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!
Related
The title is a bit long-winded, but basically, I've written an app that reads and writes its input and output to text files. The entire time, it would read and write the files directly in the same directory as my Xcode derived data->project->build->products->debug folder. This was where everything was being written to and read from. I don't have a custom path set up for the application, so it just saves wherever the app is located. For the first time ever, I ran Apple's Instruments app, to try to learn how to use a profiler. Not long after selecting this app as the target in Instruments, I went back to the Xcode app to run the program some more. Everything works fine in Xcode. It reads from the files and prints to files in the same location as the folder, but if I try to run the actual program itself by clicking on the file and having it open terminal, it no longer reads or prints to the directory that app is in. Instead, its printing and reading from my home folder. I don't know what changed or what caused it to change, but I'm hoping its a simple fix. I'd like for the application to read from files and print files from the directory its located in again. I'm not sure if its an Xcode setting or a Terminal setting.
Any help would be greatly appreciated.
Update 1: Tried this with no luck:
how to change the working directory to the location of the program
The directory field was blank, so I thought this would the solution, but filling it in with the suggestion did nothing to alleviate the issue.
Update 2:
Just tried deleting the preference file, still no solution. I'm willing to give someone reputation. I don't have a whole lot because I'm a newer member, but I'll give what the person thinks is fair, to whoever solves it. I'm desperate and really don't want to wait 2 days to have this issue solved.
Update 3:
Tried changing the default path in the "Profile (release)->options area in the scheme section to the default variable suggested in update 1. No luck. I'm beginning to lose my mind.
Update 4:
I've tried deleting the scheme entirely and making a new one, in hopes that maybe there was something botched with the scheme, but this did not solve the issue. Input and output while running the app in Xcode is still using the working directory, while running the executable in the debug folder is using the home folder.
Update 5:
Just tested this on an older iMac and Xcode setup (OS 10.8.5 and Xcode 5.1.1) and it seems to be working correctly, reading and writing to the current working directory of the application in the debug folder.
For whatever reason, the solution suggested by https://stackoverflow.com/a/15537436/1035008 no longer works. Maybe broken in Xcode 8.1. But this seems to work:
#include <iostream>
#include <fstream>
#include <unistd.h>
using namespace std;
int main (int argc, const char * argv[])
{
// argv[0] returns the full path to the program, in my case "/Users/yuchen/Library/Developer/Xcode/DerivedData/../Debug/test
string directory(argv[0]);
// And we want to get rid of the program name `test`
directory = directory.substr(0, directory.find_last_of("/"));
// Point the directory to the program directory
chdir(directory.c_str());
cout << "Current directory is: " << getcwd(NULL, 0) << endl; // /Users/yuchen/Library/Developer/Xcode/DerivedData/../Debug/
ifstream fin("hi.txt");
if (fin.is_open()) cout << "File is Open" << endl;
else cout << "File is not open" << endl;
fin.close();
return 0;
}
Also see SO and SO. Hope this helps.
Compiled through compiler like Code::Blocks, I have tried the following, bit it does not work:
/*Running Firefox.exe*/
#include <stdio.h>
/*using c++*/
#include <iostream>
#include <stdlib.h>
using namespace std;
int main ()
{
int x;
cout << "Checking if processor is available..." << endl;
/*System used here*/
if (system(NULL)) puts ("Proceed");
else exit (1);
cout<< "Executing Firefox..." << endl;
/*Having some error here saying not recognized as internal or external command*/
x = system ("C:/Program Files (x86)/Mozilla Firefox/firefox.exe");
/*cout here*/
cout <<"The value returned was:" << x << endl;
return 0;
}
Is it because Firefox is not recognized as a system of windows? If so how can I run Firefox, or even Internet Explorer from code?
Run cmd.exe (Windows command shell) and enter the string C:/Program Files (x86)/Mozilla Firefox/firefox.exe at the command line, and you will see the same problem - i.e. the problem is with your command string rather than your C++ code.
The space in the path requires the command string to be quoted:
system ("\"C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe\"") ;
or
system ("\"C:/Program Files (x86)/Mozilla Firefox/firefox.exe\"") ;
I believe you need to convert path to DOS format
Launch a command prompt cd into Mozilla Firefox folder
run this: for %I in (.) do echo %~sI
Copy the output to system command with \ replaced with \\ append firefox.exe at end
Is it because Firefox is not recognized as a system of windows?
If you open up cmd.exe and type in C:/Program Files... it won't work because spaces are used as a delimiter. Quote your path:
system("\"C:/Program Files (x86)/Mozilla Firefox/firefox.exe\"");
Although if you're targeting Windows you should consider using CreateProcess which saves you this trouble.
If so how can I run Firefox, or even Internet Explorer from code?
If you want to show a web page, use ShellExecute* and let the shell do the work. It will take care of launching Firefox, Internet Explorer, Chrome, or whatever browser the user has configured to view web pages.
*Read the Remarks section about initializing COM, first.
Try using windows API CreateProcess API
I'm getting started with C++ and I use Qt Creator (I run Lubuntu 13.04).
Today, as any good start with programming, I wrote my Hello World program to see if things work after installing Qt5 and Qt Creator.
I created a new Console Application project and wrote:
#include <iostream>
using namespace std;
int main()
{
cout<<"Hello World!";
return 0;
}
Saved my project as Test, and tried to run it.
I just keep getting
Starting /home/MYUSERNAME/Qt Programming/Test/Test...
Cannot change to working directory '/home/MYUSERNAME/Qt Programming/Test': No such file or directory
/home/MYUSERNAME/Qt Programming/Test/Test exited with code -1
Any ideas on how to fix this?
Thanks in advance.
Just maybe problem is a space in 'MYUSERNAME/Qt Programming/Test'.
Anyway take a look in project build settings. Something is wrong with path where compiler is looking for your project
Are you sure there is a "Test" directory in the "/home/MYUSERNAME/Qt Programming/Test" directory ?
Using my qt4 installation I've tried starting a new Qt Console Application, chosen the folder to create project in, typed out Test for the Project name hit next, deselected Debug, but kept release. Hit next. chose none for version control, hit finish.
Program skeleton shows up. Must delete the include statement for QCoreApplication. Replace it with iostream. Deleted "QCoreapplication a" and "return a.exec". put in std::cout<<"Hello World \n"; and return 0;. Then I saved everything hit the play button and xterm is opened and displays hello world. No problems here. I even tried with spaces in directory names. Again no problems.
Then I tried creating project non-qt-project->plain c++ project. After the same menus as above, found a skeleton with exactly your code except with an endl at the end of cout statement. Hit the play button. Again no problems here. Again it opened up xterm and printed out Hello World!
Don't know what else to tell you. If you changed the name to Test AFTER you created the project, I would say, start again and this time don't change the name.
I may install qt5 on my opensuse 12.3 x86_64 installation and will be able to see if there are problems with it.
I have a very simple C++ program with a very simple project setup, but when I run the program I get no output. If I run the program in debug mode, it works perfectly. I am using Eclipse Kepler CDT 32 bit on windows with MinGW. I am somewhat new to eclipse, so it's probably something I did wrong.
The program is:
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
ofstream outfile("testdata.txt");
int main()
{
outfile << "Program Start\n";
cout << "Program Start\n";
return 0;
}
Help!
If the problem is that the program quickly opens and then closes before you can see the output on the screen, then you can just run your program from any shell (CMD on Windows, bash on Linux, etc.). That way, it won't exit once your program ends and you can see the results.
Make sure also that you flush/close your ofstream before your program exits.
The problem is rather not releted to c++ itself. You should check if via "cmd" typying it in "launch menu" after you click start. Find the path of your program, then run it.
For the very beginning it is recommended to spend a few hours with terminal(cmd). To know how things works. After that you will be independent - you will be able to write the code in any IDE. Also simple trick to make it working is to use std::cin.get() . It is prefered to system("pause").
You open the testdata.txt file using the relative path.
And the created file may be created in the project binary output path, where the executable located in.
You can use everything software to check whether a file is created and its created path.
everything
For example, you can type your output file name testdata.txt into everything software to see where output file created.And check if the testdata.txt created in a wrong path or directory.
I've been trying to get into C++ programming with Eclipse, but I'm having problems setting up Eclipse.
I have MinGW installed and in the environment path, and I created the simple C++ project with the following source code:
#include <iostream>
int main(void)
{
std::cout << "what is your name? ";
std::string name;
std::cin >> name;
std::cout << "Hello, " << name << std::endl;
std::cin.ignore();
return 0;
}
After successfully building the project (both debug and release configurations), I click the run button and there's no output. The program terminates immediately. I've also tried running in debug mode, but then it will wait for me to type in a name, then display all the output. example console:
scott
what is your name? Hello, scott
I've tried this with both the 32 and 64 bit Windows versions of Eclipse Helios and both versions have the same behavior. Does anyone know what is going on and how to fix this?
I've run the program from the command-line and it works as intended.
edit: After some tinkering around, I found that by copying the MinGW dll's into the same folder as the executable the program will run in Eclipse just fine. Is there an alternative method to have Windows find the dll's in MinGW's bin folder rather than have to copy them over each time?
Is there an alternative method to have Windows find the dll's in MinGW's bin folder rather than have to copy them over each time?
Set the PATH environment variable in the run configuration settings (Run -> Run Configurations... -> Environment).