Get a single character size and string size

Original link: http://my.oschina.net/ypimgt/blog/62354

First, get the string size by: GetTextExtentPoint32.

Size *se=new size;
CDC MEMDC; First define a display device object
Memdc.selectobject (font);
...... Other operations related to MEMDC
GetTextExtentPoint32 (Memdc.getsafehdc (), Strtext,wcslen (StrText),<b>se</b>);//Gets the width of the string

SE->CX and Se->cy are the length and width of the string, respectively.

Second, to obtain the size of a single character by: GetTextMetrics.

Textmetric TM;

Memdc.gettextmetrics (&TM);

Textmetric diagram:

The members of the TEXTMETRIC structure are introduced:

Textmetric is the structure of the form defined in the WINGDI.H.

The TEXTMETRIC structure has 20 fields:

typedef struct TAGTEXTMETRIC {

LONG Tmheight; Character height see illustration of textmetric structure field

LONG tmascent; Character Upper height (above baseline)

LONG tmdescent; Character lower height (below baseline)

LONG tminternalleading,//number of top spaces with character heights defined by Tmheight

LONG tmexternalleading,//The number of spaces sandwiched between two rows

LONG tmavecharwidth,//Average character width

LONG tmmaxcharwidth,//width of the widest character

LONG Tmweight; The weight and severity of the font

LONG TmOverhang,//Add additional height on some stitching fonts

LONG Tmdigitizedaspectx,//device horizontal orientation for font design

LONG tmdigitizedaspecty,//device vertical orientation for font design

Bchar Tmfirstchar; The first character defined for a font

Bchar Tmlastchar; The last character defined for the font

Bchar Tmdefaultchar; Substitution characters for characters that are not in the font

Bchar Tmbreakchar; The characters used for Chaizi

BYTE Tmitalic,//non-zero when font is italic

BYTE tmunderlined,//non-zero when the font is underlined

BYTE tmstruckout,//font is deleted when nonzero

BYTE tmpitchandfamily,//font spacing (low 4 bits) and family (high 4 bit)

BYTE Tmcharset; Character set of the font

} textmetric;

Variable:

BYTE tmpitchandfamily:

Tmpf_fixed_pitch for true expression variable-length font, FALSE is fixed-length font
Tmpf_vector for true expression vector font
Tmpf_truetype is true for all true fonts
Tmpf_device to TRUE indicates device font
Variables of type textmetric are used to store device font structure information (the above variables), which is required when outputting text in a window.

Example One

To get the value of the Textmetric type variable, you can use the GetTextMetrics (hdc,lptextmetric) function in the Windows SDK; GetTextMetrics (&TM) is available in MFC.

Examples of use are as follows:

Using the Windows SDK:

Textmetric TM;

GetTextMetrics (HDC,&TM);

Using MFC's Usage:

Textmetric TM;

Cdc::gettextmetrics (&TM);

Example Two

The following is the WM_CREATE program code that obtains the character width and height of the system font:

Case WM_CREATE:

HDC = GetDC (hwnd);

GetTextMetrics (hdc, &TM);

Cxchar = Tm.tmavecharwidth;

Cychar = Tm.tmheight + tm.tmexternalleading;

ReleaseDC (hwnd, HDC);

return 0;

Where Cxchar, Cychar, and cxcaps are variables of type static int defined in the callback function. For fixed-width fonts, cxcaps equals Cxchar. For variable-width fonts, cxcaps is set to Cxchar multiplied by 150%. For variable-width fonts, the tmpitchandfamily field in the TEXTMETRIC structure has a low level of 1, and for fixed-width fonts, the value is 0. Example two uses this bit from Cxchar to calculate cxcaps:cxcaps = (tm.tmpitchandfamily & 1? 3:2) * CXCHAR/2;

Get a single character size and string size