# go-ffi

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# go-ffi

The ffi package wraps the libffi C library (and dlopen/dlclose) to provide an easy way to call arbitrary functions from Go.

## Installation

ffi is go-get-able:

\$ go get bitbucket.org/binet/go-ffi/pkg/ffi


## Example

// dl-open a library: here, libm on macosx
lib, err := ffi.NewLibrary("libm.dylib")
handle_err(err)

// get a handle to 'cos', with the correct signature
cos, err := lib.Fct("cos", ffi.Double, []Type{ffi.Double})
handle_err(err)

// call it
out := cos(0.).Float()
println("cos(0.)=", out)

err = lib.Close()
handle_err(err)


## Limitations/TODO

• no check is performed b/w what the user provides as a signature and the "real" signature
• it would be handy to just provide the name of the library (ie: "m") instead of its filename (ie: "libm.dylib")
• it would be handy to use some tool to automatically infer the "real" function signature
• it would be handy to also handle structs
• better handling of types with no direct equivalent in go (short,void,...)

## Documentation

http://go.pkgdoc.org/bitbucket.org/binet/go-ffi/pkg/ffi

# Recent activity

Commits by Sebastien Binet were pushed to binet/go-ffi

c75d219 - added some more tests. TODO/FIXME: how to handle functions which return pointers to some type? (we'd need to discover that type, somehow...)

Commits by Sebastien Binet were pushed to binet/go-ffi

d749543 - added a test for int-args

Commits by Sebastien Binet were pushed to binet/go-ffi

e152155 - handle some more types

Commits by Sebastien Binet were pushed to binet/go-ffi

bc34897 - fix doc: call lib.Close()

Commits by Sebastien Binet were pushed to binet/go-ffi

2bb1c31 - fixups + tests for math
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