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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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GetDialogBaseUnits
The GetDialogBaseUnits function returns the dialog box base units used by Windows to create dialog
boxes. Both Windows and applications use these units to convert the width and
height of dialog boxes and controls from dialog units, as given in dialog box
templates, to pixels, and vice versa.
LONG GetDialogBaseUnits(VOID)
Parameters
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.
Remarks
The horizontal base unit 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. Furthermore, each horizontal base unit is equal to 4
horizontal dialog units; each vertical base unit is equal to 8 vertical dialog units.
Therefore, to convert dialog units to pixels, an application applies the
following formulas:
pixelX = (dialogunitX * baseunitX) / 4
pixelY = (dialogunitY * baseunitY) / 8
Similarly, to convert from pixels to dialog units, an application applies the
following formulas:
dialogunitX = (pixelX * 4) / baseunitX
dialogunitY = (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
MapDialogRect
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