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用dir判断是否存在，但MkDir，不能创建多级目录，需用循环创建

Function MDir(ByVal folder As String)
    Dim s() As String, i As Long, t As String
    s = Split(folder, "\")
    t = s(0)
    For i = 1 To UBound(s)
        t = t & "\" & s(i)
        If Dir(t, vbDirectory) = "" Then MkDir t
    Next
End Function

'用API里面的方法：
'如果是调用kernel32的函数的话，路径最长不超过260。在260个字符数中你喜欢弄几层是几层。但是如果是使用ntdll的函数的话，限制就要小些，只要目录名不长于256就行了。

Private Declare Function MakeSureDirectoryPathExists Lib "imagehlp.dll" (ByVal DirPath As String) As Long
Function CreatePath(byval fileStr as string)
    If Dir(fileStr, vbDirectory) = "" Then MakeSureDirectoryPathExists fileStr
End Sub