Introduction
Repair DBF files corrupted by any cause, like Power failer, or abnormally PC shutdown
Background
Usually when power fails and that time the DBF file is in use, the DBF file corrupts and when you try to open the file, It give the message Not a Database file.
Using the code
Before you start add OpenFileDialog component and Activex Data Component References to your project. and assign below Local variables at Form Level.
Dim byteArray As Variant
Dim dblNoOfRecords As Double
Dim dblHeaderLength As Double
Dim dblRecordLength As Double
Dim dblActualRecords As Double
In OpenDialog Open Click event write below code. The code will first check whether the DBF file is corrupted Or Not. If it is corrupted then Repair DBF Button will set to True. Otherwise "No Error in Database" message displays on screen.
Private Sub cmdOpen_Click()
DialogBox.DialogTitle = "Select DBF File"
DialogBox.Filter = "DBF Files|*.dbf"
DialogBox.DefaultExt = "dbf"
DialogBox.ShowOpen
If Trim(DialogBox.FileName) <> "" Then
txtFileName.Text = DialogBox.FileName
Dim objStream As New ADODB.Stream
objStream.Type = adTypeBinary
objStream.Open
objStream.LoadFromFile Trim(DialogBox.FileName)
byteArray = objStream.Read()
dblNoOfRecords = byteArray(4) + byteArray(5) * 256 + byteArray(6) * 256 ^ 2 + byteArray(7) * 256 ^ 3
dblHeaderLength = byteArray(8) + byteArray(9) * 256
dblRecordLength = byteArray(10) + byteArray(11) * 256
dblActualRecords = Int((objStream.Size - dblHeaderLength) / dblRecordLength)
If dblNoOfRecords > dblActualRecords Then
cmdRepair.Visible = True
Label2.Caption = "Error Found... Click on Repair Database"
Else
'cmdRepair.Enabled = False
'cmdRepair.Caption = "No Error in Database"
Label2.Caption = "No Error in Database"
End If
Set objStream = Nothing
End If
'showerror:
' MsgBox "Error Description : " & Err.Description & Chr(13) & _
' "Error Number : " & Err.Number
End Sub
Copy below code in Repair Click Event.
Private Sub cmdRepair_Click()
Dim objStream As New ADODB.Stream
objStream.Type = adTypeBinary
objStream.Open
byteArray(4) = dblActualRecords Mod 256
byteArray(5) = Int(dblActualRecords / 256) Mod 256
byteArray(6) = Int(dblActualRecords / 256 ^ 2) Mod 256
byteArray(7) = Int(dblActualRecords / 256 ^ 3) Mod 256
objStream.Write byteArray
objStream.SaveToFile Trim(DialogBox.FileName), adSaveCreateOverWrite
objStream.Close
cmdRepair.Visible = False
Set objStream = Nothing
Label2.Caption = "Repair Succesfully Completed"
End Sub
Summary
Very usefull Utility to recover your Data at any moment.
About Bhaskar Shetty
BCA (Bachelor of computer application) more than 8+ years exprience in Software Development / Analyst / Implementation
