实现滚动字幕

Option Explicit
Dim content As String
Dim length As Long
Dim pos As Long

Private Sub Form_Load()
    '//预先设定要显示的内容
    content = "静夜思 作者：李白 床前明月光，疑是地上霜。举头望明月，低头思故乡。"
    '//获取内容长度
    length = Len(content)
    '//label1控件，手动调整，如图所示
    '//接着需要选择字体大小
    Set Me.Font = Label1.Font   '//方便借用Form.TextHeight方法
    Dim font_height As Long, font_width As Long, size As Long
    size = Label1.Font.size
    font_height = Me.TextHeight("床前明月光")
    font_width = Me.TextWidth("床前明月光")
    While font_height <= Label1.Height And font_width <= Label1.Width
        size = size + 1
        Label1.Font.size = size
        font_height = Me.TextHeight("床前明月光")
        font_width = Me.TextWidth("床前明月光")
    Wend
    Label1.Font.size = size - 1 '//选择最合适的字体大小
    pos = 1 '//从第一个字符开始读取
End Sub

Private Sub Command1_Click()
    Timer1.Interval = 1000   '1000毫秒执行一次
End Sub

Private Sub Timer1_Timer()
    Dim size As Long, temp As String
    '//每次显示5个长度单位的内容
    size = length - pos '//得到截取的长度大小
    If size < 4 Then    '//当不足5个长度单位时
        temp = Mid(content, pos, size + 1)
        temp = temp & Mid(content, 1, 4 - size)
        pos = 5 - size
    Else
        temp = Mid(content, pos, 5)
        pos = pos + 5
    End If
    Label1.Caption = temp  '//把截取的文本内容显示出来
End Sub