获取系统的安装目录.frm

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VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "获取系统安装目录"
      Height          =   495
      Left            =   960
      TabIndex        =   0
      Top             =   1140
      Width           =   1935
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long

Private Sub Command1_Click()
    Dim Buff As String
    Buff = Space(50)
    GetWindowsDirectory Buff, 50
    Buff = Left(Buff, InStr(Buff, Chr(0)) - 1)
    MsgBox Buff
End Sub