com variant

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,

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

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

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 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

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

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

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

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, //

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