C++ , how do i get a particular string in a html code

Question

I am trying to parse this XML Yahoo feed.

How do i like get each record into an array in C++ like create a structure

then got those variable and record each element inside the structure.

In the first place, how do i get the value out

Thanks

C++ has std::string::find() and std::string::substr(). You can use these to locate and extract the data you are looking for. — hmjd
– hmjd, Commented Jul 23, 2012 at 15:47

Ryan Endacott · Accepted Answer · 2012-07-23 15:47:15Z

5

You may want to see if the given page offers output in a JSON format. Then you can simply request the value instead of messing around with HTML. The Yahoo! Finance site may even offer an API that you can use to easily request the value.

answered Jul 23, 2012 at 15:47

Ryan Endacott

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1 Comment

Baoky chen Over a year ago

I found the api, but how do i parse this to get e.g USD/SGD

perreal · Accepted Answer · 2012-07-23 16:07:06Z

0

If you want to mess with html code:

#include <iostream>
#include <fstream>
int main() {
  std::ifstream ifile("in.html");
  std::string line;
  std::string ndl("<span id=\"yfs_l10_sgdmyr=x\">");
  while(ifile.good()){ 
    getline(ifile, line);
    if (line.size()) {
      size_t spos, epos;
      if ((spos = line.find(ndl)) != std::string::npos) {
        spos += ndl.size();
        if ((epos = line.find(std::string("</span>"), spos)) != std::string::npos) {
          std::cout << line.substr(spos, epos-spos) << std::endl;
        }   
      }   
    }   
  }   
  return 0;
}

answered Jul 23, 2012 at 16:07

perreal

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2 Comments

perreal Over a year ago

do you have the in.html file?

Baoky chen Over a year ago

i was parsing this page link , i use lynx -source URL > buffer.txt , then the buffer is actually the source code. i changed your sgdmyr to usdsgd, but seems doesnt work

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