Question

我想使用ExifLib从Photo中读取exif信息，第一种方法已经完成，因为我使用了PhotoChooserTask和photoChooserTask.Completed += (s, e) => {PhotoConverter.GetMetaData(e);} 以及获取exif信息的方法

public static void GetMetaDate(PhotoResult e)
{     
    ExifLib.JpegInfo info = ExifLib.ExifReader.ReadJpeg(e.ChosenPhoto);
    var img = new BitmapImage();
    img.SetSource(e.ChosenPhoto);
    App.MainViewModel.MetaDate = ReadExif(info);
}

private static string ReadExif(JpegInfo info)
{
    JsonObject metaDate = new JsonObject();
    metaDate.Add("FNumber", info.FNumber);
    return metaDate.ToString();
}

这很棒，但问题是当我想从手机画廊分享图片时。我获取图片的方式看起来像这样

if (queryStrings.ContainsKey("FileId"))
{
     MediaLibrary library = new MediaLibrary();
     Picture photoFromLibrary = library.GetPictureFromToken(queryStrings["FileId"]);
     BitmapImage bitmapFromPhoto = new BitmapImage();
     bitmapFromPhoto.SetSource(photoFromLibrary.GetImage());
}

那么，我应该如何更改我的GetMetaDate来阅读photoFromLibrary.GetImage

Answer 1

好的，我找到了简单的方法

public static void GetMetaData(Stream photo)//change to stream
{
    ExifLib.JpegInfo info = ExifLib.ExifReader.ReadJpeg(photo);
    var img = new BitmapImage();
    img.SetSource(photo);
    App.MainViewModel.MetaDate = ReadExif(info);
}

并使用MediaLibrary添加流

if (queryStrings.ContainsKey("FileId"))
{
     // Retrieve the photo from the media library using the FileID passed to the app.
     MediaLibrary library = new MediaLibrary();
     Picture photoFromLibrary = library.GetPictureFromToken(queryStrings["FileId"]);

     //Get metadate
     Stream stream = photoFromLibrary.GetImage();
     PhotoConverter.GetMetaData(stream);
}

从照片中获取Exif信息

1 个答案: