EM_SETZOOM message
Sets the zoom ratio for a multiline edit control or a rich edit control. The ratio must be a value between 1/64 and 64. The edit control needs to have the ES_EX_ZOOMABLE extended style set, for this message to have an effect, see Edit Control Extended Styles.
Parameters
-
wParam
-
Numerator of the zoom ratio.
-
lParam
-
Denominator of the zoom ratio. These parameters can have the following values.
Value Meaning - Both 0
Turns off zooming by using the EM_SETZOOM message (zooming may still occur using 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.
Remarks
Edit: Supported in Windows 10 1809 and later. The edit control needs to have the ES_EX_ZOOMABLE extended style set, for this message to have an effect, see Edit Control Extended Styles. For information about the edit control, see Edit Controls.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2003 [desktop apps only] |
| Redistributable |
Rich Edit 3.0 |
| Header |
|