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Tip of the Day
Language: VB6
Expertise: Intermediate
Apr 21, 2001

FilesToArray - Read all the files or subdirectories in a directory using API functions

Private Declare Function FindFirstFile Lib "kernel32" Alias "FindFirstFileA" _
    (ByVal lpFileName As String, lpFindFileData As WIN32_FIND_DATA) As Long
Private Declare Function FindNextFile Lib "kernel32" Alias "FindNextFileA" _
    (ByVal hFindFile As Long, lpFindFileData As WIN32_FIND_DATA) As Long
Private Declare Function FindClose Lib "kernel32" (ByVal hFindFile As Long) As _
    Long
Const MAX_PATH = 260

Private Type FILETIME
    dwLowDateTime As Long
    dwHighDateTime As Long
End Type
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

' Returns a one-based string array containing the files (or directories)
' located in the specified path
'
' the Path argument can contain wildcards, e.g. "C:\*.doc")

Function FilesToArray(ByVal Path As String, Optional ByVal IncludeDirs As _
    Boolean) As String()
    Dim lRet As Long
    Dim handle As Long
    Dim FindData As WIN32_FIND_DATA
    Dim FileName As String
    Dim fileCount As Long
    Dim ok As Boolean
    ReDim res(0) As String
    
    ' start the searching, exit if no file matches the spec
    handle = FindFirstFile(Path, FindData)
    If handle < 0 Then
        FilesToArray = res()
        Exit Function
    End If
        
    Do
        ' get this entry's name
        FileName = Left$(FindData.cFileName, InStr(FindData.cFileName, _
            vbNullChar) - 1)
        
        If (FindData.dwFileAttributes And vbDirectory) = 0 Then
            ' this is a file
            ok = Not IncludeDirs
        ElseIf FileName <> "." And FileName <> ".." Then
            ' this is a directory, but not a ./.. entry
            ok = IncludeDirs
        Else
            ' this is a ./.. entry
            ok = False
        End If
            
        If ok Then
            ' add this entry to the result
            fileCount = fileCount + 1
            If fileCount > UBound(res) Then
                ' make room in the array if necessary
                ReDim Preserve res(fileCount + 100) As String
            End If
            res(fileCount) = FileName
        End If
        ' read the next file, returns zero when there are no more files
        lRet = FindNextFile(handle, FindData)
    Loop While lRet

    ' stop enumeration
    FindClose handle
    
    ' discard unused array items and return to caller
    ReDim Preserve res(0 To fileCount) As String
    FilesToArray = res
End Function

Francesco Balena
 
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