reading line

Hi Guys!

how to get the text from file before any space come

suppose i have file and it reads

Code:

---

aa    this is a
bb    this is b
cc    this is c

---

i am only interested in aa, bb, cc not the rest of the text. or in other words ignore the text that is after space.

so i came up with this code

Code:

---

std::ifstream file("abc.txt");
std::string str;
while (file >> str /* read next word */)
{
        std::cout << str << std::endl;
        file.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); /* ignore rest of line */
}

---

but there is problem, Is there any such a method in which I can use before or after this file.ignore(), to actually keep the rest of the line? I mean, the rest of the line shall be used.

Considering that the first column of the text file is an integer, something inside of the while loop like:

Code:

---

value = atoi(str.c_str());
(if value==1){
    cout <<restOfTheLine<<endl;
}

---

BR

Ewa

You could use getline instead

Code:

---

std::ifstream file("abc.txt");
std::string str;
std::string restofline;

while (file >> str /* read next word */)
{
    std::cout << str << std::endl;
    std::getline(file,restofline);
    value = atoi(str.c_str());
    if ( value==1){
        cout <<restofline <<endl;
    }
}

---

Kurt

Quote:

---

Originally Posted by me_newbie

i am only interested in aa, bb, cc not the rest of the text. or in other words ignore the text that is after space.

[...]

but there is problem, Is there any such a method in which I can use before or after this file.ignore(), to actually keep the rest of the line? I mean, the rest of the line shall be used.

---

Errr, now what do you want: discard it or keep it? :confused:

At any rate, this question has nothing to do with C++/CLI, the .NET variant of C++, which the forum section here is about. It would much better be placed in the Non-Visual C++ section. So I suggest you repost it there, unless a moderator spots it first and moves it.