從資料庫中的blob欄位中取得的數據，是data，

{7920b7e8 1743de9c afdd9cd9 90ccf3d3 79d916ec 69d80278 72fd3495 cdb4e19c 0f813a57 dded5db4 f19074e19c 0f813a57 dded5db4 f19074e19c 0f813a57 d e571111 6f02f840 1935403a 13369916 c470692f cfea04c6 eb269dba 5a647911 cdfc9553 9da0942d 6bdbe4e2 e46 2ab 80b65839 c180d964 5b0c3d28 e0684c4e 11e92f37 5f9ed5b9 a829cd60 ea19323f bafadd50 e61488e7 f8a76919323f bafadd50 e61488e7 f8a76919323f bafadd50 e61488e7 f8a7691462196950219295602192956021929560219295021929502135 f795de49 3b8c3b04 9dd4b96c 4453ad73 8f6988fa 6ac0f5c0 23c4855b 1414305d bfc28999 a584f5e1 7f30769 5d bfc28999 a584f5e1 7f30769 16851250120102 b 0406a581 732d7894 ecd032dc 19518a90 ecd58d16 d8b5df98 2d007730 ee4c3c37 1adb1e1b fd4b8002 0a0194757 d53fb4f5 5ea0853e 0ff2794b 919d0a9f 9708dd44 e824de1c 07fbe90d a3708ea4 00fb7de5 8e43771a ba5c1c28 d967bfb7de5 8e43771a ba5c1c28 d967bfb7de5 8e43771a ba5c1c28 d967bfb 0799 7113bda5 4a567dfa 6e059fc0 1d245d9a 6428bbfe d9b18052 ff93d1f7 c4ab8c45 6c8e066f c96f6ee4 b0291d5a 7a3d7cbc b009b399 160ca577 a0fce3d7cbc b009b399 160ca577 a0fce016 387000625b 86a2e a08bf8d4 9ba25b3e ee28fdc7 35333a9d 447b35d7 0774777a 1aa26d21 c36d64ef ea42569f 64c9926d21 c36d64ef ea42569f 64c9961 5625938

我用 NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];結果是空的，我不知道是怎麼回事，請求幫助。