用API函数遍历指定路径的文件

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　　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

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