Windows系统调用详解：__stdcall与__cdecl的区别与函数实现

windows系统调用函数的方法有3种:__stdcall , __cdecl ,PASCAL
前两种是从右向左传递参数,最后一种是从左向右传递参数.    
    
__stdcall是windows系统调用API的标准方式 
__cdecl是ANSI-C的标准调用方式 
  

    __stdcall和__cdecl是有一些区别的:

    1.__stdcall是由被调用函数恢复ebp和esp指针,在这个例子中是 f_stcall()

    2.__cdecl是由调用函数恢复ebp和esp指针,在这个例子中是 f_cdecl()

   ======================================================
 #include "stdio.h"

 void __stdcall f_stdcall(int a,int b)
 {
int c;
c=a+b;
 }

 void  f_cdeclr(int a, int b)
 {
int c;
c=a+b;
 }

 main()
 {

int left =1,right =2;
f_stdcall(left,right);
f_cdeclr(left,right);
printf("%d,%d",1,2);
 }
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1:    #include "stdio.h"
2:
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                f_stdcall()函数的反汇编
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3:    void __stdcall f_stdcall(int a,int b)
4:    {
004012F0   push        ebp //保存父函数的基址main.ebp
004012F1   mov         ebp,esp //开辟运行栈 f_stdcall.ebp
004012F3   sub         esp,44h //40h保留,int c 有4h
004012F6   push        ebx      //初始化44h空间,循环11次
004012F7   push        esi
004012F8   push        edi
004012F9   lea         edi,[ebp-44h]
004012FC   mov         ecx,11h
00401301   mov         eax,0CCCCCCCCh
00401306   rep stos    dword ptr [edi]
5:        int c;
6:        c=a+b;
00401308   mov         eax,dword ptr [ebp+8]  //取得参数a,                                       //+8的原因在上面说过
0040130B   add         eax,dword ptr [ebp+0Ch] //取得参数b
0040130E   mov         dword ptr [ebp-4],eax//保存在c