#include <stdio.h>
#include <windows.h>
const char * FileName = "reg.txt"; 
const char * trueCode = "1245";
#define Msg(STR)( MessageBoxA(NULL,STR,NULL,MB_OK))
int _stdcall  RegGo()
{
	char FileBuf[8];
	char cNow;
	int nIndex = 0;
	FILE *fp;
	memset(FileBuf,0,sizeof(FileBuf));
	fp=fopen(FileName,"r");
	if(fp==NULL)
	{
		Msg("导入注册文件失败\n");
		ExitProcess(-1);
	}
	fscanf(fp,"%s",FileBuf);
	if(!strcmp(trueCode,FileBuf))
	{
		Msg("你的注册文件输入正确！ 恭喜");
		return 0;
	}
	Msg("你的注册文件好像有些问题！");
	return 0;
}

int _stdcall WinMain(
    HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow
)
{
	RegGo();
	MessageBoxA(NULL,"Hello world!\n",NULL,MB_OK);
}

0012FEFC    33DB            xor ebx,ebx
0012FEFE    53              push ebx
0012FEFF    68 656C6C6F     push 0x6F6C6C65
0012FF04    4C              dec esp
0012FF05    C60424 68       mov byte ptr ss:[esp],0x68

0012FF09    8BC4            mov eax,esp
0012FF0B    53              push ebx
0012FF0C    53              push ebx
0012FF0D    50              push eax
0012FF0E    53              push ebx
0012FF0F    B8 11EA4077     mov eax,user32.MessageBoxA
0012FF14    FFD0            call eax

0012FF16    B8 7E42FA75     mov eax,KernelBa.ExitProcess
0012FF1B    53              push ebx
0012FF1C    FFD0            call eax

[培训]内核驱动高级班，冲击BAT一流互联网大厂工作，每周日13:00-18:00直播授课