C/C++ ϱêÓÐЧÐÔ¼ì²é
C/C++ÊDz»¼ì²éÊý×éϱêÊÇ·ñÔ½½çµÄ¡£
²»¼ì²éϱêÊÇ·ñÔ½½ç¿ÉÒÔÓÐЧÌá¸ß³ÌÐòÔËÐеÄЧÂÊ£¬ÒòΪÈç¹ûÄã¼ì²é£¬ÄÇô±àÒëÆ÷±ØÐëÔÚÉú³ÉµÄÄ¿±ê´úÂëÖмÓÈë¶îÍâµÄ´úÂëÓÃÓÚ³ÌÐòÔËÐÐʱ¼ì²âϱêÊÇ·ñÔ½½ç£¬Õâ¾Í»áµ¼Ö³ÌÐòµÄÔËÐÐËÙ¶ÈϽµ£¬ËùÒÔΪÁ˳ÌÐòµÄÔËÐÐЧÂÊ£¬C/C++²Å²»¼ì²éϱêÊÇ·ñÔ½½ç¡£
C/C++Èç¹ûÊý×éϱêÔ½½çÁË£¬ÄÇôËü»á×Ô¶¯½Ó×ÅÄÇ¿éÄÚ´æÍùºóд¡£ÏëÁËÒ»ÏÂÃ÷°×ÁË£¬ÒÔǰ˵²»ÔÊÐíÊý×éϱêÔ½½ç£¬²¢²»ÊÇÒòΪ½çÍâûÓд洢¿Õ¼ä£¬¶øÊÇÒòΪ½çÍâµÄÄÚÈÝÊÇδ֪µÄ¡£Ò²¾ÍÊÇ˵Èç¹û½çÍâµÄ¿Õ¼äÔÝʱûÓб»ÀûÓã¬ÄÇôÎÒÃÇ¿ÉÒÔÕ¼ÓÃÄÇ¿éÄڴ棬µ«ÊÇÈç¹û֮ǰ½çÍâµÄÄÚ´æÒѾ´æ·ÅÁ˶«Î÷£¬ÄÇôÎÒÃÇÔ½½ç¹ýÈ¥¾Í»á¸²¸ÇÄÇ¿éÄڴ棬µ¼Ö´íÎóµÄ²úÉú¡£¡£¡£
Ïà¹ØÎĵµ£º
×î½üµÄÒ»¸öÏîÄ¿ÔÚʹÓÃC3P0µÄÁ¬½Ó³Ø£¬Êý¾Ý¿âΪMysql¡£¿ª·¢²âÊÔûÓÐÎÊÌ⣬ÔÚÔËÐÐÖÐÿ¸öÒ»¶Î³¤µÄ¿ÕÏÐʱ¼ä¾Í³öÏÖÒì³£Communications link failure due to underlying exception:
java ´úÂë
²é¿´ÁËMysqlµÄÎĵµ£¬ÒÔ¼°Connector/JµÄÎĵµÒÔ¼°ÔÚÏß˵Ã÷·¢ÏÖ£¬³öÏÖÕâÖÖÒì³£µÄÔÒòÊÇ£º
Mysql·þÎñÆ÷ĬÈϵēwait_timeout&rdquo ......
Ò»¡¢ÇëÌîдBOOL , float, Ö¸Õë±äÁ¿ Óë“ÁãÖµ”±È½ÏµÄ if Óï¾ä¡££¨10·Ö£©
Ìáʾ£ºÕâÀï“ÁãÖµ”¿ÉÒÔÊÇ0, 0.0 , FALSE»òÕß“¿ÕÖ¸Õ딡£ÀýÈç int ±äÁ¿ n
Óë“ÁãÖµ”±È½ÏµÄ if Óï¾äΪ£º
if ( n == 0 )
if ( n != 0 )
ÒÔ´ËÀàÍÆ¡£
Çëд³ö BOOL flag Óë“ÁãÖµ”±È½ÏµÄ if ......
Ò»¡¢¼ò½é
µ÷ÊÔÆ÷(±ÈÈçÏóGDB)ÄÜÈÃÄã¹Û²ìÁíÒ»¸ö³ÌÐòÔÚÖ´ÐÐʱµÄÄÚ²¿»î¶¯£¬»ò³ÌÐò³ö´íʱ·¢ÉúÁËʲô¡£GDBÖ÷ÒªÄÜΪÄã×öËļþÊÂ(°üÀ¨ÎªÁËÍê³ÉÕâЩʶø¸½¼ÓµÄ¹¦ÄÜ)£¬°ïÖúÄãÕÒ³ö³ÌÐòÖеĴíÎó¡£
* ÔËÐÐÄãµÄ³ÌÐò£¬ÉèÖÃËùÓеÄÄÜÓ°Ïì³ÌÐòÔËÐеĶ«Î÷¡ ......
1. memcpyº¯ÊýµÄʵÏÖ
Ê×ÏȶÔÕâ¸öº¯Êý×öһЩ˵Ã÷¡£
#include <string.h>
void *memcpy(void *to, const void *from, size_t count)
º¯Êýmemcpy()´ÓfromÖ¸ÏòµÄÊý×éÏòtoÖ¸ÏòµÄÊý×鸴ÖÆcount¸ö×Ö·û¡£Èç¹ûÁ½Êý×éÖصþ£¬²»¶¨Ò庯ÊýµÄÐÐΪ¡£
ÔÚC99ÖУ¬toºÍfromÓÉrestrictÐÞÊΡ£
ÏÈÀ´¿´¿´Î¢ÈíµÄʵÏÖ£º
void * __cdecl m ......