锘??xml version="1.0" encoding="utf-8" standalone="yes"?>AV在线亚洲男人的天堂
,亚洲成人免费电影,亚洲女同成av人片在线观看 http://www.tkk7.com/lihao336/category/47963.html鎴愪簬鍧氬繊錛屾瘉浜庢誕韜?/description>zh-cn Wed, 14 Dec 2011 00:28:04 GMT Wed, 14 Dec 2011 00:28:04 GMT 60 [杞琞unix/linux涓殑dup()緋葷粺璋冪敤 http://www.tkk7.com/lihao336/archive/2011/12/13/366231.htmlcalvin calvin Tue, 13 Dec 2011 06:20:00 GMT http://www.tkk7.com/lihao336/archive/2011/12/13/366231.html http://www.tkk7.com/lihao336/comments/366231.html http://www.tkk7.com/lihao336/archive/2011/12/13/366231.html#Feedback 0 http://www.tkk7.com/lihao336/comments/commentRss/366231.html http://www.tkk7.com/lihao336/services/trackbacks/366231.html 聽聽聽 sys_dup()鐨勪富瑕佸伐浣滃氨鏄敤鏉モ滃鍒垛濅竴涓墦寮鐨勬枃浠跺彿錛屼嬌涓や釜鏂囦歡鍙烽兘鎸囧悜鍚屼竴涓枃浠躲傛棦鐒惰綆鍗曪紝鎴戜滑灝遍鍏堟潵鐪嬩竴涓嬪畠鐨勪唬鐮侊紙瀹氫箟鍦╢s/fcntl.c涓級(jí)錛?br />聽1 聽asmlinkage聽 long 聽sys_dup(unsigned聽 int 聽fildes) 聽2 聽{ 聽3 聽聽聽聽聽 int 聽ret聽 = 聽 - EBADF; 聽4 聽聽聽聽聽 struct 聽file聽 * 聽file聽 = 聽fget(fildes); 聽5 聽聽6 聽聽聽聽聽 if 聽(file) 聽7 聽聽聽聽聽聽聽聽聽ret聽 = 聽dupfd(file,聽 0 ); 聽8 聽聽聽聽聽 return 聽ret; 聽9 聽} 10 聽
鑰宻ys_dup()鐨勪富浣撴槸dupfd()錛堝畾涔夊湪鍚屼竴涓枃浠朵腑錛夛細(xì)聽1 聽static 聽 int 聽dupfd( struct 聽file聽 * file,聽 int 聽start) 聽2 聽{ 聽3 聽聽聽聽聽 struct 聽files_struct聽 * 聽files聽 = 聽current -> files; 聽4 聽聽聽聽聽 int 聽ret; 聽5 聽聽6 聽聽聽聽聽ret聽 = 聽locate_fd(files,聽file,聽start); 聽7 聽聽聽聽聽 if 聽(ret聽 < 聽 0 ) 聽8 聽聽聽聽聽聽聽聽聽 goto 聽out_putf; 聽9 聽聽聽聽聽allocate_fd(files,聽file,聽ret); 10 聽聽聽聽聽 return 聽ret; 11 聽12 聽out_putf: 13 聽聽聽聽聽write_unlock( & files -> file_lock); 14 聽聽聽聽聽fput(file); 15 聽聽聽聽聽 return 聽ret; 16 聽} 17 聽
娉細(xì)dup鍜宒up2鐨勫師鍨嬪涓嬶細(xì) #include <unistd.h> int dup(int file_descriptor); int dup2(int file_descriptor1, int file_descriptor2) dup榪斿洖鐨勬枃浠舵弿榪扮鎬繪槸鍙栨渶灝忕殑鍙敤鍊?br />dup2榪斿洖鐨勬枃浠舵弿榪扮鎴栬呬笌file_descriptor2鐩稿悓錛屾垨鑰呮槸絎竴涓ぇ浜庤鍙傛暟鐨勫彲鐢ㄥ箋?/font> 聽聽聽 鑰岃繖涔堜竴涓畝鍗曠殑緋葷粺璋冪敤鏄浣曞畬鎴愰噸瀹氬悜榪欎釜鑹板法鐨勪換鍔$殑鍛紵鎴戜滑涓嶅Θ鍏堢湅涓緥瀛愩?br />聽聽聽
褰撴垜浠湪shell涓嬭緭鍏ュ涓嬪懡浠わ細(xì)鈥渆cho
hello!鈥濓紝榪欐潯鍛戒護(hù)瑕佹眰shell榪涚▼鎵ц涓涓彲鎵ц鏂囦歡echo錛屽弬鏁頒負(fù)鈥渉ello!鈥濄傚綋shell鎺ユ敹鍒板懡浠や箣鍚庯紝鍏堟壘鍒?
bin/echo錛岀劧鍚巉ork()鍑轟竴涓瓙榪涚▼璁╀粬鎵цbin/echo錛屽茍灝嗗弬鏁頒紶閫掔粰瀹冿紝鑰岃繖涓繘紼嬩粠shell緇ф壙浜?jiǎn)涓変釜鏍囧噯鏂囦挥灱屽嵪x爣鍑嗚緭鍏?
錛坰tdin錛夛紝鏍囧噯杈撳嚭錛坰tdout錛夊拰鏍囧噯鍑洪敊淇℃伅錛坰tderr錛夛紝浠栦滑涓変釜鐨勬枃浠跺彿鍒嗗埆涓?銆?銆?銆?/font>鑰岃嚦浜巈cho榪涚▼鐨勫伐浣滃緢綆鍗曪紝灝辨槸灝嗗弬鏁扳渉ello!鈥濆啓鍒版爣鍑嗚緭鍑烘枃浠朵腑鍘伙紝閫氬父閮芥槸鎴戜滑鐨勬樉紺哄櫒涓娿備絾鏄鏋滄垜浠皢鍛戒護(hù)鏀規(guī)垚鈥渆cho hello! >
foo鈥濓紝鍒欏湪鎵ц鏃惰緭鍑哄皢浼?xì)琚噸瀹氬悜鍒凹倎鐩樻枃錃gfoo涓?font color="#0000FF">錛堟敞錛氶噸瀹氬悜浜庢枃浠舵弿榪扮鏈夊叧錛?/font>銆傛垜浠亣瀹氬湪姝や箣鍓嶈shell榪涚▼鍙湁涓変釜鏍囧噯鏂囦歡鎵撳紑錛屾枃浠跺彿鍒嗗埆涓?銆?銆?錛屼互涓婂懡浠よ灝嗘寜濡備笅搴忓垪鎵ц錛?br />聽聽聽 (1) 鎵撳紑鎴栧垱寤虹鐩樻枃浠秄oo錛屽鏋渇oo涓師鏉ユ湁鍐呭錛屽垯娓呴櫎鍘熸潵鍐呭錛屽叾鏂囦歡鍙蜂負(fù)3銆?br />聽聽聽 (2) 閫氳繃dup()澶嶅埗鏂囦歡stdout錛屽嵆灝嗘枃浠跺彿1鍑虹殑file緇撴瀯鎸囬拡澶嶅埗鍒版枃浠跺彿4澶勶紝鐩殑鏄皢stdout鐨刦ile鎸囬拡鏆傛椂淇濆瓨涓涓?br />聽聽聽 (3) 鍏抽棴stdout錛屽嵆1鍙鋒枃浠訛紝浣嗘槸鐢變簬4鍙鋒枃浠跺stdout涔熷悓鏃舵湁涓紩鐢紝鎵浠tdout鏂囦歡騫舵湭鐪熸鍏抽棴錛屽彧鏄吘鍑?鍙鋒枃浠跺彿浣嶇疆銆?br />聽聽聽 (4) 閫氳繃dup()錛屽鍒?鍙鋒枃浠訛紙鍗崇鐩樻枃浠秄oo錛夛紝鐢變簬1鍙鋒枃浠跺叧闂紝鍏朵綅緗┖緙猴紝鏁?鍙鋒枃浠惰澶嶅埗鍒?鍙鳳紝鍗寵繘紼嬩腑鍘熸潵鎸囧悜stdout鐨勬寚閽堟寚鍚戜簡(jiǎn)foo銆?br />聽聽聽
(5)
閫氳繃緋葷粺璋冪敤fork()鍜宔xec()鍒涘緩瀛愯繘紼嬪茍鎵цecho錛屽瓙榪涚▼鍦ㄦ墽琛宔cho鍓嶅鍏抽棴3鍙峰拰4鍙鋒枃浠訛紝鍙暀涓?銆?銆?涓変釜鏂囦歡錛岃娉ㄦ剰錛岃繖
鏃剁殑1鍙鋒枃浠跺凡緇忎笉鏄痵tdout鑰屾槸紓佺洏鏂囦歡foo浜?jiǎn)銆傚綋echo鎯沖悜stdout鏂囦歡鍐欏叆鈥渉ello!鈥濇椂鑷劧灝卞啓鍏ュ埌浜?jiǎn)foo涓?br />聽聽聽 (6) 鍥炲埌shell鍚庯紝鍏抽棴鎸囧悜foo鐨?鍙蜂笌3鍙鋒枃浠舵枃浠訛紝鍐嶇敤dup()鍜宑lose()灝?鍙鋒仮澶嶈嚦stdout錛岃繖鏍穝hell灝辨仮澶嶄簡(jiǎn)0銆?銆?涓変釜鏍囧噯杈撳叆/杈撳嚭鏂囦歡銆?br /> 聽聽聽
鐢辨鍙錛?font color="#FF0000">褰揺cho紼嬪簭錛堟垨鍏朵粬錛夊湪榪愯鐨勬椂鍊欏茍涓嶇煡閬搒tdout錛堝浜巗tdin鍜宻tderr鍚屾牱錛夋寚鍚戜粈涔堬紝榪涚▼涓庡疄闄呰緭鍑烘枃浠舵垨璁懼鐨勭粨鍚堟槸鍦ㄨ繍琛屾椂鐢卞叾鐖惰繘紼嬧滃寘鍔炩濈殑銆傝繖鏍峰氨綆鍖栦簡(jiǎn)瀛愯繘紼嬬殑紼嬪簭璁捐錛屽洜涓哄湪璁捐鏃跺彧瑕佽窡涓変釜閫昏緫涓婂瓨鍦ㄧ殑鏂囦歡鎵撲氦閬撳氨鍙互浜?/font>銆傚彲鑳芥湁浜轟細(xì)瑙夊緱榪欏緢鍍忛潰鍚戝璞′腑
鐨勫鎬佸拰閲嶈澆錛屾病鏈変粈涔堟柊濂囦箣澶勶紝浣嗘槸濡傛灉浣犳椿鍦?0鐢氳嚦40騫村墠錛屽彲鑳戒綘浼?xì)鏀瑰彉浣犵殑鐪嬫硶銆偮?
]]> 灝忕瀛樺偍鍜屽ぇ绔瓨鍌?/title> http://www.tkk7.com/lihao336/archive/2011/11/15/363850.htmlcalvin calvin Tue, 15 Nov 2011 07:36:00 GMT http://www.tkk7.com/lihao336/archive/2011/11/15/363850.html http://www.tkk7.com/lihao336/comments/363850.html http://www.tkk7.com/lihao336/archive/2011/11/15/363850.html#Feedback 0 http://www.tkk7.com/lihao336/comments/commentRss/363850.html http://www.tkk7.com/lihao336/services/trackbacks/363850.html 聽聽聽鍒ゆ柇灝忕榪樻槸澶х瑙勫垯鐨勬柟娉曪細(xì)
int x = 1;if(*(char *)&x == 1)//鍙杧鎸囬拡寮哄埗杞崲涓篶har*綾誨瀷鍐嶅彇鍊鹼紝姝ゆ椂鍙栧埌鐨勫兼槸int鏈浣庡瓧鑺傚?br />聽聽聽聽printf(鈥渓ittle-endian\n鈥?;else聽聽聽聽printf(鈥渂ig-endian\n鈥?;
聽聽聽聽鍙﹀琛ュ厖錛?/wbr>
1錛嶣IG-ENDIAN銆丩ITTLE-ENDIAN銆佽窡CPU鏈夊叧鐨勶紝姣忎竴縐岰PU涓嶆槸BIG-ENDIAN灝辨槸LITTLE-
ENDIAN銆併侷A鏋舵瀯鐨凜PU涓槸Little-Endian錛岃孭owerPC
銆丼PARC鍜孧otorola澶勭悊鍣ㄣ傝繖鍏跺疄灝辨槸鎵璋撶殑涓繪満瀛楄妭搴忋傝岀綉緇滃瓧鑺傚簭鏄寚鏁版嵁鍦ㄧ綉緇滀笂浼犺緭鏃舵槸澶уご榪樻槸灝忓ご鐨勶紝鍦↖nternet鐨勭綉緇滃瓧
鑺傚簭鏄疊IG-ENDIAN銆傛墍璋撶殑JAVA瀛楄妭搴忔寚鐨勬槸鍦↗AVA铏氭嫙鏈轟腑澶氬瓧鑺傜被鍨嬫暟鎹殑瀛樻斁欏哄簭錛孞AVA瀛楄妭搴忎篃鏄疊IG-ENDIAN銆?/p>
2錛庢墍浠ュ湪鐢–/C++鍐欓氫俊紼嬪簭鏃訛紝鍦ㄥ彂閫佹暟鎹墠鍔″繀鐢╤tonl鍜宧tons鍘繪妸鏁村瀷鍜岀煭鏁村瀷鐨勬暟鎹繘琛屼粠涓繪満瀛楄妭搴忓埌緗戠粶瀛楄妭搴忕殑杞崲錛岃屾帴
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搴忔椂錛屽垯闇瑕佸湪C/C++涓渚т嬌鐢ㄤ互涓婂嚑涓柟娉曡繘琛屽瓧鑺傚簭鐨勮漿鎹紝鑰孞AVA涓渚э紝鍒欎笉闇瑕佸仛浠諱綍澶勭悊錛屽洜涓篔AVA瀛楄妭搴忎笌緗戠粶瀛楄妭搴忛兘鏄疊IG-
ENDIAN錛屽彧瑕丆/C++涓渚ц兘姝g‘榪涜杞崲鍗沖彲錛堝彂閫佸墠浠庝富鏈哄簭鍒扮綉緇滃簭錛屾帴鏀舵椂鍙嶅彉鎹級(jí)銆傚鏋滈氫俊鐨勫弻鏂歸兘鏄疛AVA錛屽垯鏍規(guī)湰涓嶇敤鑰冭檻瀛楄妭搴忕殑闂?
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杞嚜http://www.embest.net/index.php/archives/259
]]>socket绔彛bind闂 http://www.tkk7.com/lihao336/archive/2011/09/11/358464.htmlcalvin calvin Sun, 11 Sep 2011 15:47:00 GMT http://www.tkk7.com/lihao336/archive/2011/09/11/358464.html http://www.tkk7.com/lihao336/comments/358464.html http://www.tkk7.com/lihao336/archive/2011/09/11/358464.html#Feedback 0 http://www.tkk7.com/lihao336/comments/commentRss/358464.html http://www.tkk7.com/lihao336/services/trackbacks/358464.html $ netstat -tln Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address聽聽聽聽聽聽聽聽聽聽 Foreign Address聽聽聽聽聽聽聽聽 State聽聽聽聽聽 聽聽 tcp聽聽聽聽聽聽聽 0聽聽聽聽聽 0 127.0.0.1:631聽聽聽聽聽聽聽聽聽聽 0.0.0.0:*聽聽聽聽聽聽聽聽聽聽聽聽聽聽 LISTEN聽聽聽聽 tcp聽聽聽聽聽聽聽 0聽聽聽聽聽 0 0.0.0.0:40700聽聽聽聽聽聽聽聽聽聽 0.0.0.0:*聽聽聽聽聽聽聽聽聽聽聽聽聽聽 LISTEN聽 聽聽聽 tcp6聽聽聽聽聽聽 0聽聽聽聽聽 0 ::1:631聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 :::*聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 LISTEN 鏄劇ず娌ind鍒?3绔彛錛屽嵈bind鍒頒簡(jiǎn)涓涓殢鏈虹殑绔彛40700涓娿?br />鍚庢潵蹇界劧鎰忚瘑鍒?-1023鏄繚鐣欑鍙e彿錛屾槸涓嶆槸鍥犱負(fù)13灞炰簬reserved port鐨勫師鍥狅紵 淇敼bind绔彛涓?000鍚庯紝鏋滅劧鍙互bind浜?jiǎn)銆?br /> 鍘熸潵1-1023鏄痳eserved port鏄互榪欑鏂瑰紡瀹炵幇鐨勶紝鑰屼互root鏉冮檺榪愯紼嬪簭錛屽垯鍙互bind涓?023浠ヤ笅鐨勭鍙c?br /> 榪欑瘒鏂囩珷涓嶉敊鐨勶細(xì)http://www.cnblogs.com/zhangleiccst/archive/2011/05/14/2046465.html ]]> [杞琞sprintf snprintf strcpy memcpy 鍖哄埆鍙?qiáng)搴旂?/title> http://www.tkk7.com/lihao336/archive/2011/09/11/358442.htmlcalvin calvin Sun, 11 Sep 2011 06:45:00 GMT http://www.tkk7.com/lihao336/archive/2011/09/11/358442.html http://www.tkk7.com/lihao336/comments/358442.html http://www.tkk7.com/lihao336/archive/2011/09/11/358442.html#Feedback 0 http://www.tkk7.com/lihao336/comments/commentRss/358442.html http://www.tkk7.com/lihao336/services/trackbacks/358442.html 鍏充簬sprintf鍜宻nprintf鐨勬紜嬌鐢?br />
鑰冭檻浠ヤ笅鏈夌己闄風(fēng)殑渚嬪瓙錛?br />
void f(const char *p)
{
char buf[11]={0};
sprintf(buf,"%10s",p); // very dangerous
printf("%sn",buf);
}
涓嶈璁╂牸寮忔爣璁扳?10s鈥濊瀵間綘銆傚鏋減鐨勯暱搴﹀ぇ浜?0涓瓧絎︼紝閭d箞 sprintf() 鐨勫啓鎿嶄綔灝變細(xì)瓚婅繃buf鐨勮竟鐣岋紝浠庤屼駭鐢熶竴涓紦鍐插尯婧㈠嚭銆?br />
媯(gè)嫻嬭繖綾葷己闄峰茍涓嶅鏄擄紝鍥犱負(fù)瀹冧滑鍙湪 p 鐨勯暱搴﹀ぇ浜?0涓瓧絎︾殑鏃跺欐墠浼?xì)鍙戠敓銆傞粦瀹㈤氬父鍒╃敤榪欑被鑴嗗急鐨勪唬鐮佹潵鍏ヤ鏡鐪嬩笂鍘誨畨鍏ㄧ殑緋葷粺銆?br />
瑕佷慨姝h繖涓緙洪櫡錛?b>鍙互浣跨敤鍑芥暟 snprintf()浠f浛鍑芥暟sprintf()銆?br />
鍑芥暟鍘熷瀷錛歩nt snprintf(char *dest, size_t n, const char *fmt, ...);
鍑芥暟璇存槑: 鏈澶氫粠婧愪覆涓嫹璐漬錛?涓瓧絎﹀埌鐩爣涓蹭腑錛岀劧鍚庡啀鍦ㄥ悗闈㈠姞涓涓?銆傛墍浠ュ鏋滅洰鏍囦覆鐨勫ぇ灝忎負(fù)n鐨勮瘽錛屽皢涓嶄細(xì)婧㈠嚭銆?br />
鍑芥暟榪斿洖鍊? 鑻ユ垚鍔熷垯榪斿洖瀛樺叆鏁扮粍鐨勫瓧絎︽暟錛岃嫢緙栫爜鍑洪敊鍒欒繑鍥炶礋鍊箋?br />
鎺ㄨ崘鐨勭敤娉曪細(xì)
void f(const char *p)
{
char buf[11]={0};
snprintf(buf, sizeof(buf), "%10s", p); // 娉ㄦ剰錛氳繖閲岀2涓弬鏁板簲褰撶敤sizeof(str)錛岃屼笉瑕佷嬌鐢ㄧ‖緙栫爜11錛屼篃涓嶅簲褰撲嬌鐢╯izeof(str)-1鎴?0
printf("%sn",buf);
}
strcpy 鍑芥暟鎿嶄綔鐨勫璞℃槸 瀛楃涓?/font>錛屽畬鎴?浠? 婧愬瓧絎︿覆 鍒?鐩殑瀛楃涓?鐨?鎷瘋礉 鍔熻兘銆?br />
snprintf 鍑芥暟鎿嶄綔鐨勫璞?涓嶉檺浜庡瓧絎︿覆 錛氳櫧鐒剁洰鐨勫璞℃槸瀛楃涓詫紝浣嗘槸婧愬璞″彲浠ユ槸瀛楃涓層佷篃鍙互鏄換鎰忓熀鏈被鍨嬬殑鏁版嵁銆傝繖涓嚱鏁頒富瑕佺敤鏉ュ疄鐜?錛堝瓧絎︿覆鎴栧熀鏈暟鎹被鍨嬶級(jí)鍚?瀛楃涓?鐨勮漿鎹?/font>鍔熻兘銆傚鏋滄簮瀵硅薄鏄瓧絎︿覆錛屽茍涓旀寚瀹?%s 鏍煎紡絎︼紝涔熷彲瀹炵幇瀛楃涓叉嫹璐濆姛鑳姐?br />
memcpy 鍑芥暟欏懼悕鎬濅箟灝辨槸 鍐呭瓨鎷瘋礉 錛屽疄鐜?灝嗕竴涓? 鍐呭瓨鍧?鐨勫唴瀹瑰鍒跺埌鍙︿竴涓?鍐呭瓨鍧?/font> 榪欎竴鍔熻兘銆傚唴瀛樺潡鐢卞叾棣栧湴鍧浠ュ強(qiáng)闀垮害紜畾銆傜▼搴忎腑鍑虹幇鐨勫疄浣撳璞★紝涓嶈鏄粈涔堢被鍨嬶紝鍏舵渶緇堣〃鐜板氨鏄湪鍐呭瓨涓崰鎹竴甯箣鍦幫紙涓涓唴瀛樺尯闂存垨鍧楋級(jí)銆傚洜姝わ紝memcpy 鐨勬搷浣滃璞′笉灞闄愪簬鏌愪竴綾繪暟鎹被鍨嬶紝鎴栬呰鍙?閫傜敤浜庝換鎰忔暟鎹被鍨?/font>錛屽彧瑕佽兘緇欏嚭瀵硅薄鐨勮搗濮嬪湴鍧鍜屽唴瀛橀暱搴︿俊鎭佸茍涓斿璞″叿鏈夊彲鎿嶄綔鎬у嵆鍙傞壌浜?memcpy 鍑芥暟絳夐暱鎷瘋礉鐨勭壒鐐逛互鍙?qiáng)鏁版嵁绫诲瀷浠h〃鐨勭墿鐞嗘剰涔夊Q宮emcpy 鍑芥暟閫氬父闄愪簬鍚岀綾誨瀷鏁版嵁鎴栧璞′箣闂寸殑鎷瘋礉錛屽叾涓綋鐒朵篃鍖呮嫭瀛楃涓叉嫹璐濅互鍙?qiáng)鍩烘湰鏁版嵁绫诲瀷鐨勬嫰偞濄?br />
瀵逛簬瀛楃涓叉嫹璐濇潵璇達(dá)紝鐢ㄤ笂榪頒笁涓嚱鏁伴兘鍙互瀹炵幇錛屼絾鏄叾瀹炵幇鐨勬晥鐜囧拰浣跨敤鐨勬柟渚跨▼搴︿笉鍚岋細(xì)strcpy 鏃犵枒鏄渶鍚堥傜殑閫夋嫨錛氭晥鐜囬珮涓旇皟鐢ㄦ柟渚褲?/li> snprintf 瑕侀澶栨寚瀹氭牸寮忕騫朵笖榪涜鏍煎紡杞寲錛岄夯鐑?chǔ)涓旀晥鐜囦笉楂樸?/li> memcpy
铏界劧楂樻晥錛屼絾鏄渶瑕侀澶栨彁渚涙嫹璐濈殑鍐呭瓨闀垮害榪欎竴鍙傛暟錛屾槗閿欎笖浣跨敤涓嶄究錛涘茍涓斿鏋滈暱搴︽寚瀹氳繃澶х殑璇濓紙鏈浼橀暱搴︽槸婧愬瓧絎︿覆闀垮害 +
1錛夛紝榪樹細(xì)甯︽潵鎬ц兘鐨勪笅闄嶃傚叾瀹?strcpy 鍑芥暟涓鑸槸鍦ㄥ唴閮ㄨ皟鐢?memcpy 鍑芥暟鎴栬呯敤姹囩紪鐩存帴瀹炵幇鐨勶紝浠ヨ揪鍒伴珮鏁堢殑鐩殑銆傚洜姝わ紝浣跨敤
memcpy 鍜?strcpy 鎷瘋礉瀛楃涓插湪鎬ц兘涓婂簲璇ユ病鏈変粈涔堝ぇ鐨勫樊鍒?/li>
瀵逛簬闈炲瓧絎︿覆綾誨瀷鐨勬暟鎹殑澶嶅埗鏉ヨ錛宻trcpy 鍜?snprintf 涓鑸氨鏃犺兘涓哄姏浜?jiǎn)锛屽彲鏄?memcpy
鍗存病鏈変粈涔堝獎(jiǎng)鍝嶃備絾鏄紝瀵逛簬鍩烘湰鏁版嵁綾誨瀷鏉ヨ錛屽敖綆″彲浠ョ敤 memcpy
榪涜鎷瘋礉錛岀敱浜庢湁璧嬪艱繍綆楃鍙互鏂逛究涓旈珮鏁堝湴榪涜鍚岀鎴栧吋瀹圭被鍨嬬殑鏁版嵁涔嬮棿鐨勬嫹璐濓紝鎵浠ヨ繖縐嶆儏鍐典笅 memcpy 鍑犱箮涓嶈浣跨敤銆俶emcpy
鐨勯暱澶勬槸鐢ㄦ潵瀹炵幇錛堥氬父鏄唴閮ㄥ疄鐜板眳澶氾級(jí)瀵圭粨鏋勬垨鑰呮暟緇勭殑鎷瘋礉錛屽叾鐩殑鏄垨鑰呴珮鏁堬紝鎴栬呬嬌鐢ㄦ柟渚匡紝鐢氭垨涓よ呭吋鏈夈?br />
strcpy鍜宮emcpy鍔熻兘涓婁篃鏈変簺宸埆錛?br />
姣斿:
const char *str1="abc\0def";
char str2[7];
棣栧厛鐢╯trcpy瀹炵幇錛?br />
strcpy錛坰tr2,str1錛?br />
寰楀埌緇撴灉錛歴tr2錛?abc";涔熷氨鏄錛宻trcpy鏄互'\0'涓虹粨鏉熸爣蹇楃殑銆?br />
鍐嶇敤memcpy瀹炵幇錛?br />
memset(str2,7);
memcpy(str2,str1,7);
寰楀埌緇撴灉錛歴tr2="abc\0def";
涔熷氨鏄錛宮emcpy鏄鍐呭瓨鍖哄煙鐨勫鍒躲傚綋鐒?dòng)灱屼笉浠呰兘澶熷鍒跺瓧绗︿覆鏁熬l勶紝鑰屼笖鑳藉澶嶅埗鏁村瀷鏁扮粍絳夊叾浠栨暟緇勩?img src ="http://www.tkk7.com/lihao336/aggbug/358442.html" width = "1" height = "1" /> ]]> [杞琞C/C++ void 鐞嗚В http://www.tkk7.com/lihao336/archive/2011/09/08/358280.htmlcalvin calvin Thu, 08 Sep 2011 03:12:00 GMT http://www.tkk7.com/lihao336/archive/2011/09/08/358280.html http://www.tkk7.com/lihao336/comments/358280.html http://www.tkk7.com/lihao336/archive/2011/09/08/358280.html#Feedback 0 http://www.tkk7.com/lihao336/comments/commentRss/358280.html http://www.tkk7.com/lihao336/services/trackbacks/358280.html 銆1.姒傝堪 銆銆璁稿鍒濆鑰呭C/C++璇█涓殑void鍙?qiáng)void鎸囬拡綾誨瀷涓嶇敋鐞嗚В錛屽洜姝ゅ湪浣跨敤涓婂嚭鐜頒簡(jiǎn)涓浜涢敊璇傛湰鏂囧皢瀵箆oid鍏抽敭瀛楃殑娣卞埢鍚箟榪涜瑙h錛屽茍璇﹁堪void鍙?qiáng)void鎸囬拡綾誨瀷鐨勪嬌鐢ㄦ柟娉曚笌鎶宸с?br /> 銆銆2.void鐨勫惈涔?br /> 聽聽聽聽聽聽聽 void鐨勫瓧闈㈡剰鎬濇槸鈥滄棤綾誨瀷鈥濓紝void *鍒欎負(fù)鈥滄棤綾誨瀷鎸囬拡鈥濓紝void *鍙互鎸囧悜浠諱綍綾誨瀷鐨勬暟鎹?br /> 銆銆void鍑犱箮鍙湁鈥滄敞閲娾濆拰闄愬埗紼嬪簭鐨勪綔鐢紝鍥犱負(fù)浠庢潵娌℃湁浜轟細(xì)瀹氫箟涓涓獀oid鍙橀噺錛岃鎴戜滑璇曠潃鏉ュ畾涔夛細(xì) 聽聽聽聽聽聽聽 void a; 銆銆榪欒璇彞緙栬瘧鏃朵細(xì)鍑洪敊錛屾彁紺衡渋llegal use of type 'void'鈥濄備笉榪囷紝鍗充嬌void a鐨勭紪璇戜笉浼?xì)鍑洪敊锛屽畠涔熸病鏈変恢M綍瀹為檯鎰忎箟銆?br /> 銆銆void鐪熸鍙戞尌鐨勪綔鐢ㄥ湪浜庯細(xì)銆銆錛?錛?瀵瑰嚱鏁拌繑鍥炵殑闄愬畾錛?br />銆銆錛?錛?瀵瑰嚱鏁板弬鏁扮殑闄愬畾銆?/b> 銆銆鎴戜滑灝嗗湪絎笁鑺傚浠ヤ笂浜岀偣榪涜鍏蜂綋璇存槑銆?br /> 銆銆浼楁墍鍛ㄧ煡錛屽鏋滄寚閽坧1鍜宲2鐨勭被鍨嬬浉鍚岋紝閭d箞鎴戜滑鍙互鐩存帴鍦╬1鍜宲2闂翠簰鐩歌祴鍊鹼紱濡傛灉p1鍜宲2鎸囧悜涓嶅悓鐨勬暟鎹被鍨嬶紝鍒欏繀欏諱嬌鐢ㄥ己鍒剁被鍨嬭漿鎹㈣繍綆楃鎶婅祴鍊艱繍綆楃鍙寵竟鐨勬寚閽堢被鍨嬭漿鎹負(fù)宸﹁竟鎸囬拡鐨勭被鍨嬨?br /> 銆銆渚嬪錛?br /> float *p1; int *p2; p1 = p2; 銆銆鍏朵腑p1 = p2璇彞浼?xì)缂栬瘧鍑洪敊锛屾彁绀衡?=' : cannot convert from 'int *' to 'float *'鈥濓紝蹇呴』鏀逛負(fù)錛?br /> p1 = (float *)p2; 鑰寁oid *鍒欎笉鍚岋紝浠諱綍綾誨瀷鐨勬寚閽堥兘鍙互鐩存帴璧嬪肩粰瀹冿紝鏃犻渶榪涜寮哄埗綾誨瀷杞崲錛?br /> void *p1; int *p2; p1 = p2; 浣嗚繖騫朵笉鎰忓懗鐫錛寁oid *涔熷彲浠ユ棤闇寮哄埗綾誨瀷杞崲鍦拌祴緇欏叾瀹冪被鍨嬬殑鎸囬拡銆傚洜涓衡滄棤綾誨瀷鈥濆彲浠ュ寘瀹光滄湁綾誨瀷鈥濓紝鑰屸滄湁綾誨瀷鈥濆垯涓嶈兘鍖呭鈥滄棤綾誨瀷鈥濄傞亾鐞嗗緢綆鍗曪紝鎴戜滑鍙互璇粹滅敺浜哄拰濂充漢閮芥槸浜衡濓紝浣嗕笉鑳借鈥滀漢鏄敺浜衡濇垨鑰呪滀漢鏄コ浜衡濄備笅闈㈢殑璇彞緙栬瘧鍑洪敊錛?br /> void *p1; int *p2; p2 = p1; 銆銆鎻愮ず鈥?=' : cannot convert from 'void *' to 'int *'鈥濄?br /> 3.void鐨勪嬌鐢?br /> 銆銆涓嬮潰緇欏嚭void鍏抽敭瀛楃殑浣跨敤瑙勫垯錛?br />銆銆瑙勫垯涓 濡傛灉鍑芥暟娌℃湁榪斿洖鍊鹼紝閭d箞搴斿0鏄庝負(fù)void綾誨瀷 銆銆鍦–璇█涓紝鍑′笉鍔犺繑鍥炲肩被鍨嬮檺瀹氱殑鍑芥暟錛屽氨浼?xì)琚~栬瘧鍣ㄤ綔涓鴻繑鍥炴暣鍨嬪煎鐞嗐?/b>浣嗘槸璁稿紼嬪簭鍛樺嵈璇互涓哄叾涓簐oid綾誨瀷銆備緥濡傦細(xì) add ( int a, int b ) { return a + b; } int main(int argc, char* argv[]) { printf ( "2 + 3 = %d", add ( 2, 3) ); } 銆銆紼嬪簭榪愯鐨勭粨鏋滀負(fù)杈撳嚭錛?br />銆銆2 + 3 = 5 銆銆榪欒鏄庝笉鍔犺繑鍥炲艱鏄庣殑鍑芥暟鐨勭‘涓篿nt鍑芥暟銆?br /> 銆銆鏋楅攼鍗氬+銆婇珮璐ㄩ噺C/C++緙栫▼銆嬩腑鎻愬埌錛氣淐++璇█鏈夊緢涓ユ牸鐨勭被鍨嬪畨鍏ㄦ鏌ワ紝涓嶅厑璁鎬笂榪版儏鍐碉紙鎸囧嚱鏁頒笉鍔犵被鍨嬪0鏄庯級(jí)鍙戠敓鈥濄傚彲鏄紪璇戝櫒騫朵笉涓瀹氳繖涔堣瀹氾紝璀鍦╒isual C++6.0涓笂榪癮dd鍑芥暟鐨勭紪璇戞棤閿欎篃鏃犺鍛婁笖榪愯姝g‘錛屾墍浠ヤ笉鑳藉瘎甯屾湜浜庣紪璇戝櫒浼?xì)鍋氫弗鏍肩殑绫诲瀷妫鏌ャ?br /> 銆銆鍥犳錛屼負(fù)浜?jiǎn)閬垮厤尕滀贡锛屾垜浠湪缂栧啓C(jī)/C++紼嬪簭鏃訛紝瀵逛簬浠諱綍鍑芥暟閮藉繀欏諱竴涓笉婕忓湴鎸囧畾鍏剁被鍨嬨傚鏋滃嚱鏁版病鏈夎繑鍥炲鹼紝涓瀹氳澹版槑涓簐oid綾誨瀷 銆傝繖鏃㈡槸紼嬪簭鑹ソ鍙鎬х殑闇瑕侊紝涔熸槸緙栫▼瑙勮寖鎬х殑瑕佹眰銆傚彟澶栵紝鍔犱笂void綾誨瀷澹版槑鍚庯紝涔熷彲浠ュ彂鎸ヤ唬鐮佺殑鈥滆嚜娉ㄩ噴鈥濅綔鐢ㄣ備唬鐮佺殑鈥滆嚜娉ㄩ噴鈥濆嵆浠g爜鑳借嚜宸辨敞閲婅嚜宸便?br /> 鍦–++璇█涓0鏄庝竴涓繖鏍風(fēng)殑鍑芥暟錛?br /> int function(void) { return 1; } 銆銆鍒欒繘琛屼笅闈㈢殑璋冪敤鏄笉鍚堟硶鐨勶細(xì) function(2); 鍥犱負(fù)鍦–++涓紝鍑芥暟鍙傛暟涓簐oid鐨勬剰鎬濇槸榪欎釜鍑芥暟涓嶆帴鍙椾換浣曞弬鏁般?br /> 銆銆鎴戜滑鍦═urbo C 2.0涓紪璇戯細(xì) #include "stdio.h" fun() { return 1; } main() { printf("%d",fun(2)); getchar(); } 銆銆緙栬瘧姝g‘涓旇緭鍑?錛岃繖璇存槑錛屽湪C璇█涓紝鍙互緇欐棤鍙傛暟鐨勫嚱鏁頒紶閫佷換鎰忕被鍨嬬殑鍙傛暟錛屼絾鏄湪C++緙栬瘧鍣ㄤ腑緙栬瘧鍚屾牱鐨勪唬鐮佸垯浼?xì)鍑洪敊銆傚湪C++涓紝涓嶈兘鍚戞棤鍙傛暟鐨勫嚱鏁頒紶閫佷換浣曞弬鏁幫紝鍑洪敊鎻愮ず鈥?fun' : function does not take 1 parameters鈥濄?br /> 銆銆鎵浠ワ紝鏃犺鍦–榪樻槸C++涓紝鑻ュ嚱鏁頒笉鎺ュ彈浠諱綍鍙傛暟錛屼竴瀹氳鎸囨槑鍙傛暟涓簐oid銆?br /> 銆銆瑙勫垯浜?灝忓績(jī)浣跨敤void鎸囬拡綾誨瀷 銆銆鎸夌収ANSI(American National Standards Institute)鏍囧噯錛屼笉鑳藉void鎸囬拡榪涜綆楁硶鎿嶄綔錛屽嵆涓嬪垪鎿嶄綔閮芥槸涓嶅悎娉曠殑錛?br /> void * pvoid; pvoid++; //ANSI錛氶敊璇?br />pvoid += 1; //ANSI錛氶敊璇?br />//ANSI鏍囧噯涔嬫墍浠ヨ繖鏍瘋瀹氾紝鏄洜涓哄畠鍧氭寔錛氳繘琛岀畻娉曟搷浣滅殑鎸囬拡蹇呴』鏄‘瀹氱煡閬撳叾鎸囧悜鏁版嵁綾誨瀷澶у皬鐨勩?br />//渚嬪錛?br />int *pint; pint++; //ANSI錛氭紜?br /> 銆銆pint++鐨勭粨鏋滄槸浣垮叾澧炲ぇsizeof(int)銆?br /> 銆銆浣嗘槸澶у悕榧庨紟鐨凣NU(GNU's Not Unix鐨勭緝鍐?鍒欎笉榪欎箞璁ゅ畾錛屽畠鎸囧畾void *鐨勭畻娉曟搷浣滀笌char *涓鑷淬?br /> 鍥犳涓嬪垪璇彞鍦℅NU緙栬瘧鍣ㄤ腑鐨嗘紜細(xì) pvoid++; //GNU錛氭紜?br />pvoid += 1; //GNU錛氭紜?br />pvoid++鐨勬墽琛岀粨鏋滄槸鍏跺澶т簡(jiǎn)1 銆?br /> 銆銆鍦ㄥ疄闄呯殑紼嬪簭璁捐涓紝涓鴻繋鍚圓NSI鏍囧噯錛屽茍鎻愰珮紼嬪簭鐨勫彲縐繪鎬э紝鎴戜滑鍙互榪欐牱緙栧啓瀹炵幇鍚屾牱鍔熻兘鐨勪唬鐮侊細(xì) void * pvoid; (char *)pvoid++; //ANSI錛氭紜紱GNU錛氭紜?br />(char *)pvoid += 1; //ANSI錛氶敊璇紱GNU錛氭紜?br /> 銆銆GNU鍜孉NSI榪樻湁涓浜涘尯鍒紝鎬諱綋鑰岃█錛孏NU杈傾NSI鏇粹滃紑鏀鋸濓紝鎻愪緵浜?jiǎn)瀵规洿澶氳娉曠殑鏀寔銆備絾鏄垜浠湪鐪熷疄璁捐鏃訛紝榪樻槸搴旇灝藉彲鑳藉湴榪庡悎ANSI鏍囧噯銆?br /> 銆銆瑙勫垯鍥?濡傛灉鍑芥暟鐨勫弬鏁板彲浠ユ槸浠繪剰綾誨瀷鎸囬拡錛岄偅涔堝簲澹版槑鍏跺弬鏁頒負(fù)void * 銆銆鍏稿瀷鐨勫鍐呭瓨鎿嶄綔鍑芥暟memcpy鍜宮emset鐨勫嚱鏁板師鍨嬪垎鍒負(fù)錛?br /> void * memcpy(void *dest, const void *src, size_t len); void * memset ( void * buffer, int c, size_t num ); 銆銆榪欐牱錛屼換浣曠被鍨嬬殑鎸囬拡閮藉彲浠ヤ紶鍏emcpy鍜宮emset涓紝榪欎篃鐪熷疄鍦頒綋鐜頒簡(jiǎn)鍐呭瓨鎿嶄綔鍑芥暟鐨勬剰涔夛紝鍥犱負(fù)瀹冩搷浣滅殑瀵硅薄浠呬粎鏄竴鐗囧唴瀛橈紝鑰屼笉璁鴻繖鐗囧唴瀛樻槸浠涔堢被鍨嬨傚鏋渕emcpy鍜宮emset鐨勫弬鏁扮被鍨嬩笉鏄痸oid *錛岃屾槸char *錛岄偅鎵嶅彨鐪熺殑濂囨簡(jiǎn)錛佽繖鏍風(fēng)殑memcpy鍜宮emset鏄庢樉涓嶆槸涓涓滅函綺圭殑錛岃劚紱諱綆綰ц叮鍛崇殑鈥濆嚱鏁幫紒 涓嬮潰鐨勪唬鐮佹墽琛屾紜細(xì) //紺轟緥錛歮emset鎺ュ彈浠繪剰綾誨瀷鎸囬拡 int intarray[100]; memset ( intarray, 0, 100*sizeof(int) ); //灝唅ntarray娓? //紺轟緥錛歮emcpy鎺ュ彈浠繪剰綾誨瀷鎸囬拡 int intarray1[100], intarray2[100]; memcpy ( intarray1, intarray2, 100*sizeof(int) ); //灝唅ntarray2鎷瘋礉緇檌ntarray1 銆銆鏈夎叮鐨勬槸錛宮emcpy鍜宮emset鍑芥暟榪斿洖鐨勪篃鏄痸oid *綾誨瀷錛屾爣鍑嗗簱鍑芥暟鐨勭紪鍐欒呮槸澶氫箞鍦板瘜鏈夊闂晩錛?br /> 銆銆瑙勫垯浜?void涓嶈兘浠h〃涓涓湡瀹炵殑鍙橀噺 銆銆涓嬮潰浠g爜閮戒紒鍥捐void浠h〃涓涓湡瀹炵殑鍙橀噺錛屽洜姝ら兘鏄敊璇殑浠g爜錛?br /> void a; //閿欒 function(void a); //閿欒 銆銆void浣撶幇浜?jiǎn)涓縐嶆娊璞★紝榪欎釜涓栫晫涓婄殑鍙橀噺閮芥槸鈥滄湁綾誨瀷鈥濈殑錛岃濡備竴涓漢涓嶆槸鐢蜂漢灝辨槸濂充漢錛堣繕鏈変漢濡栵紵錛夈?br /> 銆銆void鐨勫嚭鐜板彧鏄負(fù)浜?jiǎn)涓縐嶆娊璞$殑闇瑕侊紝濡傛灉浣犳紜湴鐞嗚В浜?jiǎn)闈㈠悜瀵硅薄涓滄娊璞″熀綾燴濈殑姒傚康錛屼篃寰堝鏄撶悊瑙oid鏁版嵁綾誨瀷銆傛濡備笉鑳界粰鎶借薄鍩虹被瀹氫箟涓涓疄渚嬶紝鎴戜滑涔熶笉鑳藉畾涔変竴涓獀oid錛堣鎴戜滑綾繪瘮鐨勭Оvoid涓衡滄娊璞℃暟鎹被鍨嬧濓級(jí)鍙橀噺銆?br /> 4.鎬葷粨 銆銆灝忓皬鐨剉oid钑磋棌鐫寰堜赴瀵岀殑璁捐鍝插錛屼綔涓轟竴鍚嶇▼搴忚璁′漢鍛橈紝瀵歸棶棰樿繘琛屾繁涓涓眰嬈$殑鎬濊冨繀鐒朵嬌鎴戜滑鍙楃泭鍖祬銆? ]]> main鍑芥暟鍙傛暟鐨勬剰涔?/title> http://www.tkk7.com/lihao336/archive/2011/03/02/345526.htmlcalvin calvin Wed, 02 Mar 2011 13:33:00 GMT http://www.tkk7.com/lihao336/archive/2011/03/02/345526.html http://www.tkk7.com/lihao336/comments/345526.html http://www.tkk7.com/lihao336/archive/2011/03/02/345526.html#Feedback 0 http://www.tkk7.com/lihao336/comments/commentRss/345526.html http://www.tkk7.com/lihao336/services/trackbacks/345526.html
main()鍑芥暟涓鑸敤int鎴栬卾oid褰㈢殑銆傛垜姣旇緝鍠滄鐢╥nt鍨嬪畾涔塵ain銆傚洜涓哄湪緇撴潫鐨勬椂鍊欏彲浠ヨ繑鍥炵粰鎿嶄綔緋葷粺涓涓間互琛ㄧず鎵ц鎯呭喌銆?nbsp;
int argc
榪欎釜涓滀笢鐢ㄦ潵琛ㄧず浣犲湪鍛戒護(hù)琛屼笅杈撳叆鍛戒護(hù)鐨勬椂鍊欙紝涓鍏辨湁澶氬皯涓弬鏁般傛瘮鏂硅浣犵殑紼嬪簭緙栬瘧鍚庯紝鍙墽琛屾枃浠舵槸test.exe
D:\tc2>test
榪欎釜鏃跺欙紝argc鐨勫兼槸1
浣嗘槸
D:\tc2>test.exe myarg1 myarg2 鐨勮瘽錛宎rgc鐨勫兼槸3銆備篃灝辨槸鍛戒護(hù)鍚嶅姞涓婁袱涓弬鏁幫紝涓鍏變笁涓弬鏁?nbsp;
char *argv[]
榪欎釜涓滀笢鐢ㄦ潵鍙栧緱浣犳墍杈撳叆鐨勫弬鏁?nbsp;
D:\tc2>test
榪欎釜鏃跺欙紝argc鐨勫兼槸1錛宎rgv[0]鐨勫兼槸 "test"
D:\tc2>test myarg1 myarg2
榪欎釜鏃跺欙紝argc鐨勫兼槸3錛宎rgc[0]鐨勫兼槸"test"錛宎rgc[1]鐨勫兼槸"myarg1"錛宎rgc[2]鐨勫兼槸"myarg2"銆?nbsp;
榪欎釜涓滀笢涓鑸敤鏉ヤ負(fù)紼嬪簭鎻愪緵闈炲父閲嶈鐨勪俊鎭紝濡傦細(xì)鏁版嵁鏂囦歡鍚嶏紝絳夌瓑銆?nbsp;
濡傦細(xì)copy a.c b.txt
榪欎釜鏃跺欙紝a.c鍜宐.txt灝辨槸鎵璋撶殑“闈炲父閲嶈鐨勪俊鎭?#8221;銆備笉鎸囧畾榪欎袱涓枃浠訛紝浣犳病娉曡繘琛屾嫹璐濄?nbsp;
褰撲綘鐨勭▼搴忕敤鍒癮rgc鍜宎rgv榪欎袱涓弬鏁扮殑鏃跺欙紝鍙互綆鍗曞湴閫氳繃鍒ゆ柇argc鐨勫鹼紝鏉ョ湅鐪嬬▼搴忕殑鍙傛暟鏄惁絎﹀悎瑕佹眰
char *envp[]
榪欎釜涓滀笢鐩稿鏉ヨ鐢ㄥ緱姣旇緝?yōu)畱銆傚畠鏄敤鏉ュ彇寰楃郴緇熺殑鐜鍙橀噺鐨勩?nbsp;
濡傦細(xì)鍦―OS涓嬶紝鏈変竴涓狿ATH鍙橀噺銆傚綋浣犲湪DOS鎻愮ず絎︿笅杈撳叆涓涓懡浠わ紙褰撶劧錛岃繖涓懡浠や笉鏄痙ir涓綾葷殑鍐呴儴鍛戒護(hù)錛夌殑鏃跺欙紝DOS浼?xì)棣栧厛鍦ㄥ綋鍓嶇洰褰曚笅鎵緲q欎釜鍛戒護(hù)鐨勬墽琛屾枃浠躲傚鏋滄壘涓嶅埌錛屽垯鍒癙ATH瀹氫箟鐨勮礬寰勪笅鍘繪壘錛屾壘鍒板垯鎵ц錛屾壘涓嶅埌榪斿洖Bad command or file name
鍦―OS鍛戒護(hù)鎻愮ず絎︿笅閿叆set鍙煡鐪嬬郴緇熺殑鐜鍙橀噺
鍚屾牱錛屽湪UNIX鎴栬匧INUX涓嬶紝涔熸湁緋葷粺鐜鍙橀噺錛岃屼笖鐢ㄥ緱姣擠OS瑕佸銆傚甯哥敤鐨?PATH,$USER,$HOME絳夌瓑銆?nbsp;
envp淇濆瓨鎵鏈夌殑鐜鍙橀噺銆傚叾鏍煎紡涓猴紙UNIX涓嬶級(jí)
PATH=/usr/bin;/local/bin;
HOME=/home/shuui
鍗籌細(xì)
鐜鍙橀噺鍚?鍊?nbsp;
DOS涓嬪ぇ姒備篃涓鏍楓?nbsp;
鐜鍙橀噺涓鑸敤鏉ヤ負(fù)紼嬪簭鎻愪緵闄勫姞淇℃伅銆傚錛屼綘鍋氫簡(jiǎn)涓涓樉紺烘枃鏈殑鍐呭鐨勭▼搴忋備綘鎯蟲帶鍒跺叾涓琛屼腑鏄劇ず鐨勫瓧絎︾殑涓暟銆備綘鍙互鑷繁瀹氫箟涓涓幆澧冨彉閲忥紙UNIX涓嬶級(jí)
%setenv NUMBER = 10
%echo $NUMBER
10
鐒跺悗浣犲彲浠ュ湪紼嬪簭涓鍏ヨ繖涓幆澧冨彉閲忋傜劧鍚庢牴鎹叾鍊煎喅瀹氫竴琛岃緭鍑哄灝戜釜瀛楃銆傝繖鏍鳳紝濡傛灉浣犱笉淇敼鐜鍙橀噺鐨勮瘽錛屼綘姣忔鎵ц榪欎釜紼嬪簭錛屼竴琛屼腑鏄劇ず鐨勫瓧絎︽暟閮芥槸涓嶄竴鏍風(fēng)殑
涓嬮潰鏄竴涓緥瀛愮▼搴?nbsp;
/* argtest.c */
#include<stdio.h>
int main( int argc , char *argv[] , char *envp[] )
{
int i;
printf( "You have inputed total %d argments\n" , argc );
for( i=0 ; i<argc ; i++)
{
printf( "arg%d : %s\n" , i , argv[i] );
}
printf( "The follow is envp :\n" );
for( i=0 ; *envp[i]!='\0' ; i++ )
{
printf( "%s\n" , envp[i] );
}
return 0;
}
D:\>argtest this is a test programe of main()'s argments
You have inputed total 9 argments
arg0 : D:\TC\NONAME.EXE
arg1 : this
arg2 : is
arg3 : a
arg4 : test
arg5 : programe
arg6 : of
arg7 : main()'s
arg8 : argments
The follow is envp :
TMP=C:\WINDOWS\TEMP
TEMP=C:\WINDOWS\TEMP
PROMPT=$p$g
winbootdir=C:\WINDOWS
PATH=C:\WINDOWS;C:\WINDOWS\COMMAND
COMSPEC=C:\WINDOWS\COMMAND.COM
SBPCI=C:\SBPCI
windir=C:\WINDOWS
BLASTER=A220 I7 D1 H7 P330 T6
CMDLINE=noname this is a test programe of main()'s argments
-----------------------------------------------------------------------------------------
鍛戒護(hù)琛屽弬鏁板晩 argc 鏄弬鏁扮殑涓暟錛宎rgv[]鏄弬鏁幫紝argv[0]鏄枃浠跺悕錛宎rgv[1]鏄涓涓弬鏁?..
濡備綘寰梕xe鏂囦歡鍚嶆槸:myprog.exe錛岄偅涔?nbsp;
myprog 12 22 32
鍒檃rgv[0]="myprog"錛宎rgv[1]="12"錛宎rgv[2]="22"...
]]>
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