求助，strcpy_s( )有点不明白

在vc2005有  #define deptNo_LEN     2 + 1;
            SQLCHAR     deptNo[deptNo_LEN ];
            strcpy_s(deptNo,deptNo_LEN, "D5");
 结果报错，错误信息是 error C2664: 'errno_t strcpy_s(char *,rsize_t,const char *)' : cannot convert parameter 1 from 'SQLCHAR [3]' to 'char *'
1>        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

是怎么回事呢，好像是跟vc2005默认unicode编码有关吧？？