Go生成库给C/C++

Windows

• main.go

package main

/*
#include <stdlib.h>
*/
import "C"
import (
	"net"
	"unsafe"
)

//export GetMacAddr
func GetMacAddr(ipaddr *C.char) (addr *C.char) {
	var netIP net.IP
	ip := C.GoString(ipaddr)
	if netIP = net.ParseIP(ip); netIP == nil {
		return
	}

	interfaces, err := net.Interfaces()
	if err != nil || len(interfaces) == 0 {
		return
	}

	for _, ifs := range interfaces {
		addrs, err := ifs.Addrs()
		if err != nil || ifs.HardwareAddr == nil {
			continue
		}
		if addr == nil && len(ifs.HardwareAddr) > 0 {
			addr = C.CString(ifs.HardwareAddr.String())
		}
		for _, a := range addrs {
			_, ipNet, err := net.ParseCIDR(a.String())
			if err != nil {
				continue
			}
			if ipNet.Contains(netIP) {
				C.free(unsafe.Pointer(addr))
				return C.CString(ifs.HardwareAddr.String())
			}
		}
	}
	return
}

//export FreeCGOPtr
func FreeCGOPtr(p *C.char) {
	C.free(unsafe.Pointer(p))
}

func main() {}

go build -ldflags "-s -w" -buildmode=c-shared -o mac_addr.dll main.go

生成 mac_addr.dll和mac_addr.h, 然后编写def文件

• mac_addr.def

EXPORTS
	GetMacAddr

通过def文件生成lib文件

lib.exe /machine:X64 /def:mac_addr.def

这时候会得到 mac_addr.lib, mac_addr.dll, mac_addr.h三个文件

Linux

go build -ldflags "-w -s" -buildmode=c-archive -o mac_addr.a main.go

生成 mac_addr.a和mac_addr.h

gcc main.c -O3 mac_addr.a -lpthread