Detecting the Display Font Size

This article was contributed by chensu.


As you've probably seen, the end-user can specify their Font Size to be "Small Fonts", "Large Fonts" or "Custom Font" via the Control Panel's Display applet (Figure 1 below). Since this setting could adversely affect an application's user interface (UI), there are many times in more advanced applications where the knowledge of which setting has been chosen by the user would be useful. For example, this information can be used in determining which dialog to present (if you wanted to present a tailor-made dialog for each font size). In addition, knowing the currently selected font size could be used to give your application's end-user a warning had the UI been designed with only smaller fonts in mind. Whatever your need, this handly little function will assist you in programmatically determining the selected font size.

Figure 1 - Sometimes the end-user's choice of font size can wreak havoc with a carefully designed UI.

Function to Detect Font Size

The following code demonstrates how to detect it
CDC ScreenDC;
const int nLogDPIX = ScreenDC.GetDeviceCaps(LOGPIXELSX),
          nLogDPIY = ScreenDC.GetDeviceCaps(LOGPIXELSY);

if (nLogDPIX == 96 && nLogDPIY == 96)
 // 96 DPI, Small Fonts
 if (nLogDPIX == 120 && nLogDPIY == 120)
  // 120 DPI, Large Fonts
  // Otherwise, Custom Font Size


  • Is it possible to access other attribute?

    Posted by Legacy on 04/15/2003 12:00am

    Originally posted by: youngminister

    Is it possible to acess other attribute about font...
    I want to access "smooth output font" style..

  • set device caps?

    Posted by Legacy on 11/06/2002 12:00am

    Originally posted by: Kyle

    This is very helpful, but instead of writing code for both small fonts and large fonts, is there a way for the program to set the device caps to a specified value, say large fonts. There is a lot of work involved in writing code for both settings. Thank you.

  • But.....

    Posted by Legacy on 02/14/2002 12:00am

    Originally posted by: GEliyahu

    This example is fine and i like it.
    but my question is :
    if the user change CUSTOMIZE FONT, than how can i place my controls (using Create function)??
    i ask that because every time i change the font size i loose the coordinates of the control and get bad interface.
    Please help..

  • How can i detemine font size?

    Posted by Legacy on 04/26/2001 12:00am

    Originally posted by: stephan manukow


    how can i detect witch font size is selected
    in the property page "appearance" for each sreen


    Stephan Manukow

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