> Well, under the covers the str function applies the java "toString" > method to any passed in object and hence the result could for some > reason be different to the original String object passed in. I think > this could occur if the object subclasses String, but has a different > representation (i.e a different toString method). > > Are you able to post what s contains when this happens? > You could try printing s in your calling function and then also in the > defmethod, e.g; > > (defmethod t-str String [s] (prn "cls:" (class s) "s:" s "chars:" (vec s)))) > > Maybe that'll shed some light?
I thought I sent this to the list, but I think I just sent it to a
single person, so I'm trying again...
Ok, here's a stripped down set of code that has the problem. It does
require that erlang be installed with java support. I couldn't figure
out a way to duplicate the problem without it, unfortunately.
To test this out, first start erlang like this:
erl -setcookie cookie -sname e...@localhost
Then, run the attached demo.clj. Once that's started (it won't print
anything, so just give it a sec to get running), run the following
from the erlang REPL:
{ echo, e...@localhost } ! { self(), "hi there" }.
and then, after the demo.clj has exited,
(fun() -> receive X -> X after 0 -> nil end end)().
As the code is submitted, you will get a reply that looks like
<<172,237,0,5,117,114,0,2,91,66,172,243,23,248,6,8,84,224,
2,0,0,120,112,0,0,0,8,104,105,...>>
If you replace the (let [ inside s ...]) with (let [ inside (str s)
...]) and rerun the test, you will get the string "hi there", as a
binary. On the clojure side, the following is printed
with [ inside s ]:
I was given a class java.lang.String
Chars are [\h \i \space \t \h \e \r \e]
Given string is 'hi there'
Bytes length is 8
OtpBinary size is 35
with [ inside (str s) ]
I was given a class java.lang.String
Chars are [\h \i \space \t \h \e \r \e]
Given string is 'hi there'
Bytes length is 8
OtpBinary size is 8
So, I'm hoping this gives somebody an idea, because I'm stumped.
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demo.clj
Description: Binary data
