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EM_CHARFROMPOS message

  • Artikkeli

Gets information about the character closest to a specified point in the client area of an edit control. You can send this message to either an edit control or a rich edit control.

Parameters

wParam

This parameter is not used.

lParam

The coordinates of a point in the control's client area. The coordinates are in screen units and are relative to the upper-left corner of the control's client area.

Rich edit controls: A pointer to a POINTL structure that contains the horizontal and vertical coordinates.

Edit controls: The LOWORD contains the horizontal coordinate. The HIWORD contains the vertical coordinate.

Return value

Rich edit controls: The return value specifies the zero-based character index of the character nearest the specified point. The return value indicates the last character in the edit control if the specified point is beyond the last character in the control.

Edit controls: The LOWORD specifies the zero-based index of the character nearest the specified point. This index is relative to the beginning of the control, not the beginning of the line. If the specified point is beyond the last character in the edit control, the return value indicates the last character in the control. The HIWORD specifies the zero-based index of the line that contains the character. For single-line edit controls, this value is zero. The index indicates the line delimiter if the specified point is beyond the last visible character in a line.

Remarks

Rich Edit: Supported in Microsoft Rich Edit 1.0 and later. For information about the compatibility of rich edit versions with the various system versions, see About Rich Edit Controls.

If a point is passed to EM_CHARFROMPOS as the lParam and the point is outside the bounds of the edit control, then the lResult is (65535, 65535).

Requirements

Requirement Value
Minimum supported client
 Windows Vista [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
Header
Winuser.h (include Windows.h)

See also

Reference

EM_POSFROMCHAR

Other Resources

MAKELPARAM

POINTL