LuaSocket image

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LuaSocket image

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asafp
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Post: #1

LuaSocket image

I'm using luasocket HTTP to download an image (.jpg). It downloads without any error, but when I view it, it's all garbled.

I realize this is a bit off topic, but would appreciate any suggestions.

This post was last modified: 07-25-2008 09:58 AM by asafp.

07-25-2008 09:52 AM

znarf
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Post: #2

RE: LuaSocket image

One thing that immediately comes to my mind is byte order issues. One would expect luasocket to handle them, nevertheless it might be worthwhile to check if they are correctly done for your platform (which one?) internally.
Good luck.

07-25-2008 08:39 PM

asafp
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Post: #3

RE: LuaSocket image

This is from a Windows ASP server to a Windows XP x86 machine.

Downloads fine with curl. I was thinking it was something in the request header. Tried a few different things. Always same result. Thinking it might be transferring data as ascii instead of binary. I've had those kinds of problems with FTP. It's simple to change the transfer mode using FTP. I don't know how you would control that with HTTP.

07-26-2008 12:07 AM

JohnMurga
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Post: #4

RE: LuaSocket image

asafp Wrote:

Can you post the code so I can try it ?

Cheers
JohnM

07-26-2008 05:49 AM

asafp
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Post: #5

RE: LuaSocket image

Code:

function GetFile(urlin,headin,redirin,fid)

local http=require('socket.http')

local url=require('socket.url')

local ltn12 = require("ltn12")

local mime = require("mime")

local urlname=urlin

local headers={}

local redir=true

if redirin==false then

    redir=false

end

if headin==nil then 

    headers = {["Useragent"]='Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11',

--             ["Content-Type"] =  "application/x-www-form-urlencoded",

--             ["Timeout"] = "1",

            ["Accept-Encoding"]="gzip,deflate",

             ["Connection"]="Keep-Alive"}

else

    headers=headin

end

local t={}

local r, c, h, w = http.request {

  method = "GET",

  headers=headers,

  url = urlname,

  redirect = redir,

--  sink = ltn12.sink.table(t)

  sink = ltn12.sink.file(fid)

}

return c, h

end

imgin='Lg638183-01.jpg'

imgurl='http://www.compucars.co.uk/carpics/'..imgin

filename='img_compucars/'..imgin

fh=io.open(filename,'w')

c=nil

status=nil

c, heads=GetFile(imgurl, nil, nil, fh)

print (c)

Here you go.

07-26-2008 12:54 PM

asafp
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Post: #6

RE: LuaSocket image

have to put a "b" after the "w" for binary mode on file open.

fh=io.open(filename,'wb')

07-31-2008 07:01 AM

JohnMurga
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Post: #7

RE: LuaSocket image

asafp Wrote:

have to put a "b" after the "w" for binary mode on file open.

fh=io.open(filename,'wb')

I didn't get time to get home to have a play with code ... It didn't occur to me to have a look at that, but now you mention it I guess it would make a difference.

Did it fix your problem completely ?

Cheers
JohnM

07-31-2008 08:52 PM

asafp
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Post: #8

RE: LuaSocket image

Yes, it works great now. I knew it had to be something simple.

08-01-2008 02:31 AM

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