OpenEuphoria

1. How to download a binary file via http? [Solved]

• Posted by sallecta Feb 12, 2011
• 1389 views

Hi,

I'm new to programming, and I chose Euphoria to start. There is good example of downloading text file in Euphoria 4 demos folder, but I stuck in getting the binary file.

Here is the changes I've made with wget demo

added new function to write a file in binary mode (actually ripped it from Wavelib 1.0 by Daryl Van Den Brink)

sequence localfile 
localfile = "localfile.txt" 
 
function write__file(sequence outputfile, sequence filedata) 
    integer fn 
     
    fn = open(outputfile, "wb") 
    if fn = -1 then 
        return -1 
    end if 
    printf(fn, "%s\n", { filedata[2] }) 
     
    close(fn) 
    return 0 
end function -- write_file 

changed the output in main procedure

--printf(1, "%s\n", { data[2] }) 
write__file(localfile, data) 

This works fine with text files but no result with binary. Help me to move from this, please. Any advise or links to documentation will be highly appreciated.

---

complete code (modified wget demo) to download a binary file via http. Thanks to Mihail121 for pointing me to write_file function.

include std/console.e 
include std/net/http.e 
include std/io.e 
 
sequence localfile 
localfile = "downloaded" 
 
without warning 
 
override procedure abort(integer x) 
	maybe_any_key() 
	eu:abort(x) 
end procedure 
 
procedure main(sequence args = command_line()) 
	if length(args) = 2 then 
		ifdef WIN32_GUI then 
		    puts(1, "This program must be run from the command-line:\n\n") 
		end ifdef 
		puts(1, "Usage: eui wget.ex URL\n") 
		abort(1) 
	end if 
	 
 
	sequence url = args[3] 
	object data = http_get(url) 
 
	if atom(data) or length(data) = 0 then 
		printf(1, "Could not download %s\n", { url }) 
		abort(2) 
	end if 
 
	write_file(localfile, data[2], BINARY_MODE) 
 
end procedure 
 
main() 
 

3. Re: How to download a binary file via http?

• Posted by sallecta Feb 12, 2011
• 1404 views

--printf(1, "%s\n", { data[2] }) 
--write__file(localfile, data) 
write_file(localfile, data[2], BINARY_MODE) 

Thank you very much for fast response! I've tested the write_file and successfully downloaded and opened the goggle logo and the crc.zip files

printf is successfully used in wavelib which deals with binary data... I have to read something more to understand why in some cases printf works fine, and with other - don't works)). I've also expected some points to initialize "binary" http transfer mode or base64 encode/decode, but your answer is so simple and it works well. If you have a bit of time, could you briefly explain why it works? Sorry, maybe I'me asking too much...

Thank you once again!

5. Re: How to download a binary file via http?

• Posted by sallecta Feb 12, 2011
• 1335 views

Thanks, Shawn. Now is all clear for me.

7. Re: How to download a binary file via http?

• Posted by sallecta Feb 12, 2011
• 1278 views

Sorry for printf I stupidly said that is used in wavelib... of course there are puts...