main.frm

很好的教程原代码！

VERSION 5.00
Begin VB.Form Main 
   Caption         =   "Form1"
   ClientHeight    =   3345
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4905
   LinkTopic       =   "Form1"
   ScaleHeight     =   3345
   ScaleWidth      =   4905
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command2 
      Caption         =   "设置计算机名称"
      Height          =   375
      Left            =   480
      TabIndex        =   3
      Top             =   1080
      Width           =   1695
   End
   Begin VB.TextBox Text2 
      Height          =   375
      Left            =   2280
      TabIndex        =   2
      Text            =   "Text1"
      Top             =   1080
      Width           =   2175
   End
   Begin VB.CommandButton Command1 
      Caption         =   "获取计算机名称"
      Height          =   375
      Left            =   480
      TabIndex        =   1
      Top             =   480
      Width           =   1695
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   2280
      TabIndex        =   0
      Text            =   "Text1"
      Top             =   480
      Width           =   2175
   End
End
Attribute VB_Name = "Main"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

' 获取计算机名称的API
Private Declare Function GetComputerName Lib "kernel32" _
    Alias "GetComputerNameA" (ByVal lpBuffer As _
    String, nSize As Long) As Long
' 获取计算机名称的API
Private Declare Function SetComputerName Lib "kernel32" _
    Alias "SetComputerNameA" (ByVal lpComputerName _
    As String) As Long
    
    
Private Sub Command1_Click()
    Dim Name As String, Length As Long
    Length = 255
    Name = String(Length, 0)
    ' 获取名称
    GetComputerName Name, Length
    Name = Left(Name, Length)
    Text1.Text = Name
End Sub

Private Sub Command2_Click()
    Dim Name As String
    Name = Text2.Text
    SetComputerName Name
    MsgBox "改变了电脑名称，必须等到下次关机才生效!"
End Sub