I'm trying to write to a file in C++, however as soon as I run my .exe file, I get the following error
"The procedure entry point __gxx_personality_v0 could not be located in the dynamic link library C:/Users..."
Here is my code
#include <iostream>
#include <fstream>
using namespace std;
int main(int argc, char *argv[])
{
ofstream outfile ("test.txt");
outfile << "Hello World\n"; // error happens here
return 0;
}
I managed to fix the problem by copying libstdc++-6.dll from C:\MinGW\bin into the directory of my project!
try this code
#include<iostream.h>
#include<conio.h>
#include<fstream.h>
int main()
{
ofstream outfile;
outfile.open("text.txt")//opening the file
outfile<<"Hello world";
outfile.close();//closing the file
return 0;
}
whenever we are dealing with files, there should be opening the file and closing the file. For this program , the arguments inside the main function is not needed.
Related
So I have a Test folder inside my workspace in CodeLite and inside Test folder I have:
main.cpp
test.txt
The problem is whenever I try to read from test.txt, the compiler deletes the file content and writes "Debug/main.cpp.o" inside my test.txt file. For example, if my txt file contains the following text:
Abcd ef
And my code inside main.cpp:
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main(){
string data;
ifstream infile;
infile.open("text.txt");
cout << "Reading from the file" << endl;
infile >> data;
return 0;
}
When I run my code the output should be:
Reading from file
Abcd
ef
But instead, the output is:
Reading from file
And now my test.txt contains:
Debug/main.cpp.o
I am also inserting what my folder contains:
I don't know why it does this. Can anyone help?
Codelite generates $(project).txt ($(project) is Test in your case) with all objects filename for compilation (as response file (to bypass limit of command line length when there are too many files)).
Either place project in another directory or rename the file or project to avoid the conflict with that file.
This is happening because you haven't use/printed the data variable.
Use this code
#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main(){
string data;
ifstream infile;
infile.open("test.txt");
cout<<"Reading from file"<<endl;
while (getline(infile,data))
{
cout<<data<<endl;
}
return 0;
}
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
int A;
ifstream file("file.txt"); // there is a single "8" in the file
file >> A;
cout << A; // I get 0 always
return 0;
}
While I'm not new to CodeBlocks, I'm new to CodeBlocks on Mac. I have changed the "Execution working directory" and it still does not work, please help.
Don't change the execution working directory.. When you're reading from file, try writing the full directory where is that file, for example:
// this is your file.txt location
ifstream file("C:\\Desktop\\file.txt"); // this is for Windows
and then run a program.
If it still doesn't work, try watching this tutorial: https://www.youtube.com/watch?v=De6trY8FRYY
Here's the code.
#include <iostream>
#include <fstream>
using namespace std;
int main(int argc, const char * argv[])
{
ifstream myfile;
myfile.open("numbers.txt");
if (myfile.is_open()){
cout <<" okay to proceed" << endl;
} else {
cout<< "error finding file" <<endl;
}
}
The file is as named, exactly and in the same folder as the program.
What am I doing wrong? The is_open() check is failing >_<
Edit: Solved. Found the working directory under product - scheme - options
Plenty of reasons:
1. No r permission (no access to read file)
2. "numbers.txt" is in some other directory, not one application was started
...
Use full path in myfile.open("FULLPATH/numbers.txt"); just to be sure you are open correct file.
Than check access rights (OS dependent)
Hey all, I have a problem, I don't know how to create a file in C++ in a specific place in the PC. For example a file (.txt) in C:\file.txt. Can anybody help me? Thank you :)
#include <iostream>
#include <fstream>
using namespace std;
int main() {
ofstream ofs("c:\\file.txt");
if (ofs) {
ofs << "hello, world!\n";
}
return 0;
}
It's probably fooling you because it's easier than you think. You just open a file for create and give it that path name. Voila.
See, eg,
// fstream::open
#include <fstream>
using namespace std;
int main () {
fstream filestr;
// You need a doubled backslash in a C string
filestr.open ("C:\\file.txt", fstream::out);
// >> i/o operations here <<
filestr.close();
return 0;
}
#include <stdio.h>
....
FILE *file;
file = fopen("c:/file.txt", "w");
I want to create a file using C++, but I have no idea how to do it. For example I want to create a text file named Hello.txt.
Can anyone help me?
One way to do this is to create an instance of the ofstream class, and use it to write to your file. Here's a link to a website that has some example code, and some more information about the standard tools available with most implementations of C++:
ofstream reference
For completeness, here's some example code:
// using ofstream constructors.
#include <iostream>
#include <fstream>
std::ofstream outfile ("test.txt");
outfile << "my text here!" << std::endl;
outfile.close();
You want to use std::endl to end your lines. An alternative is using '\n' character. These two things are different, std::endl flushes the buffer and writes your output immediately while '\n' allows the outfile to put all of your output into a buffer and maybe write it later.
Do this with a file stream. When a std::ofstream is closed, the file is created. I prefer the following code, because the OP only asks to create a file, not to write in it:
#include <fstream>
int main()
{
std::ofstream { "Hello.txt" };
// Hello.txt has been created here
}
The stream is destroyed right after its creation, so the stream is closed inside the destructor and thus the file is created.
#include <iostream>
#include <fstream>
int main() {
std::ofstream o("Hello.txt");
o << "Hello, World\n" << std::endl;
return 0;
}
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
string filename = "/tmp/filename.txt";
int main() {
std::ofstream o(filename.c_str());
o << "Hello, World\n" << std::endl;
return 0;
}
This is what I had to do in order to use a variable for the filename instead of a regular string.
Here is my solution:
#include <fstream>
int main()
{
std::ofstream ("Hello.txt");
return 0;
}
File (Hello.txt) is created even without ofstream name, and this is the difference from Mr. Boiethios answer.
If you want to create a file with some content and don't need to deal with the ofstream after that you can simply write:
#include <fstream>
int main() {
std::ofstream("file.txt") << "file content";
}
no need to manually close the file, deal with variables, etc. The file is created, written, and closed in the same line.
/*I am working with turbo c++ compiler so namespace std is not used by me.Also i am familiar with turbo.*/
#include<iostream.h>
#include<iomanip.h>
#include<conio.h>
#include<fstream.h> //required while dealing with files
void main ()
{
clrscr();
ofstream fout; //object created **fout**
fout.open("your desired file name + extension");
fout<<"contents to be written inside the file"<<endl;
fout.close();
getch();
}
After running the program the file will be created inside the bin folder in your compiler folder itself.
use c methods FILE *fp =fopen("filename","mode");
fclose(fp);
mode means a for appending
r for reading ,w for writing
/ / using ofstream constructors.
#include <iostream>
#include <fstream>
std::string input="some text to write"
std::ofstream outfile ("test.txt");
outfile <<input << std::endl;
outfile.close();