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我使用plupload將照片上傳到Blobstore。該BlobInfo object有一些元數據檢索保存到Blobstore的照片的元數據
content_type: The content type of the blob.
creation: The creation date of the blob, or when it was uploaded.
filename: The file name that the user selected from their machine.
size: The size of the uncompressed blob.
md5_hash: The MD5 hash value of the uploaded blob.
我的問題是怎樣才能得到照片的其他元數據無論是從plupload或服務器端?具體來說,我需要檢索一個「description」元數據字段。