Source file src/github.com/rs/xid/hostid_windows.go

Documentation: github.com/rs/xid

     1  // +build windows
     2  
     3  package xid
     4  
     5  import (
     6  	"fmt"
     7  	"syscall"
     8  	"unsafe"
     9  )
    10  
    11  func readPlatformMachineID() (string, error) {
    12  	// source: https://github.com/shirou/gopsutil/blob/master/host/host_syscall.go
    13  	var h syscall.Handle
    14  	err := syscall.RegOpenKeyEx(syscall.HKEY_LOCAL_MACHINE, syscall.StringToUTF16Ptr(`SOFTWARE\Microsoft\Cryptography`), 0, syscall.KEY_READ|syscall.KEY_WOW64_64KEY, &h)
    15  	if err != nil {
    16  		return "", err
    17  	}
    18  	defer syscall.RegCloseKey(h)
    19  
    20  	const syscallRegBufLen = 74 // len(`{`) + len(`abcdefgh-1234-456789012-123345456671` * 2) + len(`}`) // 2 == bytes/UTF16
    21  	const uuidLen = 36
    22  
    23  	var regBuf [syscallRegBufLen]uint16
    24  	bufLen := uint32(syscallRegBufLen)
    25  	var valType uint32
    26  	err = syscall.RegQueryValueEx(h, syscall.StringToUTF16Ptr(`MachineGuid`), nil, &valType, (*byte)(unsafe.Pointer(&regBuf[0])), &bufLen)
    27  	if err != nil {
    28  		return "", err
    29  	}
    30  
    31  	hostID := syscall.UTF16ToString(regBuf[:])
    32  	hostIDLen := len(hostID)
    33  	if hostIDLen != uuidLen {
    34  		return "", fmt.Errorf("HostID incorrect: %q\n", hostID)
    35  	}
    36  
    37  	return hostID, nil
    38  }
    39  

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