Stringをどうにかする / Managing Solidity String

2019-11-29 blockchain.tokyo#23 Dapp開発Special
https://blockchain-tokyo.connpass.com/event/154664/

Transcript

1. 4USJOHΛͲ͏ʹ͔͢Δ
   CMPDLDIBJOUPLZP
   EPVCMFKVNQUPLZPגࣜձࣾ
   ϦʔυΤϯδχΞຬ଍྄
   

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2. w 3FCVJMEJOHUIFGVUVSFPGHBNJOH

   XJUICMPDLDIBJOUFDIOPMPHZ
   w ೥݄૑ۀ
   w ϒϩοΫνΣʔϯήʔϜઐۀ։ൃձࣾ
   w ैۀһਓʢۀ຿ҕୗΛؚΉʣ
   w ϒϩοΫνΣʔϯʹ೤ҙͷ͋ΔΤϯδχΞΛੵۃ࠾༻தͰ͢ʂ
   EPVCMFKVNQUPLZPגࣜձࣾ
   

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3. w ຬ଍྄ʢ.BO[PLV3ZPʣ
   w EPVCMFKVNQUPLZPϦʔυΤϯδχΞ
   w ೥݄ΑΓΠϯϑϥઃܭӡ༻ɺαʔόαΠυ։ൃɺ
   4NBSU$POUSBDU։ൃɺϒϩοΫνΣʔϯٕज़ௐࠪͳͲΛ୲౰
   w աڈʹ͸ιʔγϟϧήʔϜձࣾɺ&E5FDIΞϓϦձࣾͰΠϯϑ
   ϥΤϯδχΞͱͯ͠"84Λத৺ͱͨ͠Ϋϥ΢υΠϯϑϥ͔ΒΞ
   ϓϦ·ͰͷશମઃܭɺߏஙɺվળΛܦݧ
   ࣗݾ঺հ
   

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4. 4PMJEJUZॻ͍ͯ·͔͢ʁ
   

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5. 4USJOHܕ࢖͍·͔͢ʁ
   

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7. )FMMP8PSMEҎ֎Ͱ࢖͏͜ͱ͋Δͷʁ
   

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8. &3$.FUBEBUB
   

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9. &3$63*
   

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10. &UISFVN͔Β֎ͷੈքΛࢀর͢Δ
    ৔߹ʹ࢖͏
    

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11. 4PMJEJUZEPFTOPUIBWFTUSJOHNBOJQVMBUJPOGVODUJPOT
    CVUUIFSFBSFUIJSEQBSUZTUSJOHMJCSBSJFT
    https://solidity.readthedocs.io/en/v0.5.13/types.html#bytes-and-strings-as-arrays
    

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12. Ͳ͏ʹ͔͍͖ͯ͠·͠ΐ͏
    

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13. w MFO TUS
    
    w TUSMFOHUI
    w CZUFT TUS
    MFOHUI
    2จࣈྻͷ௕͞
    

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14. w MFO TUS
    
    w 4PMJEJUZʹ૊ΈࠐΈͷMFO
    ͸ଘࡏ͠ͳ͍
    w TUSMFOHUI
    w .FNCFSMFOHUIOPUGPVOEPSOPUWJTJCMFBGUFS
    BSHVNFOUEFQFOEFOUMPPLVQJOMJUFSBM@TUSJOH
    w CZUFT TUS
    MFOHUI
    w ˓
    "จࣈྻͷ௕͞
    

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15. TUSJOHJTFRVBMUPCZUFTCVUEPFT
    OPUBMMPXMFOHUIPSJOEFYBDDFTT
    https://solidity.readthedocs.io/en/v0.5.13/
    types.html#bytes-and-strings-as-arrays
    

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16. w TUSTUS
    
    w LFDDBL TUS
    LFDDBL TUS
    
    w LFDDBL BCJFODPEF1BDLFE T
    
    LFDDBL BCJFOD
    PEF1BDLFE T
    
    
    2จࣈྻͷൺֱ
    

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17. w TUSTUS
    
    w ඇਪ঑
    w LFDDBL TUS
    LFDDBL TUS
    
    w ͪΐͬͱલ·Ͱ͜Ε͕ਪ঑͞Ε͍ͯͨ
    w LFDDBL BCJFODPEF1BDLFE T
    
    LFDDBL BCJFOD
    PEF1BDLFE T
    
    
    w ˓W͔ΒυΩϡϝϯτʹొ৔
    "จࣈྻͷൺֱ
    

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18. w TUSTUS
    w CZUFT TUS
    CZUFT TUS
    
    w BCJFODPEF1BDLFE TUS TUS
    
    w Ͳ͏ʹ͔͢Δ
    2จࣈྻͷ࿈݁
    

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19. w TUSTUS
    w TUSJOH͸"SSBZͳͷͰ͸࢖͑·ͤΜ
    w CZUFT TUS
    CZUFT TUS
    
    w CZUFT͸"SSBZͳͷͰ͸࢖͑·ͤΜ
    w BCJFODPEF1BDLFE TUS TUS
    
    w ˓W͔ΒυΩϡϝϯτʹొ৔
    w Ͳ͏ʹ͔͢Δ
    "จࣈྻͷ࿈݁
    

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20. BCJFODPEF1BDLFEΛ஌Βͳ͔ͬͨࠒ
    

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21. w TUS>
    w CZUFT>
    w Ͳ͏ʹ͔͢Δ
    2จࣈྻͷ੾ΓऔΓ
    

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22. w TUS>
    w TUSJOHJTFRVBMUPCZUFTCVUEPFTOPUBMMPXMFOHUIPS
    JOEFYBDDFTT
    w CZUFT>
    w Έ͍ͨͳΞΫηε͸Ͱ͖ͳ͍ɻจࣈ͚ͩͳΒ͜ΕͰ΋Մ
    w Ͳ͏ʹ͔͢Δ
    w ˓
    "จࣈྻͷ੾ΓऔΓ
    

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23. Ͳ͏ʹ͔͢Δ
    

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24. w TUSJOH J
    
    w TUSJOH BCJFODPEF1BDLFE J
    
    
    w Ͳ͏ʹ͔͢Δ
    2VJOUͷจࣈྻԽ
    

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25. w TUSJOH J
    
    w ͦΜͳ؁͘ͳ͍
    w TUSJOH BCJFODPEF1BDLFE J
    
    
    w Ͱ͖Δ͔ͳͱࢥ͚ͬͨͲͦΜͳ؁͘ͳ͍
    w Ͳ͏ʹ͔͢Δ
    w ˓
    "VJOUͷจࣈྻԽ
    

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26. Ͳ͏ʹ͔͢Δ
    

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27. w BEESTUSJOH
    
    w TUSJOH BEES
    
    w TUSJOH BCJFODPEF1BDLFE BEES
    
    
    w Ͳ͏ʹ͔͢Δ
    2BEESFTTͷจࣈྻԽ
    

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28. w BEESTUSJOH
    
    w ͦΜͳ؁͘ͳ͍
    w TUSJOH BEES
    
    w &YQMJDJUUZQFDPOWFSTJPOOPUBMMPXFE
    w TUSJOH BCJFODPEF1BDLFE BEES
    
    
    w &YQMJDJUUZQFDPOWFSTJPOOPUBMMPXFE
    w Ͳ͏ʹ͔͢Δˠ˓
    "BEESFTTͷจࣈྻԽ
    

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29. Ͳ͏ʹ͔͢Δ
    

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30. w Ͳ͏ʹ͔͢Δ
    2จࣈྻͷ4QMJU
    

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32. ΄Μͱʹ͜ΕΛ΍Δͷʁ
    

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33. 4PMJEJUZEPFTOPUIBWFTUSJOHNBOJQVMBUJPOGVODUJPOT
    CVUUIFSFBSFUIJSEQBSUZTUSJOHMJCSBSJFT
    

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34. 044Ͱެ։ͯ͠·͢ʂ
    IUUQTHJUIVCDPN
    EPVCMFKVNQUPLZPNDIQMVTDPOUSBDUT
    

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35. ϚΠΫϦΛ࢝ΊΑ͏ʂ
    https://mch.gg/start
    ট଴ίʔυ͸
    ʮTHA4ʯ

    Λೖྗʂ
    

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