两个百思不得其解的错误，大虾指教！

S5933Device.obj : error LNK2001: unresolved external symbol
 \"public: virtual long __thiscall S5933Device::InternalDeviceControl
(class KIrp)\" (?InternalDeviceControl@S5933Device@@UAEJVKIrp@@@Z)
  
S5933Device.obj : error LNK2001: unresolved external symbol
 \"public: virtual long __thiscall S5933Device::FlushBuffers
(class KIrp)\" (?FlushBuffers@S5933Device@@UAEJVKIrp@@@Z)
Kirp中没那两个成员呀，而欧的代码中也没有呀