[R-SIG-Mac] Download data from Internet contained in a Zip file

[Christofer Bogaso]

Hi David et al,

Thanks for showing the pointers. With your approach, I see the
"temp.zip" file in my working folder.

However still I could not extract the data within it. I tried using
unzip() function, however not really going through :

> unzip("temp.zip")
Warning message:
In unzip("temp.zip") : error 1 in extracting from zip file

When I try to access the link
"https://npscra.nsdl.co.in/download.php?path=download/&filename=NAV_File_23122016.zip"
manually, then download the zip file and then unzip it, I get a file
called "NAV_File_23122016.out". Which next I open in excel and get all
the data.

I was just trying to perform similar task, however through R, so that
I can load data automatically directly from Web.

Any Idea please. I am using below version of R (I know this is quite
old version, however I am not currently in a position to upgrade my
Macbook)

> R.Version()
$platform
[1] "x86_64-apple-darwin10.8.0"

$arch
[1] "x86_64"

$os
[1] "darwin10.8.0"

$system
[1] "x86_64, darwin10.8.0"

$status
[1] ""

$major
[1] "3"

$minor
[1] "2.1"

$year
[1] "2015"

$month
[1] "06"

$day
[1] "18"

$`svn rev`
[1] "68531"

$language
[1] "R"

$version.string
[1] "R version 3.2.1 (2015-06-18)"

$nickname
[1] "World-Famous Astronaut"

On Mon, Dec 26, 2016 at 7:18 AM, David Winsemius <dwinsemius at comcast.net> wrote:
>
>> On Dec 25, 2016, at 3:46 PM, Gábor Csárdi <csardi.gabor at gmail.com> wrote:
>>
>> Your R build does not support HTTPS.
>>
>> I suggest that you use the curl package if you can. HTTP support in
>> base R is very limited currently.
>
> I generally use the downloader package. It sets up the call to download.file so that it succeeds with https URLs.
>
>
>  install.packages("downloader", dependencies=TRUE)
> trying URL 'http://cran.cnr.Berkeley.edu/bin/macosx/mavericks/contrib/3.3/downloader_0.4.tgz'
> Content type 'application/x-gzip' length 19459 bytes (19 KB)
> ==================================================
> downloaded 19 KB
>
>
> The downloaded binary packages are in
>         /var/folders/68/vh2f8kzn09j8954r6q9100yh0000gn/T//Rtmpq8DVG4/downloaded_packages
>> library(downloader)
>> help(pac=downloader)
> starting httpd help server ... done
>> download("https://npscra.nsdl.co.in/download.php?path=download/&filename=NAV_File_23122016.zip","temp.zip")
>
> # Requires both a source and destination file name.
>
> trying URL 'https://npscra.nsdl.co.in/download.php?path=download/&filename=NAV_File_23122016.zip'
> Content type 'application/octet-stream' length 1228 bytes
> ==================================================
> downloaded 1228 bytes
>
> --
> David.
>>
>> Gabor
>>
>>
>>
>> On Sun, Dec 25, 2016 at 10:37 PM, Christofer Bogaso
>> <bogaso.christofer at gmail.com> wrote:
>>> Hi again,
>>>
>>> I posted this in general R thread, however it is suggested this group
>>> since I am using MAC OS 10.7.5.
>>>
>>> I was following the instruction available in
>>> "http://stackoverflow.com/questions/3053833/using-r-to-download-zipped-data-file-extract-and-import-data"
>>> to download data from Internet contained in a zip file from the
>>> address :
>>>
>>> https://npscra.nsdl.co.in/download.php?path=download/&filename=NAV_File_23122016.zip
>>>
>>> However when I tried to follow the instruction I am facing below error :
>>>
>>>> temp <- tempfile()
>>>> download.file("https://npscra.nsdl.co.in/download.php?path=download/&filename=NAV_File_23122016.zip",temp)
>>> Error in download.file("https://npscra.nsdl.co.in/download.php?path=download/&filename=NAV_File_23122016.zip",
>>> :
>>>  unsupported URL scheme
>>>
>>> Can someone here please tell me what went wrong in above?
>>>
>>> Highly appreciate your feedback.
>>>
>>> Thanks for your time.
>>>
>>> _______________________________________________
>>> R-SIG-Mac mailing list
>>> R-SIG-Mac at r-project.org
>>> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>>
>> _______________________________________________
>> R-SIG-Mac mailing list
>> R-SIG-Mac at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>