please dont rip this site Prev Next

GetDialogBaseUnits info  Overview  Group

The GetDialogBaseUnits function returns the system's dialog base units, which are the average width and height of characters in the system font. For dialog boxes that use the system font, you can use these values to convert between dialog template units, as specified in dialog box templates, and pixels. For dialog boxes that do not use the system font, the conversion from dialog template units to pixels depends on the font used by the dialog box.

For either type of dialog box, it is easier to use the MapDialogRect function to perform the conversion. MapDialogRect takes the font into account and correctly converts a rectangle from dialog template units into pixels.

LONG GetDialogBaseUnits(VOID)


This function has no parameters.

Return Values

The return value is a 32-bit value that contains the dialog base units. The low-order word of the return value contains the horizontal dialog box base unit, and the high-order word contains the vertical dialog box base unit.


The horizontal base unit returned by GetDialogBaseUnits is equal to the average width, in pixels, of the characters in the system font; the vertical base unit is equal to the height, in pixels, of the font.

For a dialog box that does not use the system font, the base units are the average width and height, in pixels, of the characters in the dialog’s font. You can use the GetTextMetrics and GetTextExtentPoint32 functions to calculate these values for a selected font. However, by using the MapDialogRect function, you can avoid errors that might result if your calculations differ from those performed by the system.

Each horizontal base unit is equal to 4 horizontal dialog template units; each vertical base unit is equal to 8 vertical dialog template units. Therefore, to convert dialog template units to pixels, use the following formulas:

pixelX = (templateunitX * baseunitX) / 4 

pixelY = (templateunitY * baseunitY) / 8 


Similarly, to convert from pixels to dialog template units, use the following formulas:

templateunitX = (pixelX * 4) / baseunitX 

templateunitY = (pixelY * 8) / baseunitY 


The multiplication is performed before the division to avoid rounding problems if base units are not divisible by 4 or 8.

See Also



file: /Techref/os/win/api/win32/func/src/f30_12.htm, 3KB, , updated: 2001/6/26 11:21, local time: 2024/6/21 13:19,

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> GetDialogBaseUnits</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2024 contributors:
o List host: MIT, Site host, Top posters @none found
- Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.

Welcome to!