怎样修改程序入口地址

1、extern "C" int __cdecl mainCRTStartup(void); //注意：若源文件是.c结尾的话，不需要这一句

2、 __asm { MOV EAX, OFFSET main MOV BYTE PTR[EAX], 0xB8 //MOV EAX, 0x //mov MOV DWORD PTR[EAX+1], OFFSET SHOWSTRING //将printf语句地址放在eax+1处 MOV WORD PTR[EAX+5], 0xE0FF // JMP EAX:FFE0 }

3、#include "stdio.h"extern &孥恶膈茯quot;C" int __cdecl mainC伊怕锱鳏RTStartup(void); //注意：若源文件是.c结尾的话，不需要这一句void print(){ #pragma comment(linker, "/entry:print") #pragma comment(linker, "/SECTION:.text,ERW") #pragma comment(lib, "msvcrt.lib") int mainCRTStartup(); void main(); __asm { MOV EAX, OFFSET main MOV BYTE PTR[EAX], 0xB8 //MOV EAX, 0x //mov MOV DWORD PTR[EAX+1], OFFSET SHOWSTRING //将printf语句地址放在eax+1处 MOV WORD PTR[EAX+5], 0xE0FF // JMP EAX:FFE0 } mainCRTStartup();// __asm// {// leave// ret// }SHOWSTRING: printf("hello,world!\n"); __asm { xor eax,eax ret }}void main(){}