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EM_POSFROMCHAR message

  • Artikkeli

Retrieves the client area coordinates of a specified character in an edit control. You can send this message to either an edit control or a rich edit control.

Parameters

wParam

Rich Edit 1.0 and 3.0: A pointer to a POINTL structure that receives the client area coordinates of the character. The coordinates are in screen units and are relative to the upper-left corner of the control's client area.

Edit controls and Rich Edit 2.0: The zero-based index of the character.

lParam

Rich Edit 1.0 and 3.0: The zero-based index of the character.

Edit controls and Rich Edit 2.0: This parameter is not used.

Return value

Rich Edit 1.0 and 3.0: The return value is not used.

Edit controls and Rich Edit 2.0: The return value contains the client area coordinates of the character. The LOWORD contains the horizontal coordinate and the HIWORD contains the vertical coordinate.

Remarks

A returned coordinate can be a negative value if the specified character is not displayed in the edit control's client area. The coordinates are truncated to integer values.

If the character is a line delimiter, the returned coordinates indicate a point just beyond the last visible character in the line. If the specified index is greater than the index of the last character in the control, the control returns -1.

Rich Edit 3.0 and later: For backward compatibility, Microsoft Rich Edit 3.0 supports the syntax used by Microsoft Rich Edit 2.0. If Microsoft Rich Edit 3.0 detects that wParam is not a valid POINTL pointer, it assumes the message was sent using the Microsoft Rich Edit 2.0 syntax. In this case, it uses the return value to return the coordinates.

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.

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_CHARFROMPOS

Other Resources

POINTL