Windows API Guide: CreatePolygonRgn Function

Platforms

Windows 95: Supported.
Windows 98: Supported.
Windows NT: Requires Windows NT 3.1 or later.
Windows 2000: Supported.
Windows CE: Requires Windows CE 1.0 or later.

Description & Usage

The EM_GETSEL message identifies what text is currently selected in an edit control. The message effectively gives the character positions of the beginning and end of the selection.

Return Value

The message returns the start and end positions of the text selection, packed into a single 32-bit integer. The low-order word contains the starting position of the selection and the high-order word contains the position of the first character after the selection. However, it is easier to use the values placed into wParam and lParam to read the selection instead of using the return value.

Visual Basic-Specific Issues

None.

Parameters

wParam: Receives the zero-based position of the first character in the selection.
lParam: Receives the zero-based position of the character immediately after the end of the selection.

Constant Definitions

Const EM_GETSEL = &HB0

Example

' This code is licensed according to the terms and conditions listed here. ' Declarations and such needed for the example: ' (Copy them to the (declarations) section of a module.) Public Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hWnd _ As Long, ByVal Msg As Long, wParam As Any, lParam As Any) As Long Public Const EM_GETSEL = &HB0 ' Display the selected text in edit control Text1.  This is done by sending messages ' to get the selection, and then accessing the control's .Text property to read its contents. Dim startpos As Long   ' starting position of the selection Dim endpos As Long     ' ending position of the selection Dim retval As Long     ' return value Dim seltext As String  ' the selected text ' Figure out where the selection in Text1 is. retval = SendMessage(Text1.hWnd, EM_GETSEL, startpos, endpos) ' Now isolate that selection from the entire text and display it. If startpos <> endpos Then seltext = Mid(Text1.Text, startpos + 1, endpos - startpos) Debug.Print "Text selection: "; seltext Else Debug.Print "No selection." End If