Eclipse Community Forums: C / C++ IDE (CDT) » Eclipse Input Output Redirection with

Help

Home

Home » Language IDEs » C / C++ IDE (CDT) » Eclipse Input Output Redirection with < and >

Show: Today's Messages :: Show Polls :: Message Navigator

Eclipse Input Output Redirection with < and > [message #1781568]

Thu, 08 February 2018 18:44

Brian Chu

Messages: 3
Registered: February 2018

Junior Member

So in the terminal, I can run my program with

./letter --stack -b ship -e shot -c --output W < input.txt > output.txt

How do I achieve the same functionality in Eclipse? I've figured out how to do --stack -b ship -e shot -c --output W by going to the arguments tab under Run configuration.

I've looked online and seen a lot of posts about using the Common tab to input and output redirection but I can't get it working. When I check only the input file, it doesn't work and the Debug perspective shows it's stuck somewhere trying to read from a stream. When I check allocate console and input file, then it gets stuck on user input (aka I can manually type stuff) in the console.

So how do I get < input.txt and by extension > output.txt working?

Report message to a moderator

Re: Eclipse Input Output Redirection with < and > [message #1781590 is a reply to message #1781568]

Fri, 09 February 2018 04:20

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

Eclipse launches the command as a new process without using a shell.
You probably should execute a shell command that then executes your program
Under Linux, the following run configuration (note the command and arguments are in separate tabs):

/usr/bin/bash -c "pwd; echo 'pstree -a -s $$' > tmp;  bash -p < tmp"

produces

/home/dvavra/proj/HCP-FANN
systemd --switched-root --system --deserialize 23
  └─lightdm
      └─lightdm --session-child 12 19
          └─sh /etc/xdg/xfce4/xinitrc -- vt
              └─xfce4-session
                  └─xfce4-panel --display :0.0 --sm-client-id 26f5d9e4b-868b-48f5-a436-a94ab1f73c5b
                      └─eclipse
                          └─java -Dosgi.requiredJavaVersion=1.8 -Dosgi.instance.area.default=@user.home/eclipse-workspace ...
                              └─bash -c pwd; echo 'pstree -a -s $$' > tmp;  bash -p < tmp
                                  └─bash -p
                                      └─pstree -a -s 28855

Note that the first bash command (shown after java) is executed directly.
This double use of bash is only for illustration.
Executing bash -c 'pstree -s $$' causes the invocation of bash to vanish.

systemd --switched-root --system --deserialize 23
  └─lightdm
      └─lightdm --session-child 12 19
          └─sh /etc/xdg/xfce4/xinitrc -- vt
              └─xfce4-session
                  └─xfce4-panel --display :0.0 --sm-client-id 26f5d9e4b-868b-48f5-a436-a94ab1f73c5b
                      └─eclipse
                          └─java -Dosgi.requiredJavaVersion=1.8 -Dosgi.instance.area.default=@user.home/eclipse-workspace ...
                              └─pstree -a -s 29210

Under Windows you should execute cmd.exe /c "your command"

[Updated on: Fri, 09 February 2018 04:23]

Report message to a moderator

Re: Eclipse Input Output Redirection with < and > [message #1783513 is a reply to message #1781590]

Tue, 13 March 2018 18:38

Brian Chu

Messages: 3
Registered: February 2018

Junior Member

How do I do this within eclipse? Do I have to be doing this in terminal? Starting a new project and very confused. If it's too complicated, just let me know and I'll switch to Visual Studio. Is it even possible to do this within eclipse? Every IDE I've seen allows for io redirection, but I can't find any documentation or anything within eclipse that supports this. Also I'm very unfamiliar with shell...

[Updated on: Tue, 13 March 2018 18:43]

Report message to a moderator

Re: Eclipse Input Output Redirection with < and > [message #1783547 is a reply to message #1783513]

Wed, 14 March 2018 03:33

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

Sorry, executing a single shell command seems easier to me.
It also allows execution of multiple commands in a launch.

Eclipse wants to insert itself as the input and output streams
but you can also override the input and output streams in the Common tab of a launch configuration dialog
http://help.eclipse.org/oxygen/index.jsp?topic=%2Forg.eclipse.cdt.doc.user%2Ftasks%2Fcdt_o_run_config.htm

There doesn't seem to be any documentation for it though it seems to be available since at least Kepler.

Report message to a moderator

Previous Topic:	Unexpected flash start address
Next Topic:	Unable to create variable object

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Sun Jan 26 03:21:33 GMT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter