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Posted 25 Oct 2002

Detecting the Display Font Size

, 25 Oct 2002
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Simple function to enable you to programmatically detect the user-selected font at runtime.


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.

Font Size of Display Properties
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


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About the Author

Chen Su
Software Developer
Canada Canada
No Biography provided

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Comments and Discussions

GeneralMy vote of 1 Pin
Tuan Dang26-Jun-09 5:05
memberTuan Dang26-Jun-09 5:05 
GeneralFor C# Pin
Chizik16-Feb-09 22:38
memberChizik16-Feb-09 22:38 
GeneralRe: For C# Pin
Chen Su17-Feb-09 8:58
memberChen Su17-Feb-09 8:58 
GeneralRe: For C# Pin
Chen Su17-Feb-09 17:38
memberChen Su17-Feb-09 17:38 
GeneralRe: For C# Pin
Chizik17-Feb-09 22:45
memberChizik17-Feb-09 22:45 
Generalfonts Pin
Daúde Dulla25-Jan-05 14:38
memberDaúde Dulla25-Jan-05 14:38 
GeneralRe: fonts Pin
Chen Su25-Jan-05 19:50
memberChen Su25-Jan-05 19:50 
GeneralWhy this doesn't always work.... from MS... Pin
kaladorn14-Oct-04 9:51
memberkaladorn14-Oct-04 9:51 
QuestionHow to find font size if i have TEXTMETRIC of CDC with me????? Pin
vinubhai26-Apr-04 23:38
membervinubhai26-Apr-04 23:38 
GeneralDoesn't work in XP Pin
Navin14-Jul-03 8:01
memberNavin14-Jul-03 8:01 
GeneralRe: Doesn't work in XP Pin
Chen Su14-Jul-03 13:23
memberChen Su14-Jul-03 13:23 
GeneralRe: Doesn't work in XP Pin
Navin15-Jul-03 2:59
memberNavin15-Jul-03 2:59 
GeneralRe: Doesn't work in XP Pin
Chen Su15-Jul-03 6:59
memberChen Su15-Jul-03 6:59 
GeneralRe: Doesn't work in XP Pin
Navin15-Jul-03 8:56
memberNavin15-Jul-03 8:56 
GeneralRe: Doesn't work in XP Pin
Clifford T. Hall3-Oct-03 10:19
memberClifford T. Hall3-Oct-03 10:19 
GeneralRe: Doesn't work in XP Pin
Tuan Dang26-Jun-09 10:14
memberTuan Dang26-Jun-09 10:14 
QuestionHow to edit the program to set the display font size? Pin
Fuji Chuang18-Feb-03 21:45
memberFuji Chuang18-Feb-03 21:45 
Questionhow to force a CDialog to normal Pin
Nic Wilson22-Jan-03 19:50
memberNic Wilson22-Jan-03 19:50 
AnswerRe: how to force a CDialog to normal Pin
Chen Su22-Jan-03 20:09
memberChen Su22-Jan-03 20:09 

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