Buenas esto no es un reto, solo me intriga saber si se pude crear/mejorar una funcion mas rapida que esta que hice para buscar una palabra en un archivo, la funcion trabaja con bytes y no con string, como ejemplo puse que busque una palabra existente dentro del "Explorer.exe" y un bucle de 100 vueltas para exijirle un poco a la función. Tambien comente una palabra inexistente para probar.
no discrimina por mayusculas o minusculas "deve encontrarla de cualquier forma".
Option Explicit
Private Declare Function GetTickCount Lib "kernel32.dll" () As Long
Private Declare Function CharUpperBuffA& Lib "user32" (lpsz As Any, ByVal cchLength&)
Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Private Declare Function ReadFile Lib "kernel32.dll" (ByVal hFile As Long, ByRef lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, ByRef lpNumberOfBytesRead As Long, ByVal lpOverlapped As Long) As Long
Private Declare Function CloseHandle Lib "kernel32.dll" (ByVal hObject As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private Declare Function GetFileSize Lib "kernel32.dll" (ByVal hFile As Long, ByRef lpFileSizeHigh As Long) As Long
Private Declare Function SetFilePointer Lib "kernel32.dll" (ByVal hFile As Long, ByVal lDistanceToMove As Long, ByRef lpDistanceToMoveHigh As Long, ByVal dwMoveMethod As Long) As Long
Private Type LARGE_INTEGER
lowpart As Long
highpart As Long
End Type
Private Const GENERIC_READ As Long = &H80000000
Private Const FILE_SHARE_READ As Long = &H1
Private Const OPEN_EXISTING As Long = 3
Private Const INVALID_HANDLE_VALUE As Long = -1
Private Const FILE_BEGIN As Long = 0
Private aUChars(255) As Byte
Private Function LargeIntToCurrency(Low As Long, High As Long) As Currency
Dim LI As LARGE_INTEGER
LI.lowpart = Low: LI.highpart = High
CopyMemory LargeIntToCurrency, LI, LenB(LI)
LargeIntToCurrency = LargeIntToCurrency * 10000
End Function
Private Function CurrencyToLargeInt(ByVal Curr As Currency) As LARGE_INTEGER
Curr = Curr / 10000
CopyMemory CurrencyToLargeInt, Curr, LenB(Curr)
End Function
Private Function FindWordInFile(ByVal sPath As String, ByVal sWord As String, Optional ByVal bUnicode As Boolean) As Boolean
Dim bArray() As Byte
Dim lRet As Long
Dim hFile As Long
Dim sFind() As Byte
Dim s As String
Dim t As Long
Dim i As Long
Dim FileSize As Currency
Dim tLI As LARGE_INTEGER
Dim LenBuffer As Long
Dim CurPos As Currency
sWord = UCase(sWord)
If bUnicode Then sWord = StrConv(sWord, vbUnicode)
sFind = StrConv(sWord, vbFromUnicode)
hFile = CreateFile(sPath, GENERIC_READ, FILE_SHARE_READ, ByVal 0&, OPEN_EXISTING, 0, 0)
If hFile <> INVALID_HANDLE_VALUE Then
tLI.lowpart = GetFileSize(hFile, tLI.highpart)
LenBuffer = &H2800 ' 10 KB
FileSize = LargeIntToCurrency(tLI.lowpart, tLI.highpart)
If FileSize < UBound(sFind) Then GoTo OutSearch
If LenBuffer > FileSize Then LenBuffer = FileSize
ReDim bArray(LenBuffer - 1)
Do
ReadFile hFile, bArray(0), UBound(bArray) + 1, lRet, 0&
If lRet = 0 Then Exit Do
CurPos = CurPos + lRet
If lRet < LenBuffer Then
ReDim Preserve bArray(lRet)
End If
If InBytes(bArray, sFind) <> -1 Then
FindWordInFile = True
Exit Do
End If
If CurPos = FileSize Then Exit Do
tLI = CurrencyToLargeInt(CurPos - UBound(sFind) + 1)
SetFilePointer hFile, tLI.lowpart, tLI.highpart, FILE_BEGIN
Loop
OutSearch:
CloseHandle hFile
End If
End Function
Public Function InBytes(ByRef bvSource() As Byte, ByRef bvMatch() As Byte) As Long
Dim i As Long
Dim j As Long
Dim lChr As Byte
Dim LenMach As Long
LenMach = UBound(bvMatch)
lChr = bvMatch(0)
If LenMach > 0 Then
For i = 0 To UBound(bvSource) - LenMach
If (lChr = aUChars(bvSource(i))) Then
j = LenMach - 1
Do
If bvMatch(j) <> aUChars(bvSource(i + j)) Then GoTo NotEqual
j = j - 1
Loop While j
InBytes = i
Exit Function
End If
NotEqual:
Next
Else
For i = 0 To UBound(bvSource)
If (lChr = aUChars(bvSource(i))) Then
InBytes = i
Exit Function
End If
Next
End If
InBytes = -1
End Function
Private Sub Form_Initialize()
Dim i As Long
For i = 0 To 255: aUChars(i) = i: Next
CharUpperBuffA aUChars(0), 256
End Sub
Private Sub Form_Load()
Dim t As Long, i As Long, Ret As Boolean
t = GetTickCount
For i = 0 To 100 'Este bucle es solo para exijirle un poco mas a la funcion
Ret = FindWordInFile(Environ("windir") & "\explorer.exe", "Mostrar en el escritorio", True)
'Ret = FindWordInFile(Environ("windir") & "\explorer.exe", "esta palabra no existe")
Next
MsgBox GetTickCount - t
Me.Caption = Ret
End Sub
PD: Complilarlo
Mostrar Mensajes
)+Tokes
!! (?)