在TCL中串联/附加字符串

Question

I am trying to append a file name to a project directory in TCL:

set filename hello
set currentPath "D:/TEMP/project name/subfolder/"
puts [append $currentPath $filename]

According to the docs all that is needed is a varName to which we are appending and a ?value which is getting appended to varName . Unfortunately when I run the above code I only get hello as output. How can I perform this simple task on TCL?

Answer 1

The problem is that you're using the variable value where you need the variable name . In Tcl (as opposed to some other languages), the $ means “read this variable now ” and that's meaning that you're giving a rather odd variable name to append . Try switching from:

puts [append $currentPath $filename]

to:

puts [append currentPath $filename]
# Be aware that this *updates* the currentPath variable

Also, if you're using this to make a filename, do consider using file join instead; it handles all sorts of tricky cases you're not currently aware of so that you don't ever need to become aware of them.

puts [file join $currentPath $filename]