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About the configuration file in package

Hi !
I’m writing a package that needs to read a configuration file .
I use install(FILES xxx.yaml DESTINATION share/${PROJECT_NAME}) to copy the configuration file to the path : /shr/package-name

But i have no good way to get the right path where the file stores and then read it

i’m using the absolute path to read the file now but i want to make it relative so the package can be used in different environment .

looking forward to some suggestions !

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edit: posted at

sorry to post it here and thank you !