gistfile1.txt

local Error = require('core').Error
local ffi = require('ffi')
local fmt = require('string').format

ffi.cdef[[
  typedef unsigned long MSIHANDLE;
  typedef unsigned int UINT, DWORD;
  typedef char CHAR;
  typedef CHAR *NPSTR, *LPSTR, *PSTR;
  typedef const CHAR *LPCSTR, *LPTSTR, *LPCTSTR, *PCSTR;

  enum {
    ERROR_SUCCESS = 0L,
    ERROR_MORE_DATA = 234L
  };

  UINT MsiOpenPackageA(const char* szPackagePath, MSIHANDLE *hProduct);
  UINT MsiGetProductPropertyA(MSIHANDLE hProduct,  LPCTSTR szProperty, LPTSTR lpValueBuf, DWORD *pcchValueBuf);
  UINT MsiCloseHandle(MSIHANDLE hAny);
]]

local msilib = ffi.load("Msi")
local msi_path = 'out.msi'

local phProduct = ffi.new('MSIHANDLE[1]')
local ret = msilib.MsiOpenPackageA(msi_path, phProduct);
if ret ~= ffi.C.ERROR_SUCCESS then
  error(ret)
end