StringStream - read and parse the contents of a file - C++ File Stream

C++ examples for File Stream:stream

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Description

StringStream - read and parse the contents of a file

Demo Code

#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <sstream>
#include <iostream>
using namespace std;

bool parseString(const char* pString,char* pName, int arraySize,long& accountNum, double& balance){
    istringstream inp(pString);/*www  . j  a  v a 2s.  c  om*/

    inp.getline(pName, arraySize, ',');

    inp >> accountNum;

    inp >> balance;

    return !inp.fail();
}

int main(int nNumberofArgs, char* pszArgs[])
{
    char szFileName[128] = "main.cpp";

    ifstream* pFileStream = new ifstream(szFileName);
    if (!pFileStream->good()){
        cerr << "Can't open " << pszArgs[1] << endl;
        return 0;
    }
    for(int nLineNum = 1;;nLineNum++){
        char buffer[256];
        pFileStream->getline(buffer, 256);
        if (pFileStream->fail())
        {
            break;
        }
        cout << nLineNum << ":" << buffer << endl;

        char name[80];
        long accountNum;
        double balance;
        bool result = parseString(buffer, name, 80, accountNum, balance);
        if (result == false){
            cerr << "Error parsing string\n" << endl;
            continue;
        }
        cout << "Read the following fields:" << endl;
        cout << "  name = " << name << "\n"
             << "  account = " << accountNum << "\n"
             << "  balance = " << balance << endl;

        ostringstream out;
        out << name << ", " << balance << " " << accountNum << ends;

        string oString = out.str();
        cout << "Reordered fields: " << oString << endl;
    }
    return 0;
}

Result


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