If Dir(文件路径+文件名) = "" Then 文件不存在 else 文件存在 end ifkill 文件路径+文件名
dim i as integer dim FileLx as string i=instr(dlg.filename,".") filelx=right(dlg.filename,len(dlg.filename)-i)
楼上的函数每一个都不好用,如果不是特殊情况可以使用,但是我强烈建议不要用vb自己带的函数,因为我试过几次有时候都没有成功 Declare Function DeleteFile Lib "kernel32" Alias "DeleteFileA" (ByVal lpFileName As String) As Long 用这个删除保证不出错 用法:DeleteFile 文件名至于文件存在检查也推荐你用api: Private Declare Function GetFileAttributes Lib "kernel32" Alias "GetFileAttributesA" (ByVal lpFileName As String) As LongPublic Function FileExist(FileDir As String) As Integer '[函数]:文件是否存在 '[参数]:被检查文件 '[返回]:0,不存在;1,存在Dim sF As Long sF = GetFileAttributes(FileDir) FileExist = (sF <> -1) If sF = -1 Or sF = 0 Then FileExist = 0 Else FileExist = 1 End If End Function
用InStrRev函数,从字符的末尾计算。
'此函数从字符串中分离出路径 Public Function GetFilePath(sPathIn As String) As String Dim i As Integer For i = Len(sPathIn) To 1 Step -1 If InStr(":\", Mid$(sPathIn, i, 1)) Then Exit For Next GetFilePath = Left$(sPathIn, i) End Function '此函数从字符串中分离出文件名 Public Function GetFileName(sFileIn As String) As String Dim i As Integer For i = Len(sFileIn) To 1 Step -1 If InStr("\", Mid$(sFileIn, i, 1)) Then Exit For Next GetFileName = Mid$(sFileIn, i + 1, Len(sFileIn) - i) End Function '此函数从字符串中分离出文件扩展名 Public 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
文件不存在
else
文件存在
end ifkill 文件路径+文件名
dim i as integer
dim FileLx as string
i=instr(dlg.filename,".")
filelx=right(dlg.filename,len(dlg.filename)-i)
Declare Function DeleteFile Lib "kernel32" Alias "DeleteFileA" (ByVal lpFileName As String) As Long
用这个删除保证不出错
用法:DeleteFile 文件名至于文件存在检查也推荐你用api:
Private Declare Function GetFileAttributes Lib "kernel32" Alias "GetFileAttributesA" (ByVal lpFileName As String) As LongPublic Function FileExist(FileDir As String) As Integer
'[函数]:文件是否存在
'[参数]:被检查文件
'[返回]:0,不存在;1,存在Dim sF As Long
sF = GetFileAttributes(FileDir)
FileExist = (sF <> -1)
If sF = -1 Or sF = 0 Then
FileExist = 0
Else
FileExist = 1
End If
End Function
Public Function GetFilePath(sPathIn As String) As String
Dim i As Integer
For i = Len(sPathIn) To 1 Step -1
If InStr(":\", Mid$(sPathIn, i, 1)) Then Exit For
Next
GetFilePath = Left$(sPathIn, i)
End Function
'此函数从字符串中分离出文件名
Public Function GetFileName(sFileIn As String) As String
Dim i As Integer
For i = Len(sFileIn) To 1 Step -1
If InStr("\", Mid$(sFileIn, i, 1)) Then Exit For
Next
GetFileName = Mid$(sFileIn, i + 1, Len(sFileIn) - i)
End Function
'此函数从字符串中分离出文件扩展名
Public 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