Backup/Restore SQLite file

[mohsen1230 0]

با سلام خدمت دوستان برنامه من هنگام restore خطا میگیره مبتدی هستم . مشکل از کجاست

#Region  Project Attributes
    #ApplicationLabel: B4A Example
    #VersionCode: 1
    #VersionName:
    'SupportedOrientations possible values: unspecified, landscape or portrait.
    #SupportedOrientations: unspecified
    #CanInstallToExternalStorage: False
#End Region

#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: True
#End Region

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.

End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.
    'Database
    Dim SQL1 As SQL
    Dim DBFileDir As String         : DBFileDir = File.DirDefaultExternal
    Dim DBFileName As String      : DBFileName = "mydb.s3db"
    Dim DBFileBak As String         : DBFileBak = "mydb.bak"
    
End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    Activity.LoadLayout("mm")

End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

'    File.Copy(File.DirAssets,"mm.db",File.DirInternal,MPD.PersianShortDate&".db")
Sub Button1_Click
    SQL1.Close
    File.Copy(File.DirAssets, "mm.db", File.DirInternal, "mm.db")
    SQL1.Initialize(File.DirRootExternal, "mm.db", True)
    Msgbox("Database has been Backed Up", "")
End Sub

Sub Button2_Click
    
    SQL1.Close
    File.Copy(File.DirAssets, "mm.db", File.DirAssets, "mm.db")
    SQL1.Initialize(File.DirRootExternal, "mm.db", True)
    Msgbox("Database has been Restored", "")

End Sub