C++ Windows API - How to retrieve font scaling percentage
See the question and my original answer on StackOverflowFor the "Make everything bigger" section, you can use GetScaleFactorForMonitor
Gets the scale factor of a specific monitor.
For the "Make text bigger" section, you can use a WinRT static property: UISettings.TextScaleFactor
Gets the value of the system text size setting.
Otherwise the latter can also be read using the TextScaleFactor
DWORD attribute in the HKEY_CURRENT_USER\SOFTWARE\Microsoft\Accessibility
registry key (but this is not officially documented).