´Óº¯Êý·µ»ØÒ»¸öÊý×éµÄ2ÖÖ·½·¨ (Cר¼Ò±à³Ì p230)
ÑϸñÀ´Ëµ£¬ÎÞ·¨´Óº¯Êý·µ»ØÒ»¸öÊý×飬µ«¿ÉÒÔ´Óº¯Êý·µ»ØÒ»¸öÖ¸ÏòÈκÎÊý¾Ý½á¹¹µÄÖ¸Õ룬°üÀ¨Ò»¸öÖ¸ÏòÊý×éµÄÖ¸Õë¡£
Ò»ÖÖ·½Ê½ÈçÏ£º
#include <stdio.h>
#include <stdlib.h>
int (*func())[20];//funcÊÇÒ»¸öº¯Êý£¬Ëü·µ»ØÒ»¸öÖ¸Ïò°üÀ¨20¸öintÔªËصÄÊý×éµÄÖ¸Õë
int main(void)
{
int (*result)[20];
int i = 0;
result = func();
for(i = 0; i < 20; i++){
printf("%d\n", (*result)[i]);
}
free(result);
exit(0);
}
int (*func())[20]
{
int (*a)[20];
int i = 0;
a = calloc(20, sizeof(int));
if(a == NULL){
perror("calloc error");
exit(1);
}
for(i = 0; i < 20; i++){
a[0][i] = i;
}
return a;
}
ǧÍòҪעÒ⣺²»ÄÜ´Óº¯ÊýÖзµ»ØÒ»¸öÖ¸Ïòº¯ÊýµÄ¾Ö²¿±äÁ¿µÄÖ¸Õë¡£
ÁíÒ»ÖÖ·½Ê½ÈçÏ£º
#include <stdio.h>
#include <stdlib.h>
struct tag{
int array[20];
}x, y;
struct tag func(void);
int main(void)
{
&n
Ïà¹ØÎĵµ£º
CreateThreadº¯Êý
Ç°Ãæ½²¹ý£¬½ø³ÌµÄÖ÷Ï̻߳áÔÚCreateProcessµ÷ÓÃʱ×Ô¶¯´´½¨¡£¼ÙÈçÄãÒªÊÖ¹¤´´½¨Ị̈߳¬Äã¿ÉÒÔµ÷ÓÃCreateThreadº¯Êý£º
HANDLE CreateThread(
PSECURITY_ATTRIBUTES psa,
DWORD cbStackSize,
PTHREAD_START_ROUTINE pfnStartAddr,
PVOID pvParam,
DWORD dwCreateFlags,
PDWORD pdwThreadID) ......
¡¾³ÌÐò1¡¿
ÌâÄ¿£ºÓÐ1¡¢2¡¢3¡¢4¸öÊý×Ö£¬ÄÜ×é³É¶àÉÙ¸ö»¥²»ÏàͬÇÒÎÞÖظ´Êý×ÖµÄÈýλÊý£¿¶¼ÊǶàÉÙ
£¿
1.³ÌÐò·ÖÎö£º¿ÉÌîÔÚ°Ùλ¡¢Ê®Î»¡¢¸öλµÄÊý×Ö¶¼ÊÇ1¡¢2¡¢3¡¢4¡£×é³ÉËùÓеÄÅÅÁкóÔÙÈ¥
¡¡¡¡¡¡¡¡¡¡¡¡µô²»Âú×ãÌõ¼þµÄÅÅÁС£
2.³ÌÐòÔ´´úÂ룺
main()
{
int i,j,k;
printf("\n");
for(i=1;i<5;i++)¡¡¡¡¡¡¡¡£¯*ÒÔÏ ......
Ò»£¬²»Í¬¹Ø¼ü×Ö£¬ÏµÍ³Ñ¹Õ»·½Ê½
1£¬Èç¹ûº¯ÊýfuncÊÇ__cdecl(VCϵÄĬÈϵ÷Ó÷½Ê½)£¬µ÷ÓÃʱÇé¿öÈçÏÂ
int main()
{
//²ÎÊý´ÓÓÒµ½×óѹջ
push 4
push 3
push 2
push 1
call func
add esp 0x10 //µ÷ÓÃÕ߻ָ´¶ÑÕ»Ö¸Õëesp£¬4¸ö²ÎÊýµÄ´óСÊÇ0x10(4x4)
}
Cµ÷ÓÃÔ¼¶¨£¨¼´ÓÃ__cdecl¹Ø¼ü×Ö˵Ã÷£©°´´ÓÓÒÖÁ×óµÄ˳Ðòѹ² ......
¾Ù¸ö¼òµ¥Àý×Ó£ºÓöþÖØÑ»·Êä³ö1-100 Êý×Ö£»
µ±È»ÎÒÕâÀïÊǾÙÀý×ÓÕë¶Ô¶þÖؼ°ÒÔÉϵÄÑ»·£¬
ÍêÈ«¿ÉÒÔʹÓõ¥Ñ»·£¬ÓÚÊDZã·É¿ìµÄÍê³ÉÁËÒÔÏÂ
´úÂ룺
ÈçϾÍÓÃC/C++¾ÙÀý¡£
C++´úÂë(VS2008):
#include "stdafx.h"
#include <iostream>
using namespace std;
int _tmain(in ......
#include <stdio.h>
struct Foo1
{
char a;
int b;
char c;
int d;
};
#pragma pack (2)
struct Foo2
{
char a;
int b;
char c;
int d; ......