MapDialogRect
The MapDialogRect
function converts (maps) the specified dialog box units to screen units
(pixels). The function replaces the coordinates in the specified RECT structure with the
converted coordinates, which allows the structure to be used to create a dialog
box or position a control within a dialog box.
BOOL MapDialogRect(
|
HWND hDlg, |
// handle of dialog
box |
|
LPRECT lpRect |
// address of
structure with rectangle |
|
); |
|
Parameters
hDlg
Identifies a
dialog box. This function accepts only handles for dialog boxes created by one
of the dialog box creation functions; handles for other windows are not valid.
lpRect
Points to a RECT
structure that contains the dialog box coordinates to be converted.
Return Values
If the
function succeeds, the return value is nonzero.
If the
function fails, the return value is zero.
Remarks
The MapDialogRect
function assumes that the initial coordinates in the RECT structure represent dialog
box units. To convert these coordinates from dialog box units to pixels, the
function retrieves the current horizontal and vertical base units for the
dialog box, then applies the following formulas:
left =
(left * baseunitX) / 4
right =
(right * baseunitX) / 4
top =
(top * baseunitY) / 8
bottom = (bottom * baseunitY) / 8
In most
cases, the base units for the dialog box are the same as those retrieved by
using the GetDialogBaseUnits
function. If the dialog box template has the DS_SETFONT style, however, the
base units are the average width and height, in pixels, of the characters in
the font given by the template.
See Also