从字符串中分离文件路径,文件名及其扩展名

此函数从字符串中分离出路径
Function ParsePath (sPathIn As String) As String
　Dim I As Integer
　For I = Len(sPathIn) To 1 Step -1
　　If InStr(":\", Mid$(sPathIn, I, 1)) Then Exit For
　Next
　ParsePath = Left$(sPathIn, I)
End Function
此函数从字符串中分离出文件名
Function ParseFileName (sFileIn As String) As String
　Dim I As Integer
　For I = Len(sFileIn) To 1 Step -1
　　If InStr("\", Mid$(sFileIn, I, 1)) Then Exit For
　Next
　ParseFileName = Mid$(sFileIn, I 1, Len(sFileIn) - I)
End Function
此函数从字符串中分离出文件扩展名
Function GetFileExt (sFileName As String) As String
　Dim P As Integer
　For P = Len(sFileName) To 1 Step -1
　　If InStr(".", Mid$(sFileName, P, 1)) Then Exit For
　Next
　GetFileExt = Right$(sFileName, Len(sFileName) - P)
End Function