The GetTextMetrics function fills the specified buffer with the metrics for the currently selected font.
BOOL GetTextMetrics(
  HDC hdc,            // handle to device context
  LPTEXTMETRIC lptm   // pointer to text metrics structure
);
 If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero.
Windows NT: To get extended error information, call GetLastError.
Windows CE: For any given font, the text metric values in Windows CE will not necessarily match the text metric values in Windows desktop platforms.
  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in wingdi.h.
  Import Library: Use gdi32.lib.
  Unicode: Implemented as Unicode and ANSI versions on Windows NT.
Fonts and Text Overview, Font and Text Functions, GetTextAlign, GetTextExtentPoint32, GetTextFace, SetTextJustification, TEXTMETRIC