EM_CHARFROMPOS in RichEdit
in [Visual Basic]
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From: Jan Opitz on 2 Feb 2009 09:22 Hello, I am trying to get the character next to the mouseup position using pointapi and sending CHARFROMPOS. This works fine with a RichTextBox, but with with Morcillo's RichEdit pos is 0 whatever line I place the cursor. Also, x and y are far from precise. Since I am processing double byte chars I would not like to switch to MS controls. Any suggestions? Jan Declaration and main code: Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long Public Type POINTAPI x As Long y As Long End Type Public Const EM_CHARFROMPOS& = &HD7 Private Function GetWord(rich1 As RichEdit, ByVal x&, ByVal y&) As String MPointer.x = x \ Screen.TwipsPerPixelX MPointer.y = y \ Screen.TwipsPerPixelY Pos = SendMessage(rich1.hwnd, EM_CHARFROMPOS, 0&, (MPointer.x + MPointer.y * &H10000))
From: mayayana on 2 Feb 2009 14:01 The last parameter is a POINTAPI or PONIT structure. You seem to be sending a numeric value. Also, the offset is relative the the RTB. If Eduardo Morcillo's RTB doesn't give you those values then you have to calculate them. The following is an example of getting the bottom visible line by getting the character offset of the first character in that line: '----------------------------------------- Dim R1 As RECT Dim Pt1 As POINT Dim LRet As Long, CPos As Long '-- get the window rect. LRet = SendMessageAny(hRTB, EM_GETRECT, 0&, R1) '-- set up POINT to accord with bottom left-hand corner of RTB. Pt1.X = 1 Pt1.Y = (R1.Bottom - R1.Top) - 1 '-- get character offset. LRet = SendMessageAny(hRTB, EM_CHARFROMPOS, 0&, Pt1) '-- returns bottom visible line number. BottomLine = SendMessageLong(hRTB, EM_EXLINEFROMCHAR, 0&, LRet) '------------------------------------------- Note that the docs say EM_CHARFROMPOS returns the nearest char. offset in the low word and the nearest line number in the high word. That info. seems to be either outdated or just wrong. As far as I can tell, the return value is just the char. offset. (Which makes sense. If it were the low word then only 65000-odd characters could be counted.) > Hello, > > I am trying to get the character next to the mouseup position using pointapi > and sending CHARFROMPOS. > This works fine with a RichTextBox, but with with Morcillo's RichEdit pos is > 0 whatever line I place the cursor. > Also, x and y are far from precise. Since I am processing double byte chars > I would not like to switch to > MS controls. > > Any suggestions? > > Jan > > > Declaration and main code: > > Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal > hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As > Long > Public Type POINTAPI > x As Long > y As Long > End Type > Public Const EM_CHARFROMPOS& = &HD7 > > Private Function GetWord(rich1 As RichEdit, ByVal x&, ByVal y&) As String > > MPointer.x = x \ Screen.TwipsPerPixelX > MPointer.y = y \ Screen.TwipsPerPixelY > Pos = SendMessage(rich1.hwnd, EM_CHARFROMPOS, 0&, (MPointer.x + > MPointer.y * &H10000)) > >
From: Jan Opitz on 2 Feb 2009 16:22 Thank you, this helped me a lot for clarification. The problem with the calculation is that y would vary with different fontsizes being used within the same text. So I cannot find out easily in which line I am. It is quite convenient to get the character position with a RTB. But I assume there is no other way that would make it easier to find the line. Regards Jan "mayayana" <mayaXXyana(a)rcXXn.com> schrieb im Newsbeitrag news:uqWMpgWhJHA.1248(a)TK2MSFTNGP03.phx.gbl... > The last parameter is a POINTAPI or PONIT > structure. You seem to be sending a numeric > value. Also, the offset is relative the the RTB. > If Eduardo Morcillo's RTB doesn't give you > those values then you have to calculate them. > > The following is an example of getting the bottom > visible line by getting the character offset of the > first character in that line: > > '----------------------------------------- > > Dim R1 As RECT > Dim Pt1 As POINT > Dim LRet As Long, CPos As Long > '-- get the window rect. > LRet = SendMessageAny(hRTB, EM_GETRECT, 0&, R1) > > '-- set up POINT to accord with bottom left-hand corner of RTB. > Pt1.X = 1 > Pt1.Y = (R1.Bottom - R1.Top) - 1 > > '-- get character offset. > LRet = SendMessageAny(hRTB, EM_CHARFROMPOS, 0&, Pt1) > > '-- returns bottom visible line number. > BottomLine = SendMessageLong(hRTB, EM_EXLINEFROMCHAR, 0&, LRet) > > '------------------------------------------- > > Note that the docs say EM_CHARFROMPOS returns the nearest > char. offset in the low word and the nearest line number in the > high word. That info. seems to be either outdated or just wrong. > As far as I can tell, the return value is just the char. offset. > (Which makes sense. If it were the low word then only 65000-odd > characters could be counted.) > >> Hello, >> >> I am trying to get the character next to the mouseup position using > pointapi >> and sending CHARFROMPOS. >> This works fine with a RichTextBox, but with with Morcillo's RichEdit pos > is >> 0 whatever line I place the cursor. >> Also, x and y are far from precise. Since I am processing double byte > chars >> I would not like to switch to >> MS controls. >> >> Any suggestions? >> >> Jan >> >> >> Declaration and main code: >> >> Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" > (ByVal >> hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As >> Long >> Public Type POINTAPI >> x As Long >> y As Long >> End Type >> Public Const EM_CHARFROMPOS& = &HD7 >> >> Private Function GetWord(rich1 As RichEdit, ByVal x&, ByVal y&) As String >> >> MPointer.x = x \ Screen.TwipsPerPixelX >> MPointer.y = y \ Screen.TwipsPerPixelY >> Pos = SendMessage(rich1.hwnd, EM_CHARFROMPOS, 0&, (MPointer.x + >> MPointer.y * &H10000)) >> >> > >
From: mayayana on 2 Feb 2009 18:39 > The problem with the calculation is that y > would vary with different fontsizes being used within the same > text. So I cannot find out easily in which line I am. > It is quite convenient to get the character position > with a RTB. > But I assume there is no other way that would make it easier to > find the line. > I don't understand. I thought that you wanted to know what character offset is nearest where the mouse clicked. Doesn't EM_CHARFROMPOS do that, regardless of font size? Maybe you should explain what you're trying to accomplish.
From: "Bill McCarthy" TPASoft.com Are Identity on 2 Feb 2009 22:20
Hi Jan, If you are using the mouse up, unless you intervene, the selection has been set. In which case you really only need to call EM_LINEFROMCHAR passing in -1 as the wParam. That will give you the line index of the selection. "Jan Opitz" <next1NO(a)SPAMgmx.de> wrote in message news:ec80CHUhJHA.3444(a)TK2MSFTNGP03.phx.gbl... > Hello, > > I am trying to get the character next to the mouseup position using > pointapi and sending CHARFROMPOS. > This works fine with a RichTextBox, but with with Morcillo's RichEdit pos > is 0 whatever line I place the cursor. > Also, x and y are far from precise. Since I am processing double byte > chars I would not like to switch to > MS controls. > > Any suggestions? > > Jan > > > Declaration and main code: > > Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" > (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As > Any) As Long > Public Type POINTAPI > x As Long > y As Long > End Type > Public Const EM_CHARFROMPOS& = &HD7 > > Private Function GetWord(rich1 As RichEdit, ByVal x&, ByVal y&) As String > > MPointer.x = x \ Screen.TwipsPerPixelX > MPointer.y = y \ Screen.TwipsPerPixelY > Pos = SendMessage(rich1.hwnd, EM_CHARFROMPOS, 0&, (MPointer.x + > MPointer.y * &H10000)) > > |