怎样转换dll文件调用?(20分)

怎样将下面的dll调用转换为delphi中的dll文件调用
FUNCTION long GetPerAcctInfo (string MedCardNo,string OperatorNo,string HospitalNo,string SIInstNo,REF int AppCode,REF string DataBuffer,REF int BufLen ) LIBRARY "DBLIB.dll"

FUNCTION GetPerAcctInfo (MedCardNo,OperatorNo,HospitalNo,SIInstNo:string;var AppCode:integer;var DataBuffer:string;var BufLen:int):integer;external 'DBLIB.dll'