EM_SETZOOM Message

The EM_SETZOOM message sets the zoom ratio anywhere between 1/64 and 64.

Syntax

To send this message, call the SendMessage function as follows.


lResult = SendMessage(
    // returns LRESULT in lResult
   (HWND) hWndControl,
    // handle to destination control
   (UINT) EM_SETZOOM,
    // message ID
   (WPARAM) wParam,
    // = (WPARAM) () wParam;
   (LPARAM) lParam
    // = (LPARAM) () lParam;

);

Parameters

wParam
Numerator of the zoom ratio.
lParam
Denominator of the zoom ratio. These parameters can have the following values.
Both 0
Turns off zooming by using the EM_SETZOOM message (zooming may still occur using ITextHost::TxGetExtent).
1/64 < (wParam / lParam) < 64
Zooms display by the zoom ratio numerator/denominator

Return Value

If the new zoom setting is accepted, the return value is TRUE.
If the new zoom setting is not accepted, the return value is FALSE.

Message Information

Header Declared in Richedit.h
Minimum operating systems Windows 95 with Rich Edit 3.0, Windows NT 4.0 with Rich Edit 3.0, Windows Millennium Edition, Windows 2000