How can I add a char to an istringstream?

» cpp » How can I add a char to an istringstream?

By : Duane Smeckert

Date : November 16 2020, 04:01 AM

will help you I'm trying to add a char to an istringstream - as so: ,
I'm trying to add a char to an istringstream

code :

ostringstream output_buffer;    

while (is.get(c)) {
    output_buffer << c;
}

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How to create C++ istringstream from a char array with null(0) characters?

By : AX5

Date : March 29 2020, 07:55 AM

around this issue I have a char array which contains null characters at random locations. I tried to create an iStringStream using this array (encodedData_arr) as below, , There is nothing special about null characters in strings

code :

std::istringstream iss(std::string(data, N));
setBlob(&iss);

std::istringstream iss("haha a null: \0");

std::istrstream iss(data, N);

struct myrawr : std::streambuf {
  myrawr(char const *s, size_t n) { 
    setg(const_cast<char*>(s), 
         const_cast<char*>(s), 
         const_cast<char*>(s + n));
  }
};

struct hasb { 
  hasb(char const *s, size_t n)
   :m(s, n)
  { }
  myrawr m;
};

// using base-from-member idiom
struct myrawrs : private hasb, std::istream {
  myrawrs(char const *s, size_t n)
    :hasb(s, n), 
     std::istream(&static_cast<hasb*>(this)->m)
  { }
};

How to initialise std::istringstream from const unsigned char* without cast or copy?

By : user3317007

Date : March 29 2020, 07:55 AM

wish help you to fix your issue Your answer is still copying.
Have you considered something like this?

code :

const unsigned char *p;
size_t len;

std::istringstream str;
str.rdbuf()->pubsetbuf(
    reinterpret_cast<char*>(const_cast<unsigned char*>(p)), len);

$Read lines from istringstream ,without '\r' char at the end$

Read lines from istringstream ,without '\r' char at the end

By : Sarika

Date : March 29 2020, 07:55 AM

Does that help I have a following function : , You can remove the '\r' from the end using this code:

code :

if(line[line.length() - 1] == '\r') line = line.substr(0, line.length() - 1);

std::istream& univGetline(std::istream& stream, std::string& line)
{
    std::getline(stream, line);
    if(line[line.length() - 1] == '\r') line = line.substr(0, line.length() - 1);
    return stream;
}

void process (std::string str)
{
    std::istringstream istream(str);
    std::string line;
    std::string specialStr("; -------- Special --------------------");

    while (univGetline(istream,line))
    {
      if (strcmp(specialStr.c_str(), line.c_str()) != 0)
      {
          continue;
      }
      else
      {
         //special processing
      }
    }
}

Is there a way I can read two char from the istringstream?

By : daidailanlan

Date : March 29 2020, 07:55 AM

I wish this helpful for you
I expect the output of 78 5 + to be 83. However I am getting 13.

code :

int postFixEval(string str)
{
    istringstream in = istringstream(str);
    stack<int> postFixStack;
    skipWhiteSpace(in);

    while (in)
    {
        char ch = in.peek();
        if (isdigit(ch)) {
            int num;
            in >> num;
            postFixStack.push(num);
        }
        else {
            char op = in.get();
            if (op == '+') {
                int num1 = postFixStack.top();
                postFixStack.pop();
                int num2 = postFixStack.top();
                postFixStack.pop();
                postFixStack.push(num1 + num2);
            }
        }
    }
    return postFixStack.top();
}