How to scale font sizes based on current DPI settings in VC++/MFC applications?

Question

How to scale font sizes based on current DPI settings in VC++/MFC applications ?

As of now when I change the DPI from 100% yo 150% the font sizes remain the same, although the icons will scale down based on the current dpi ..

Please suggest the best way for above problem.

Answer 1

In Windows Vista and 7, the OS tries to hide the DPI from your program and does adjustments behind the scenes. If you want your program to react properly to DPI changes you must follow the guidelines from Microsoft titled Creating a DPI-Aware Application .

Answer 2

By specifying the text and control sizes in DLU's. That happens by default though, so I assume you are generating dialogs dynamically or from a memory-based DLGTEMPLATE. If you, you're (pardon my French) screwed, because you'll have to muck about with converting DLU's to pixels, a very painful and tedious process. Read the following KB articles:

• http://support.microsoft.com/default.aspx?scid=kb;en-us;125681

• http://support.microsoft.com/default.aspx?scid=kb;en-us;145994

Answer 3

Don't use DPI for font scaling. Instead, use the settings the user has configured in the "Appearance" section of Control Panel.

You might also want to consider making the font size configurable for just your application.