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发表评论(0)作者:不详, 平台:VB6.0+Win98, 阅读:10292, 日期:2001-11-26
用API函数遍历指定驱动器、目录的文件


  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

  如果子目录存在则遍历之


If nDir > 0 Then

For i = 0 To nDir - 1

FindFilesAPI = FindFilesAPI + FindFilesAPI(path & dirNames(i) & "\", _

SearchStr, FileCount, DirCount)

Next i

End If

End Function  


  查找按钮代码


Sub Command1_Click()

Dim SearchPath As String, FindStr As String

Dim FileSize As Long

Dim NumFiles As Integer, NumDirs As Integer

Dim iNull As Integer, lpIDList As Long, lResult As Long

Dim sPath As String, udtBI As BrowseInfo

With udtBI


  设置浏览窗口


.hWndOwner = Me.hWnd

  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