variant com

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Various data types BSTR, lpstr, lpwstr, cstring, variant, colevariant, _ variant_t, and ccombstr encountered in VC ++

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,

VARIANT, _variant_t, CComVariant, COleVariant, cdbvariant

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

Discussion on how to convert the BSTR, _ bstr_r, VARIANT, _ variant_t. VARIANT Type with CString

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

Delphi writing COM + component knowledge and examples

first, the basic knowledge of COM components introduction: 1, what is COM COM is a Microsoft set up a component of the specification, the purpose is to achieve the reuse of components, whether you are in C, DELPHI, VB what language to write, as

Com data type BSTR, Variant

Com features language-neutral and hardware-neutral. Obviously, it requires a text data type that is language-neutral and hardware-neutral.Olechar and BSTR are used for this purpose.Olechar: The character type used by com on the target operating

Variant, colevariant, and _ variant_t

In Ole, ActiveX, and COM, the variant data type provides a very effective mechanism because it includes both the data itself and the data type, therefore, it can realize various automatic data transmission. Let's take a look at a simplified version

Use the variant type to pass array data in the com Method

In the com method, array data can be transmitted using the variant type and processed using safearray in VC ++. The following example shows the input and output arrays. 1. Input an array to comStdmethodimp ctestcom1: vb2vc (variant buffer){Long dim

C ++ uses variant for two-dimensional array operations

Variant is one of the important parameter variables for communication between COM components. It can accommodate a variety of different types, such as short, long, and double, including various pointers and arrays. Mutual calling between components

Record, packed record, and Variant record

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> // The integer type is exactly four bytes, And the integer int type is one byte, but the memory in Windows is 4 bytes allocated, //

Orange Temptation and Warcraft thief variant

Jiangmin 7.27 virus Broadcast English Name: Trojan/chifrax.ol Chinese name: "Orange Temptation" variant ol Virus Length: 288105 bytes Virus type: Trojan Horse Danger level: ★ Impact Platform: Win 9x/me/nt/2000/xp/2003 MD5 Check: 5f6eb2e5f76fb2

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