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Re: Import files on accessible URL and save in

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122783] Re: Import files on accessible URL and save in
  • From: Armand Tamzarian <mike.honeychurch at gmail.com>
  • Date: Thu, 10 Nov 2011 06:54:21 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201111050945.EAA10302@smc.vnet.net> <j9dold$b55$1@smc.vnet.net>

On Nov 9, 10:37 pm, Todd Gayley <tgay... at wolfram.com> wrote:
> At 04:24 PM 11/8/2011, DrMajorBob wrote:
>
> >This fails, and I wonder why?
>
> >DeleteDirectory["/private/var/folders/kY", DeleteContents -> True]
>
> >$Failed
>
> >DeleteDirectory::dirne: Directory /private/var/folders/kY not empty. >>
>
> I would guess it is because other processes have files open in that
> directory. Why are you trying to delete an entire directory (two
> levels up, no less), when FetchURL just created one file?
>
> As for your question about documentation, Utilities`URLTools`FetchURL
> is not an officially documented part of the system, which could be
> for a number of reasons. However, it has been a stable part of
> Mathematica for long enough (it is used internally by Import) that I
> am comfortable recommending it to users who need its functionality.
>
> Todd Gayley
> Wolfram Research
>
>
>
>
>
>
>
> >On Tue, 08 Nov 2011 16:08:46 -0600, DrMajorBob <btre... at austin.rr.com>
> >wrote:
>
> >><<Utilities`URLTools`
> >>FetchURL["http://www.wolfram.com";]
> >>"/private/var/folders/kY/kYL-hxebGaefEKwlddWc3++++TM/-Tmp-/Temp7483389857745393361___www.wolfram.com"
>
> >>Good job! Now, then... where is that file, and how do I remove it?
>
> >>Bobby
>
> >>On Tue, 08 Nov 2011 06:14:50 -0600, Todd Gayley <tgay... at wolfram.com>
> >>wrote:
>
> >>>At 03:45 AM 11/5/2011, Gy Peng wrote:
> >>>>Dear Mathematica friends,
>
> >>>>I want to Import some files stored on internet by:
>
> >>>>Import["http://url";, ...]
>
> >>>>This allow me to see the file in the notebook of mathematica. However,
> >>>>what
> >>>>I want to do is to download and save the files in local machine. And
> >>>>since
> >>>>I have may be hundreds or thousands files need to be download and
> >>>>save. Is
> >>>>there any why in Mathematica to do it in a most optimized and fast way?
>
> >>>>And can read the file names in a single string in Mathematica like:
>
> >>>>{ file1, file2, file3, file4, ...}
>
> >>>>How could I make a loop in Mathematica to download and save all of
> >>>>them in a same directory in local machine by Mathematica?
>
> >>>>I would thank you for all your kind reply and help!!!!
>
> >>>The FetchURL function, which is used internally by Import, will do
> >>>what you want:
>
> >>>     In[10]:= << Utilities`URLTools`
>
> >>>     In[11]:= FetchURL["http://www.wolfram.com";]
>
> >>>     Out[11]=
> >>>"C:\\Users\\tgayley\\AppData\\Local\\Temp\\Temp65400___www.wolfram.com"
>
> >>>If you want to choose a specific location and filename for the
> >>>downloaded file, you pass it as the second argument:
>
> >>>     In[12]:= FetchURL["http://www.wolfram.com";, "c:\\foo.txt"]
>
> >>>     Out[12]= "c:\\foo.txt"
>
> >>>If you want a program that downloads a list of URLs to a specific
> >>>directory, this will do the trick.
>
> >>>     listOfURLs = {"http://www.wolfram.com";, "http://www.apple.com";,
> >>>"http://www.microsoft.com"};
> >>>     downloadDir = "c:\\foo";  (* I assume it exists *)
> >>>     n = 1;
> >>>     {#, FetchURL[#, ToFileName[downloadDir, "file" <>
> >>>ToString[n++]]]} & /@ listOfURLs
>
> >>>This returns a list of {url, filename} pairs so you can match up each
> >>>URL with the corresponding file. You could also create filenames
> >>>based on the URL so that it was immediately obvious which file was
> >>>the product of which URL.
>
> >>>Todd Gayley
> >>>Wolfram Research
>
> >--
> >DrMajor... at yahoo.com

Todd,

While FetchURL may do this, surely things like wget and curl are the
best tools to employ? Apart from anything else you aren't tying up
your Mathematica session, you can get on with your stuff while wget does its
thing in the background. Additionally if the website has cookies or
you need to loggin you will need wget (...right? FetchURL would not
work in those cases would it?).


Mike



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