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.
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.
It's been days since I try to make my IDE (Code::Blocks version 13.12, I tried on 10.05 too) work. Any program (including a simple Hello World! program) I would make would show a black console showing nothing but an " _ ". I have made an exception in my antivirus (Avast!) for the file containing the IDE) but the same thing happens . I have tried re-installing twice, i have tried resetting the compiler and debugger's settings to default, auto-detecting toolchain executables ,but the same thing happens.
I have tried rebooting my computer several times, same thing happens.
I would like to know what I can do to solve this problem , because I don't want to get another complicated compiler (I am a beginner,) , as Code::Blocks fits my needs perfectly.
The following codes produces a blank console:
#include <iostream>
int main()
{
std::cout << "Hello world!\n";
return 0;
}
I had the same exact problem, with Eclipse, Visual Studio and then with Code::Blocks (I tested them all). I suggest you follow this video tutorial after you confirm the problem persists with a second IDE : https://www.youtube.com/watch?v=zOGU8fC3bvU&index=6&list=LLHcXdIeBMN4XYRZAk4IeXmg&spfreload=10 . It will take you step by step on how to install a given compiler.
I am very new to work c++ Programs with Netbeans IDE in Ubuntu. I wrote a simple Hello World Program and tried to debug it using step Into. When I Click Step Into Option From Debug Menu I got new window opened in the name of " Diassembly(main) " . The Debug process didn't reach my source code line at any way. I repeatedly click Step Into Function At last the process got end Without Tracing my source code line. But In the Debug output window I got the Correct Result.
#include <iostream>
using namespace std;
int main()
{
cout<<"Hello";
cout<<"World";
}
Why This process Control goes to the Diassembly (main) window ? How to rectify this problem ?
You must compile with -g option, otherwise the debugger won't be able to stop on a breakpoint. As for disassembling window - I can't reproduce that (I'm on Netbeans 7.4 in Ubuntu 13). You should just close the window if you don't need it.
First, you have to toggle a break point in your code by clicking on the line number of the line you want to stop in source window, if you did not. Then hit Debug.
Don't step into function that you not build from source, just step over it.
Pehaps that there is an answer here (i can't comment sorry)
"No source available for main()" error when debugging simple C++ in Eclipse with gdb
I was just trying to use Xcode for a very small C++ project, and wanted to see
some prints in the console, the thing is I did not see anything.
I tried to run a very simple code instead:
#include <iostream>
int main (int argc, char * const argv[]) {
std::cout << "Hello, World!\n";
printf("here");
return 0;
}
but still, nothing in Xcode console.
any idea why?
EDIT:
adding snapshot of the program:
EDIT 2:
found this,
and it's working:
How do I run a C++ program in Xcode 4?
That should work fine. Are you sure that you had the console displayed? Try command-shift-C or choose View->Debug Area->Activate Console.
If that doesn't help, try running your program from a Terminal window. Does the program display the expected output?
It sounds like when you created a new project (File > New > Project... ), you selected "C/C++ Library". Since libraries don't output to the console directly, that explains why Run was greyed out for you and running it doesn't output to the console.
Instead, you need to create a new project and select "Command Line Tool" template in the Application section, and build your program from there.
Your image doesn't show that you ran the program, only that you built it. Look at the Log Navigator (the last one, ⌘7) and see if there are any logs for 'Debug one' after 'Build one'. To run the program use Product > Run or ⌘R.
Try pressing Shift+Command+R. That should compile your program and open it in a terminal window.
maybe you need to add "\n" after "here"
I don't know why but it works for me.
Hope someone can explain it for me.
I just installed c/c++ development tools for my eclipse and everything is working except no text is being printed in the console when I run the hello world program, but I receive no errors. I'm really stumped, anyone know why this is?
Edit:
Ok I realized if that debug it, it works correctly, but not if I run it, any ideas there?
Are you using a 64-bit version of Eclipse? If so, that might be your problem. The 64-bit version doesn't do console output. sigh Try downgrading to the 32-bit version.
On SO, check this question.
On the Eclipse forums, check this thread.
Does a window pop up then disappear? It could be printing it in console then closing as soon as it hits the end of the code...
try to make your code like this:
#include <iostream>
#include <conio.h>
using namespase std;
int main()
{
cout << "helllo, world" << endl;
getch();
return 0;
}
You must set the environment so the eclipse can find the c++ compiler.
Go to Computer and right click Properties -> advanced system settings -> enviroment variables.
Scroll down in system variables and find the path (it is named so). Press edit and append in the path the value C:\MinGW\bin;C:\MinGW\msys\1.0\bin;. You will have something like C:\MinGW\bin;C:\MinGW\msys\1.0\bin;C:\programfiles........
Then start again the eclipse the problem should have been solved.