Ccall problem while calling fortran

General Usage
3

The error message is telling you.

LoadError: syntax: ccall argument types must be a tuple; try "(T,)" around c:\Users\<user>\Desktop\recycling_bin\module\julia\square.jl:7

Although your function only has one argument, the Julia interface requires the argument typess to be a tuple. So in this case you need a one-tuple

ccall(("function_name", "dll_to_link_to"),
       Float64,
       (argument_type,), argument)

instead of

ccall(("function_name", "dll_to_link_to"),
       Float64,
       (argument_type), argument)

(argument_type) is not a tuple, (argument_type,) is a tuple. EDIT: In case it’s not obvious, there’s an extra comma in the expression that is a tuple.

Sorry I can’t help with your other questions.

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