函数传给我一个LPDISPATCH的参数，怎么能把它转化为它的原始类型？

[javacflow]

怎么使用这样的参数？

[_foo]

通常可以调用QueryInterface来查询别的接口。

[modena]

比如：
IHTMLDocument2* pDocument = NULL;

ASSERT(pDisp != NULL );

pDisp->QueryInterface(IID_IHTMLDocument2, ( LPVOID* )&pDocument);
ASSERT(pDocument);

[itmaster]

IUnknown::QueryInterface

HRESULT IUnknown::QueryInterface (REFIID riid, LPVOID FAR *ppvObj);


Retrieves the address of a specified interface on a particular object so that an application can query an object to determine what interfaces it supports.

· Returns NOERROR if successful, or one of these error values:

CO_E_OBJNOTCONNECTED
E_NOINTERFACE
E_OUTOFMEMORY
E_INVALIDARG
E_UNEXPECTED
REGDB_E_IIDNOTREG


riid

[in] Interface identifier of the interface to be retrieved.


ppvObj

[out] Address of a variable that receives the address of the specified interface on the object. If the interface specified in riid is not supported by the object, the function returns E_NOINTERFACE. All errors set *ppvObj to NULL.

[itmaster]

http://www.csdn.net/develop/article/18/18409.shtm