'add a textbox with "multiline=true","scrollbars=2".
Private Declare Function SendMessage Lib "USER32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Const EM_GETLINECOUNT = &HBA
Private Sub Form_Click()
Dim linecount As Long
linecount = SendMessage(Text1.hWnd, EM_GETLINECOUNT, 0, 0) '返回行数
MsgBox "Textbox1 中的字符串有 " & linecount & " 行!"
End Sub
Private Sub Form_Load()
Dim x As String
x = String(100, "x")
x = Replace(x, "x", "CSDN")
Text1.Text = x
End Sub