Wow! This thread has yielded a wealth of information about hashes & checksums and the issues surrounding generating and using them. David Adams’s Hash Tool Component PDF finally gave me a good explanation about what a Hash is and provides a good resource. I’m still a little bit foggy about the difference between what a Hash is vs. what a Checksum is. Are they really different? Since the 4D Language itself doesn’t use the concept of hashes (I know they are used in other programming languages extensively), I simply don’t know much about them.
I downloaded Keisuke’s Hash plugin and will be testing it for use in my app during the next few days to generate MD5 checksums on files. David Belote Colorado Springs On 10/20/16, 8:25 PM, "4D_Tech on behalf of Keisuke Miyako" <[email protected] on behalf of [email protected]> wrote: it never occurred to me that PHP hashing could take so long... here I've just posted a plugin to generate the hash of a file: https://github.com/miyako/4d-plugin-hash for what it's worth, you can pass a callback method too... > 2016/10/20 23:17、Cannon Smith <[email protected]> のメール： > > I created a feature request a few years ago (http://forums.4d.fr/Post/EN/13706008/1/13706009#13706009) because I was in the same situation you are and turned to php as well. Only I was doing a SHA1 instead of MD5. Anyway, the thing I was running into wasn’t a file size limit but a time limit. PHP calls error out after 30 seconds which wasn’t enough time to compute the SHA1 on the size of files I was working with. > > I just mention it in case this is what is happening to you as well. 宮古 啓介 セールス・エンジニア 株式会社フォーディー・ジャパン 〒150-0043 東京都渋谷区道玄坂1-10-2 渋谷THビル6F Tel: 03-6427-8441 Fax: 03-6427-8449 [email protected] www.4D.com/JP ********************************************************************** 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4d.com/archives.html Options: http://lists.4d.com/mailman/options/4d_tech Unsub: mailto:[email protected] ********************************************************************** ********************************************************************** 4D Internet Users Group (4D iNUG) FAQ: http://lists.4d.com/faqnug.html Archive: http://lists.4d.com/archives.html Options: http://lists.4d.com/mailman/options/4d_tech Unsub: mailto:[email protected] **********************************************************************
