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This article mainly shows you "how to use StructLayout in VB.NET", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "how to use StructLayout in VB.NET" this article.

The main function of VB.NET programming language is to help developers create a powerful and stable development environment. The VB.NET StructLayout feature allows us to control how the elements of the Structure statement block are arranged in memory and how the runtime arranges them when they are passed to the external DLL.

The members of the Visual Basic structure are arranged in memory in the order in which they appear in the source code, although the compiler is free to insert fill bytes to arrange these members so that 16-bit values are aligned with subboundaries and 32-bit values are aligned with double-word boundaries.

Use the performance provided by this VB.NET StructLayout arrangement (uncompressed layout).

The user-defined structure in Visual Basic 6 is uncompressed, and we cannot change this default setting. This setting can be changed in VB.NET, and the position of each structure member can be precisely controlled by the System.Runtime.InteropServices.StructLayout feature. The allowed values for System.Runtime.InteropServices.StructLayout are StructLayout.Auto StructLayout.Sequential StructLayout.Explicit.

Imports System.Runtime.

InteropServices

_

Structure test

...

End Structure

Three kinds of StructLayout features are supported.

Add fields: CharSet, Pack, Size.

CharSet defines how string members in a structure are arranged when the structure is passed to DLL. It can be Unicode, Ansi, or Auto.

The default is Auto, which means that strings are arranged by Unicode strings in WIN NT/2000/XP and by ANSI strings in WIN 95/98/Me.

Pack defines the encapsulation size of the structure. Can be 1, 2, 4, 8, 16, 32, 64, 128, or a special value of 0. A special value of 0 indicates the default compression size of the current operating platform.

Imports System.Runtime.

InteropServices

_

Structure test

...

End Structure

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