在Windows下安装过程序的用户可能都有这样的体会，当安装完某些应用程序后，安装程序会要求重新启动计算机以使设置生效。那么，如果要用VB程序重新启动计算机该如何实现呢？其实利用ExitWindowsEx函数即可。
程序的编写
1．首先运行VB，然后新建一个工程（工程类型为标准EXE），然后双击Form1窗体，进入代码（Code）输入框，在其中输入：
Private
Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, ByVal
dwReserved As Long)As
Long
2．点击“工具箱”中的commandbutton（命令按钮）工具，即可在窗体Form1中加入一个命令按钮，然后将该按钮属性中的Caption值定义为“重新启动”。完成之后双击该按钮，进入代码（code）输入框输入以下代码：
Private Sub Command1_Click()
ExitWindowsEx &H43,0
End
Sub
程序的执行
程序输入完成后，点击VB“运行”菜单中的“启动”或“全面编译”命令，然后点击“重新启动”按钮，即可重新启动计算机。
二、磁盘格式化
在Windows
9X中，当用鼠标右键单击“我的电脑”中的“3.5软盘A”然后在出现的右键菜单中选择“格式化”选项，就将弹出标准的“磁盘格式化”窗口。下面我们来看看如何在应用程序中利用函数轻松调用Windows
95标准的“磁盘格式化”窗口，实现对磁盘相应的操作功能。
程序的编写
1．与上例相同，首先运行VB，新建一个标准工程，然后利用“工具箱”在Form1窗体中加入一个命令按钮对象，将该命令按钮属性中的Caption值定义为“软盘格式化”。完成之后双击该按钮，在代码输入框中输入以下代码：
Private Sub Command1_Click()Call FormatFloppy '调用FormatFloppy过程
End
Sub
2．然后用鼠标右击窗体，选择右键菜单中的“添加/添加模块”选项，然后在出现的选择框中选择“模块”类型，接着在出现的模块代码输入框中加入以下代码：（注：模块是指一组声明的集合，其后为过程）
'通用声明
Public Const WM_CLOSE=&H10
Declare Function FindWindow Lib
"user32" Alias"FindWindowA"(ByVal lpClassName As Any,
ByVal
lpWindowName As Any)As Long
Delare Function
GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal
lpBuffer
As String, ByVal nSize As Long) As Long
Declare Function
SetWindowPos Lib "user32"(BvVal hwnd As Long ByVal hWndInsertAfter As
Long,
ByVal X As long, ByVal y As Long, ByVal cx As Long,ByVal cy As
Long, ByVal wFlags As Long) As Long
Declare Function GetDesktopWindow
Lib "user32"() As Long
Declare Function LockWindowUpdate Lib "user32"
(ByVal hwndLock As Long)As Long
Declare Function GetWindowRect Lib
"user32"(ByVay hwnd As Long, lpRect As RECT) As Long
Declare Sub
Sleep Lib "kernel32" (ByValdwMilliseconds As Long)
Type
RECT
Left As Long
Top As
Long
Right As Long
Bottom
As Long
End Type
TypePOINTAPI
X As
Long
y As Long
End Type
Const
SWP_NOSIZE=&H1
Const
SWP_NOZORDER=&H4
'FormatFloppy()过程声明
Public Sub
FormatFloppy()
Dim sBuffer As String, Windir As
String, Procs As String, X
Dim lResult As
Long
sBuffer = String$(255,0)
lResult = GetWindowsDirectory(sBuffer,
Len(sBuffer))
Windir =
Trim(sBuffer)
Procs = Left(Windir, lResult)
& "\rundll32.exe shell32.dll,SHFormatDrive"
Call CenterDialog("Format - 3? Floppy (A:)")
X =
Shell(Procs,1)
Call CenterDialog("Format - 3? Floppy
(A:)")
k = LockWindowUpdate(0)
End
Sub
CenterDialog 过程声明
Public Sub CenterDialog(WinText As
String)
DoEvents
On Error
Resume Next
Dim D3 As Long
D3
= LockWindowUpdate(GetDesktopWindow())
Dim
wdth%
Dim hght%
Dim
Scrwdth%
Dim Scrhght%
Dim
lpDlgRect As RECT
Dim lpdskrect As
RECT
Dim hTaskBar As Long
hTaskBar = FindWindow(0&,WinText)
Call
GetWindowRect(hTaskBar, lpDlgRect)
wdth% =
lpDlgRect.Right - lpDlgRect.Left
hght% =
lpDlgRect.Bottom - lpDlgRect.Top
Call
GetWindowRect(GetDesktopWindow(),lpdskrect)
Scrwdth%
= lpdskrect.Right - lpdskrect.Left
Scrhght% =
lpdskrect.Bottom - lpdskrect.Top
X% = (Scrwdth% -
wdth%) / 2
y% = (Scrhght% - hght%) /
2
Call SetWindowPos(hTaskBar, 0, X%, y%,0,0,
SWP_NOZORDER Or SWP_NOSIZE)
DoEvents
End
Sub
程序的执行
程序输入完成后，点击VB“运行”菜单中的“启动”或“全面编译”命令，点击“软盘格式化”按钮后选择要格式化的容量，即可对3.5英寸盘进行格式化操作。
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