Delphi 调用C++调用Dll问题

C++ Dll里面定义的函数头/*COMMON_LIB_API unsigned long stdcall cmm_DESDecrypt( unsigned char *Key,int16 KeyLen,
unsigned char Source, unsigned long SrcLen,
unsigned char *result,
__int16 PadMode /
= COMMON_LIB_DES_PAD_00*/
请问Delphi 里面要怎么定义函数头