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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Mar 31, 2001



Application Security Testing: An Integral Part of DevOps

TextBoxGetLine - Return a single line in a multiline TextBox control

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

' Return the specified line in a multiline TextBox control.

Function TextBoxGetLine(tb As TextBox, ByVal lineNum As Long) As String
    Dim charOffset As Long, lineLen As Long
    ' Retrieve the character offset of the first character of the line.
    charOffset = SendMessage(tb.hwnd, EM_LINEINDEX, lineNum, ByVal 0&)
    ' Now it is possible to retrieve the length of the line.
    lineLen = SendMessage(tb.hwnd, EM_LINELENGTH, charOffset, ByVal 0&)
    ' Extract the line text.
    TextBoxGetLine = Mid$(tb.Text, charOffset + 1, lineLen)
End Function
Francesco Balena
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