同一个程序，多次启动，怎么才能知道某次启动的进程唯一性！
用PID的话，也许关掉进程后，再次启动该进程PID可能会一样（虽然这种可能性非常小）
怎样才能知道某个进程的唯一性呢，即使进程名相同，PID相同，我也知道进程是我那次启动的
[解决办法]
再加上进程的启动时间，应该唯一了。
[解决办法]
新建一个clsMutex的类模块
Option Explicit
Private Declare Function CreateMutex Lib "kernel32" Alias "CreateMutexA" (lpMutexAttributes As SECURITY_ATTRIBUTES, ByVal bInitialOwner As Long, ByVal lpName As String) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type
Private Const ERROR_ALREADY_EXISTS = 183&
Private m_hMutex As Long
Public Function CheckMutex(MutexName As String) As Boolean
Dim s As SECURITY_ATTRIBUTES
m_hMutex = CreateMutex(s, 0, MutexName)
If Err.LastDllError = ERROR_ALREADY_EXISTS Then
CheckMutex = False
Else
CheckMutex = True
End If
End Function
Private Sub Class_Terminate()
CloseHandle m_hMutex
End Sub
Private mut As clsMutex
Private Sub Form_Load()
'保持单一实例
Set mut = New clsMutex
If Not mut.CheckMutex("an unique string") Then End
End Sub
