当欲向接口中定义方法如下：
[id(1), helpstring("method SearchCust")] HRESULT SearchCust([in] BSTR bstrcustid,[out,retval] _Recordset **ptr);
由于用到_Recordset类型，所以必须
importlib("C:Program FilesCommon FilesSystemADOMSADO15.DLL");
于是整个idl文件应该改写为以下方式：
// FindCust.idl : IDL source for FindCust.dll
//
// This file will be processed by the MIDL tool to
// produce the type library (FindCust.tlb) and marshalling code.
import "oaidl.idl";
import "ocidl.idl";
[
uuid(B
version(1.0),
helpstring("FindCust 1.0 Type Library")
]
library FINDCUSTLib //Library给手动提前了
{
importlib("stdole32.tlb");
importlib("stdole2.tlb");
//MODIFY HERE
importlib("C:Program FilesCommon FilesSystemADOMSADO15.DLL");
[
object,
uuid(B
dual,
helpstring("ISearch Interface"),
pointer_default(unique)
]
interface ISearch : IDispatch
{
[id(1), helpstring("method SearchCust")] HRESULT SearchCust([in] BSTR bstrcustid,[out,retval] _Recordset **ptr);
};
[
uuid(B
helpstring("_ISearchEvents Interface")
]
dispinterface _ISearchEvents
{
properties:
methods:
};
[
uuid(B
helpstring("Search Class")
]
coclass Search
{
[default] interface ISearch;
[default, source] dispinterface _ISearchEvents;
};
};