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Read data from txt file on c++

asked 2015-04-15 04:41:12 -0500

charles gravatar image

updated 2015-04-15 06:14:35 -0500

Hi everybody,

I have a package with a c++ source file (source.cpp) that reads data from a txt (filename.txt). I compile the package through "catkin_make package" and everything goes fine. What should I do to make the executable to find the txt file when I run "rosrun package executable"?

Edit: In the CMakeLists.txt I do "add_executable (executable source.cpp)". The filename.txt is in the same directory as source.cpp. How do I add the file name?

Thank you.

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answered 2015-04-15 07:15:45 -0500

Wolf gravatar image

Alternatively to @aak2166 answer you can use the ros::package API:

ros::package::getPath('PKG_NAME') should give you the package path, where you can append your relative resource path to get a full path.

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answered 2015-04-15 07:11:03 -0500

aak2166 gravatar image

updated 2015-04-15 07:21:17 -0500

In your C++ source code you can make a call to the parameter server, where the path to that file is stored.

In your code, with Node Handle nh write:

std::string fpath;
nh.getParam("~private_param_name", fpath);

And now in your launch file add the line (I believe this is how it works, I've never done it this way, you might need to experiment a bit with this):

<node ...>
    <param name="private_param_name" command="'$(find your_package)/src/your_text_file.txt'"
</node>

Or if you want to run from the command line

rosrun your_package_name your_executable _private_param_name:="path_to_your_package/src/your_text_file.txt"

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answered 2015-04-15 05:30:07 -0500

ROSkinect gravatar image

updated 2015-04-15 05:30:41 -0500

I don't know how you start your source.cpp ! but in your program you have to add the directory where your file is or at least its name if there are in the same directory.

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Asked: 2015-04-15 04:41:12 -0500

Seen: 2,212 times

Last updated: Apr 15 '15