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// +build windows
package xid
import (
"fmt"
"syscall"
"unsafe"
)
func readPlatformMachineID() (string, error) {
// source: https://github.com/shirou/gopsutil/blob/master/host/host_syscall.go
var h syscall.Handle
err := syscall.RegOpenKeyEx(syscall.HKEY_LOCAL_MACHINE, syscall.StringToUTF16Ptr(`SOFTWARE\Microsoft\Cryptography`), 0, syscall.KEY_READ|syscall.KEY_WOW64_64KEY, &h)
if err != nil {
return "", err
}
defer syscall.RegCloseKey(h)
const syscallRegBufLen = 74 // len(`{`) + len(`abcdefgh-1234-456789012-123345456671` * 2) + len(`}`) // 2 == bytes/UTF16
const uuidLen = 36
var regBuf [syscallRegBufLen]uint16
bufLen := uint32(syscallRegBufLen)
var valType uint32
err = syscall.RegQueryValueEx(h, syscall.StringToUTF16Ptr(`MachineGuid`), nil, &valType, (*byte)(unsafe.Pointer(®Buf[0])), &bufLen)
if err != nil {
return "", err
}
hostID := syscall.UTF16ToString(regBuf[:])
hostIDLen := len(hostID)
if hostIDLen != uuidLen {
return "", fmt.Errorf("HostID incorrect: %q\n", hostID)
}
return hostID, nil
}
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