Question

vb检测进程存在不存在

这是我在网上找的代码.可以用.
但是当他检测之后就不会检测了.
也就是如果进程一开始存在,那么他就一直显示存在.
如果不存在那他就一直显示不存在.
怎么才能让他一直检测下去.
就是一打开就能检测的到.一关闭也能检测的到.

Const TH32CS_SNAPHEAPLIST = &H1
Const TH32CS_SNAPPROCESS = &H2
Const TH32CS_SNAPTHREAD = &H4
Const TH32CS_SNAPMODULE = &H8
Const TH32CS_SNAPALL = (TH32CS_SNAPHEAPLIST Or TH32CS_SNAPPROCESS Or TH32CS_SNAPTHREAD Or TH32CS_SNAPMODULE)
Const TH32CS_INHERIT = &H80000000
Const MAX_PATH As Integer = 260
Private Type PROCESSENTRY32
dwSize As Long
cntUsage As Long
th32ProcessID As Long
th32DefaultHeapID As Long
th32ModuleID As Long
cntThreads As Long
th32ParentProcessID As Long
pcPriClassBase As Long
dwFlags As Long
szExeFile As String * MAX_PATH
End Type
Private Declare Function CreateToolhelp32Snapshot Lib "kernel32" (ByVal lFlags As Long, ByVal lProcessID As Long) As Long
Private Declare Function Process32First Lib "kernel32" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long
Private Declare Function Process32Next Lib "kernel32" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long
Private Declare Sub ExitProcess Lib "kernel32" (ByVal uExitCode As Long)
Private Declare Function GetExitCodeProcess Lib "kernel32" (ByVal hProcess As Long, lpExitCode As Long) As Long

Function exitproc(ByVal exefile As String) As Boolean
exitproc = False
Dim hSnapShot As Long, uProcess As PROCESSENTRY32
hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPALL, 0&)
uProcess.dwSize = Len(uProcess)
r = Process32First(hSnapShot, uProcess)
Do While r
If Left$(uProcess.szExeFile, IIf(InStr(1, uProcess.szExeFile, Chr$(0)) > 0, InStr(1, uProcess.szExeFile, Chr$(0)) - 1, 0)) = exefile Then
exitproc = True
Exit Do
End If
r = Process32Next(hSnapShot, uProcess)
Loop
End Function

Private Sub Form_Load()
If exitproc("qq.exe") Then '检测QQ.exe进程是否存在
Label1 = "存在！"
Else
Label1 = "不存在！"
End If
End Sub

Answer 1

'添加Timer1控件 设置interval为400
Private Sub Timer1_Timer()
If exitproc("qq.exe") Then '检测QQ.exe进程是否存在
Label1 = "存在！"
Else
Label1 = "不存在！"
End If
End Sub