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</ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="abftj0l" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="cz3mtcu" class="content" id="contentDiv" style="position:relative;"> <div id="nidroqg" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>：<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/內存使用"><em>內存使用</em></a></p>本文引用地址：<a href="http://dyxdggzs.com/article/201807/384660.htm">http://dyxdggzs.com/article/201807/384660.htm</a><p>有人寫(xiě)了一個(gè)將整數轉換為字符串的函數：</p><p>char *itoa (int n)</p><p>{</p><p>char retbuf[20];</p><p>sprintf(retbuf, %d, n);</p><p>return retbuf;</p><p>}</p><p>如果我調用這個(gè)函數：char *str5 = itoa(5)，str5會(huì )是什么結果呢?</p><p>答案分析：</p><p>答案是不確定，可以確定的是肯定不是我們想要的 “5”。</p><p>retbuf定義在函數體中，是一個(gè)局部變量，它的內存空間位于棧(stack)中的某個(gè)位置，其作用范圍也僅限于在itoa()這個(gè)函數中。當itoa()函數退出時(shí)，retbuf在調用棧中的內容將被收回，這時(shí)，這塊內存地址可能存放別的內容。因此將retbuf這個(gè)局部變量返回給調用者是達不到預期的目的的。</p><p>那么如何解決這個(gè)問(wèn)題呢，不用擔心，方法不但有，而且還不止一個(gè)，下面就來(lái)闡述三種能解決這個(gè)問(wèn)題的辦法：</p><p>1)、在itoa()函數內部定義一個(gè)static char retbuf[20]，根據靜態(tài)變量的特性，我們知道，這可以保證函數返回后retbuf的空間不會(huì )被收回，原因是函數內的靜態(tài)變量并不是放在棧中，而是放在程序中一個(gè)叫“.bss”段的地方，這個(gè)地方的內容是不會(huì )因為函數退出而被收回的。</p><p>這種辦法確實(shí)能解決問(wèn)題，但是這種辦法同時(shí)也導致了itoa()函數變成了一個(gè)不可重入的函數(即不能保證相同的輸入肯定有相同的輸出)，另外， retbuf [] 中的內容會(huì )被下一次的調用結果所替代，這種辦法不值得推薦。</p><p>2)、在itoa()函數內部用malloc() 為retbuf申請內存，并將結果存放其中，然后將retbuf返回給調用者。由于此時(shí)retbuf位于堆(heap)中，也不會(huì )隨著(zhù)函數返回而釋放，因此可以達到我們的目的。</p><p>但是有這樣一種情況需要注意：itoa()函數的調用者在不需要retbuf的時(shí)候必須把它釋放，否則就造成內存泄漏了，如果此函數和調用函數都是同一個(gè)人所寫(xiě)，問(wèn)題不大，但如果不是，則比較容易會(huì )疏漏此釋放內存的操作。</p><p>3)、將函數定義為char *itoa(int n， char *retbuf)，且retbuf的空間由調用者申請和釋放，itoa()只是將轉換結果存放到retbuf而已。</p><p>這種辦法明顯比第一、二種方法要好，既避免了方法1對函數的影響，也避免了方法2對內存分配釋放的影響，是目前一種比較通行的做法。</p><p>擴展分析：</p><p>其實(shí)就這個(gè)問(wèn)題本身而言，我想大家都可以立刻想到答案，關(guān)鍵在于對內存這種敏感資源的正確和合理地利用，下面對內存做一個(gè)簡(jiǎn)單的分析：</p><p>1)、程序中有不同的內存段，包括：</p><p>.data - 已初始化全局/靜態(tài)變量，在整個(gè)軟件執行過(guò)程中有效;</p><p>.bss - 未初始化全局/靜態(tài)變量，在整個(gè)軟件執行過(guò)程中有效;</p><p>.stack - 函數調用棧，其中的內容在函數執行期間有效，并由編譯器負責分配和收回;</p><p>.heap - 堆，由程序顯式分配和收回，如果不收回就是內存泄漏。</p><p>2)、自己使用的內存最好還是自己申請和釋放。</p><p>這可以說(shuō)是一個(gè)內存分配和釋放的原則，比如說(shuō)上面解決辦法的第二種，由itoa()分配的內存，最后由調用者釋放，就不是一個(gè)很好的辦法，還不如用第三種，由調用者自己申請和釋放。另外這個(gè)原則還有一層意思是說(shuō)：如果你要使用一個(gè)指針，最好先確信它已經(jīng)指向合法內存區了，如果沒(méi)有就得自己分配，要不就是非法指針訪(fǎng)問(wèn)。很多程序的致命錯誤都是訪(fǎng)問(wèn)一個(gè)沒(méi)有指向合法內存區的指針，這也包括空指針。</p><p>問(wèn)題：內存分配 sizeof</p><p>我使用sizeof來(lái)計算一個(gè)指針變量，我希望得到這個(gè)指針變量所分配的內存塊的大小，可以嗎?</p><p>Char *p = NULL;</p><p>int nMemSize = 0;</p><p>…</p><p>p = malloc(1024);</p><p>nMemSize = sizeof(p);</p><p>答案與分析：</p><p>答案是達不到你的要求，sizeof只能告訴你指針本身占用的內存大小。指針所指向的內存，如果是malloc分配的，sizeof 是沒(méi)有辦法知道的。換句話(huà)說(shuō)，malloc分配的內存是沒(méi)有辦法向內存管理模塊進(jìn)行事后查詢(xún)的，當然你可以自己編寫(xiě)代碼來(lái)維護。</p><p>問(wèn)題：棧<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/內存使用"><em>內存使用</em></a></p><p>下面程序運行有什么問(wèn)題?</p><p>char *GetString(void)</p><p>{</p><p>char p[] = hello world;</p><p>return p;// 編譯器將提出警告</p><p>}</p><p>void Test4(void)</p><p>{</p><p>char *str = NULL;</p><p>str = GetString();// str 的內容是垃圾</p><p>cout str endl;</p> </span>  <div class="2fjesq0" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="3g3ymhv" class="hAd8"> <br></span>   </div> </article> <div id="yiwkgwa" class="clear"></div> <br/> <div id="z0e0yay" class="hAd6"> <div class="lx5uz05" id="relA" style="width:auto;height:auto;"> <ul> <li>  <iframe id='af71d594' name='af71d594' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=114&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='650' height='30'><a target='_blank'><img 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