如何释放封装在 VARIANT 中的 IDL 用户定义结构的成员（即 BSTR、SAFEARRAY、VARIANT）？
我有一个在 IDL 中定义的结构。该结构具有以下成员：
{
BSTR m_sFirst;
BSTR m_sSecond;
VARIANT m_vChildStruct; //This member encapsulate a sub structure
SAFEARRAY __RPC_FAR * m_saArray;
}CustomINFO;
我使用 CoTaskMemAlloc 为结构分配内存并将其封装在 Variant 中，如下所示：
vV->vt = VT_RECORD;
vV->pvRecord = pStruct; //Pointer of sturct
vV->pRecInfo = pRI; //RecordInfo Interface
调用 VariantClear 来释放结构及其成员的内存是否足够？ 是否也会发布IRecordInfo接口？
或者我必须手动获取封装的结构并自己释放每个成员，然后使用 CoTaskMemFree 释放结构。
感
谢皮卡罗·德·沃西奥
I have a structure defined in IDL. This structure has following members:
{
BSTR m_sFirst;
BSTR m_sSecond;
VARIANT m_vChildStruct; //This member encapsulate a sub structure
SAFEARRAY __RPC_FAR * m_saArray;
}CustomINFO;
I am allocating the memory for the structs using CoTaskMemAlloc and encapsulating it in Variant as follows:
vV->vt = VT_RECORD;
vV->pvRecord = pStruct; //Pointer of sturct
vV->pRecInfo = pRI; //RecordInfo Interface
Is it enough to call VariantClear to deallocate the memory of struct and its members?
Will it also release the IRecordInfo interface?
Or i have to manually get the encapsulated struct and deallocate each member myself and then use CoTaskMemFree to deallocate sturct.
Thanks
Picaro De Vosio
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VariantClear将调用IRecordInfo::Clear，它释放结构成员持有的内存，但据说不会释放结构本身（这就是为什么你不能正确地返回[out] VARIANT中的结构体）。 IRecordInfo 也应该被释放。（“应该”的意思是“否则，许多现有代码将被破坏/被破坏”）。
更多信息请参见：http://vcfaq.mvps.org/com/4.htm
VariantClearwill callIRecordInfo::Clear, which releases the memory held by members of the struct, but supposedly doesn't release the struct itself (that's why you can't correctly return a struct in an[out] VARIANT). the IRecordInfo should be released, too.("should" means "otherwise, a lot of existing code would break/be broken").
Some more info here: http://vcfaq.mvps.org/com/4.htm