
                s = s + " , Frame/s: " + frameRate;

                if (vp.Width > maxResolution && vp.Subtype.Equals("YUY2"))
                {
                    indexMaxResolution = i;
                    maxResolution = vp.Width;

                }
                if (true)
                {
                    Debug.WriteLine(s);
                }
                s = "";
            }

            //setting resolution
            await captureManager.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.Photo, res[indexMaxResolution]);

            return;

        }
    }

    private async Task shutter()
    {
        ImageEncodingProperties imageProperties = ImageEncodingProperties.CreateJpeg();
        var photoStorageFile = await Windows.Storage.KnownFolders.PicturesLibrary.CreateFileAsync("Photo.JPG", Windows.Storage.CreationCollisionOption.GenerateUniqueName);
        await captureManager.CapturePhotoToStorageFileAsync(imageProperties, photoStorageFile);

        return;
    }

}

您可以在此处找到解决方案：

http://1drv.ms/1nFWoCF

当我选择
时 _captureInitSettings.PhotoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.VideoPreview;

我得到了一张照片，但其分辨率/质量非常糟糕。当使用Photo时，更有意义的是，我得到一个2MB的文件，这听起来很正确，但内容只有黑色和黄色线，就像镜头关闭一样。

相机肯定在使用诺基亚相机或其他应用程序，因此它不会成为硬件问题。

Answer 1

我认为您没有为您的任务选择合适的API。

您应该使用CameraCaptureTask（如果您想要保存在库中的标准相机UI +图像）或PhotoCamera（如果您想要自己的相机UI和/或者您不希望将照片保存在用户的库中。

不要忘记清单中的ID_CAP_ISV_CAMERA功能。

Answer 2

我现在设法通过首先开始预览拍摄照片。没有预览似乎无法工作：/

Windows Phone 8.1 Photo Capture不起作用

2 个答案: