F 文件系统
B 文件
019 快速建立目录 98-8-22
声明：
Private Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type
Private Declare Function CreateDirectory Lib "kernel32" _
Alias "CreateDirectoryA" (ByVal lpPathName As String, _
lpSecurityAttributes As SECURITY_ATTRIBUTES) As Long
函数：
'Call CreateNewDirectory("c:\test\directory\vb\tips\")
Public Sub CreateNewDirectory(NewDirectory As String)
Dim sDirTest As String
Dim SecAttrib As SECURITY_ATTRIBUTES
Dim bSuccess As Boolean
Dim sPath As String
Dim iCounter As Integer
Dim sTempDir As String
iFlag = 0
sPath = NewDirectory
If Right(sPath, Len(sPath)) <> "\" Then
sPath = sPath & "\"
End If
iCounter = 1
Do Until InStr(iCounter, sPath, "\") = 0
iCounter = InStr(iCounter, sPath, "\")
sTempDir = Left(sPath, iCounter)
sDirTest = Dir(sTempDir)
iCounter = iCounter + 1
'create directory
SecAttrib.lpSecurityDescriptor = &O0
SecAttrib.bInheritHandle = False
SecAttrib.nLength = Len(SecAttrib)
bSuccess = CreateDirectory(sTempDir, SecAttrib)
Loop
End Sub
018 开启文件属性窗口 98-8-22
声明：
Type SHELLEXECUTEINFO
cbSize As Long
fMask As Long
hwnd As Long
lpVerb As String
lpFile As String
lpParameters As String
lpDirectory As String
nShow As Long
hInstApp As Long
lpIDList As Long
lpClass As String
hkeyClass As Long
dwHotKey As Long
hIcon As Long
hProcess As Long
End Type
Public Const SEE_MASK_INVOKEIDLIST = &HC
Public Const SEE_MASK_NOCLOSEPROCESS = &H40
Public Const SEE_MASK_FLAG_NO_UI = &H400
Declare Function ShellExecuteEX Lib "shell32.dll" Alias _
"ShellExecuteEx" (SEI As SHELLEXECUTEINFO) As Long
代码：
' 使用： ShowProps("c:\command.com",Me.hWnd)
Public Sub ShowProps(FileName As String, OwnerhWnd As Long)
Dim SEI As SHELLEXECUTEINFO
Dim r As Long
With SEI
.cbSize = Len(SEI)
.fMask = SEE_MASK_NOCLOSEPROCESS Or _
SEE_MASK_INVOKEIDLIST Or SEE_MASK_FLAG_NO_UI
.hwnd = OwnerhWnd
.lpVerb = "properties"
.lpFile = FileName
.lpParameters = vbNullChar
.lpDirectory = vbNullChar
.nShow = 0
.hInstApp = 0
.lpIDList = 0
End With
r = ShellExecuteEX(SEI)
End Sub
017 使用 WIN95 的选择目录对话框 98-7-05
声明：
Private Type BrowseInfo
hWndOwner As Long
pIDLRoot As Long
pszDisplayName As Long
lpszTitle As Long
ulFlags As Long
lpfnCallback As Long
lParam As Long
iImage As Long
End Type
Private Const BIF_RETURNONLYFSDIRS = 1
Private Const MAX_PATH = 260
Private Declare Sub CoTaskMemFree Lib "ole32.dll" (ByVal hMem As Long)
Private Declare Function lstrcat Lib "kernel32" Alias "lstrcatA" _
(ByVal lpString1 As String, ByVal lpString2 As String) As Long
Private Declare Function SHBrowseForFolder Lib "shell32" _
(lpbi As BrowseInfo) As Long
Private Declare Function SHGetPathFromIDList Lib "shell32" _
(ByVal pidList As Long, ByVal lpBuffer As String) As Long
函数：
Public Function BrowseForFolder(hWndOwner As Long, sPrompt As String) As String
Dim iNull As Integer
Dim lpIDList As Long
Dim lResult As Long
Dim sPath As String
Dim udtBI As BrowseInfo
With udtBI
.hWndOwner = hWndOwner
.lpszTitle = lstrcat(sPrompt, "")
.ulFlags = BIF_RETURNONLYFSDIRS
End With
lpIDList = SHBrowseForFolder(udtBI)
If lpIDList Then
sPath = String$(MAX_PATH, 0)
lResult = SHGetPathFromIDList(lpIDList, sPath)
Call CoTaskMemFree(lpIDList)
iNull = InStr(sPath, vbNullChar)
If iNull Then
sPath = Left$(sPath, iNull - 1)
End If
End If
BrowseForFolder = sPath
End Function
016 移动文件到回收站 98-7-04
声明：
Public Type SHFILEOPSTRUCT
hwnd As Long
wFunc As Long
pFrom As String
pTo As String
fFlags As Integer
fAnyOperationsAborted As Long
hNameMappings As Long
lpszProgressTitle As Long
End Type
Public Declare Function SHFileOperation Lib _
"shell32.dll" Alias "SHFileOperationA" (lpFileOp _
As SHFILEOPSTRUCT) As Long
Public Const FO_DELETE = &H3
Public Const FOF_ALLOWUNDO = &H40
代码：
Dim SHop As SHFILEOPSTRUCT
Dim strFile as string
With SHop
.wFunc = FO_DELETE
.pFrom = strFile
.fFlags = FOF_ALLOWUNDO
End With
SHFileOperation SHop
015 比较两个文件 98-7-04
Function CompFile(F1 as string, F2 as string) as boolean
Dim issame as boolean
Open F1 For Binary As #1
Open F2 For Binary As #2
issame = True
If LOF(1) <> LOF(2) Then
issame = False
Else
whole& = LOF(1) \ 10000 'number of whole 10,000 byte chunks
part& = LOF(1) Mod 10000 'remaining bytes at end of file
buffer1$ = String$(10000, 0)
buffer2$ = String$(10000, 0)
start& = 1
For x& = 1 To whole& 'this for-next loop will get 10,000
Get #1, start&, buffer1$ 'byte chunks at a time.
Get #2, start&, buffer2$
If buffer1$ <> buffer2$ Then
issame = False
Exit For
End If
start& = start& + 10000
Next
buffer1$ = String$(part&, 0)
buffer2$ = String$(part&, 0)
Get #1, start&, buffer1$ 'get the remaining bytes at the end
Get #2, start&, buffer2$ 'get the remaining bytes at the end
If buffer1$ <> buffer2$ Then
issame = False
End If
Close
CompFile = issame
End Function
014 取得临时文件名 98-6-30
声明：
Public Const MAX_PATH = 260
Public Declare Function GetTempFileName Lib "kernel32" Alias "GetTempFileNameA" (ByVal lpszPath As String, ByVal lpPrefixString As String, ByVal wUnique As Long, ByVal lpTempFileName As String) As Long
Public Declare Function GetTempPath Lib "kernel32" Alias "GetTempPathA" (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long
代码：
Public Function GetTempFile() As String
Dim lngRet As Long
Dim strBuffer As String, strTempPath As String
'初始化 buffer
strBuffer = String$(MAX_PATH, 0)
'取得临时路径
lngRet = GetTempPath(Len(strBuffer), strBuffer)
'0 错误
If lngRet = 0 Then Exit Function
'去掉尾中的 null
strTempPath = Left$(strBuffer, lngRet)
'初始化 buffer
strBuffer = String$(MAX_PATH, 0)
'取得临时文件名
lngRet = GetTempFileName(strTempPath, "tmp", 0&, strBuffer)
If lngRet = 0 Then Exit Function
lngRet = InStr(1, strBuffer, Chr(0))
If lngRet > 0 Then
GetTempFile = Left$(strBuffer, lngRet - 1)
Else
GetTempFile = strBuffer
End If
End Function
013 确定是 WINDOWS 的可执行文件 98-6-17
在文件的第 24 字节，如果为40h，就是 Windows 的可执行文件。
Function WinExe (ByVal Exe As String) As Integer
Dim fh As Integer
Dim t As String * 1
fh = FreeFile
Open Exe For Binary As #fh
Get fh, 25, t
Close #fh
WinExe = (Asc(t) = &H40&)
End Function
012 建立多级目录 98-6-16
Sub CreateLongDir(sDrive As String, sDir As String)
Dim sBuild As String
While InStr(2, sDir, "\") > 1
sBuild = sBuild & left(sDir, InStr(2, sDir, "\") - 1)
sDir = Mid(sDir, InStr(2, sDir, "\"))
If Dir(sDrive & sBuild, 16) = "" Then
MkDir sDrive & sBuild
End If
Wend
End Sub
011 取得文件的扩展名 98-6-06
Function GetExtension(Filename As String)
Dim PthPos, ExtPos As Integer
For i = Len(Filename) To 1 Step -1 ' Go from the Length of the filename, to the first character by 1.
If Mid(Filename, i, 1) = "." Then ' If the current position is '.' then...
ExtPos = i ' ...Change the ExtPos to the number.
For j = Len(Filename) To 1 Step -1 ' Do the Same...
If Mid(Filename, j, 1) = "\" Then ' ...but for '\'.
PthPos = j ' Change the PthPos to the number.
Exit For ' Since we found it, don't search any more.
End If
Next j
Exit For ' Since we found it, don't search any more.
End If
Next i
If PthPos > ExtPos Then
Exit Function ' No extension.
Else
If ExtPos = 0 Then Exit Function ' If there is not extension, then exit sub.
GetExtension = Mid(Filename, ExtPos + 1, Len(Filename) - ExtPos) 'Messagebox the Extension
End If
End Function
使用：
FileExt = GetExtension("c:\windows\vb\vb.exe")
010 从全路径名中提取文件名 98-6-06
Function StripPath(T$) As String
Dim x%, ct%
StripPath$ = T$
x% = InStr(T$, "\")
Do While x%
ct% = x%
x% = InStr(ct% + 1, T$, "\")
Loop
If ct% > 0 Then StripPath$ = Mid$(T$, ct% + 1)
End Function
例子：
File = StripPath("c:\windows\hello.txt")
009 把文件置入到Text 或RichText 中 98-6-05
dim sFile as string
'Set sFile equal to your filename
dim i as long
i = freefile()
open sFile for input as #i
txtMain.text = input$(i,LOF(i))
close #1
008 检测文件是否存在
Function FileExists(FileName As String) As Boolean
On Error Resume Next
FileExists = Dir$(FileName) <> ""
If Err.Number <> 0 Then
FileExists = False
End If
On Error GoTo 0
End Function
参见：X008 文件相关过程
007 增加快捷方式到 启动 组
利用 DDE 可方便地建立快捷方式：（Text1 为表单中的 Textbox）
Text1.LinkTopic = "Progman|Progman"
Text1.LinkMode = 2
Text1.LinkExecute "[ShowGroup(启动, 4)]"
Text1.LinkExecute "[AddItem(c:\vb5\myprog.exe, 我的程序)]"
参见： FB001 建立快捷方式
006 目录所占的字节数
该函数返回目录使用的字节数：
Function DirUsedBytes(ByVal dirName As String) As Long
Dim FileName As String
Dim FileSize As Currency
If Right$(dirName, 1) <> "\" Then
dirName = dirName & "\"
Endif
FileSize = 0
FileName = Dir$(dirName & "*.*")
Do While FileName <> ""
FileSize = FileSize + _
FileLen(dirName & FileName)
FileName = Dir$
Loop
DirUsedBytes = FileSize
使用：
MsgBox DirUsedBytes("C:\Windows")
005 打开 Win95 的创建快捷方式窗口
以下的代码演示了如何利用 Win95 的 Wizard 在指定的目录中建立快捷方式。
Dim X As Integer
X = Shell("C:\WINDOWS\rundll32.exe AppWiz.Cpl,NewLinkHere " & App.Path & "\", 1)
004 取得短文件名
如果要传递文件到老的不支持长文件名的应用，以下的函数可以派上用场：
Declare Function GetShortPathName Lib "kernel32" Alias "GetShortPathNameA" (ByVal lpszLongPath As String, ByVal lpszShortPath As String, ByVal cchBuffer As Long) As Long
Function ShortName(LongPath As String) As String
Dim ShortPath As String
Const MAX_PATH = 260
Dim ret&
ShortPath = Space$(MAX_PATH)
ret& = GetShortPathName(LongPath, ShortPath, MAX_PATH)
If ret& Then
ShortName = Left$(ShortPath, ret&)
End If
End Function
003 显示盘中所有的目录
以下的代码把盘中所有的目录都显示在 Listbox 中。需要一个 DriveListBox 和一个 DirListBox。如果 DirListBox 隐藏的话，处理可以快一些。
Dim iLevel As Integer, iMaxSize As Integer
Dim i As Integer, j As Integer
ReDim iDirCount(22) As Integer
'最大 22 级目录
ReDim sdirs(22, 1) As String
'drive1 是 DriveListBox 控件
'dir1 是 DirListBox 控件
iLevel = 1
iDirCount(iLevel) = 1
iMaxSize = 1
sdirs(iLevel, iDirCount(iLevel)) = Left$(drive1.Drive, 2) & "\"
Do
iLevel = iLevel + 1
iDirCount(iLevel) = 0
For j = 1 To iDirCount(iLevel - 1)
dir1.Path = sdirs(iLevel - 1, j)
dir1.Refresh
If iMaxSize < (iDirCount(iLevel) + dir1.ListCount) Then
ReDim Preserve sdirs(22, iMaxSize + dir1.ListCount + 1) As String
iMaxSize = dir1.ListCount + iDirCount(iLevel) + 1
End If
For i = 0 To dir1.ListCount - 1
iDirCount(iLevel) = _
iDirCount(iLevel) + 1 '子目录记数
sdirs(iLevel, iDirCount(iLevel)) = dir1.List(i)
Next i
Next j
'所有名称放到 List1 中
list1.Clear
If iDirCount(iLevel) = 0 Then
'如果无自目录
For i = 1 To iLevel
For j = 1 To iDirCount(i)
list1.AddItem sdirs(i, j)
Next j
Next i
Exit Do
End If
Loop
002 取得长文件名
Public Function GetLongFilename (ByVal sShortName As String) As String
Dim sLongName As String
Dim sTemp As String
Dim iSlashPos As Integer
'Add \ to short name to prevent Instr from failing
sShortName = sShortName & "\"
'Start from 4 to ignore the "[Drive Letter]:\" characters
iSlashPos = InStr(4, sShortName, "\")
'Pull out each string between \ character for conversion
While iSlashPos
sTemp = Dir(Left$(sShortName, iSlashPos - 1), _
vbNormal + vbHidden + vbSystem + vbDirectory)
If sTemp = "" Then
'Error 52 - Bad File Name or Number
GetLongFilename = ""
Exit Function
End If
sLongName = sLongName & "\" & sTemp
iSlashPos = InStr(iSlashPos + 1, sShortName, "\")
Wend
'Prefix with the drive letter
GetLongFilename = Left$(sShortName, 2) & sLongName
End Function
001 建立快捷方式
Private Declare Function fCreateShellLink Lib "vb5stkit.DLL" (ByVal _
lpstrFolderName As String, ByVal lpstrLinkName As String, ByVal _
lpstrLinkPath As String, ByVal lpstrLinkArgs As String) As Long
Private Sub MakeShortCuts()
Dim lReturn As Long
Dim MyPath As String
Dim MyName As String
MyPath = App.Path
MyName = App.EXEName
'增加到桌面
lReturn = fCreateShellLink("..\..\Desktop", _
"Shortcut to Net Timer", MyPath & "\" & MyName, "")
'增加到启动组
lReturn = fCreateShellLink("\启动", "Shortcut to Net Timer", _
MyPath & "\" & MyName, "")
End Sub
