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How to get font size of your system?

Posted on 1998-08-31
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Last Modified: 2013-12-03
Any API call can give me the font size of my system? Font size you get when you click right mouse button on your screen and then select properties and then select setting tab.
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Question by:ames
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psdavis earned 400 total points
ID: 1321535
I believe it's

CDC::GetDeviceCaps( LOGPIXELSX );

It should return either 96 (normal) or 120 (large).


(if not logpixelsx, tell me, I got it somewhere)

Phillip
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by:jstolan
ID: 1321536
I don't believe psdavis is correct.  No GetDeviceCaps function will tell you the system font size.  One way to do it is to get a screen compatible display context using CreateDC.  Then get the system font using GetStockObject(SYSTEMFONT).  Load the font into the CDC using SelectObject.  Finally, you can use the GetTextMetrics call to determine any information you need, including the size.  Don't forget to free up everything correctly.
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Expert Comment

by:snoegler
ID: 1321537
The settings you need are stored in the registry:

1. Fetch the current configuration profile, stored here:

HKLM\System\CurrentControlSet\IDConfigDB\CurrentConfig

The value you get there is something like '0001'.

2. Using this value, the display dpi settings are stored here:

HKLM\Config\[ccfg]\Display\Settings
// [ccfg] <-- contains the value from [1]

The value names are:
DPILogicalX, DPILogicalY and
DPIPhysicalX, DPIPhysicalY

But i believe that psdavis is right. The way he proposed should deliver correct values, and
it doesn't depend on the registry.
BTW: The dpi settings *do* contain the system font size - as they tell how to scale the fonts.
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Expert Comment

by:psdavis
ID: 1321538
Thanks snoeg!
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Expert Comment

by:chensu
ID: 1321539
psdavis is correct. A complete version is:

CDC DispDC;
DispDC.CreateIC("DISPLAY", NULL, NULL, NULL);
int nLogDPIX = DispDC.GetDeviceCaps(LOGPIXELSX),
    nLogDPIY = DispDC.GetDeviceCaps(LOGPIXELSY);

// if (nLogDPIX == 96 && nLogDPIY == 96) // small fonts
// if (nLogDPIX == 120 && nLogDPIY == 120) // large fonts
// otherwise, custom font size

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Expert Comment

by:Answers2000
ID: 1321540
Well there's an easier way to get all font attributes

LOGFONT lf ;
GetObject( GetStockObject(SYSTEM_FONT), sizeof lf, &lf ) ;

*All* the font attributes are then in lf.
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Expert Comment

by:Answers2000
ID: 1321541
Sorry that was SDK, add casts and ::
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Author Comment

by:ames
ID: 1321542
psdavis was right. Snoegler's answer with registry works only for 95. For NT the entries are in different location. jstolan's answer may work, but I did not try it. Chensu, as always, makes it easier by providing a complete version. Thanks to you all.
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Author Comment

by:ames
ID: 1321543
PSDavis was right. Chensu, as always, makes it easier by providing complete solution. I did not try Jstolan's solution. Snoegler's solution works for 95. It means that you need to check for OS and then read different registry location based on OS. I used Chensu's solution and it works fine. Thanks to you all.
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