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How to set print margin???

hho
hho asked
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Last Modified: 2010-04-04
I need to print the content of the RichEdit; how can I set the margin when print??  By default, the RichEdit.Print use the printer's default margin, how can I change that???
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Commented:
Do something like this:

  RichEdit1.PageRect :=
    Rect(MyLeftMargin, 0, Printer.PageHeight, Printer.PageWidth);
  RichEdit1.Print(...);

The values are set in pixels. This means that you have to watch
the pixelsperinch property.

In comctrls.pas (written by Borland) it is used like this:

procedure TCustomRichEdit.Print(const Caption: string);
var
  Range: TFormatRange;
  LastChar, MaxLen, LogX, LogY: Integer;
begin
  FillChar(Range, SizeOf(TFormatRange), 0);
  with Printer, Range do
  begin
    LogX := GetDeviceCaps(Handle, LOGPIXELSX);
    LogY := GetDeviceCaps(Handle, LOGPIXELSY);
    hdc := Handle;
    hdcTarget := hdc;
    if IsRectEmpty(PageRect) then
    begin
      rc.right := PageWidth * 1440 div LogX;
      rc.bottom := PageHeight * 1440 div LogY;
    end
    else begin
      rc.left := PageRect.Left * 1440 div LogX;
      rc.top := PageRect.Top * 1440 div LogY;
      rc.right := PageRect.Right * 1440 div LogX;
      rc.bottom := PageRect.Bottom * 1440 div LogY;
    end;
    rcPage := rc;
    Title := Caption;
    BeginDoc;
    LastChar := 0;
    MaxLen := GetTextLen;
    chrg.cpMax := -1;
    repeat
      chrg.cpMin := LastChar;
      LastChar := SendMessage(Self.Handle, EM_FORMATRANGE, 1, Longint(@Range));
      if (LastChar < MaxLen) and (LastChar <> -1) then NewPage;
    until (LastChar >= MaxLen) or (LastChar = -1);
    EndDoc;
  end;
  SendMessage(Handle, EM_FORMATRANGE, 0, 0);
end;

You'll figure it out!

/// John

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hho

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Commented:
For some reason this doesn't work on Windows NT 4.0.
The problem is that RichEdit can't even print in NT.
Any clue?
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