EM_CHARFROMPOS
An
application sends an EM_CHARFROMPOS message to retrieve the zero-based
character index and zero-based line index of the character nearest the
specified point in an edit control.
EM_CHARFROMPOS
wParam = 0;
lParam = MAKELPARAM(x, y)
Parameters
x
Value of the
low-order word of lParam. Specifies the x-coordinate of a point in the
edit control's client area. The coordinate is relative to the upper-left corner
of the client area.
y
Value of the
high-order word of lParam. Specifies the y-coordinate of a point in the
edit control's client area. The coordinate is relative to the upper-left corner
of the client area.
Return Values
The return
value specifies the character index in the low-order word and the line index in
the high-order word. For single-line edit controls, the line index is always 0.
The return value is the last character in the edit control if the given point
is beyond the last character in the control. The return value is -1 if the specified point is outside the client area of
the edit control.
See Also