Class App Inherits Application

Const kEditClear = "&Löschen"

Const kFileQuit = "Beenden"

Const kFileQuitShortcut = ""

EventHandler Sub Open() // a test function with subclass functions.Append New TestFunction // and one with handler Dim f As New SQLiteFunctionMBS f.name = "SHA256" f.ArgumentCount = 1 f.Flags = f.kFlagDeterministic OR f.kFlagUTF8 OR f.kFlagInnocuous // Text encoding UTF8, function is deterministic and can be cached, function is innocuous as it depends only on parameters AddHandler f.Perform, AddressOf PerformSHA256 functions.Append f // this test is with Xojo's SQLite version! Dim db As New SQLiteDatabase db.LoadExtensions = True // no database name, so in-memory database If db.Connect Then // query path for loading extension Dim path As String = InternalSQLiteLibraryMBS.path // Load MBS SQLite plugin as extension Dim sql As String = "SELECT load_extension ('"+path+"', 'sqlite3_extension_init')" db.SQLExecute sql // try our Test function Dim r As RecordSet = db.SQLSelect("SELECT test()") if r = nil or r.eof then MsgBox "Failed to query version." else MsgBox "Test function returned: "+r.IdxField(1).StringValue End If // try our SHA256 function r = db.SQLSelect("SELECT hex(SHA256(""Hello World""))") If r = Nil Or r.eof Then MsgBox "Failed to query version." Else MsgBox "SHA256 function returned: "+r.IdxField(1).StringValue End If // should show A591A6D40BF420404A011733CFB7B190D62C65BF0BCDA32B57B277D9AD9F146E end if End EventHandler

Sub PerformSHA256(f as SQLiteFunctionMBS, ArgumentCount as Integer, Arguments() as Variant) #Pragma BackgroundTasks False #Pragma BoundsChecking False #Pragma StackOverflowChecking False Try Dim a As Variant = Arguments(0) Dim mem As MemoryBlock If a IsA MemoryBlock Then mem = a Else mem = a.StringValue End If Dim Hash As MemoryBlock = Crypto.SHA2_256(mem) f.ResultBlob hash Catch r As RuntimeException f.ResultError "Exception: "+r.message End Try End Sub

Property Functions() As SQLiteFunctionMBS

End Class

MenuBar MenuBar1

MenuItem FileMenu = "&Ablage"

MenuItem FileQuit = "#App.kFileQuit"

MenuItem EditMenu = "&Bearbeiten"

MenuItem EditUndo = "&Rückgängig"

MenuItem UntitledMenu1 = "-"

MenuItem EditCut = "&Ausschneiden"

MenuItem EditCopy = "&Kopieren"

MenuItem EditPaste = "&Einfügen"

MenuItem EditClear = "#App.kEditClear"

MenuItem UntitledMenu0 = "-"

MenuItem EditSelectAll = "&Alles auswählen"

End MenuBar

Sign

End Sign

Class TestFunction Inherits SQLiteFunctionMBS

EventHandler Sub Perform(ArgumentCount as Integer, Arguments() as Variant) #Pragma BackgroundTasks False #Pragma BoundsChecking False #Pragma StackOverflowChecking False ResultText "Hello World" End EventHandler

Sub Constructor() // Calling the overridden superclass constructor. Super.Constructor Me.Name = "Test" Me.ArgumentCount = 0 Me.Flags = Me.kFlagUTF8 OR Me.kFlagDeterministic OR Me.kFlagInnocuous // Text encoding UTF8, function is deterministic and can be cached, function is innocuous as it depends only on parameters End Sub

End Class