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Full Discussion: Download http picture using C++
Top Forums Programming Download http picture using C++ Post 302964186 by emily on Tuesday 12th of January 2016 03:06:05 AM
Old 01-12-2016
Download http picture using C++
Dear all,
I am working on writing the script which can read a file (having the html path for some pictures) and download those picture in the given local directory. Please find my iniatitve here, however I am still not able to figure out the 'download' command.
Any help is appreciated.

thanks,
emily

Code:
#include <iostream>
#include <sstream>
#include <string>
#include <fstream>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

void help() {
  cout << " You must provide one input parameters: " << endl;
  cout << "   1) Name of File containing donlwoad path" << endl;
  exit(0);
}


main(int argc, char *argv[]) {
  if (argc < 2) help();
  string InFile   = argv[1];
  ifstream FileToRead(InFile.c_str());

  // debug step                                                                                                                                                                                                 
  if(!FileToRead.is_open()) {
    cout << "Problem opening the file. Program terminating." << endl;
    exit(EXIT_FAILURE);
  }

  std::string line;
  //  while(!FileToRead.eof()) {                                                                                                                                                                                
  while(std::getline(FileToRead, line))
    {
      FileToRead >> line;
     wget line;                                                                                                                                                                                              
    }
}

 

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LEARN ABOUT OSX

lwp-download5.16

LWP-DOWNLOAD(1) 					User Contributed Perl Documentation					   LWP-DOWNLOAD(1)

NAME

       lwp-download - Fetch large files from the web

SYNOPSIS

       lwp-download [-a] [-s] <url> [<local path>]

DESCRIPTION

       The lwp-download program will save the file at url to a local file.

       If local path is not specified, then the current directory is assumed.

       If local path is a directory, then the last segment of the path of the url is appended to form a local filename.  If the url path ends with
       slash the name "index" is used.	With the -s option pick up the last segment of the filename from server provided sources like the Content-
       Disposition header or any redirect URLs.  A file extension to match the server reported Content-Type might also be appended.  If a file
       with the produced filename already exists, then lwp-download will prompt before it overwrites and will fail if its standard input is not a
       terminal.  This form of invocation will also fail is no acceptable filename can be derived from the sources mentioned above.

       If local path is not a directory, then it is simply used as the path to save into.  If the file already exists it's overwritten.

       The lwp-download program is implemented using the libwww-perl library.  It is better suited to down load big files than the lwp-request
       program because it does not store the file in memory.  Another benefit is that it will keep you updated about its progress and that you
       don't have much options to worry about.

       Use the "-a" option to save the file in text (ascii) mode.  Might make a difference on dosish systems.

EXAMPLE

       Fetch the newest and greatest perl version:

	$ lwp-download http://www.perl.com/CPAN/src/latest.tar.gz
	Saving to 'latest.tar.gz'...
	11.4 MB received in 8 seconds (1.43 MB/sec)

AUTHOR

       Gisle Aas <gisle@aas.no>

perl v5.16.2							    2012-01-13							   LWP-DOWNLOAD(1)
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