Printable View
Hi, if i'm reading from a text file using <fstream>, is there a way to skip to a particular line in the text file (for reading, not writing)? What would be the easiest way to do this?
So far, this is what I have coded to open/close the file.
Code:void readTxtFile()
{
string temp;
ifstream inData;
inData.open("indata.txt");
//not sure on the usage of the getline function
inData.getline(temp, '\n');
inData.close;
}
Read it all in and then parse the text (aka after four new lines ignore all text until the next newline).
Hmm.. when I try to use getline() this way, i'm getting a compiler error..
.\MP3Tool.cpp(146) : error C2664: 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::getline(_El em *,std::streamsize)' : cannot convert parameter 1 from 'std::string' to 'char *'
I could use a char[] instead of a string, but with the file i'm reading, the line of text i'm going to read isn't always going to be the same size. How can I get around this?
std::string.c_str().
You need to use:
std::getline(inData,line);
There is no variable 'line' declared..Quote:
Originally Posted by Cat
My problem is that when I call getline using a string as the 1st parameter, I get a compiler error. How can I store a line of text from a .txt file in a string?
Please help!! I've got a term project due wednesday!
The first parameter is the filestream, the second parameter is your string variable. Just change line to temp. You should have a reference that tells you what the different standard functions and their parameters do.
*check topic 'reading second line' (he (or she) pretty much sumed it up)Code:ifstream inData("indata.txt");
const int line_length = 255; //declare size
char line[line_length]; // store line
inData.getline(line,line_length); // Read line
cout << line << endl; // Output line
inData.ignore (line_length,'\n'); //skip next line
inData.getline(line,line_length); // Read 3rd line
cout << line << endl; // Output 3rd line
cout << "\n";
cout << "press any key to exit \n";
std::cin.get();
inData.close();
return 0;
}