module Process

def get_process_info(handle)
  hash = Hash.new { |h, k| h[k] = [] }
  pe = PROCESSENTRY32.new
  pe[:dwSize] = pe.size
  if Process32First(handle, pe)
    hash[pe[:th32ProcessID]] = ProcessSnapInfo.new(
      pe[:th32ProcessID],
      pe[:cntThreads],
      pe[:th32ParentProcessID],
      pe[:pcPriClassBase],
      pe[:dwFlags],
      pe[:szExeFile].to_s
    )
  else
    if FFI.errno == ERROR_NO_MORE_FILES
      return hash
    else
      raise SystemCallError.new("Process32First", FFI.errno)
    end
  end
  while Process32Next(handle, pe)
    hash[pe[:th32ProcessID]] = ProcessSnapInfo.new(
      pe[:th32ProcessID],
      pe[:cntThreads],
      pe[:th32ParentProcessID],
      pe[:pcPriClassBase],
      pe[:dwFlags],
      pe[:szExeFile].to_s
    )
  end
  hash
end