Código
Const MOVEFILE_REPLACE_EXISTING = &H1 Const FILE_ATTRIBUTE_TEMPORARY = &H100 Const FILE_BEGIN = 0 Const FILE_SHARE_READ = &H1 Const FILE_SHARE_WRITE = &H2 Const CREATE_NEW = 1 Const OPEN_EXISTING = 3 Const GENERIC_READ = &H80000000 Const GENERIC_WRITE = &H40000000 Private Declare Function SetVolumeLabel Lib "kernel32" Alias "SetVolumeLabelA" (ByVal lpRootPathName As String, ByVal lpVolumeName As String) As Long Private Declare Function WriteFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, ByVal lpOverlapped As Any) As Long Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, ByVal lpOverlapped As Any) As Long Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, ByVal lpSecurityAttributes As Any, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long Private Declare Function SetFilePointer Lib "kernel32" (ByVal hFile As Long, ByVal lDistanceToMove As Long, lpDistanceToMoveHigh As Long, ByVal dwMoveMethod As Long) As Long Private Declare Function SetFileAttributes Lib "kernel32" Alias "SetFileAttributesA" (ByVal lpFileName As String, ByVal dwFileAttributes As Long) As Long Private Declare Function GetFileSize Lib "kernel32" (ByVal hFile As Long, lpFileSizeHigh As Long) As Long Private Declare Function GetTempFileName Lib "kernel32" Alias "GetTempFileNameA" (ByVal lpszPath As String, ByVal lpPrefixString As String, ByVal wUnique As Long, ByVal lpTempFileName As String) As Long Private Declare Function MoveFileEx Lib "kernel32" Alias "MoveFileExA" (ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal dwFlags As Long) As Long Private Declare Function DeleteFile Lib "kernel32" Alias "DeleteFileA" (ByVal lpFileName As String) As Long Private Sub Form_Load() 'KPD-Team 1998 'URL: http://www.allapi.net/ 'E-Mail: KPDTeam@Allapi.net Dim sSave As String, hOrgFile As Long, hNewFile As Long, bBytes() As Byte Dim sTemp As String, nSize As Long, Ret As Long 'Ask for a new volume label sSave = InputBox("Please enter a new volume label for drive C:\" + vbCrLf + " (if you don't want to change it, leave the textbox blank)") If sSave <> "" Then SetVolumeLabel "C:\", sSave End If 'Create a buffer sTemp = String(260, 0) 'Get a temporary filename GetTempFileName "C:\", "KPD", 0, sTemp 'Remove all the unnecessary chr$(0)'s sTemp = Left$(sTemp, InStr(1, sTemp, Chr$(0)) - 1) 'Set the file attributes SetFileAttributes sTemp, FILE_ATTRIBUTE_TEMPORARY 'Open the files hNewFile = CreateFile(sTemp, GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, ByVal 0&, OPEN_EXISTING, 0, 0) hOrgFile = CreateFile("c:\config.sys", GENERIC_READ, FILE_SHARE_READ Or FILE_SHARE_WRITE, ByVal 0&, OPEN_EXISTING, 0, 0) 'Get the file size nSize = GetFileSize(hOrgFile, 0) 'Set the file pointer SetFilePointer hOrgFile, Int(nSize / 2), 0, FILE_BEGIN 'Create an array of bytes ReDim bBytes(1 To nSize - Int(nSize / 2)) As Byte 'Read from the file ReadFile hOrgFile, bBytes(1), UBound(bBytes), Ret, ByVal 0& 'Check for errors If Ret <> UBound(bBytes) Then MsgBox "Error reading file ..." 'Write to the file WriteFile hNewFile, bBytes(1), UBound(bBytes), Ret, ByVal 0& 'Check for errors If Ret <> UBound(bBytes) Then MsgBox "Error writing file ..." 'Close the files CloseHandle hOrgFile CloseHandle hNewFile 'Move the file MoveFileEx sTemp, "C:\KPDTEST.TST", MOVEFILE_REPLACE_EXISTING 'Delete the file DeleteFile "C:\KPDTEST.TST" Unload Me End Sub