MagGetImageScalingCallback function (magnification.h)

Article
10/13/2021

Note The MagGetImageScalingCallback function is deprecated in Windows 7 and later, and should not be used in new applications. There is no alternate functionality.

Retrieves the registered callback function that implements a custom transform for image scaling.

Syntax

MagImageScalingCallback MagGetImageScalingCallback(
  [in] HWND hwnd
);

Parameters

[in] hwnd

Type: HWND

The magnification window.

Return value

Type: MagImageScalingCallback

Returns the registered MagImageScalingCallback callback function, or NULL if no callback is registered.

Remarks

This function returns NULL if Windows Display Driver Model (WDDM) is not supported.

This function works only when Desktop Window Manager (DWM) is off.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	magnification.h
Library	Magnification.lib
DLL	Magnification.dll