Simple example for building C Shared Libraries with Go

greet.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "libhello.h"

int main(int argc, char **argv) {
    char *name, *greeting;
    if (argc < 2) {
        fprintf(stderr, "missing name\n");
        return 1;
    }

    name = strdup(argv[1]);
    greeting = Hello(name);
    free(name);

    printf("%s\n", greeting);
    return 0;
}

greet.py

from __future__ import print_function

import ctypes
from os.path import abspath, dirname, join
import sys


if __name__ == '__main__':
    if len(sys.argv) < 2:
        print('missing name', file=sys.stderr)
        sys.exit(1)
    name = sys.argv[1]

    lib_path = abspath(join(dirname(__file__), 'libhello.so'))
    lib = ctypes.CDLL(lib_path)

    lib.Hello.argtypes = [ctypes.c_char_p]
    lib.Hello.restype = ctypes.c_char_p
    greeting = lib.Hello(name.encode('utf-8'))
    print(greeting.decode('utf-8'))

hello.go

package main

import "C"

//export Hello
func Hello(name *C.char) *C.char {
	return C.CString("Hello " + C.GoString(name))
}

func main() {}

• http://snowsyn.net/2016/09/11/creating-shared-libraries-in-go/
• https://github.com/vladimirvivien/go-cshared-examples
• https://github.com/jima80525/ctypes_example