从文本文件中读取大块行到字符串

Question

So say if I have this line in a text file.

AarI/CACCTGCNNNN'NNNN/'NNNNNNNNGCAGGTG//

What I want is to read this line into a string until the forwardslash appears and then start reading the next set of characters into another string.. So in this example I would have 3 strings containing

string1 =  "AarI"
string2 = "CACCTGCNNNN'NNNN"
string3 = "'NNNNNNNNGCAGGTG"

Any idea how to go about this?

Answer 1

istream::getline() with a delim character of '/' - see: http://www.cplusplus.com/reference/istream/istream/getline/

Not the best or safest, probably amongst the simpler approaches.

Answer 2

Use sstream . The code below shows an example of how to split a string.

#include <iostream>
#include <vector>
#include <string>
#include <sstream>

using namespace std;

vector<string> split(string str, char delimiter);

int main(int argc, char **argv) {

  string DNAstr = "AarI/CACCTGCNNNN'NNNN/'NNNNNNNNGCAGGTG//";
  vector<string> splittedlines = split(DNAstr, '/');

  for(int i = 0; i < splittedlines.size(); ++i)
    cout <<""<<splittedlines[i] << " \n";

  return 0;
} 


vector<string> split(string str, char delimiter) {
  vector<string> buffer;
  stringstream ss(str); 
  string tok;

  while(getline(ss, tok, delimiter)) {
    buffer.push_back(tok);
  }

  return buffer;
}