VS2010/MFC编程入门之四十八（字体和文本输出：文本输出）-白红宇

VS2010/MFC编程入门之四十八（字体和文本输出：文本输出）

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发布时间：2019-02-25

本文共 3732 字，大约阅读时间需要 12 分钟。

MFC????????????

?MFC???????????????????????????????????????????????????????????????

??????

????????????????????????????????????Windows??????????????????????????????????????????????????

?????????????????

??????

?????

????????

1. ??????

?????????????????????????????????????????????????????????????????????????????CFont????????????????????GetTextMetrics?????????

BOOL GetTextMetrics(__in HDC hdc, __out LPTEXTMETRIC lptm);

TEXTMETRIC??????????

tmHeight?????

tmAscent??????????

tmDescent??????????

tmInternalLeading??tmHeight??????????????

tmExternalLeading????

tmAveCharWidth????????

tmMaxCharWidth????????

tmWeight??????

tmOverhang???????????

tmDigitizedAspectX?????????x???

tmDigitizedAspectY?????????y???

tmFirstChar??????????

tmLastChar???????????

tmDefaultChar???????????

tmBreakChar?????????

tmItalic??0????????

tmUnderlined??0?????????

tmStruckOut??0??????????

tmPitchAndFamily?????????

tmCharSet????

2. ?????

????????????????????????????????

?????????

??????????????GetTextExtentPoint32?????????

BOOL GetTextExtentPoint32(__in HDC hdc, __in LPCTSTR lpString, __in int c, __out LP.SIZE lpSize);

????????????????????????

?????????????

??GetTextMetrics??????????????????????????????????

3. ????????

?????TextOut???????????TextOut????????

BOOL TextOut(__in HDC hdc, __in int nXStart, __in int nYStart, __in LPCTSTR lpString, __in int cbString);

???CDC??TextOut?????????????

virtual BOOL TextOut(int x, int y, LPCTSTR lpszString, int nCount);
BOOL TextOut(int x, int y, const CString& str);

????????????

????????MFC??????????????????????????

????

????????MFC??????Example48?

???????????IDD_EXAMPLE48_DIALOG?????????????

?Example48Dlg.h????CExample48????????

int m_nTextX; // ???????????x??
int m_nTextY; // ???????????y??
CFont m_newFont;
CFont* m_pOldFont;

?CExample48Dlg???????????????

CExample48Dlg::CExample48Dlg(CWnd* pParent /*=NULL*/)
{
    CDialogEx(CExample48Dlg::IDD, pParent);
    m_nTextX = 260;
    m_nTextY = 10;
    m_pOldFont = NULL;
}

?OnInitDialog????????????

BOOL CExample48Dlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();
    // ?????18????
    m_newFont.CreatePointFont(180, _T("??"));
    m_pOldFont = (CFont*)dc.SelectObject(&m_newFont);
    // ?????
    SetTimer(1, 200, NULL);
    return TRUE;
}

??OnPaint????????????

void CExample48Dlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this);
        dc.SendMessage(WM_ICONERASEBKGND, reinterpret_cast
      
       (dc.GetSafeHdc()), 0);
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CPaintDC dc(this);
        // ??????????
        m_pOldFont = (CFont*)dc.SelectObject(&m_newFont);
        dc.SetBkMode(TRANSPARENT);
        dc.SetTextColor(RGB(255, 0, 0));
        dc.TextOut(m_nTextX, 10, _T("????????"));
        dc.SetTextColor(RGB(0, 255, 0));
        dc.TextOut(10, m_nTextY, _T("????www.jizhuomi.com"));
        dc.SelectObject(m_pOldFont);
        CDialogEx::OnPaint();
    }
}

?Class View???CExample48Dlg?????Properties?????????Messages?????WM_TIMER???????????CExample48Dlg::OnTimer(UINT_PTR nIDEvent)?????????????

void CExample48Dlg::OnTimer(UINT_PTR nIDEvent)
{
    LOGFONT logFont;
    m_newFont.GetLogFont(&logFont);
    // ????
    m_nTextX -= 5;
    if (m_nTextX < 10)
    {
        m_nTextX = 260;
    }
    // ????
    m_nTextY += abs(logFont.lfHeight);
    if (m_nTextY > 260)
    {
        m_nTextY = 10;
    }
    Invalidate();
    CDialogEx::OnTimer(nIDEvent);
}