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<html><head><meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312"><meta NAME="GENERATOR" CONTENT="Microsoft FrontPage 3.0"><meta NAME="doccomm" CONTENT="sss"><meta NAME="Template" CONTENT="C:\MSOffice\Template\Sl_BOOK.dot"><meta NAME="Author" CONTENT="Cheng Jinxing"><title>Visual C++編程技巧之五</title></head><body TEXT="#000000" BGCOLOR="#CCFFFF" LINK="#0000EE" VLINK="#551A8B" ALINK="#FF0000"><p align="center"><br><font SIZE="+3" FACE="楷體_GB2312">Visual C++編程技巧之五</font> </p><p><a HREF="#tip33"><font SIZE="+0" FACE="Times New Roman">33</font><font SIZE="+0">、如何獲取一個對話控件的指針</font></a> </p><p><a HREF="#tip34"><font SIZE="+0" FACE="Times New Roman">34</font><font SIZE="+0">、如何禁止和使能控件</font></a> </p><p><a HREF="#tip35"><font SIZE="+0" FACE="Times New Roman">35</font><font SIZE="+0">、如何改變控件的字體</font></a> </p><p><a HREF="#tip36"><font SIZE="+0" FACE="Times New Roman">36</font><font SIZE="+0">、如何在</font><fontSIZE="+0" FACE="Times New Roman">OLE</font><font SIZE="+0">控件中使用</font><fontSIZE="+0" FACE="Times New Roman">OLE_COLOR</font><font SIZE="+0">數據類型</font></a> </p><p><a HREF="#tip37"><font SIZE="+0" FACE="Times New Roman">37</font><font SIZE="+0">、在不使用通用文件打開對話的情況下如何顯示一個文件列表</font></a> </p><p><a HREF="#tip38"><font SIZE="+0" FACE="Times New Roman">38</font><font SIZE="+0">、為什么旋轉按鈕控件看起來倒轉</font></a> </p><p><a HREF="#tip39"><font SIZE="+0" FACE="Times New Roman">39 </font><font SIZE="+0">為什么旋轉按鈕控件不能自動地更新它下面的編輯控件</font></a> </p><p><a HREF="#tip40"><font SIZE="+0" FACE="Times New Roman">40</font><font SIZE="+0">、如何用位圖顯示下壓按鈕</font></a> </p><p><font SIZE="+2"><b> </b></font> </p><p><a NAME="tip33"></a><b><font SIZE="+2"><font FACE="Times New Roman">33</font><fontFACE="黑體">、如何獲取一個對話控件的指針</font></font></b> </p><p><font SIZE="+0">有兩種方法。其一，調用<font FACE="Times New Roman">CWnd: : GetDlgItem</font>，獲取一個<font FACE="Times New Roman">CWnd*</font>指針調用成員函數。下例調用<fontFACE="Times New Roman">GetDlgItem</font>，將返回值傳給一個<fontFACE="Times New Roman">CSpinButtonCtrl*</font>以便調用<font FACE="Times New Roman">CSpinButtonCtrl : : SetPos </font>函數：</font> </p><p><font SIZE="+0" FACE="Times New Roman">BOOL CSampleDialog : : OnInitDialog ( )</font> </p><p><font SIZE="+0" FACE="Times New Roman">{</font> </p><p><font SIZE="+0" FACE="Times New Roman">CDialog : : OnInitDialog ( ) ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">//Get pointer to spin button .</font> </p><p><font SIZE="+0" FACE="Times New Roman">CSpinButtonCtrl * pSpin - ( CSpinButtonCtrl *) GetDlgItem (IDC_SPIN) ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">ASSERT _ VALID (pSpin) ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">//Set spin button's default position .</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">pSpin </font>—<fontFACE="Times New Roman">> SetPos (10) ;</font></font> </p><p><font SIZE="+0" FACE="Times New Roman">return TRUE ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">}</font> </p><p><font SIZE="+0">其二， 可以使用<font FACE="Times New Roman">ClassWizard</font>將控件和成員變量聯系起來。在<fontFACE="Times New Roman">ClassWizard</font>中簡單地選擇<font FACE="Times New Roman">Member Variables</font>標簽，然后選擇<font FACE="Times New Roman">Add Variable </font>…按鈕。如果在對話資源編輯器中，按下<fontFACE="Times New Roman">Ctrl</font>鍵并雙擊控件即可轉到<fontFACE="Times New Roman">Add Member Variable</font>對話。</font> </p><p><a NAME="tip34"></a><b><font SIZE="+2"><font FACE="Times New Roman">34</font><fontFACE="黑體">、如何禁止和使能控件</font></font></b> </p><p><font SIZE="+0">控件也是窗口，所以可以調用<font FACE="Times New Roman">CWnd : : EnableWindow</font>使能和禁止控件。</font> </p><p><font SIZE="+0" FACE="Times New Roman">//Disable button controls .</font> </p><p><font SIZE="+0" FACE="Times New Roman">m_wndOK.EnableWindow (FALSE ) ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">m_wndApply.EnableWindow (FALSE ) ;</font> </p><p><a NAME="tip35"></a><b><font SIZE="+2"><font FACE="Times New Roman">35</font><fontFACE="黑體">、如何改變控件的字體</font></font></b> </p><p><font SIZE="+0">由于控件是也是窗口，用戶可以調用<fontFACE="Times New Roman">CWnd: : SetFont</font>指定新字體。該函數用一個<fontFACE="Times New Roman">Cfont</font>指針，要保證在控件撤消之前不能撤消字體對象。下例將下壓按鈕的字體改為<fontFACE="Times New Roman">8</font>點<font FACE="Times New Roman">Arial</font>字體：</font> </p><p><font SIZE="+0" FACE="Times New Roman">//Declare font object in class declaration (.H file ).</font> </p><p><font SIZE="+0" FACE="Times New Roman">private :</font> </p><p><font SIZE="+0" FACE="Times New Roman">Cfont m_font ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">// Set font in class implementation (.Cpp file ). Note m_wndButton is a</font> </p><p><font SIZE="+0" FACE="Times New Roman">//member variable added by ClassWizard.DDX routines hook the member</font> </p><p><font SIZE="+0" FACE="Times New Roman">//variable to a dialog button contrlo.</font> </p><p><font SIZE="+0" FACE="Times New Roman">BOOL CSampleDialog : : OnInitDialog ( )</font> </p><p><font SIZE="+0" FACE="Times New Roman">{</font> </p><p><font SIZE="+0">…</font> </p><p><font SIZE="+0" FACE="Times New Roman">//Create an 8-point Arial font</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">m_font . CreateFont (MulDiv (8 , -pDC</font>—<fontFACE="Times New Roman">> GetDeviceCaps (LOGPIXELSY) , 72).</font></font> </p><p><font SIZE="+0" FACE="Times New Roman">0 , 0 , 0 , FW_NORMAL , 0 , 0, 0, ANSI_CHARSER, OUT_STROKE_PRECIS ,</font> </p><p><font SIZE="+0" FACE="Times New Roman">CLIP_STROKE _PRECIS , DRAFT _QUALITY</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">VARIABLE_PITCH </font>｜<fontFACE="Times New Roman">FF_SWISS, _T ("Arial") );</font></font> </p><p><font SIZE="+0" FACE="Times New Roman">//Set font for push button .</font> </p><p><font SIZE="+0" FACE="Times New Roman">m_wndButton . SetFont (&m _font );</font> </p><p><font SIZE="+0">…</font> </p><p><font SIZE="+0" FACE="Times New Roman">}</font> </p><p><a NAME="tip36"></a><b><font SIZE="+2"><font FACE="Times New Roman">36</font><fontFACE="黑體">、如何在</font><font FACE="Times New Roman">OLE</font><fontFACE="黑體">控件中使用</font><font FACE="Times New Roman">OLE_COLOR</font><fontFACE="黑體">數據類型</font></font></b> </p><p><font SIZE="+0">諸如<font FACE="Times New Roman">COleControl : : GetFortColor</font>和<fontFACE="Times New Roman">COleControl : : GetBackColor</font>等函數返回<fontFACE="Times New Roman">OLE _COLOR</font>數據類型的顏色，而<fontFACE="Times New Roman">GDI</font>對象諸如筆和刷子使用的是<fontFACE="Times New Roman">COLORREF</font>數據類型，調用<font FACE="Times New Roman">COleControl : : TranslateColor</font>可以很容易地將<font FACE="Times New Roman">OLE_COLOR</font>類型改為<fontFACE="Times New Roman">COLORREF</font>類型。下例創建了一個當前背景顏色的刷子：</font> </p><p><font SIZE="+0" FACE="Times New Roman">void CSampleControl : : OnDraw (CDC* pdc</font> </p><p><font SIZE="+0" FACE="Times New Roman">const Crect& rcBounds , const Crect& rcInvalid )</font> </p><p><font SIZE="+0" FACE="Times New Roman">{</font> </p><p><font SIZE="+0" FACE="Times New Roman">//Create a brush of the cuttent background color .</font> </p><p><font SIZE="+0" FACE="Times New Roman">CBrush brushBack (TranslateColor (GetBackColor ( ) ) );</font> </p><p><font SIZE="+0" FACE="Times New Roman">//Paint the background using the current background color .</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">pdc</font>—<font FACE="Times New Roman">> FilllRect (rcBounds , &brushBack) ;</font></font> </p><p><font SIZE="+0" FACE="Times New Roman">//other drawign commands</font> </p><p><font SIZE="+0">…</font> </p><p><font SIZE="+0" FACE="Times New Roman">}</font> </p><p><a NAME="tip37"></a><b><font SIZE="+2"><font FACE="Times New Roman">37</font><fontFACE="黑體">、在不使用通用文件打開對話的情況下如何顯示一個文件列表</font></font></b> </p><p><font SIZE="+0">調用<font FACE="Times New Roman">CWnd: : DlgDirList</font>或者<fontFACE="Times New Roman">CWnd: : DlgDirListComboBox</font>， <font FACE="Times New Roman">Windows </font>將自動地向列表框或組合框填充可用的驅動器名或者指定目錄中的文件，下例將<fontFACE="Times New Roman">Windows</font>目錄中的文件填充在組合框中：</font> </p><p><font SIZE="+0" FACE="Times New Roman">BOOL CSampleDig : : OnInitDialog ( )</font> </p><p><font SIZE="+0" FACE="Times New Roman">{</font> </p><p><font SIZE="+0" FACE="Times New Roman">CDialog : : OnInitDialog ( )</font> </p><p><font SIZE="+0" FACE="Times New Roman">TCHAR szPath [MAX_PATH] = {"c:\\windows"} ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">int nReslt = DlgDirListComboBox (szPath , IDC_COMBO , IDC_CURIDIR,</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">DDL_READWRITE </font>｜<fontFACE="Times New Roman">DDL_READONLY</font>｜<font FACE="Times New Roman">DDL_HIDDEN</font>｜</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">DDL_SYSTEM</font>｜<fontFACE="Times New Roman">DDL_ARCHIVE ) ;</font></font> </p><p><font SIZE="+0" FACE="Times New Roman">return TRUE ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">}</font> </p><p><a NAME="tip38"></a><b><font SIZE="+2"><font FACE="Times New Roman">38</font><fontFACE="黑體">、為什么旋轉按鈕控件看起來倒轉</font></font></b> </p><p><font SIZE="+0">需要調用<font FACE="Times New Roman">CSpinCtrl : : SetRange </font>設置旋轉按鈕控件的范圍，旋轉按鈕控件的缺省上限為<fontFACE="Times New Roman">0</font>，缺省下限為<font FACE="Times New Roman">100</font>，這意味著增加時旋轉按控件的值由<fontFACE="Times New Roman">100</font>變為<font FACE="Times New Roman">0</font>。下例將旋轉按鈕控件的范圍設置為<fontFACE="Times New Roman">0</font>到<font FACE="Times New Roman">100</font>：</font> </p><p><font SIZE="+0" FACE="Times New Roman">BOOL CAboutDlg : : OnInitDialog ( )</font> </p><p><font SIZE="+0" FACE="Times New Roman">{</font> </p><p><font SIZE="+0" FACE="Times New Roman">CDialog : : OnInitDialog ( )</font> </p><p><font SIZE="+0" FACE="Times New Roman">//set the lower and upper limit of the spin button</font> </p><p><font SIZE="+0" FACE="Times New Roman">m_wndSpin . SetRange ( 0 ,100 ) ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">return TRUE ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">}</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">Visual C++ 4.0 Print</font>對話中的<fontFACE="Times New Roman">Copise</font>旋轉按鈕控件也有同樣的問題：按下<fontFACE="Times New Roman">Up</font>按鈕時拷貝的數目減少，而按下<fontFACE="Times New Roman">Down </font>按鈕時拷貝的數目增加。</font> </p><p><a NAME="tip39"></a><b><font SIZE="+2"><font FACE="Times New Roman">39</font><fontFACE="黑體">為什么旋轉按鈕控件不能自動地更新它下面的編輯控件</font></font></b> </p><p><font SIZE="+0">如果使用旋轉按鈕的<font FACE="Times New Roman">autu buddy</font>特性， 則必須保證在對話的標記順序中<font FACE="Times New Roman">buddy</font>窗口優先于旋轉按鈕控件。從<fontFACE="Times New Roman">Layout</font>菜單中選擇<font FACE="Times New Roman">Tab Order</font>菜單項（或者按下<fontFACE="Times New Roman">Crtl+D</font>）可以設置對話的標簽順序。</font> </p><p><a NAME="tip40"></a><b><font SIZE="+2"><font FACE="Times New Roman">40</font><fontFACE="黑體">、如何用位圖顯示下壓按鈕</font></font></b> </p><p><font SIZE="+0"><font FACE="Times New Roman">Windows 95</font>按鈕有幾處新的創建風格，尤其是<fontFACE="Times New Roman">BS_BITMAP</font>和<font FACE="Times New Roman">BS_ICON</font>，要想具有位圖按鈕，創建按鈕和調用<fontFACE="Times New Roman">CButton : : SetBitmap</font>或<font FACE="Times New Roman">CButton : : SetIcon</font>時要指定<font FACE="Times New Roman">BS_BITMAP</font>或<fontFACE="Times New Roman">BS_ICON</font>風格。</font> </p><p><font SIZE="+0">首先，設置按鈕的圖標屬性。</font> </p><p><font SIZE="+0">然后，當對話初始化時調用<font FACE="Times New Roman">CButton: : SetIcon</font>。注意：下例用圖標代替位圖，使用位圖時要小心，因為不知道背景所有的顏色——并非每個人都使用淺灰色。</font> </p><p><font SIZE="+0" FACE="Times New Roman">BOOL CSampleDlg : : OnInitDialog ( )</font> </p><p><font SIZE="+0" FACE="Times New Roman">{</font> </p><p><font SIZE="+0" FACE="Times New Roman">CDialog : : OnInitDialog ( ) ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">//set the images for the push buttons .</font> </p><p><font SIZE="+0"><font FACE="Times New Roman">m_wndButton1.SetIcon (AfxGetApp ( ) </font>—<fontFACE="Times New Roman">> LoadIcon (IDI _ IPTION1) )</font></font> </p><p><font SIZE="+0"><font FACE="Times New Roman">m_wndButton2.SetIcon (AfxGetApp ( ) </font>—<fontFACE="Times New Roman">> LoadIcon (IDI _ IPTION2) )</font></font> </p><p><font SIZE="+0"><font FACE="Times New Roman">m_wndButton3.SetIcon (AfxGetApp ( ) </font>—<fontFACE="Times New Roman">> LoadIcon (IDI _ IPTION3) )</font></font> </p><p><font SIZE="+0" FACE="Times New Roman">return TRUE ;</font> </p><p><font SIZE="+0" FACE="Times New Roman">}</font> </p><hr><p> <a HREF="skill.htm">返回上頁</a> </p></body></html>?? 快捷鍵說明
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