First things first - read and write to files. Found this tutorial using Visual Studio, but can't be too different.
ifstream
ofstream
Found this tutorial on it as well, but you can copy and paste this one. Here's the program I wrote to read a file, and write to a file (although couldn't get it to create a file):
ifstream
ofstream
Found this tutorial on it as well, but you can copy and paste this one. Here's the program I wrote to read a file, and write to a file (although couldn't get it to create a file):
/* * File: main.cpp * Author: Supermonkey * * Created on 27 May 2015, 07:16 */ #include#include #include #include using namespace std; void readFile(string filename); void writeFile(string filename); /* * */ int main(int argc, char** argv) { string readFilename = "newhtml.html"; string newFilename = "newtxt.txt"; readFile(readFilename); writeFile(newFilename); return 0; } void readFile(string filename) { string line; ifstream myfile ("newhtml.html"); if (myfile.is_open()){ while ( getline (myfile,line) ){ cout << line << '\n'; } myfile.close(); } else cout << "Unable to open file"; //return 0; } void writeFile(string filename) { ofstream myfile ("newhtml1.html"); if (myfile.is_open()) { myfile << "This is a line.\n"; myfile << "This is another line.\n"; myfile.close(); } else cout << "Unable to open file"; //return 0; }
Managed to find this forum on why I couldn't pass a string into the ifstream and ofstream perameters. To get it to work you have to convert the C++ string to std:string :
ifstream myfile (filename.c_str());
I've now created a couple of functions which read a line from one file, and write it to another. I found this explination of how to append to a file, as with the above code it would only wipe the file and replace contents with the last line.
void readWriteFile (string readFile, string writeFile) {
string line;
ifstream myfile (readFile.c_str());
if (myfile.is_open()){
while ( getline (myfile,line) ){
cout << line << '\n';
writeLineToFile (line, writeFile);
}
myfile.close();
}
else cout << "Unable to open file";
}
void writeLineToFile (string line, string writeFile) {
ofstream myNewfile;
myNewfile.open (writeFile.c_str(), std::ofstream::out | std::ofstream::app);
if (myNewfile.is_open())
{
myNewfile << line << "\n";
myNewfile.close();
}
else cout << "Unable to open file";
//return 0;
}
