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Re: Import files on accessible URL and save in

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122765] Re: Import files on accessible URL and save in
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Thu, 10 Nov 2011 06:51:06 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201111050945.EAA10302@smc.vnet.net>
  • Reply-to: drmajorbob at yahoo.com

I'm using Mac, not Windows.

I can't see the file (or files) downloaded, can't delete them, and can't  
imagine why THAT would be the default location.

Bobby

On Wed, 09 Nov 2011 09:59:29 -0600, Patrick Scheibe  
<pscheibe at trm.uni-leipzig.de> wrote:

> Hi,
>
> I have written a small application which uses FetchURL to download and
> install a Mathematica-package of mine from within Mathematica and
> without external tools like wget, tar, ..
>
> There, I came across this behaviour too. On windows, and only on
> windows, I was not able to remove my temporary "package installer"
> although I closed every used file.
>
> When I remeber right, I could remove it *after* killing the kernel which
> is a bit useless if you want to download, install and remove temp. stuff
> in one function call and leave the user with a fresh installed new
> package.
>
> Cheers
> Patrick
>
> On Wed, 2011-11-09 at 06:24 -0500, Todd Gayley 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 <btreat1 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 <tgayley 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
>> >>>
>> >>
>> >
>> >
>> >--
>> >DrMajorBob at yahoo.com
>>
>>
>
>


-- 
DrMajorBob at yahoo.com



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