Re: [Gambas-user] reading files
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Re: [Gambas-user] reading files
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From: Gianluigi <bag...@gm...> - 2017-07-20 16:22:10
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Hi Tony, Sorry if i answered instead of you, but I did not understand who the question was for :-( Regards Gianluigi 2017-07-20 15:35 GMT+02:00 Tony Morehen <tmo...@aj...>: > It is my code. It started off life as part of a cd ripper program I wrote > in 2010 in vb6. It was inspired by code provided by Steve McMahon ( > st...@vb...) under an Apache style licence. The code has > since been heavily rewritten, translated to vb.net and finally translated > to gambas. > > > On 2017-07-20 07:16 AM, Shane wrote: > >> with the code i was trying to adapt you can't >> >> i was getting strange values eg. >> >> a struct size of 208 when it was meant to be 128 and for some strange >> reason get end of file >> >> when seeking to eof less header even if i backed up more than the 208 >> bytes >> >> i can see that tony didn't right it i should of said did he convert it to >> gambas ? >> >> i think this should be in the farm ? >> >> >> >> >> On 20/07/17 21:04, Gianluigi wrote: >> >>> 2017-07-20 12:09 GMT+02:00 Shane <bus...@gm...>: >>> >>> yep can't use structs have to do like tony's code works perfect thanks >>>> again tony >>>> >>>> mmmmh are you sure? >>> >>> >>> p.s is this your code ? >>>> >>>> No, but you can easily see who wrote it :) >>> >>> >>> >>>> >>>> On 20/07/17 19:56, Gianluigi wrote: >>>> >>>> Right ... and a look here too [0] >>>>> >>>>> Ciao :) >>>>> Gianluigi >>>>> >>>>> [0] http://www.gambas-it.org/smf/index.php?topic=5794.msg41793#m >>>>> sg41793 >>>>> >>>>> 2017-07-20 3:15 GMT+02:00 Shane <bus...@gm...>: >>>>> >>>>> thanks tony sounds like just what i needed i will take a look >>>>> >>>>>> cheers >>>>>> >>>>>> >>>>>> >>>>>> On 19/07/17 22:34, Tony Morehen wrote: >>>>>> >>>>>> I've attached an archive containing the code I use to read v1 and v2 >>>>>> MP3 >>>>>> >>>>>>> tags and other MP3 info including bitrates (fixed and VBR), sampling >>>>>>> rates >>>>>>> and number of channels. v1 tags are pretty staightforward to read if >>>>>>> you >>>>>>> don't try to read the structure directly, but by each element of the >>>>>>> structure at a time. Some tips: >>>>>>> >>>>>>> 1) Numeric elements (bytes, bytearrays, shorts, integers, longs) can >>>>>>> be >>>>>>> read directly from the stream. ie (4 byte Integer) = Read #Stream As >>>>>>> Integer. Gambas can handle little endian/big endian issues. >>>>>>> >>>>>>> 2) Fixed length strings must be handled in a two stage process. >>>>>>> First, >>>>>>> the required string length number of bytes is read into a byte array. >>>>>>> This >>>>>>> byte array is then converted to a string. Sample code: >>>>>>> >>>>>>> Dim Bytes As New Byte[StringLength] >>>>>>> Bytes.Read(Stream) >>>>>>> FixedString = Bytes.ToString() >>>>>>> >>>>>>> Note: Bytes.ToString stops the string conversion at the first null >>>>>>> or at >>>>>>> the end of the array. Therfore, you don't have to worry about >>>>>>> null-terminated strings. >>>>>>> >>>>>>> v2 tags are more complicated, particularly since the tags can be >>>>>>> ascii, >>>>>>> either kind of utf16, or utf8 encoding. The code I sent has been >>>>>>> tested >>>>>>> with over 10,000 mp3 files has seems to have no issues. >>>>>>> >>>>>>> >>>>>>> On 2017-07-19 12:33 AM, Shane wrote: >>>>>>> >>>>>>> thank you Gian i did take a rest and read but alas it did not help >>>>>>> >>>>>>>> as far as i see it he is saying don't use binary file for fixed >>>>>>>> length >>>>>>>> strings >>>>>>>> >>>>>>>> but as this is an mp3 file tag witch i have no control i am doomed >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On 18/07/17 19:22, Gianluigi wrote: >>>>>>>> >>>>>>>> Why do not you take a moment of rest and read what Tobias Boege >>>>>>>> >>>>>>>>> recommend >>>>>>>>> me in the discussion [0] I told you here [1]? >>>>>>>>> >>>>>>>>> [0] >>>>>>>>> http://gambas.8142.n7.nabble.com/Random-access-files-with-fi >>>>>>>>> xed-length-string-td50880.html >>>>>>>>> [1] http://gambas.8142.n7.nabble.com/vb-code-td59764.html >>>>>>>>> >>>>>>>>> 2017-07-18 9:04 GMT+02:00 Shane <bus...@gm...>: >>>>>>>>> >>>>>>>>> I am very confused from the docs >>>>>>>>> >>>>>>>>> _Variable_ *= READ* [ *#* _Stream_ ] *AS* _Datatype_ >>>>>>>>>> >>>>>>>>>> _Variable_ *= READ* [ *#* _Stream_ *,* ] _Length_ >>>>>>>>>> >>>>>>>>>> so wouldn't it be_ >>>>>>>>>> _ >>>>>>>>>> >>>>>>>>>> IDtag = read #hfile as ID3v1_TAG ? >>>>>>>>>> >>>>>>>>>> with doesn't work by the way >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On 18/07/17 12:44, na...@no... wrote: >>>>>>>>>> >>>>>>>>>> I think >>>>>>>>>> >>>>>>>>>> Read #hfile, IDtag, ID3v1_TAG >>>>>>>>>>> should be >>>>>>>>>>> Read #hfile, IDtag as ID3v1_TAG >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> Open WebMail Project (http://openwebmail.org) >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> ---------- Original Message ----------- >>>>>>>>>>> From: Shane <bus...@gm...> >>>>>>>>>>> To: gam...@li... >>>>>>>>>>> Sent: Tue, 18 Jul 2017 10:50:43 +1000 >>>>>>>>>>> Subject: Re: [Gambas-user] reading files >>>>>>>>>>> >>>>>>>>>>> i don't know what i am doing wrong >>>>>>>>>>> >>>>>>>>>>> Public Struct ID3v1_TAG '(128 bytes) >>>>>>>>>>> >>>>>>>>>>>> Tag[3] As String 'always TAG >>>>>>>>>>>> Title[30] As String 'title, 30 characters >>>>>>>>>>>> Artist[30] As String 'artist, 30 characters >>>>>>>>>>>> Album[30] As String 'album, 30 characters >>>>>>>>>>>> Year[4] As String 'year, 4 characters >>>>>>>>>>>> Comment[30] As String 'comment, 30 characters (or >>>>>>>>>>>> 28 if >>>>>>>>>>>> track# included) >>>>>>>>>>>> Genre As Byte 'genre, 255 for none >>>>>>>>>>>> defined >>>>>>>>>>>> End Struct >>>>>>>>>>>> >>>>>>>>>>>> Private Sub GetID3v1(File As String) >>>>>>>>>>>> Dim IDtag As ID3v1_TAG >>>>>>>>>>>> Dim hfile As File >>>>>>>>>>>> >>>>>>>>>>>> hfile = Open File For Read >>>>>>>>>>>> >>>>>>>>>>>> ' >>>>>>>>>>>> 'read the tag >>>>>>>>>>>> ' seek to end of less tag size >>>>>>>>>>>> >>>>>>>>>>>> Read #hfile, IDtag, ID3v1_TAG >>>>>>>>>>>> >>>>>>>>>>>> here i get IDtag is NULL >>>>>>>>>>>> >>>>>>>>>>>> On 18/07/17 05:05, na...@no... wrote: >>>>>>>>>>>> >>>>>>>>>>>> Yes it is possible, I do it. here is some code (incomplete) >>>>>>>>>>>> >>>>>>>>>>>> -Nando (Canada) >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> ' top of class file >>>>>>>>>>>>> Public Struct recstruc >>>>>>>>>>>>> _a as integer >>>>>>>>>>>>> _b as integer >>>>>>>>>>>>> _c as integer >>>>>>>>>>>>> end struct >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> ' a function >>>>>>>>>>>>> public function openAfile(filename as string) as file >>>>>>>>>>>>> >>>>>>>>>>>>> dim hfile as file >>>>>>>>>>>>> dim arec as recstruc >>>>>>>>>>>>> >>>>>>>>>>>>> hfile = open filename for read write create >>>>>>>>>>>>> >>>>>>>>>>>>> with arec 'some values to write. >>>>>>>>>>>>> ._a = 1 >>>>>>>>>>>>> ._b = 22 >>>>>>>>>>>>> ._c = 333 >>>>>>>>>>>>> end with >>>>>>>>>>>>> >>>>>>>>>>>>> write #hfile, arec as recstruc >>>>>>>>>>>>> >>>>>>>>>>>>> 'if you position the hfile pointer back to zero, you can... >>>>>>>>>>>>> read #hfile, arec as recstruc >>>>>>>>>>>>> >>>>>>>>>>>>> close #hfile >>>>>>>>>>>>> >>>>>>>>>>>>> end >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> -- >>>>>>>>>>>>> Open WebMail Project (http://openwebmail.org) >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> ---------- Original Message ----------- >>>>>>>>>>>>> From: T Lee Davidson <t.l...@gm...> >>>>>>>>>>>>> To: gam...@li... >>>>>>>>>>>>> Sent: Sun, 16 Jul 2017 12:42:35 -0400 >>>>>>>>>>>>> Subject: Re: [Gambas-user] reading files >>>>>>>>>>>>> >>>>>>>>>>>>> On 07/16/2017 06:57 AM, Shane wrote: >>>>>>>>>>>>> >>>>>>>>>>>>> given this example >>>>>>>>>>>>> >>>>>>>>>>>>>> PRIVATE SUB BinaryRead(FilePath AS String) >>>>>>>>>>>>>>> DIM binaryFile AS File >>>>>>>>>>>>>>> DIM i AS Integer >>>>>>>>>>>>>>> DIM b AS Byte >>>>>>>>>>>>>>> DIM s AS Short >>>>>>>>>>>>>>> DIM s1 AS String >>>>>>>>>>>>>>> DIM s2 AS String >>>>>>>>>>>>>>> ' Read binary file >>>>>>>>>>>>>>> binaryFile = OPEN FilePath FOR READ >>>>>>>>>>>>>>> READ #binaryFile, i >>>>>>>>>>>>>>> READ #binaryFile, b >>>>>>>>>>>>>>> READ #binaryFile, s >>>>>>>>>>>>>>> READ #binaryFile, s1 >>>>>>>>>>>>>>> READ #binaryFile, s2 >>>>>>>>>>>>>>> CLOSE #binaryFile >>>>>>>>>>>>>>> ' Display results >>>>>>>>>>>>>>> PRINT i >>>>>>>>>>>>>>> PRINT b >>>>>>>>>>>>>>> PRINT s >>>>>>>>>>>>>>> PRINT s1 >>>>>>>>>>>>>>> PRINT s2 >>>>>>>>>>>>>>> END >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> is there a way for gambas to read a struct of all these >>>>>>>>>>>>>>> variables >>>>>>>>>>>>>>> in one read ? >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> You may have hinted at the solution within your question. >>>>>>>>>>>>>>> Have >>>>>>>>>>>>>>> you >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> considered >>>>>>>>>>>>>>> >>>>>>>>>>>>>> using a Structure? >>>>>>>>>>>>>> >>>>>>>>>>>>>> http://gambaswiki.org/wiki/lang/read : >>>>>>>>>>>>>> "... reads the stream Stream as binary data whose type is >>>>>>>>>>>>>> specified by >>>>>>>>>>>>>> the >>>>>>>>>>>>>> Datatype argument." >>>>>>>>>>>>>> >>>>>>>>>>>>>> "The returned datatype can be one of the following: NULL, >>>>>>>>>>>>>> Boolean, >>>>>>>>>>>>>> Byte, Short, >>>>>>>>>>>>>> Integer, Long, Pointer, Single, Float, Date, String, >>>>>>>>>>>>>> Variant, >>>>>>>>>>>>>> any >>>>>>>>>>>>>> Array, >>>>>>>>>>>>>> Collection or structure." >>>>>>>>>>>>>> >>>>>>>>>>>>>> http://gambaswiki.org/wiki/lang/structdecl >>>>>>>>>>>>>> >>>>>>>>>>>>>> -- >>>>>>>>>>>>>> Lee >>>>>>>>>>>>>> >>>>>>>>>>>>>> ------------------------------------------------------------ >>>>>>>>>>>>>> ------------------ >>>>>>>>>>>>>> Check out the vibrant tech community on one of the world's >>>>>>>>>>>>>> most >>>>>>>>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>>>>>>>>> _______________________________________________ >>>>>>>>>>>>>> Gambas-user mailing list >>>>>>>>>>>>>> Gam...@li... >>>>>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>>>>>>>>> >>>>>>>>>>>>>> ------- End of Original Message ------- >>>>>>>>>>>>>> >>>>>>>>>>>>>> ------------------------------------------------------------ >>>>>>>>>>>>> ------------------ >>>>>>>>>>>>> Check out the vibrant tech community on one of the world's most >>>>>>>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>>>>>>>> _______________________________________________ >>>>>>>>>>>>> Gambas-user mailing list >>>>>>>>>>>>> Gam...@li... >>>>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>>>>>>>> >>>>>>>>>>>>> ------------------------------------------------------------ >>>>>>>>>>>>> >>>>>>>>>>>>> ------------------ >>>>>>>>>>>> Check out the vibrant tech community on one of the world's most >>>>>>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>>>>>>> _______________________________________________ >>>>>>>>>>>> Gambas-user mailing list >>>>>>>>>>>> Gam...@li... >>>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>>>>>>> >>>>>>>>>>>> ------- End of Original Message ------- >>>>>>>>>>>> >>>>>>>>>>>> ------------------------------------------------------------ >>>>>>>>>>> ------------------ >>>>>>>>>>> Check out the vibrant tech community on one of the world's most >>>>>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>>>>>> _______________________________________________ >>>>>>>>>>> Gambas-user mailing list >>>>>>>>>>> Gam...@li... >>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>>>>>> >>>>>>>>>>> ------------------------------------------------------------ >>>>>>>>>>> >>>>>>>>>>> ------------------ >>>>>>>>>> Check out the vibrant tech community on one of the world's most >>>>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>>>>> _______________________________________________ >>>>>>>>>> Gambas-user mailing list >>>>>>>>>> Gam...@li... >>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>>>>> >>>>>>>>>> ------------------------------------------------------------ >>>>>>>>>> ------------------ >>>>>>>>>> >>>>>>>>>> Check out the vibrant tech community on one of the world's most >>>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>>>> _______________________________________________ >>>>>>>>> Gambas-user mailing list >>>>>>>>> Gam...@li... >>>>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>>>> >>>>>>>>> >>>>>>>>> ------------------------------------------------------------ >>>>>>>> ------------------ >>>>>>>> >>>>>>>> Check out the vibrant tech community on one of the world's most >>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>>> _______________________________________________ >>>>>>>> Gambas-user mailing list >>>>>>>> Gam...@li... >>>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>>> >>>>>>>> >>>>>>>> ------------------------------------------------------------ >>>>>>> ------------------ >>>>>>> Check out the vibrant tech community on one of the world's most >>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Gambas-user mailing list >>>>>>> Gam...@li... >>>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>>> >>>>>>> ------------------------------------------------------------ >>>>>>> >>>>>> ------------------ >>>>>> Check out the vibrant tech community on one of the world's most >>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>>> _______________________________________________ >>>>>> Gambas-user mailing list >>>>>> Gam...@li... >>>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>>> >>>>>> ------------------------------------------------------------ >>>>>> >>>>> ------------------ >>>>> Check out the vibrant tech community on one of the world's most >>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>>> _______________________________________________ >>>>> Gambas-user mailing list >>>>> Gam...@li... >>>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>>> >>>>> >>>> ------------------------------------------------------------ >>>> ------------------ >>>> Check out the vibrant tech community on one of the world's most >>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>> _______________________________________________ >>>> Gambas-user mailing list >>>> Gam...@li... >>>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>>> >>>> ------------------------------------------------------------------------------ >>> >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> _______________________________________________ >>> Gambas-user mailing list >>> Gam...@li... >>> https://lists.sourceforge.net/lists/listinfo/gambas-user >>> >> >> >> ------------------------------------------------------------------------------ >> >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Gambas-user mailing list >> Gam...@li... >> https://lists.sourceforge.net/lists/listinfo/gambas-user >> > > > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Gambas-user mailing list > Gam...@li... > https://lists.sourceforge.net/lists/listinfo/gambas-user > |