Golang call C function in dynamic library using dlopen

go-call-c-lib

package cv

import "C"
import (
	"log"

	"github.com/rainycape/dl"
)

// Capture ...
func Capture(input string, len int) (string, error) {
	// TODO: this is a test function to Capture
	lib, err := dl.Open("dist/clib/libci.so", 0)
	if err != nil {
		log.Fatalln(err)
		return "", err
	}
	defer lib.Close()

	var capture func(s *C.char, c C.int) *C.char
	err = lib.Sym("capture", &capture)
	if err != nil {
		log.Fatalln(err)
		return "", err
	}

	ret := capture(C.CString(input), C.int(len))
	return C.GoString(ret), nil
}