Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

C/C++——С±à̸CÓïÑÔº¯ÊýÄÇЩÊÂ(13)

C³ÌÐòÊÇÓÉÒ»×é»òÊDZäÁ¿»òÊǺ¯ÊýµÄÍⲿ¶ÔÏó×é³ÉµÄ¡£ º¯ÊýÊÇÒ»¸ö×ÔÎÒ°üº¬µÄÍê³ÉÒ»¶¨Ïà¹Ø¹¦ÄܵÄÖ´ÐдúÂë¶Î¡£ÏÂÃæÐ¡±àºÍ´ó¼Ò·ÖÏíÏÂCÓïÑÔÖеĺ¯Êý¡£
1.       mallocº¯Êý
mallocº¯ÊýµÄ¹¦ÄÜÊÇÄÚ´æ·ÖÅ亯Êý£¬ÆäÓ÷¨Îª£ºvoid *malloc(unsigned size);³ÌÐòʵÀýÈçÏ£º
#include <stdio.h>
#include <string.h>
#include <alloc.h>
#include <process.h>
int main(void)
{
   char *str;
      if ((str = malloc(10)) == NULL)
   {
      printf("Not enough memory to allocate buffer\n");
      exit(1);  /* terminate program if out of memory */
   }
    strcpy(str, "Hello");
    printf("String is %s\n", str);
    free(str);
    return 0;
}
 
2.      memchrº¯Êý
memchrº¯ÊýµÄ¹¦ÄÜÊÇÔÚÊý×éµÄǰn¸ö×Ö½ÚÖÐËÑË÷×Ö·û£¬ÆäÓ÷¨Îª£ºvoid *memchr(void *s, char ch, unsigned n);  ³ÌÐòʵÀý´úÂëÈçÏ£º
#include <string.h>
#include <stdio.h>
int main(void)
{
   char str[17];
   char *ptr;
   strcpy(str, "This is a string");
   ptr = memchr(str, 'r', strlen(str));
   if (ptr)
      printf("The character 'r' is at position: %d\n", ptr - str);
   else
      printf("The character was not found\n");
   return 0;
}
3.      memicmpº¯Êý
memicmpº¯ÊýµÄ¹¦ÄÜÊDZȽÏÁ½¸ö´®s1ºÍs2µÄǰn¸ö×Ö½Ú, ºöÂÔ´óСд£¬ÆäÓ÷¨Îª£ºint memicmp(void *s1, void *s2, unsigned n);³ÌÐòʵÀý´úÂëÈçÏ£º
#include <stdio.h>
#include <string.h>
int main(void)
{
   char *buf1 = "ABCDE123";
   char *buf2 = "abcde456";
   int stat;
   stat = memicmp(buf1, buf2, 5);
   printf("The strings to position 5 are ");
   if (stat)
   printf("not ");
 &


Ïà¹ØÎĵµ£º

ʹÓÃEclipse+MinGW¹¹½¨WindowsÉϵÄC/C++¿ª·¢»·¾³

ǰÑÔ
Eclipse×÷Ϊһ¿î¼«ÆäÓÅÐãµÄJava IDE£¬ÒѾ­µÃµ½¹ã·ºµÄÈϿɡ£µ±È»Eclipse²¢²»ÏÞÓÚJava¿ª·¢£¬ÓÉÓÚÆäÓÅÐãµÄ»ù´¡¼Ü¹¹£¬EclipseÒѾ­³ÉΪһ¸ö¿ÉÒÔÈÝÄÉÒ»ÇÐÓ뿪·¢ÓйصŤ¾ßµÄƽ̨¡£
µ±È»ÈÝÄÉÒ»Çв¢²»Òâζ×ÅÊʺÏÓÚÒ»ÇС£ÏñC/C++ÕâÑùÔç¾Í´æÔڵIJ¢¹ã·ºÓ¦ÓõÄÓïÑÔ£¬Ôç¾ÍÓÐÒ»´óÅú¿ÉÓõÄIDE£¬Ò²ÓкܶàÈËϲ»¶ÓÃvi/emacs×÷Ϊ×Ô¼ºµÄ¿ ......

VC .NETÖÐString^ ÓëANSI C char*»¥×ª

VC.NETÖеÄStringÀàÊÇÀûÓÃUnicode×Ö·û¼¯±àÂëÀ´±íʾÎı¾¡£Unicode×Ö·û¼¯ÖÐÿ¸ö×Ö·û(ºº×Ö¡¢Ó¢ÎÄ×Öĸ)¶¼Õ¼2¸ö×Ö½Ú£¬ÇÒÆä×Ö·û´®ÊÇÒÔ2¸öÁ¬ÐøµÄ\0½áβµÄ¡£
ANSIµÄASCII×Ö·û¼¯ÊÇ×î³£¼ûµÄ×Ö·û¼¯£¬³£ÓÃÓÚ±íʾtxtµÄÎı¾Îļþ¡£ÔÚASCII×Ö·û¼¯ÖÐÓ¢ÎÄÕ¼Ò»¸ö×Ö½Ú£¬ºº×Ö2¸ö×Ö½Ú£¬ÇÒÆä×Ö·û´®ÊÇÒÔÒ»¸ö\0½áβµÄ¡£
ÔÚÀûÓÃVC.NET½øÐлìºÏ±à³Ìʱ ......

CºÍC++»ìºÏ±à³Ì(__cplusplusʹÓÃ)


µÚÒ»ÖÖÀí½â
±ÈÈç˵ÄãÓÃC++¿ª·¢ÁËÒ»¸öDLL¿â£¬ÎªÁËÄܹ»ÈÃCÓïÑÔÒ²Äܹ»µ÷ÓÃÄãµÄDLLÊä³ö(Export)µÄº¯Êý£¬ÄãÐèÒªÓÃextern "C"À´Ç¿ÖƱàÒëÆ÷²»ÒªÐÞ¸ÄÄãµÄ
º¯ÊýÃû¡£
ͨ³££¬ÔÚCÓïÑÔµÄÍ·ÎļþÖо­³£¿ÉÒÔ¿´µ½ÀàËÆÏÂÃæÕâÖÖÐÎʽµÄ´úÂ룺
#ifdef __cplusplus
extern "C" {
#endif
/**** some declaration or so *****/
#ifde ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ