This document contains code for extracting files from RAR archives using the Unrar.dll library. It defines constants for error codes and operation types. Structures are defined for RAR header data and opening archive data. Functions are declared for opening, reading headers, processing files, and closing archives. The main extraction function handles opening the archive, reading headers, extracting or listing files, updating progress, checking for passwords or errors, and closing the archive.

1. Const
Const
Const
Const
Const
Const
Const
Const
Const
Const
Const
ERAR_END_ARCHIVE = 10
ERAR_NO_MEMORY = 11
ERAR_BAD_DATA = 12
ERAR_BAD_ARCHIVE = 13
ERAR_UNKNOWN_FORMAT = 14
ERAR_EOPEN = 15
ERAR_ECREATE = 16
ERAR_ECLOSE = 17
ERAR_EREAD = 18
ERAR_EWRITE = 19
ERAR_SMALL_BUF = 20
Const RAR_OM_LIST = 0
Const RAR_OM_EXTRACT = 1
Const RAR_SKIP = 0
Const RAR_TEST = 1
Const RAR_EXTRACT = 2
Const RAR_VOL_ASK = 0
Const RAR_VOL_NOTIFY = 1
Enum RarOperations
OP_EXTRACT = 0
OP_TEST = 1
op_list = 2
End Enum
Private Type RARHeaderData
ArcName As String * 260
FileName As String * 260
flags As Long
PackSize As Long
UnpSize As Long
HostOS As Long
FileCRC As Long
FileTime As Long
UnpVer As Long
Method As Long
FileAttr As Long
CmtBuf As String
CmtBufSize As Long
CmtSize As Long
CmtState As Long
End Type
Private Type RAROpenArchiveData
ArcName As String
OpenMode As Long
OpenResult As Long
CmtBuf As String
CmtBufSize As Long
CmtSize As Long
CmtState As Long
End Type
Private Declare Function RAROpenArchive Lib "unrar.dll" (ByRef ArchiveData As
RAROpenArchiveData) As Long
Private Declare Function RARCloseArchive Lib "unrar.dll" (ByVal hArcData As
Long) As Long
Private Declare Function RARReadHeader Lib "unrar.dll" (ByVal hArcData As Long,
ByRef HeaderData As RARHeaderData) As Long
Private Declare Function RARProcessFile Lib "unrar.dll" (ByVal hArcData As Long,
ByVal Operation As Long, ByVal DestPath As String, ByVal DestName As String) As

2. Long
Private Declare Sub RARSetChangeVolProc Lib "unrar.dll" (ByVal hArcData As Long,
ByVal mode As Long)
Private Declare Sub RARSetPassword Lib "unrar.dll" (ByVal hArcData As Long,
ByVal Password As String)
'above is the Unrar.Dll stuff, below is mine
'Dim FullPathToRar As String
Public
one go
Public
size
Public
change
Public
form
Public
Public
Public
Public
Public
Public
Password As String ' needed so that encrypted files can be decrypted in
TotalArchiveSize As Double 'used for progressbar, Total unpacked archive
PasswordStatus As Boolean ' test if theres a password so that user can't
page until one is supplied
CorruptFile As Boolean 'is tested when the user tries to select output
StopProcessing As Boolean
ArchiveObjects As Long
ArchiveObjectsStatic As Long
ExtractedObjects As Long
Lisx As ListItem
Colx As ColumnHeader
Public ArchiveComment As String
' here lieth my code to find filenames and whatnot
'aims: _
(tick) filename list _
(tick)packed and unpacked size _
(tick)progress bar _
(tick) Use of file flags more _
unrar "one" file (not sure its possible) _
(half tick)understand the Rar code more!!! _
(tick) read and display comments
Function RARExtract(ByVal ReqdFunction As String, ByVal sRARArchive As String,
Optional ByVal sDestPath As String, Optional ByVal sPassword As String, Optional
ByVal ReqdFolder) As Integer
' Description:' Exrtact file(s) from RAR archive.
'
'
'
'
Parameters:sRARArchive
sDestPath
sPassword
' Returns:' Integer
'
'
Dim
Dim
Dim
Dim
Dim
Dim
= RAR Archive filename
= Destination path for extracted file(s)
= Password [OPTIONAL]
= 0 Failed (no files, incorrect PW etc)
-1 Failed to open RAR archive
>0 Number of files extracted
lHandle As Long
lStatus As Long
uRAR As RAROpenArchiveData
uHeader As RARHeaderData
Ret As Long 'if not used, it only shows two items in the list
sStat As String ' the filename
Dim TheIcon As Integer
Dim PropFilename As String

3. Dim
Dim
Dim
Dim
Dim
Dim
PropFlags As String
PropPassword As Integer
PropFolder As String
PropComment As String
TotalUnpacked As Double
PropCarriesOn As Boolean
Dim Path As String
'PropComment = uHeader.flags And &H8
'MsgBox PropComment
'File count
ArchiveObjects = 0
ExtractedObjects = 0
If Mid(sRARArchive, Len(sRARArchive) - 3, 4) <> ".rar" Then 'if the ext on
fullpathtorar is .rar
'
MsgBox "You have bypassed the 'select only Rar Archive' function, you
cheeky monkey!" & vbCrLf & vbCrLf & "But I am smart and knew you would try!",
vbExclamation + vbOKOnly, "Not a Rar Archive"
Exit Function
End If
'displaying comments by frozenpea of vbcity.com
uRAR.CmtBuf = Space(16384)
uRAR.CmtBufSize = 16384
'Dim PropFileComp As Double
RARExtract = -1
' Open the RAR
uRAR.ArcName = sRARArchive
uRAR.OpenMode = RAR_OM_EXTRACT
lHandle = RAROpenArchive(uRAR) 'RAROpen(uRAR)
CorruptFile = False
' Failed to open RAR ?
If uRAR.OpenResult <> 0 Then
GoTo ErrDefs
'MsgBox "Corrupt File", vbCritical + vbOKOnly
'CorruptFile = True
'Exit Function
End If
' Password ?
If sPassword <> "" Then
RARSetPassword lHandle, sPassword
End If
' Extract file(s)...
' Is there at lease one archived file to extract ?
lStatus = RARReadHeader(lHandle, uHeader) 'RARReadHdr(lHandle, uHeader)
'/////////////////////////////

4. 'TotalUnpacked = 0
Do Until lStatus <> 0
DoEvents ' keep it responsive
If StopProcessing = True Then
frmProgress.lblProcessingFile.Caption = "Stopping. Please be
patient"
Exit Do 'exit loop early
End If
If ReqdFunction = "Extract" Then
'Process (extract) the current file within the archive
If RARProcessFile(lHandle, RAR_EXTRACT, "", sDestPath +
uHeader.FileName) = 0 Then
Debug.Print uHeader.flags And &H1
'Checks to see if the archive spans volumes, if it does, the
size is reported wrongly (size*no of volumes wrongly)
'if it does span volumes, don't count the size
PropCarriesOn = uHeader.flags And &H1
If PropCarriesOn = True Then
'do nothing
Else
TotalUnpacked = TotalUnpacked + uHeader.UnpSize 'how much
data has been currently extracted
ExtractedObjects = ExtractedObjects + 1
End If
'/////////// progress bar code
With frmScanVirus
.lblFileName = (Left(uHeader.FileName, InStr(1,
uHeader.FileName, vbNullChar) - 1))
If TotalArchiveSize <> 0 Then 'if its 0, will cause an error
+ if its 0, the archive unpacked is 0 which is daft
'
.lblProgress.Caption = CInt((TotalUnpacked /
TotalArchiveSize) * 100) & " %" 'change %age text
'
.lblFileNumber.Caption = ExtractedObjects & " / " &
ArchiveObjectsStatic
'
'frmOutput.Refresh 'needed to show the value thoughout
process
'
.ProgressBar1.Max = TotalArchiveSize 'set progressbar
to 100 max
'
.ProgressBar1.value = TotalUnpacked ' advance the
progressbar to how much has been unpacked
'
.ProgressBar2.Max = ArchiveObjectsStatic
'
.ProgressBar2.value = ExtractedObjects
'
Else
'
.ProgressBar1 = 100
'
.lblProgress = "100 %"
'
End If
End With
' Is there another archived file in this RAR ?
lStatus = RARReadHeader(lHandle, uHeader) 'generates a code, the
Defs are at the top.Allows exiting of loop 'RARReadHdr(lHandle, uHeader)
'below code checks if there is an error and exits the function
'IMPORTANT needs to be last otherwise it exits prematurely
ElseIf RARProcessFile(lHandle, RAR_EXTRACT, "", sDestPath +
uHeader.FileName) <> 0 Then 'extracts the rar archive 'RARProcFile(lHandle,
RAR_EXTRACT, "", sDestPath + uHeader.FileName) = 0 Then
Debug.Print RARProcessFile(lHandle, RAR_EXTRACT, "", sDestPath +
uHeader.FileName)

5. MsgBox "Unexpected end of archive", vbExclamation, "Error"
RARCloseArchive lHandle 'close archive
Exit Function
End If
'/////////////////////////////////
ElseIf ReqdFunction = "ObtainList" Then
'list file code
sStat = Left(uHeader.FileName, InStr(1, uHeader.FileName,
vbNullChar) - 1) 'allows listbox to have more than set of data. sStat is the
data for listbox
PropFlags = uHeader.flags
PropPassword = uHeader.flags And &H400 ' the password flag
If PropPassword = 0 Then
PropPassword = 0
ElseIf PropPassword > 0 Then 'check for password flag
PropPassword = 3 ' if the flag is set to true tell the user
PasswordStatus = True
End If
PropFolder = uHeader.flags And &HE0
'places the items in the archive into the listview and gives them
their proper icon
'
If PropFolder = &HE0 Then 'folder flag
'
TheIcon = PropPassword + 2
'
Else
'
TheIcon = PropPassword + 1
'
End If
'checks to see if it is a toplevel folder. Prevents errors with long
ass path code
'
If InStr(1, sStat, "") = 0 Then
'
'
frmScanVirus.lblFileName.Caption = sStat ' Set Lisx =
frmSource.ListView.ListItems.Add(, , sStat, TheIcon, TheIcon)
'
Else
'
frmScanVirus.lblFileName.Caption = sStat 'Set Lisx =
frmSource.ListView.ListItems.Add(, , Right(sStat, InStr(1, StrReverse(sStat),
"") - 1), TheIcon, TheIcon)
'
'
End If
'fill the listboxes properties up
'
Lisx.SubItems(1) = FilesSize(uHeader.PackSize)
'
Lisx.SubItems(2) = FilesSize(uHeader.UnpSize)
'
Lisx.SubItems(3) = ProcessDate(uHeader.FileTime)
'
Lisx.SubItems(4) = Hex(uHeader.FileCRC)
'
'checks to see if the object is a toplevel folder or not
'
Path = Left(sStat, InStr(1, sStat, Right(sStat, InStr(1,
StrReverse(sStat), ""))))
'
If Len(Path) = 1 Then Path = ""
'
Lisx.SubItems(5) = Path
'
Debug.Print "Carries on from before:"; PropFlags And &H1
PropCarriesOn = PropFlags And &H1
If PropCarriesOn = True Then
'do not add the file size to the total size

6. Else
TotalArchiveSize = TotalArchiveSize + uHeader.UnpSize 'calculate
uncompressed size
ArchiveObjects = ArchiveObjects + 1
ArchiveObjectsStatic = ArchiveObjects
ArchiveObjects
If TotalArchiveSize <> 0 Then
With frmScanVirus
.txtStatus.Text = "STATUS : [ Extracting file ... ]"
.lblFileName.Caption = sStat
.lblFileScan.Caption = ": " & JumlahFile +
End With
frmScanVirus.ProgScan.Max = TotalArchiveSize
frmScanVirus.ProgScan.value = TotalUnpacked
If IsVirus(sRARArchive) Then
With frmScanVirus.lstDetection.ListItems.Add(, ,
'
'
VirusDetect)
.SubItems(1) = sDestPath
.SubItems(2) = Format(FileLen(sDestPath) / 1024,
"###,####") & " KB"
.SubItems(3) = GetAttribute(sDestPath)
VirusDetect = VirusDetect
VirusDetected = VirusDetected + 1
frmScanVirus.lblVirusDetected.Caption = ": " &
VirusDetected
If DeleteAll = True Then
DeleteIt (sRARArchive)
VirusCleaned = VirusCleaned + 1
frmScanVirus.lblVirusClean.Caption = ": " &
VirusCleaned
Detected As: " & VirusDetect
End If
LogFile "Virus found
" & sRARArchive & "
End With
End If
End If
End If
Ret = RARProcessFile(lHandle, RAR_SKIP, "", "")
'FilesInArchive.List1.List(FilesInArchive.List1.ListCount - 1) =
FilesInArchive.List1.List(FilesInArchive.List1.ListCount - 1)
lStatus = RARReadHeader(lHandle, uHeader) 'SCROLLS THROUTH THE LIST
& gereates a code, defs are at top. Allows exiting of loop
'
frmSource.ListView.View = lvwReport
End If
'/////////////////////
'///////////////////////////////
Loop
'If ReqdFunction = "ObtainList" Then
''shows the comment if needed
'
Debug.Print "Comment:"; uRAR.CmtState
'
If uRAR.CmtState = 1 Then 'there is an archive comment so display it
'
ArchiveComment = uRAR.CmtBuf
'
'MsgBox ArchiveComment, vbOKOnly, "Archive Comment"
'
Else 'there isn't a comment so clear the "buffer"
'
ArchiveComment = ""
'
End If
'End If

7. '
''filenames are encrypted?
'
If lStatus = 21 Then
'
MsgBox "Filenames encrypted. To see the filenames, enter a password
in the 'Password' box" _
'
& vbCrLf & vbCrLf & "then click on the 'Reload Archive Data' button
at the bottom of window ", vbInformation + vbOKOnly
'
PasswordStatus = True
'
End If
' Close the RAR
RARCloseArchive lHandle 'RARClose lHandle
' Return
RARExtract = iFileCount
If PasswordStatus = True Then
'bottom lines enables the password field
'
frmSource.txtPassword.Visible = True
'
frmSource.lblpassword.Visible = True
'
frmSource.btnPasswordHelp.Visible = True
'
frmSource.btnReload.Enabled = True
'frmSource.txtPassword.BackColor = vbWhite
End If
Exit Function
ErrDefs:
'Select Case uRAR.OpenResult
'
Case 10
'
MsgBox "Unexpected End of Archive", vbExclamation + vbOKOnly, "Error
code 10"
'
Case 11
'
MsgBox "Not enough memory to open the archive", vbOKOnly +
vbExclamation, "Error code 11"
'
Case 12
'
MsgBox "The archive header corrupt or damaged", vbOKOnly + vbCritical,
"Error code 12"
'
CorruptFile = True
'
'
Case 13
'
MsgBox "The archive is corrupt or damaged", vbOKOnly + vbCritical,
"Error code 13"
'
CorruptFile = True
'
Case 14
'
MsgBox "The Comment is in an unknown format", vbExclamation + vbOKOnly,
"Error code 14"
'
Case 15
'
MsgBox "There was an error that occured when the archive was opened",
vbOKOnly + vbCritical, "Error code 15"
'
Case 16
'
MsgBox "There was an error when the file was created", vbCritical +
vbOKOnly, "Error code 16"
'
Case 17
'
MsgBox "There was an error closing the archive meaning it is still in
the memory. Please terminate the De-rar.exe process to claim this memory space
back", vbCritical + vbOKOnly, "Error code 17"
'End Select
RARCloseArchive lHandle 'close archive
End Function