example13-1.htm

Visual C++面向对象程序设计教程（配套习题资源）

        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">if 
        (pBuffer != NULL)</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">free 
        (pBuffer) ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">if 
        ((pBuffer = (char *) malloc (cxBuffer * cyBuffer)) == NULL)</font></p>
        <blockquote>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">MessageBox 
          (hwnd, &quot;<font FACE="??ì?,SimSun" LANG="ZH-CN">窗口太大，没有足够的内存</font>&quot;, 
          &quot;Typer&quot;,</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">MB_ICONEXCLAMATION 
          | MB_OK) ;</font></p>
        </blockquote>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">else</font></p>
        <blockquote>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">for 
          (y = 0 ; y &lt; cyBuffer ; y++)</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">for 
          (x = 0 ; x &lt; cxBuffer ; x++)</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">BUFFER(x,y) 
          = ' ' ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">xCaret 
          = 0 ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">yCaret 
          = 0 ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">if 
          (hwnd == GetFocus ( ))</font></p>
          <blockquote>
            <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">SetCaretPos 
            (xCaret * cxChar, yCaret * cyChar) ;</font></p>
          </blockquote>
        </blockquote>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">return 
        0 ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0">　</p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case 
        WM_SETFOCUS :</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">CreateCaret 
        (hwnd, NULL, cxChar, cyChar) ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">SetCaretPos 
        (xCaret * cxChar, yCaret * cyChar) ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">ShowCaret 
        (hwnd) ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">return 
        0 ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0">　</p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case 
        WM_KILLFOCUS :</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">HideCaret 
        (hwnd) ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">DestroyCaret 
        ( ) ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">return 
        0 ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0">　</p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case 
        WM_KEYDOWN :</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">switch 
        (wParam)</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">{</font></p>
        <blockquote>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case 
          VK_HOME :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">xCaret 
          = 0 ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_END :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">xCaret 
          = cxBuffer - 1 ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_PRIOR :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">yCaret 
          = 0 ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_NEXT :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">yCaret 
          = cyBuffer - 1 ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_LEFT :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">xCaret 
          = max (xCaret - 1, 0) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_RIGHT :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">xCaret 
          = min (xCaret + 1, cxBuffer - 1) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_UP :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">yCaret 
          = max (yCaret - 1, 0) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_DOWN :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">yCaret 
          = min (yCaret + 1, cyBuffer - 1) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 5; margin-bottom: 0"><font size="2">case 
          VK_DELETE :</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">for 
          (x = xCaret ; x &lt; cxBuffer - 1 ; x++)</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">BUFFER 
          (x, yCaret) = BUFFER (x + 1, yCaret) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">BUFFER 
          (cxBuffer - 1, yCaret) = ' ' ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">HideCaret 
          (hwnd) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">hdc 
          = GetDC (hwnd) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">SelectObject 
          (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">TextOut 
          (hdc, xCaret * cxChar, yCaret * cyChar,</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">&amp; 
          BUFFER (xCaret, yCaret), cxBuffer - xCaret) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">ShowCaret 
          (hwnd) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">ReleaseDC 
          (hwnd, hdc) ;</font></p>
          <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">break 
          ;</font></p>
        </blockquote>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">}</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">SetCaretPos 
        (xCaret * cxChar, yCaret * cyChar) ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">return 
        0 ;</font></p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0">　</p>
        <p ALIGN="justify" style="line-height: 100%; margin-top: 0; margin-bottom: 0"><font size="2">case 
        WM_CHAR :</font></p>