oracle 调用delphi的dll

[rgx88981261]

我在delphi中创建了一个动态库Project1.dll,
然后在oracle中创建library
create or replace library MYLIB
as 'C:\oracle\ora92\bin\Project1.dll';
这个可以执行成功。
但是我在PLSQL Developer执行下面这个创建函数

CREATE OR REPLACE FUNCTION mytest1(a DOUBLE PRECISION,b DOUBLE PRECISION) RETURN DOUBLE PRECISION AS
LANGUAGE C NAME "dlltest"
LIBRARY MYLIB
PARAMETERS (a DOUBLE,b DOUBLE,
RETURN DOUBLE );
end;
/
总是报Warning: Procedure created with compilation errors这个错,