说明：  OEP是每个PE文件读取时的起始地址，该程序给出两种方法来读取OEP，一种是直接从PE文件读取；另一种是将PE映射到内存中来读取。
(OEP each PE file read at the opening address, the program gives two ways to read OEP. A PE is directly from the document read. Another is to PE Maps memory to read.)