The GetTextExtentPoint function computes the width and height of the specified string of text.
GetTextExtentPoint is provided for compatibility with 16-bit versions of Windows. Win32-based applications should call the GetTextExtentPoint32 function, which provides more accurate results.
BOOL GetTextExtentPoint(
HDC hdc, // handle to device context
LPCTSTR lpString, // pointer to text string
int cbString, // number of characters in string
LPSIZE lpSize // pointer to structure for string size
);
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.
The GetTextExtentPoint function uses the currently selected font to compute the dimensions of the string. The width and height, in logical units, are computed without considering any clipping.
Because some devices kern characters, the sum of the extents of the characters in a string may not be equal to the extent of the string.
The calculated string width takes into account the intercharacter spacing set by the SetTextCharacterExtra function.
Windows CE: The GetTextExtentPoint function is identical to the GetTextExtentPoint32 function.
Fonts and Text Overview, Font and Text Functions, GetTextExtentPoint32, SetTextCharacterExtra, SIZE