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#2
zklhp2014-06-12 20:03
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程序代码：#ifndef STOCK00_H_
#define STOCK00_H_
class Cstock{
private:
int a,b;
public:
void function1(int num1,int num2);
int function2();
};
#endif
类的实现
程序代码：#include "StdAfx.h"
#include "Cstock.h"
void Cstock::function1(int num1,int num2)
{
a=num1;
b=num2;
}
int Cstock::function2()
{
return a+b;
}
主程序
#include "stdafx.h"
#include "Cstock.h"
#include <stdio.h>
#include <stdlib.h>
int _tmain(int argc, _TCHAR* argv[])
{
Cstock stock1;
int num;
stock1.function1(3,4);
num=stock1.function2();
printf("%d\n",num);
getchar();
}
#include "Cstock.h"
#include <stdio.h>
#include <stdlib.h>
int _tmain(int argc, _TCHAR* argv[])
{
Cstock stock1;
int num;
stock1.function1(3,4);
num=stock1.function2();
printf("%d\n",num);
getchar();
}
主程序反编译
程序代码：.text:00411460 wmain proc near ; CODE XREF: j_wmainj
.text:00411460
.text:00411460 var_DC = byte ptr -0DCh
.text:00411460 var_18 = dword ptr -18h
.text:00411460 var_C = byte ptr -0Ch
.text:00411460
.text:00411460 push ebp
.text:00411461 mov ebp, esp
.text:00411463 sub esp, 0DCh
.text:00411469 push ebx
.text:0041146A push esi
.text:0041146B push edi
.text:0041146C lea edi, [ebp+var_DC]
.text:00411472 mov ecx, 37h
.text:00411477 mov eax, 0CCCCCCCCh
.text:0041147C rep stosd
.text:0041147E push 4
.text:00411480 push 3
.text:00411482 lea ecx, [ebp+var_C] --------------------〉这句值得注意
.text:00411485 call j_Cstock__function1 调用函数 function1
.text:0041148A lea ecx, [ebp+var_C]
.text:0041148D call j_Cstock__function2
.text:00411492 mov [ebp+var_18], eax
.text:00411495 mov esi, esp
.text:00411497 mov eax, [ebp+var_18]
.text:0041149A push eax
.text:0041149B push offset Format ; "%d\n"
.text:004114A0 call ds:__imp__printf
.text:004114A6 add esp, 8
.text:004114A9 cmp esi, esp
.text:004114AB call j__RTC_CheckEsp
.text:004114B0 mov esi, esp
.text:004114B2 call ds:__imp__getchar
.text:004114B8 cmp esi, esp
.text:004114BA call j__RTC_CheckEsp
.text:004114BF xor eax, eax
.text:004114C1 push edx
.text:004114C2 mov ecx, ebp
.text:004114C4 push eax
.text:004114C5 lea edx, dword_4114E8
.text:004114CB call j__RTC_CheckStackVars
.text:004114D0 pop eax
.text:004114D1 pop edx
.text:004114D2 pop edi
.text:004114D3 pop esi
.text:004114D4 pop ebx
.text:004114D5 add esp, 0DCh
.text:004114DB cmp ebp, esp
.text:004114DD call j__RTC_CheckEsp
.text:004114E2 mov esp, ebp
.text:004114E4 pop ebp
.text:004114E5 retn
.text:004114E5 wmain endp
Function1 反编译
程序代码：.text:004113C0 Cstock__function1 proc near ; CODE XREF: j_Cstock__function1j
.text:004113C0
.text:004113C0 var_CC = byte ptr -0CCh
.text:004113C0 var_8 = dword ptr -8
.text:004113C0 arg_0 = dword ptr 8
.text:004113C0 arg_4 = dword ptr 0Ch
.text:004113C0
.text:004113C0 push ebp
.text:004113C1 mov ebp, esp
.text:004113C3 sub esp, 0CCh
.text:004113C9 push ebx
.text:004113CA push esi
.text:004113CB push edi
.text:004113CC push ecx
.text:004113CD lea edi, [ebp+var_CC]
.text:004113D3 mov ecx, 33h
.text:004113D8 mov eax, 0CCCCCCCCh
.text:004113DD rep stosd
.text:004113DF pop ecx --------------------------〉这句对应于主函数 lea ecx, [ebp+var_C] ecx指向主函数的栈底往后数C的地址上
.text:004113E0 mov [ebp+var_8], ecx ---------〉将这个地址存放到本函数栈内
.text:004113E3 mov eax, [ebp+var_8] ---------->将这个值给eax
.text:004113E6 mov ecx, [ebp+arg_0] -----------〉ecx =3
.text:004113E9 mov [eax], ecx ----------->这句将3的值存放到 eax指向的内存中去 而eax的值是指向主函数的栈ebp-12的地方
.text:004113EB mov eax, [ebp+var_8]
.text:004113EE mov ecx, [ebp+arg_4]
.text:004113F1 mov [eax+4], ecx ------------〉这个地方是将4的值存放到主函数的栈ebp-8的地方
.text:004113F4 pop edi
.text:004113F5 pop esi
.text:004113F6 pop ebx
.text:004113F7 mov esp, ebp
.text:004113F9 pop ebp
.text:004113FA retn 8
.text:004113FA Cstock__function1 endp
Function2 反编译
程序代码：.text:00411410 Cstock__function2 proc near ; CODE XREF: j_Cstock__function2j
.text:00411410
.text:00411410 var_CC = byte ptr -0CCh
.text:00411410 var_8 = dword ptr -8
.text:00411410
.text:00411410 push ebp
.text:00411411 mov ebp, esp
.text:00411413 sub esp, 0CCh
.text:00411419 push ebx
.text:0041141A push esi
.text:0041141B push edi
.text:0041141C push ecx
.text:0041141D lea edi, [ebp+var_CC]
.text:00411423 mov ecx, 33h
.text:00411428 mov eax, 0CCCCCCCCh
.text:0041142D rep stosd
.text:0041142F pop ecx -------------------〉这句对应于主函数 lea ecx, [ebp+var_C]
.text:00411430 mov [ebp+var_8], ecx
.text:00411433 mov eax, [ebp+var_8] 让eax指向主函数栈 ebp-12的地方
.text:00411436 mov eax, [eax] 取主函数栈ebp-12存放的值
.text:00411438 mov ecx, [ebp+var_8] 给让ecx也指向驻函数ebp-12的地方
.text:0041143B add eax, [ecx+4] ---------------------------〉return a+b
.text:0041143E pop edi
.text:0041143F pop esi
.text:00411440 pop ebx
.text:00411441 mov esp, ebp
.text:00411443 pop ebp
.text:00411444 retn
.text:00411444 Cstock__function2 endp
结论
1. 类的私有变量 定义类的实例 在哪个函数里，那么类的私有变量就在哪个函数的栈里面
2. 类的方法调用，和普通的函数调用是没多大区别的
3。类的私有变量不能被外部程序访问，并不是指可执行程序的场景，而是指编译器在编译的过程中不允许发生这样的事情
[ 本帖最后由 zhu224039 于 2014-6-12 18:21 编辑 ]
