有一个查找指定文件夹中文件名原程序如下：
Dim s As String
s = Dir("E:\vbis练习\data\*.shp") '搜索所有文件
Do While s <> "" '执行搜索
Print s
s = Dir()
Loop
这个程序有两点我不太明白。1、s=Dir()中Dir函数为什么没有参数？2、为什么只列出文件名，而这个文件夹中包含的其他文件夹名称没有列出来？
------解决方案--------------------------------------------------------
列出文件夹：
Sub test2()
MyPath = "d:\" ' Set the path.
MyName = Dir(MyPath, vbDirectory) ' Retrieve the first entry.
Do While MyName <> "" ' Start the loop.
' Ignore the current directory and the encompassing directory.
If MyName <> "." And MyName <> ".." Then
' Use bitwise comparison to make sure MyName is a directory.
If (GetAttr(MyPath & MyName) And vbDirectory) = vbDirectory Then
Debug.Print MyName ' Display entry only if it
End If ' it represents a directory.
End If
MyName = Dir ' Get next entry.
Loop
End Sub