How does VB.NET call Window API?

This article mainly introduces how VB.NET calls Window API, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The way VB.NET calls Window API is similar to that in VB6, where you must use the declare statement to declare a reference to an external program in the dynamic link library (DLL). Let's make an example of the call and call the GetUserName function in advapi32.dll to get the user name of the system login.

Imports System

Imports System.Text

Imports Microsoft.VisualBasic

Public Class Form3Class Form3

Declare Function GetUsername () Function GetUsername Lib "advapi32.dll" Alias _

"GetUserNameA" (ByVal lpbuffer As String, ByRef nSize As Integer) _

As Integer

Private Sub Button3_Click () Sub Button3_Click (ByVal sender As System.Object

ByVal e As System.EventArgs) Handles Button3.Click

Dim RV As Integer

Dim UserName As String

Dim Buffer As String

Buffer = New String (CChar ("), 25)

RV = GetUsername (Buffer, 25)

UserName = Microsoft.VisualBasic.Left (Buffer, InStr (Buffer, Chr (0))-1)

MsgBox (UserName)

End Sub

End Class

Of course, DotNet FrameWork 2.0 already provides a rich set of class libraries. We can get almost all the functions without having to call Window API with VB.NET, especially after Microsoft's operating system is already set up on. Net FrameWork.

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