Question

目前，我正在使用以下代码捕获照片并获取元数据：

using (var imageStream = new InMemoryRandomAccessStream())
{
   await _capture.CapturePhotoToStreamAsync(ImageEncodingProperties.CreateJpeg(), imageStream);
   var folder = await StorageFolder.GetFolderFromPathAsync(MediaBuilderSettings.GetScratchDirectory());
   var storageFile = await folder.CreateFileAsync(System.Guid.NewGuid().ToString() + ".jpg", CreationCollisionOption.ReplaceExisting);
   var storageFileStream = await storageFile.OpenAsync(FileAccessMode.ReadWrite);
   await RandomAccessStream.CopyAndCloseAsync(imageStream, storageFileStream);
   List<string> imageMetaRetrieveList = new List<string> { "System.Photo.Aperture", "System.Photo.Brightness" };
   IDictionary<string, object> extraProperties = await storageFile.Properties.RetrievePropertiesAsync(imageMetaRetrieveList);
}

有没有办法在不将图像保存到磁盘的情况下访问exif数据？

Answer 1

您可以使用ExifLib执行此操作。它支持从内存流中读取标记，如下所示。它适用于我的Win8.1 StoreApp项目。 UWP也可以。或许。

ExifLib - nuget

using ExifLib;
...
using (System.IO.MemoryStream stream = new System.IO.MemoryStream(buffer))
{
    using (var reader = new ExifReader(stream))
    {
        object value = null;
        string exifstr = "";
        // ISO
        reader.GetTagValue<object>(ExifTags.ISOSpeedRatings, out value);
        if (null != value && typeof(UInt16) == value.GetType())
        {
            exifstr += ("ISO" + value.ToString());
        }
        ....

从UWP Capture检索Exif数据而不保存到磁盘

1 个答案: