function getserial()
local ffi = require('ffi')
ffi.cdef[[
int __stdcall GetVolumeInformationA(
const char* lpRootPathName,
char* lpVolumeNameBuffer,
uint32_t nVolumeNameSize,
uint32_t* lpVolumeSerialNumber,
uint32_t* lpMaximumComponentLength,
uint32_t*...