请问_variant_t的问题 MSDN里面描述的很少。请问其含义和使用看哪方面的书谢谢高手指点！ 解决方案 » 免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货 MSDN挺详细 C++ Language Reference _variant_t ClassSee AlsoCompiler COM Support Class OverviewRequirementsHeader: comutil.hLib: comsupp.libMicrosoft SpecificA _variant_t object encapsulates the VARIANT data type. The class manages resource allocation and deallocation and makes function calls to VariantInit and VariantClear as appropriate.Construction_variant_t Constructs a _variant_t object. OperationsAttach Attaches a VARIANT object into the _variant_t object. Clear Clears the encapsulated VARIANT object. ChangeType Changes the type of the _variant_t object to the indicated VARTYPE. Detach Detaches the encapsulated VARIANT object from this _variant_t object. SetString Assigns a string to this _variant_t object. Operatorsoperator = Assigns a new value to an existing _variant_t object. operator ==, != Compare two _variant_t objects for equality or inequality. Extractors Extract data from the encapsulated VARIANT object. END Microsoft SpecificRequirementsHeader: comutil.hLib: comsupp.libSee AlsoCompiler COM Support Class Overview--------------------------------------------------------------------------------Send feedback on this topic to Microsoft© Microsoft Corporation. All rights reserved. the VARIANT data type怎么理解呢 VARIANT 数据类型在Windows SDK文档中有详细描述 http://www.china-askpro.com/msg23/qa34.shtml GDI+ 画线扩大图片后坐标偏离的问题怎么解决 帮忙一下 你们也可以挑战一下这个问题 求教多线程程序界面无响应的问题 ftp上传文件问题。 类中容器成员的问题 【】只要点下就送分！ 数据库问题 VC调试问题！！！（急！！！） 如何方便获取HTML文件的文本内容 用VC做串并口通讯的问题 关于_beginthreadex modem问题：如何向modem发送AT command，并接收其返回值
Compiler COM Support Class Overview
Requirements
Header: comutil.hLib: comsupp.lib
Microsoft SpecificA _variant_t object encapsulates the VARIANT data type. The class manages resource allocation and deallocation and makes function calls to VariantInit and VariantClear as appropriate.Construction_variant_t Constructs a _variant_t object. OperationsAttach Attaches a VARIANT object into the _variant_t object.
Clear Clears the encapsulated VARIANT object.
ChangeType Changes the type of the _variant_t object to the indicated VARTYPE.
Detach Detaches the encapsulated VARIANT object from this _variant_t object.
SetString Assigns a string to this _variant_t object. Operatorsoperator = Assigns a new value to an existing _variant_t object.
operator ==, != Compare two _variant_t objects for equality or inequality.
Extractors Extract data from the encapsulated VARIANT object. END Microsoft SpecificRequirements
Header: comutil.hLib: comsupp.libSee Also
Compiler COM Support Class Overview--------------------------------------------------------------------------------Send feedback on this topic to Microsoft© Microsoft Corporation. All rights reserved.
怎么理解呢