Golang on windows. Trying to use
os.Open("%userprofile%\\myfile.txt") Getting file path not found and golang is not resolving %userprofile% to my C:\users\myusername folder.
4 Answers
To get a file handle, and make your program a little portable too, try
userprofile := os.Getenv("USERPROFILE") f, err := os.Open(path.Join(userprofile, "myfile.txt")) The os.Getenv() will read the environment variable and path.Join() will take care of properly constructing the path (so no need to do \\).
Instead of os.Getenv() you might also want to look at os.LookupEnv(). This will tell you if the environment variable you're looking for is empty or simply not existing. A good example of how you can use that to set default values can be found in this answer on SO.
Comments
Just written a package to do this. Feedback welcome
https://gitlab.com/stu-b-doo/windowspathenv/
fmt.Println(windowspathenv.Resolve("%USERPROFILE%/Documents")) // C:\Users\YourName\Documents 
Comments
userprofile := os.Getenv("USERPROFILE") os.Open(userprofile+"\\myfile.txt") Comments
Have a look at http://www.golangprograms.com/how-to-set-get-and-list-environment-variables.html
You can read the 'userprofile' environment value and and build the path before passing it to os.Open
1 Comment
SzakiLaci
Link is not pointing there any more.
%VAR%style variables you're using. It would be trivial to implement your own version, though.