what variant data type

Introduction to the Delphi Variant type (variant) (Flow vs. Variant types, functions commonly used for variant types)first, the variant types commonly used functions are described:Variant: One can have a variety of data types, you can also tell what

In the 85. In the variant of basic and LotusScript, I mentioned variant variants in basic-style languages. Variant types are often used in lotusscript for a variety of reasons.1. The return type of a function cannot be declared as an array, and can

BSTR, lpstr, lpwstr, cstring, variant, colevariant, _ variant_t, ccombstr, _ bstr_t visual c ++. net involves multiple programming methods such as ATL/ATL server, MFC, and hosting C ++. It is not only powerful but also widely used. In programming,

87. Let's talk about Variant and 87 variant.In the article Variant in 85. BASIC and LotusScript, I mentioned Variant in BASIC-style languages. Ing is often used in Lotus script for the following reasons. 1. The return type of the function cannot be

85. Variant and Lotus scriptvariant in BASIC and Lotus scriptOrigin Recently, I read back my Notes on Notes and found that in the Notes bugs category, there is almost no difference between the two numbers. 2. 'Type mismatch' occurs if an nested

This article Reprinted from: http://ygdljg.blog.163.com/blog/static/546010462008101191835269/ Http://www.vckbase.com/document/viewdoc? Id = 1096 Http://www.vckbase.com/document/viewdoc? Id = 1082 CW2A (BSTR)CW2A (_ bstr_t)CW2A (VARIANT. bstrVal)CW2A

Reference articlesHttp://blog.163.com/[email protected]/blog/static/16219623020107634935586/http://blog.csdn.net/dreamcs/article/details/7186633Http://blog.sina.com.cn/s/blog_6c3d32da0100ua13.htmlCOleVariant is the data type that the database is

The variant data type is defined in the file oaidl. IDL as follows: Struct tagvariant {Union {Struct _ tagvariant {Vartype VT;Word wreserved1;Word wreserved2;Word wreserved3;Union {Ulonglong ullval;/* vt_ui8 */Longlong llval;/* vt_i8 */Long lval;/*

Variant (variant) Variant types can theoretically store any type of data, which is why many people in Chinese call it "variants." It is strange for a programmer with a strongly typed language such as C + + to have a Variant (variant) of that type.

The basic usage of the variant in boost: Copy Code code as follows: typedef VARIANT VT; VT v = 1; v = ' 2 '; v = 12.32; The advantage of a variant is that the type can be erased, and the values of different types are