Set a string data type as the output stream in C++

I have a method called prettyPrintRaw that seems to format the output in a visually appealing manner. However, I am having trouble understanding what this specific code does and what kind of data it returns. How can I assign the return value of this code to a string variable so I can access it from my JavaScript code?

std::ostream & prettyPrintRaw(std::ostream &out, const std::vector<unsigned char> &buf) {

vector<unsigned char>::const_iterator ptr = buf.begin();

vector<unsigned char>::const_iterator end = buf.end();

int i = 0;

  while (ptr != end) {

    char c = (char) *ptr; 

    if (c >= ' ' && c <= '~') {
      out.put(c);
      barCodeDataChar[i] = c;
      i++;
    }
    else
      out << '{' << (int) c << '}';

    ptr++;
  } // end while

  return out;

} // end function

Apologies for not being able to provide a clear explanation of this particular snippet of code.

javascriptc++visual-studio

Answer №1

To simplify the code, you can eliminate the std::ostream &out parameter and instead use a string stream to create your string value.

Retrieve the string using myStringStream.str().

#include <sstream>
#include <string>

std::string prettyPrintRaw(const std::vector<char> &buf) {

    auto ptr = buf.begin();
    auto end = buf.end();
    std::stringstream out;

    int i = 0;

    while (ptr != end) {

        char c = (char) *ptr; 

        if (c >= ' ' && c <= '~'){
            out.put(c);
            i++;
        }
        else {
            out << '{' << (int) c << '}';
        }

        ptr++;
    }

    return out.str();
}

Edit:

Note that std::vector is a template class and requires a template paramter. Also, it's recommended to declare iterators using auto in modern IDEs.

Edit 2:

The line barCodeDataChar[i] = c; in the provided code example is incorrect as barCodeDataChar is not defined.

Answer №2

Hey there Kanjio, I really appreciate your help! However, in order to get it up and running, I needed to implement the following modifications:

std::string prettyPrintRaw1(const std::vector<unsigned char> &buf) {

    vector<unsigned char>::const_iterator ptr = buf.begin();
    vector<unsigned char>::const_iterator end = buf.end();
    std::stringstream out;
    
    int i = 0;
    
    while (ptr != end) {
    
        char c = (char) *ptr; 
    
        if (c >= ' ' && c <= '~'){
            out.put(c);
        }
        else {
            out << '{' << (int) c << '}';
        }
    
        ptr++;
    }
    
    return out.str();
}

}

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