From "int cfunc(char *data,int *num) " how can I get the value of 'num' in ruby/dl

Ruby
1

I have a question about “ruby/dl”.

I define the function in “ruby/dl” like the belows

require ‘dl’
LIB=DL.dlopen(‘libfunc.dll’)
cfunc=LIB[‘cfunc’,‘ISi’] # int cfunc(char *data,int *num)

After typing in irb, I typed them like this.

len=DL.malloc(DL.sizeof(“I”))
err=cfunc.call(“hello”,len)

But, error message is displayed like the belows.

“TypeError: can’t convert DL::PtrData into Integer”

I’m not sure how to solve the problem.

Please let me know the reason and solutions for novice like me.

Then, Thank you in advance.