Determine the current line in a multiline TextBox control

You can determine the line where the caret is in a multiline TextBox control by sending the control a EM_LINEFROMCHAR message, as follows:


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
Const EM_LINEFROMCHAR = &HC9

Function GetTextBoxCurrentLine(TB As TextBox) As Long
   GetTextBoxCurrentLine = SendMessage(TB.hWnd, EM_LINEFROMCHAR, -1, _
       ByVal 0&) + 1
End Function

For example:


Print "Caret is on line " & GetTextBoxCurrentLine(Text1.hWnd)

Marco Bellinaso

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