I know there are a ton of questions pertaining to this subject but I cannot get this to work. The program ran fine on my laptop, but when I try to compile and run it in the the schools Linux lab the program cannot open the file. I have tried defining the absolute file position but nothing has worked. The file name is correct and everything but when I try to run the program it displays "failed". I'm using gedit and compiled the program with bash.
ifstream fin("rainfall.dat"); // If the file cannot open display failed
if(fin.fail()){
cout << "failed" << endl;
return 1;
}
try
#include <errno.h>
if(fin.fail())
perror("open failed ");
this will give you a human readable message for the last error
Related
I'm trying to open a .txt file that contains integer values 0-9 each individual number on its own line till the last number is 9. When i run the code i'm using im running into an issue with opening my txt file. Based on the if and else statement provided its failing to open what is causing this and what method can i use to open my notepad .txt file.
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main()
{
ifstream infile; //Container for the file
infile.open("assignmentG1.txt"); //Name of the file you want to open
string stringFromFile; //string variables to store extracted strings
if(infile.fail()) {//Display error if the file failed to open
cout<<"Input file failed to open";
}
else
{
getline(infile, stringFromFile);
}
cout<<stringFromFile;
}
input file failed to open.
The code works as expected, just make sure you execute the compiled program from the directory where the text file exists.
Assuming the source code is added to a file named main.cpp and running on Linux or macOS with gcc compiler installed, the following works:
echo "Hello" > assignmentG1.txt
g++ main.cpp -o main
./main
Hello
Your file should be at correct path if your project name is suppose project_name so keep the file at /project_name/project_name/assignmentG1.txt .
Assuming you are using visual studio.
I'm using Netbeans 8.2 and I am programming with C++.
I'm trying to read a file. I have put it in the correct project folder of sources and I have used #include <fstream> .
ifstream myfile ("figures.txt");
code...
myfile.close();
I have the file in the correct place. But this message pops up:
Unrecognized file
Then, my other part of code also gives me error, because never detects the file I'm talking about open.
if (myfile.is_open()){
code...
}else{
cout << "file not open" << endl;
}
Auto solved, the .txt must be in the project folder, not in nbproject folder. At least it has worked doing it this way. Any more reccomendations will be accepted!
Like the questioner in "New to Xcode can't open files in c++?" I'm learning Xcode and OS X (I'm using Xcode 7 on a Yosemite mac).
I can get the code to work perfectly when I build and run it, but can't get the executable to work when I try to run it as a stand alone program.
I'm trying to translate some games I've written on a PC in C++ using SFML.
There has to be a way to save high scores and previous games within an app, but this has me stymied.
This is the sample code I used based on the previous question:
#include <string>
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream fin;
ofstream fout;
string input;
fin.open("inputFile.txt");
if(fin.fail())
cout << "File failed to open." << endl;
fin >> input;
fin.close();
fout.open("outputFile.txt");
fout << input;
fout << "\n Data transferred \n";
fout.close();
}
This works perfectly when I build and run it, so I've got the proper path to the desktop folder set up. (I'm putting the data files in the same folder as the executable and specifying the path in Xcode.)
No problems when I run this within Xcode, but this is the message on the terminal console when I run the executable by itself:
"…/Desktop/datafiles/Build/Products/Debug/datafiles ; exit;
…/Desktop/datafiles/Build/Products/Debug/datafiles ; exit;
File failed to open.
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
[Process completed]"
Is there another flag or path that needs to be set within Xcode for this to work? Two other related questions: How do I access the terminal history to see what is going on? Finally, if I set up the project as an SFML app instead of a terminal project (command line tool app), why can't I see the files within the SFML app, even though I've set the command line flag to see hidden files, and I can see other hidden files on my hard drive? I can see the files if I open the SFML app folder in Windows, so I know they are there.
This is my first question on Stack Overflow, so apologies if this should be appended to the previous question, but this doesn't appear to be an answer to me, but is quite a different version of the original question that is not addressed in the answers.
Thanks!
I am having a strange issue. I have a function (writedata) that take a string and writes it to a file. Is works fine and files are created when I build and run the program within xCode.
When I export the compiled project from xCode and just try to run the executable terminal app no file is ever written. I can see the process completes in terminal with no errors given. I even get the 'cout<<"Done. File Written!"' message but no file.
void writedata(string writedata, string filename){
ofstream data(filename, ios::app);
if (data.is_open())
{
data<<writedata;
cout<<"Done. File Written!";
data.close();
}
else cout << "Unable to open file";
data.close();
}
Does anyone know why this is happening?
Playing around wit boost library using ubuntu, with the following code the file main.cpp gets open and being printed but when I try to open some other file on some other location, it does not work.
Here is the code
std::string line;
boost::filesystem::ifstream file ("main.cpp") ;
if (file.is_open())
{
while ( getline (file,line) )
{
std::cout << line << '\n';
}
file.close();
}
else std::cout << "Unable to open file"<< std::endl;
Here is the path that I am giving and its not working.
boost::filesystem::ifstream file ("/home/0circle/workspace/practice/main.cpp") ;
can someone tell me what could be the problem and how to cure it ?
Thanks :)
Make sure the file exists and you have permissions for reading the file:
execute in shell: ls -l /home/0circle/workspace/practice/main.cpp
verify if you have read rights (first column of the output of the
previous shell command). See this!
try to find out reason of failure: See this!