c++解析eml，如何保存附件

eml已经解析了一大部分了，现在附件的文件名也已经get到了，就差如何保存附件文件，现在我贴出获取附件名的代码，求高手指导。
IBodyParts* pAttachments;
IBodyPart* pAttach;
BSTR pAttachName;

imsgptr->get_Attachments(&pAttachments);//获得附件文件名
 long numAttachments;
 pAttachments->get_Count(&numAttachments);

 for( long i = 1; i <= numAttachments; i++ )
{
    pAttachments->get_Item(i, &pAttach);

    pAttach->get_FileName(&pAttachName);
    _bstr_t bAttachments(pAttachName);
    printf("Attachment:%s\n", WcharToChar(bAttachments));
}

直接文件另存为就可以了。