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首页 - 经验之谈 - 用API函数遍历指定驱动器、目录的文件
发表评论(0)作者:不详, 平台:VB6.0+Win98, 阅读:7932, 日期:2004-10-28
  以下代码演示了如何用Windows API函数遍历指定驱动器、目录的所有文件。其思路是:调出浏览文件夹窗口让用户指定所要搜索的起始路径,然后用查找文件的API函数遍历该目录下及其包含的子目录下的所有文件。本例需要:一个按钮,一个TextBox和一个ListBox,其中,TextBox应设置为多行。
核心代码参照API-Guide的两个例子程序,特此声明。

Option Explicit

  查找第一个文件的API

Private Declare Function FindFirstFile Lib "kernel32" Alias "FindFirstFileA" (ByVal lpFileName As String, lpFindFileData As WIN32_FIND_DATA) As Long

  查找下一个文件的API

Private Declare Function FindNextFile Lib "kernel32" Alias "FindNextFileA" (ByVal hFindFile As Long, lpFindFileData As WIN32_FIND_DATA) As Long

  获取文件属性的API

Private Declare Function GetFileAttributes Lib "kernel32" Alias "GetFileAttributesA" (ByVal lpFileName As String) As Long

  关闭查找文件的API

Private Declare Function FindClose Lib "kernel32" (ByVal hFindFile As Long) As Long

  以下为调用浏览文件夹窗口的API

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  

 常量

Const MAX_PATH = 260
Const MAXDWORD = &HFFFF
Const INVALID_HANDLE_VALUE = -1
Const FILE_ATTRIBUTE_ARCHIVE = &H20
Const FILE_ATTRIBUTE_DIRECTORY = &H10
Const FILE_ATTRIBUTE_HIDDEN = &H2
Const FILE_ATTRIBUTE_NORMAL = &H80
Const FILE_ATTRIBUTE_READONLY = &H1
Const FILE_ATTRIBUTE_SYSTEM = &H4
Const FILE_ATTRIBUTE_TEMPORARY = &H100
Const BIF_RETURNONLYFSDIRS = 1
Private Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type  

  定义类(用于查找文件)

Private Type WIN32_FIND_DATA
dwFileAttributes As Long
ftCreationTime As FILETIME
ftLastAccessTime As FILETIME
ftLastWriteTime As FILETIME
nFileSizeHigh As Long
nFileSizeLow As Long
dwReserved0 As Long
dwReserved1 As Long
cFileName As String * MAX_PATH
cAlternate As String * 14
End Type
 定义类(用于浏览文件夹窗口)

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  

  自定义函数

Function StripNulls(OriginalStr As String) As String
If (InStr(OriginalStr, Chr(0)) > 0) Then
OriginalStr = Left(OriginalStr, InStr(OriginalStr, Chr(0)) - 1)
End If
StripNulls = OriginalStr
End Function  

  自定义函数

Function FindFilesAPI(path As String, SearchStr As String, FileCount As Integer, _
DirCount As Integer)
Dim FileName As String    文件名
Dim DirName As String    子目录名
Dim dirNames() As String    目录数组
Dim nDir As Integer    当前路径的目录数
Dim i As Integer    循环计数器变量
Dim hSearch As Long    搜索句柄变量
Dim WFD As WIN32_FIND_DATA
Dim Cont As Integer
If Right(path, 1) <> "\" Then path = path & "\"
 搜索子目录

nDir = 0
ReDim dirNames(nDir)
Cont = True
hSearch = FindFirstFile(path & "*", WFD)
If hSearch <> INVALID_HANDLE_VALUE Then
Do While Cont
DirName = StripNulls(WFD.cFileName)
If (DirName <> ".") And (DirName <> "..") Then
If GetFileAttributes(path & DirName) And FILE_ATTRIBUTE_DIRECTORY Then
dirNames(nDir) = DirName
DirCount = DirCount + 1
nDir = nDir + 1
ReDim Preserve dirNames(nDir)
End If
End If
Cont = FindNextFile(hSearch, WFD)   获取下一个子目录
Loop
Cont = FindClose(hSearch)
End If

   遍历目录并累计文件总数

hSearch = FindFirstFile(path & SearchStr, WFD)
Cont = True
If hSearch <> INVALID_HANDLE_VALUE Then
While Cont
FileName = StripNulls(WFD.cFileName)
If (FileName <> ".") And (FileName <> "..") Then
FindFilesAPI = FindFilesAPI + (WFD.nFileSizeHigh * MAXDWORD) + WFD.nFileSizeLow
FileCount = FileCount + 1
List1.AddItem path & FileName
End If
Cont = FindNextFile(hSearch, WFD)    获取下一个文件
Wend
Cont = FindClose(hSearch)
End If
 搜索子目录

nDir = 0
ReDim dirNames(nDir)
Cont = True
hSearch = FindFirstFile(path & "*", WFD)
If hSearch <> INVALID_HANDLE_VALUE Then
Do While Cont
DirName = StripNulls(WFD.cFileName)
If (DirName <> ".") And (DirName <> "..") Then
If GetFileAttributes(path & DirName) And FILE_ATTRIBUTE_DIRECTORY Then
dirNames(nDir) = DirName
DirCount = DirCount + 1
nDir = nDir + 1
ReDim Preserve dirNames(nDir)
End If
End If
Cont = FindNextFile(hSearch, WFD)   获取下一个子目录
Loop
Cont = FindClose(hSearch)
End If

   遍历目录并累计文件总数

hSearch = FindFirstFile(path & SearchStr, WFD)
Cont = True
If hSearch <> INVALID_HANDLE_VALUE Then
While Cont
FileName = StripNulls(WFD.cFileName)
If (FileName <> ".") And (FileName <> "..") Then
FindFilesAPI = FindFilesAPI + (WFD.nFileSizeHigh * MAXDWORD) + WFD.nFileSizeLow
FileCount = FileCount + 1
List1.AddItem path & FileName
End If
Cont = FindNextFile(hSearch, WFD)    获取下一个文件
Wend
Cont = FindClose(hSearch)
End If
 返回选中的目录

.ulFlags = BIF_RETURNONLYFSDIRS
End With  

  调出浏览窗口

lpIDList = SHBrowseForFolder(udtBI)
If lpIDList Then
sPath = String$(MAX_PATH, 0)

  获取路径

SHGetPathFromIDList lpIDList, sPath

  释放内存

CoTaskMemFree lpIDList
iNull = InStr(sPath, vbNullChar)
If iNull Then
sPath = Left$(sPath, iNull - 1)
End If
End If

Screen.MousePointer = vbHourglass
List1.Clear

SearchPath = sPath   选中的目录为搜索的起始路径
FindStr = "*.*"   搜索所有类型的文件(此处可另作定义)
FileSize = FindFilesAPI(SearchPath, FindStr, NumFiles, NumDirs)
Text1.Text = "查找到的文件数:" & NumFiles & vbCrLf & "查找的目录数:" & _
NumDirs + 1 & vbCrLf & "文件大小总共为:" & vbCrLf & _

Format(FileSize, "#,###,###,##0") & "字节"
Screen.MousePointer = vbDefault
End Sub