用API函数遍历指定路径的文件

　　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

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