get data from input stream c++

[manjut19]

#include <fstream>
#include <string>
using namespace std;

ifstream inf("file name");
string line;

    while (inf.good()) {
        getline(inf, line);
           }

instead of line by line i want the complete data from file to the string.What modification i have to do?

[VictorN]

Don't you have a documentation about ifstream?
http://msdn.microsoft.com/en-us/library/ae1k9a9f.aspx
http://www.cplusplus.com/reference/f...fstream/rdbuf/

[laserlight]

There are a few ways, e.g., you could read line by line and then append to a string. However, one way that comes to mind is:

#include <fstream>
#include <sstream>
#include <string>

int main()
{
    using namespace std;
    ifstream inf("file name");
    stringstream ss;
    ss << inf.rdbuf();
    string content = ss.str();
    // ...
}

By the way, your method of reading line by line is wrong. You should not be calling inf.good() to control the loop. Rather:

while (getline(inf, line)) {
    // ...
}

[D_Drmmr]

Here's another way

#include <fstream>
#include <string>

int main()
{
    std::string str;
    std::ifstream inf("file name");
    inf.seekg(0, std::ios::end);
    str.resize(inf.tellg());
    inf.seekg(0, std::ios::beg);
    inf.read(&str[0], str.size());
}