锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20037;&#20037;&#20037;&#57;&#57;&#31934;&#21697;&#25104;&#20154;&#29255;&#20013;&#25991;&#23383;&#24149;&#13;&#44;&#20037;&#20037;&#20813;&#36153;&#22269;&#20135;&#31934;&#21697;&#19968;&#21306;&#20108;&#21306;&#44;&#57;&#55;&#31934;&#21697;&#20234;&#20154;&#20037;&#20037;&#20037;&#22823;&#39321;&#32447;&#34121;</title><link>http://www.shnenglu.com/zhuyuyuseu/category/1748.html</link><description /><language>zh-cn</language><lastBuildDate>Mon, 02 Jun 2008 21:24:40 GMT</lastBuildDate><pubDate>Mon, 02 Jun 2008 21:24:40 GMT</pubDate><ttl>60</ttl><item><title>鍑芥暟鐨勭壒鎬?/title><link>http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7140.html</link><dc:creator>Gerrard</dc:creator><author>Gerrard</author><pubDate>Sun, 14 May 2006 13:18:00 GMT</pubDate><guid>http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7140.html</guid><wfw:comment>http://www.shnenglu.com/zhuyuyuseu/comments/7140.html</wfw:comment><comments>http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7140.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/zhuyuyuseu/comments/commentRss/7140.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/zhuyuyuseu/services/trackbacks/7140.html</trackback:ping><description><![CDATA[鍑芥暟鐨勯噸杞斤細璇箟鍜屽姛鑳界浉浼肩殑鍑芥暟鐢ㄧ浉鍚岀殑鍚嶅瓧琛ㄧず錛岀紪璇戝櫒鏍規(guī)嵁涓嶅悓鐨勫弬鏁頒負涓嶅悓鐨勫嚱鏁頒駭鐢熶笉鍚岀殑鍐呴儴鏍囪瘑絎?
C++鍑芥暟璋冪敤C鍑芥暟錛歟xtern "C"{ }
!!騫朵笉鏄嚱鏁板悕鐩稿悓灝辨槸閲嶈澆錛屽叏灞�鍑芥暟鍜岀被鎴愬憳鍑芥暟灝變笉鏄噸杞斤紝浣滅敤鍩熶笉鍚?
闃叉闅愬紡綾誨瀷杞崲鑰屽鑷撮噸杞藉嚱鏁拌皟鐢ㄧ殑浜屼箟鎬?

鎴愬憳鍑芥暟鐨勯噸杞姐�佽鐩栧拰闅愯棌
閲嶈澆鐨勭壒寰乷verload錛?
錛?錛夊叿鏈夌浉鍚岀殑鑼冨洿錛堝湪鍚屼竴涓被涓級
錛?錛夊嚱鏁板悕瀛楃浉鍚?
錛?錛夊弬鏁頒笉鍚?
錛?錛塿irtual鍏抽敭瀛楀彲鏈夊彲鏃?
瑕嗙洊鐨勭壒鎬verriding:
媧劇敓綾昏鐩栧熀綾葷殑鍑芥暟錛?
 錛?錛夎寖鍥翠笉鍚岋紙涓嶅湪鍚屼竴涓被涓級
 錛?錛夊嚱鏁板悕瀛楃浉鍚?
 錛?錛夊弬鏁扮浉鍚?
 錛?錛夊熀綾誨繀欏誨甫virtual鍏抽敭瀛?
闅愯棌瑙勫垯錛?
錛?錛夊鏋滄淳鐢熺被鐨勫嚱鏁頒笌鍩虹被鐨勫嚱鏁板悓鍚嶏紝浣嗘槸鍙傛暟涓嶅悓銆傛鏃訛紝涓嶈鏈夋棤virtual
鍏抽敭瀛楋紝鍩虹被鐨勫嚱鏁板皢琚殣钘忥紙娉ㄦ剰鍒笌閲嶈澆娣鋒穯錛夈�?
錛?錛夊鏋滄淳鐢熺被鐨勫嚱鏁頒笌鍩虹被鐨勫嚱鏁板悓鍚嶏紝騫朵笖鍙傛暟涔熺浉鍚岋紝浣嗘槸鍩虹被鍑芥暟娌℃湁virtual
鍏抽敭瀛椼�傛鏃訛紝鍩虹被鐨勫嚱鏁拌闅愯棌錛堟敞鎰忓埆涓庤鐩栨販娣嗭級銆?


鍙傛暟鐨勭己鐪?
鍙兘鍑虹幇鍦ㄥ嚱鏁板０鏄庝腑

鍏抽敭瀛梚nline 蹇呴』涓庡嚱鏁板畾涔変綋鏀懼湪涓�璧鋒墠鑳戒嬌鍑芥暟鎴愪負鍐呰仈
瀹氫箟鍦ㄧ被澹版槑涔嬩腑鐨勬垚鍛樺嚱鏁板皢鑷姩鍦版垚涓哄唴鑱斿嚱鏁?
錛?錛夊鏋滃嚱鏁頒綋鍐呯殑浠ｇ爜姣旇緝闀匡紝浣跨敤鍐呰仈灝嗗鑷村唴瀛樻秷鑰椾唬浠瘋緝楂樸�?
錛?錛夊鏋滃嚱鏁頒綋鍐呭嚭鐜板驚鐜紝閭ｄ箞鎵ц鍑芥暟浣撳唴浠ｇ爜鐨勬椂闂磋姣斿嚱鏁拌皟鐢ㄧ殑寮�閿�澶?img src ="http://www.shnenglu.com/zhuyuyuseu/aggbug/7140.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/zhuyuyuseu/" target="_blank">Gerrard</a> 2006-05-14 21:18 <a href="http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7140.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>涓嶆槸鐢ㄦ寚閽堢殑紼嬪簭鍛樹笉鏄悎鏍肩殑紼嬪簭鍛?</title><link>http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7131.html</link><dc:creator>Gerrard</dc:creator><author>Gerrard</author><pubDate>Sun, 14 May 2006 07:01:00 GMT</pubDate><guid>http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7131.html</guid><wfw:comment>http://www.shnenglu.com/zhuyuyuseu/comments/7131.html</wfw:comment><comments>http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7131.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/zhuyuyuseu/comments/commentRss/7131.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/zhuyuyuseu/services/trackbacks/7131.html</trackback:ping><description><![CDATA[1)鍐呭瓨鐨勫嚑縐嶅垎閰嶆柟寮?
   闈欐�佸瓨鍌ㄥ尯:鍏ㄥ眬鍙橀噺鍜岄潤鎬佸彉閲?
  鏍堢┖闂?灞�閮ㄥ彉閲?鍙傛暟
  鍫嗗垎閰?鍔ㄦ�?
2)甯歌鐨勫唴瀛樺鐞嗛敊璇互鍙婄瓥鐣?
  1 鍒嗛厤鏈垚鍔熷氨寮�濮嬩嬌鐢?
   瀵圭瓥:媯�嫻嬫寚閽堟槸鍚︿負NULL(鍒ゆ柇)
     ex:assert(p!=NULL)//鑻ワ及涓哄嚱鏁扮殑鍙傛暟
銆�銆�銆� if(p!=NULL)/if(p==NULL) //鍒ゆ柇鍒嗛厤鍐呭瓨鏄惁鏈夋晥
銆�2 鍐呭瓨鍒嗛厤鎴愬姛浣嗘病鍒濆鍖栵紙璧嬪垵鍊鹼級
銆�3 鍐呭瓨鍒嗛厤鎴愬姛浣嗘搷浣滆秺鐣?
銆�4 蹇樿閲婃斁鍐呭瓨鑰岄�犳垚鍐呭瓨娉勯湶
銆�5 閲婃斁浜嗗唴瀛樺嵈緇х畫浣跨敤瀹?
銆�銆�鍘熷洜錛氳繃澶氱殑瀵硅薄璋冪敤
銆�銆�銆�銆�銆�return璇彞涓繑鍥炰簡鎸囧悜鏍堢┖闂寸殑鎸囬拡鎴栧叾寮曠敤錛岃鍐呭瓨鍦ㄥ嚱鏁頒綋緇撴潫鍚庤嚜鍔ㄩ攢姣?
銆�銆�銆�銆�銆�浣跨敤free/delete鍚庢病鏈夊皢鎸囬拡緗甆ULL浜х敓閲庢寚閽?
3)鏁扮粍鍜屾寚閽堢殑鍖哄埆
銆�1銆�鍐呭鐨勪慨鏀癸細
銆�銆�ex1:
          char a[]="hello";  //a涓哄瓧絎︽暟緇?
          a[0]='X';銆�銆�銆�銆�//a鐨勫唴瀹瑰彲浠ヤ慨鏀?
          cout<<a<<endl;銆�//杈撳嚭錛歑ello銆�
          char*p="hello";  //銆�P涓哄父閲忔寚閽堬紱
          p[0]='X';銆�銆�銆�銆�//*p涓嶈兘淇敼
          cout<<p<<endl;銆�銆�//紼嬪簭榪愯鍒拌繖閲屽嚭閿?
  2 鍐呭鐨勫鍒朵笌姣旇緝
    鑻ユ兂鎶婁竴涓瓧絎︽暟緇勭殑鍐呭璧嬬粰鍙︿竴涓暟緇剆trcpy(b,a);
      姣旇緝鐢╯trcmp(a,b);
      瀵規(guī)寚閽堟潵璇磒=a鐩稿綋浜庢妸a鐨勫湴鍧�緇檖錛岃嫢瑕佹嫹璐漛鐨勫唴瀹瑰緱鐢寵鍐呭瓨絀洪棿錛屽閲忎負strlen(a)+1錛屽啀鐢╯trcpy
      ex:
      int len=strlen(a);
      char*p=(char*)malloc(sizeof(char)*(len+1));
      strcpy(p,a);
      strcmp(p,a);
     璁＄畻鍐呭瓨瀹歸噺錛歴izeof()              !sizeof(p)涓?:鎸囬拡鍙橀噺鐨勫瓧鑺傛暟
銆� ex:
       char a[]="hello";
       sizeof(a);//6
       char*p=a;
       sizeof(p);//4
      void fun(char a[100])
     {
      sizeof(a);//4 鍥犱負浼犲弬鏃跺疄闄呬紶閫掔殑鏄暟緇勭殑棣栧湴鍧�錛屾暟緇勯��鍖栦負鎸囬拡
   }
4)鎸囬拡鍙傛暟鏄浣曚紶閫掑唴瀛樼殑
 1 涓嶈兘鎸囨湜鐢ㄥ嚱鏁板弬鏁拌〃涓殑鎸囬拡鍘葷敵璇峰唴瀛?
銆�銆�銆�鍒嗘瀽錛?
        void GetMemory(char*p,int num)
            {
              p=(char*)malloc(num*sizeof(char));
            }
           void Test()
          {
            char*str=NULL;
            GetMemory(str,100);
            strcpy(str,"hello");
            cout<<str<<endl;
          }
}
         紼嬪簭榪愯鍑洪敊錛宻tr榪樻槸NULL.浼犻�掑弬鏁版椂鍦ㄥ艦鍙傦及涓駭鐢熶簡str鍓湰錛屽嚱鏁扮粨鏉熷悗p闅忔鑰屾秷澶變絾鍒嗛厤鐨勫唴瀛樹負琚噴鏀撅紝鎵�浠ユ瘡璋冪敤涓�嬈″氨閫犳垚涓�嬈″唴瀛樻硠闇?
銆�2 鏀瑰彉涓婇潰鐨勯敊璇殑涓ょ鏂規(guī)硶錛?
銆�銆�銆�錛戜紶閫掓寚閽堢殑鎸囬拡錛?
銆�銆�銆�銆�銆�void getmemory(char**p,int num)
              {
                 *p=(char*)malloc(sizeof(char)*num);
              }
              void test()
              {
                 char*str;
                 getmemory(&str,100);
                 strcpy(str,"hello");
                 cout<<str<<endl;
                 free(str);
                 str=null;     
              }
         2 鐢ㄨ繑鍥炲�?
銆�銆�銆�銆�char*getmemory(int num)
            {
             char*p=(char*)malloc(sizeof(char)*num);
             return p;
            }
            void test()
           {
            char*str=NULL;
            str=getmemory(100);
            strcpy(str,"hello");
            cout<<str<<endl;
            free(str);
            str=NULL;
           }
       3 涓嶈兘鐢╮eturn榪斿洖鎸囧悜鏍堝唴瀛樼殑鎸囬拡錛?
銆�銆�銆�銆�銆�char*getmemory()
              {
                 char p[]="hello";
                 return p;
               }
              void test()
             {
                 char*str=NULL;
                 str=getmemory();
                 cout<<str<<endl;
                }
         鐢變簬錛版槸灞�閮ㄦ暟緇勶紝鍥犳鍙湁鍑芥暟浣滅敤錛岄殢鍑芥暟鐨勮皟鐢ㄧ粨鏉熻�屾秷澶憋紝str鎸囧悜鍨冨溇鍐呭瓨錛岄噹鎸囬拡
銆�銆�4 char*GetMemory()
         {
           char*p="hello";//p鏄父閲忔寚閽堬紝鍦╰est涓槸鍙鐨?
           return p;
         }
5)free/delete鍙槸鎶婃寚閽堟墍鎸囩殑鍐呭瓨閲婃斁鎺夛紝騫舵病鏈夋妸鎸囬拡鏈韓娑堥櫎鎺夛紝姝ゆ椂鎸囬拡涓嶇疆涓篘ULL錛岃鎸囬拡灝辨槸閲庢寚閽堬紝鍗充嬌鐢?p==null)涔熸病璧峰埌闃叉姢浣滅敤錛岃鎸囬拡鎸囩殑涓嶆槸鍚堟硶鐨勫唴瀛樺尯鍩?
銆�錛侊紒鎸囬拡娑堜骸浜嗗茍涓嶄唬琛ㄥ畠鎵�鎸囩殑鍐呭瓨絀洪棿琚噴鏀句簡
銆�錛侊紒鎸囬拡鎵�鎸囩殑鍐呭瓨絀洪棿琚噴鏀句簡騫朵笉浠ｈ〃鎸囬拡浼氭秷浜℃垨鍙樹負null
6)鏉滅粷閲庢寚閽堬細鎸囧悜鍨冨溇鍐呭瓨鐨勬寚閽?
銆�銆�褰㈡垚閲庢寚閽堢殑鍘熷洜錛?
銆�銆�銆�鎸囬拡鍙橀噺娌℃湁琚垵濮嬪寲
銆�銆�銆�鍦ㄨfree/delete鍚庢病鏈夊皢鎸囬拡緗畁ull錛岃浜鴻璁や負鏄悎娉曠殑鎸囬拡
銆�銆�銆�鎸囬拡鐨勬搷浣滆秴榪囦簡鍙橀噺鐨勪綔鐢ㄥ煙
7)malloc/free涓哄簱鍑芥暟錛屼笉鑳芥弧瓚抽潪鍐呴儴鏁版嵁綾誨瀷鐨勫璞★紝涓嶈兘鎵ц鏋勯�犲嚱鏁板拰鏋愭瀯鍑芥暟
8)鍐呭瓨鑰楀敖鎬庝箞鍔?
銆�濡傛灉鍦ㄧ敵璇峰唴瀛樻椂鎵句笉鍒拌凍澶熷ぇ鐨勫唴瀛樺潡錛宮alloc/new 浼氳繑鍥濶ULL鎸囬拡;
瀵圭瓥錛?
銆�鍒ゆ柇鏄惁涓篘ULL鎸囬拡錛屽鏋滀負null鐢╮eturn
   鐢╡xit(1)
   璁劇疆寮傚父澶勭悊
灝介噺鐢ㄧ浜岀鏂規(guī)硶鏉ュ鐞?
瀵逛簬錛擄紥浣嶄互涓婄殑搴旂敤紼嬪簭錛屾棤璁烘�庢牱浣跨敤malloc鍜宯ew錛屽嚑涔庝笉鑳藉鑷村唴瀛樿�楀敖        <img src ="http://www.shnenglu.com/zhuyuyuseu/aggbug/7131.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/zhuyuyuseu/" target="_blank">Gerrard</a> 2006-05-14 15:01 <a href="http://www.shnenglu.com/zhuyuyuseu/archive/2006/05/14/7131.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss>                                                                <footer>
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