public static unsafe extern bool GetTextExtentPoint32Char(IntPtr hdc, char* ch, int c, out WIN32SIZE size);
public static extern bool GetTextExtentPoint32(IntPtr hdc, char[] charBuffer, int c, out WIN32SIZE size);
public static unsafe extern bool GetTextExtentPoint32Char(IntPtr hdc, char *ch, int c, out WIN32SIZE size);
public static extern bool GetTextExtentPoint32(IntPtr hdc, string lpstring, int c, out WIN32SIZE size);