Go Create GUID

guid.go

package main

import (
	"fmt"
	"strings"
	"syscall"
	"unsafe"
)

var _ unsafe.Pointer

var (
	modwinspool     = syscall.NewLazyDLL("Ole32.dll")
	CoCreateGuid    = modwinspool.NewProc("CoCreateGuid")
	StringFromGUID2 = modwinspool.NewProc("StringFromGUID2")
)

type GUID struct {
	Data1 uint32
	Data2 uint16
	Data3 uint16
	Data4 [8]byte
}

func main() {

	guid := &GUID{}
	err := GetGuid(guid)
	if err != nil {
		fmt.Println(err)
	}

	guidString, err := GuidToString(guid)
	if err != nil {
		fmt.Println(err)
	}

	fmt.Println(guidString)
}

func GetGuid(pguid *GUID) (err error) {
	r1, _, e1 := syscall.Syscall(CoCreateGuid.Addr(), 1, uintptr(unsafe.Pointer(pguid)), 0, 0)
	if r1 != 0 {
		if e1 != 0 {
			err = error(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	return
}

func GuidToString(pguid *GUID) (guidStr string, err error) {
	b := make([]uint16, 39)
	n := uint32(len(b))
	r1, _, e1 := syscall.Syscall(StringFromGUID2.Addr(), 3, uintptr(unsafe.Pointer(pguid)), uintptr(unsafe.Pointer(&b[0])), uintptr(n))
	if r1 != 0 {
		if e1 != 0 {
			err = error(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	guidStr = syscall.UTF16ToString(b)
	guidStr = strings.TrimRight(guidStr, "}")
	guidStr = strings.TrimLeft(guidStr, "{")
	return
}