http://qwop.iteye.com/blog/1958761
// lodsb.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <string.h>
/************************************************************************/
/* 载入串指令
/* LODS LODSB LODSW LODSD 例子
/* 运行结果:
/* bcdef
/* g1
/* 2345
/************************************************************************/
int main(int argc, char* argv[])
{
char s[33] = "abcdefg123456789";
char lodsb_chars[ 10 ] = {0};
char ret[ 10 ] = {0};
short vWORD = 0; // 备用载入 字 数据
int vDWORD = 0; // 备用载入 双字 数据
__asm {
xor eax,eax // 清空eax
lea esi, s // esi 指向数据 s
mov ecx, 2 // 执行两次 lodsb
// 载入串指令: LODSB、LODSW、LODSD ;将 ESI 指向的数据载入到 AL/AX/EAX, 执行后 ESI 自动变化
rep lodsb // mov al byte ptr [esi]; esi = esi + sizeof( byte );
// 数据载入到al中
mov lodsb_chars[ 0 ], al // b
lodsb
mov lodsb_chars[ 1 ], al // c
lodsb
mov lodsb_chars[ 2 ], al // d
lodsb
mov lodsb_chars[ 3 ], al // e
lodsb
mov lodsb_chars[ 4 ], al // f
lodsw // 载入串 字 指令
mov vWORD,ax // g1
lodsd // 载入串 双字 指令
mov vDWORD,eax // 2345
}
printf( "%s\r\n", lodsb_chars );
strncpy( ret, (char*) &vWORD, 2 ); // 将字符串 ps 中 2 个字符复制到字符串 ret 中。
printf( "%s\r\n", ret );
strncpy( ret, ( char* ) &vDWORD, 4 ); // 将字符串 ps 中 4 个字符复制到字符串 ret 中。
printf( "%s\r\n", ret );
getchar();
return 0;
}
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