Finding a File Using API

************************* Add to module ***************************
Declare Function FindFirstFile Lib "kernel32" Alias _
"FindFirstFileA" (ByVal lpFileName As String, lpFindFileData _
As WIN32_FIND_DATA) As Long

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

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

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

Public Const MAX_PATH = 260
Public Const MAXDWORD = &HFFFF
Public Const INVALID_HANDLE_VALUE = -1
Public Const FILE_ATTRIBUTE_ARCHIVE = &H20
Public Const FILE_ATTRIBUTE_DIRECTORY = &H10
Public Const FILE_ATTRIBUTE_HIDDEN = &H2
Public Const FILE_ATTRIBUTE_NORMAL = &H80
Public Const FILE_ATTRIBUTE_READONLY = &H1
Public Const FILE_ATTRIBUTE_SYSTEM = &H4
Public Const FILE_ATTRIBUTE_TEMPORARY = &H100

Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type

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

Public 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

************************** Add to Form *************************
Option Explicit

Function FindFilesAPI(path As String, SearchStr As String, _
FileCount As Integer, DirCount As Integer)

Dim FileName As String ' Walking filename variable...
Dim DirName As String ' SubDirectory Name
Dim dirNames() As String ' Buffer for directory name entries
Dim nDir As Integer ' Number of directories in this path
Dim i As Integer ' For-loop counter...
Dim hSearch As Long ' Search Handle
Dim WFD As WIN32_FIND_DATA
Dim Cont As Integer

If Right(path, 1) <> "\" Then path = path & "\"

' Search for subdirectories.
nDir = 0

ReDim dirNames(nDir)

Cont = True

hSearch = FindFirstFile(path & "*", WFD)

If hSearch <> INVALID_HANDLE_VALUE Then
Do While Cont
DirName = StripNulls(WFD.cFileName)

' Ignore the current and encompassing directories.
If (DirName <> ".") And (DirName <> "..") Then

' Check for directory with bitwise comparison.
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) 'Get next subdirectory.

Loop
Cont = FindClose(hSearch)
End If

' Walk through this directory and sum file sizes.

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) ' Get next file
Wend
Cont = FindClose(hSearch)
End If

' If there are sub-directories...

If nDir > 0 Then
' Recursively walk into them...
For i = 0 To nDir - 1
FindFilesAPI = FindFilesAPI + FindFilesAPI(path & _
dirNames(i) & "\", SearchStr, FileCount, DirCount)
Next i
End If

End Function

Private Sub cmdFind_Click()

Dim SearchPath As String, FindStr As String
Dim FileSize As Long
Dim NumFiles As Integer, NumDirs As Integer

Screen.MousePointer = vbHourglass
List1.Clear
SearchPath = txtPath.Text
FindStr = txtSearch.Text
FileSize = FindFilesAPI(SearchPath, FindStr, NumFiles, NumDirs)
txtNum.Text = NumFiles & " Files found in " & NumDirs + 1 & _
" Directories"
txtSize.Text = "Size of files found under " & SearchPath & " = " & _
Format(FileSize, "#,###,###,##0") & " Bytes"
Screen.MousePointer = vbDefault
End Sub