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Detecting the Display Font Size

By , 25 Oct 2002
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Introduction

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;
VERIFY(ScreenDC.CreateIC(_T("DISPLAY"), NULL, NULL, NULL));
const int nLogDPIX = ScreenDC.GetDeviceCaps(LOGPIXELSX),
          nLogDPIY = ScreenDC.GetDeviceCaps(LOGPIXELSY);

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

License

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About the Author

Chen Su
Software Developer
Canada Canada
No Biography provided

Comments and Discussions

 
GeneralMy vote of 1 PinmemberTuan Dang26-Jun-09 5:05 
GeneralFor C# PinmemberChizik16-Feb-09 22:38 
GeneralRe: For C# PinmemberChen Su17-Feb-09 8:58 
GeneralRe: For C# PinmemberChen Su17-Feb-09 17:38 
GeneralRe: For C# PinmemberChizik17-Feb-09 22:45 
Generalfonts PinmemberDaúde Dulla25-Jan-05 14:38 
GeneralRe: fonts PinmemberChen Su25-Jan-05 19:50 
GeneralWhy this doesn't always work.... from MS... Pinmemberkaladorn14-Oct-04 9:51 
QuestionHow to find font size if i have TEXTMETRIC of CDC with me????? Pinmembervinubhai26-Apr-04 23:38 
GeneralDoesn't work in XP PinmemberNavin14-Jul-03 8:01 
GeneralRe: Doesn't work in XP PinmemberChen Su14-Jul-03 13:23 
GeneralRe: Doesn't work in XP PinmemberNavin15-Jul-03 2:59 
GeneralRe: Doesn't work in XP PinmemberChen Su15-Jul-03 6:59 
GeneralRe: Doesn't work in XP PinmemberNavin15-Jul-03 8:56 
GeneralRe: Doesn't work in XP PinmemberClifford T. Hall3-Oct-03 10:19 
GeneralRe: Doesn't work in XP PinmemberTuan Dang26-Jun-09 10:14 
QuestionHow to edit the program to set the display font size? PinmemberFuji Chuang18-Feb-03 21:45 
Questionhow to force a CDialog to normal PinmemberNic Wilson22-Jan-03 19:50 
AnswerRe: how to force a CDialog to normal PinmemberChen Su22-Jan-03 20:09 

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