MFC中GDI之CFont（字体）

Posted 2021-03-24 htj10

字体主要是用于修饰文字输出的形状、高度、宽度、粗度、倾斜、删除线等。

BOOL CreateFontIndirect(const LOGFONT* lpLogFont);	根据LOGFONT结构体创建一个字体
BOOL CreateFont(      int nHeight,      int nWidth,      int nEscapenment,      intnOrientation,      int nWeight,      BYTE bItalic,      BYTE bUnderline,      BYTE cStrikeOut,      BYTE nCharset,      BYTE nOutPrecision,      BYTE nClipPrecision,      BYTE nQuality,      BYTE nPitchAndFamily,      LPCTSTR lpszFacename     );	根据指定数值创建字体，其参数与LOGFONT成员一致，故等价于 CreateFontIndirect
BOOL CreatePointFont(int nPointSize, LPCTSTR lpszFaceName, CDC* pDC = NULL);	根据字体的名字和高度创建字体
BOOL CreatePointFontIndirect(const LOGFONT* lpLogFont, CDC* pDC = NULL);	根据LOGFONT结构体创建点字体
static CFont* FromHandle(HFONT hFont)	将HFONT句柄转换为CFont对象
operator HFONT() const	从CFont对象中获取HFONT句柄
int GetLogFont(LOGFONT* pLogFont);	获取字体的名称和高、宽等属性信息

wingdi.h中定义：
#define ANSI_CHARSET  0    #define GB2312_CHARSET   134

/* Logical Font */
#define LF_FACESIZE         32

typedef struct tagLOGFONTA
{
    LONG      lfHeight;                //字体的高度
    LONG      lfWidth;                 //字体的宽度，取 0 ：自适应
    LONG      lfEscapement;            //设定字符串底线与水平线的夹角，以0.1° 为单位
    LONG      lfOrientation;           //设定每一个字符底线与水平线的夹角，以0.1° 为单位
    LONG      lfWeight;                //设置字体的粗细，范围 0-1000,400为正常粗细，700为粗，若取 0 ，则选择默认粗细
    BYTE      lfItalic;                //斜体
    BYTE      lfUnderline;             //下划线
    BYTE      lfStrikeOut;             //删除线
    BYTE      lfCharSet;               //指定字符集
    BYTE      lfOutPrecision;          //指定输出时字体的精度  OUT_DEFAULT_PRECIS
    BYTE      lfClipPrecision;         //指定输出时字体被裁减的精度 CLIP_DEFAULT_PRECIS
    BYTE      lfQuality;               //指定输出的质量 DEFAULT_QUALITY
    BYTE      lfPitchAndFamily;        //指定字体的斜度和字体的类型 DEFAULT_PITCH | FF_SWISS FF_ROMAN
    CHAR      lfFaceName[LF_FACESIZE]; //字体的名称
} LOGFONTA, *PLOGFONTA, NEAR *NPLOGFONTA, FAR *LPLOGFONTA;
typedef struct tagLOGFONTW
{
    LONG      lfHeight;
    LONG      lfWidth;
    LONG      lfEscapement;
    LONG      lfOrientation;
    LONG      lfWeight;
    BYTE      lfItalic;
    BYTE      lfUnderline;
    BYTE      lfStrikeOut;
    BYTE      lfCharSet;
    BYTE      lfOutPrecision;
    BYTE      lfClipPrecision;
    BYTE      lfQuality;
    BYTE      lfPitchAndFamily;
    WCHAR     lfFaceName[LF_FACESIZE];
} LOGFONTW, *PLOGFONTW, NEAR *NPLOGFONTW, FAR *LPLOGFONTW;

#ifdef UNICODE
typedef LOGFONTW LOGFONT;
typedef PLOGFONTW PLOGFONT;
typedef NPLOGFONTW NPLOGFONT;
typedef LPLOGFONTW LPLOGFONT;
#else
typedef LOGFONTA LOGFONT;
typedef PLOGFONTA PLOGFONT;
typedef NPLOGFONTA NPLOGFONT;
typedef LPLOGFONTA LPLOGFONT;
#endif // UNICODE

 

 微软提供的例子：

// The code fragment shows how to create a font object,
// select the font object into a DC (device context) for text
// drawing, and finally delete the font object.
 
// Initializes a CFont object with the specified characteristics. 
CFont font;
VERIFY(font.CreateFont(
   12,                        // nHeight
   0,                         // nWidth
   0,                         // nEscapement
   0,                         // nOrientation
   FW_NORMAL,                 // nWeight
   FALSE,                     // bItalic
   FALSE,                     // bUnderline
   0,                         // cStrikeOut
   ANSI_CHARSET,              // nCharSet
   OUT_DEFAULT_PRECIS,        // nOutPrecision
   CLIP_DEFAULT_PRECIS,       // nClipPrecision
   DEFAULT_QUALITY,           // nQuality
   DEFAULT_PITCH | FF_SWISS,  // nPitchAndFamily
   _T("Arial")));                 // lpszFacename
 
// Do something with the font just created...
CClientDC dc(this);  
CFont* def_font = dc.SelectObject(&font);
dc.TextOut(5, 5, _T("Hello"), 5);
dc.SelectObject(def_font);
 
// Done with the font.  Delete the font object.
font.DeleteObject(); 

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