Read MBR via ReadFile function

// ReadMBR.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
const UINT uSectorSize=512; //扇区大小(byte)
const UINT uBegSector=0;//扇区编号
const UINT uSectorNum=1;//扇区数量
const UINT uReadSize=uSectorNum*uSectorSize;//读取数据大小
BYTE bBuffer[uReadSize]={0};
BYTE rBuffer[uReadSize]={0};
const char drive[]="\\\\.\\PHYSICALDRIVE0";

void ShowByteInform(PBYTE,UINT);
int main(int argc, char* argv[])
{
    WNDCLASS wc;

    HANDLE hDeviceHandle;
    HICON mIcon;
    mIcon=LoadIcon(NULL,IDI_WARNING);
        wc.hIcon=mIcon;
    hDeviceHandle=CreateFile(drive,GENERIC_WRITE|GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_EXISTING,0,0);
    if(hDeviceHandle==INVALID_HANDLE_VALUE)
    {
        printf("open disk error!!\n");
        return 0;
    }
    
    SetFilePointer(hDeviceHandle,uBegSector*uSectorSize,0,FILE_BEGIN);
    DWORD dwReadByte;
    if(ReadFile(hDeviceHandle,(LPVOID)bBuffer,uReadSize,&dwReadByte,NULL)==0)
    {
        printf("Read Error!\n");
        DWORD dw=GetLastError();
    }//读入bBuffer
    else
        bBuffer[446]==0x80?bBuffer[446]=0x00:bBuffer[446]=0x80;
    SetFilePointer(hDeviceHandle,uBegSector*uSectorSize,0,FILE_BEGIN);
    if(WriteFile(hDeviceHandle,(LPVOID)bBuffer,uReadSize,&dwReadByte,NULL))
    {
        printf("Write disk Succeed!\n");
    }else
    {
        printf("Write disk failed heihei!\n");
    }

    if(dwReadByte==0)
    {
        printf("open disk 0 error!!\n");
    }
    FILE *fp;
    if((fp=fopen("C:\\BOOT.dat","wb"))!=NULL)
    fwrite(bBuffer,sizeof(BYTE),sizeof(bBuffer),fp);
    else
        printf("create file failed!\n");
    fclose(fp);
    if((fp=fopen("C:\\BOOT.dat","rb"))!=NULL)
        fread(rBuffer,1,sizeof(rBuffer),fp);
    fclose(fp);
    
    ShowByteInform(bBuffer,uReadSize);
    getchar();
    return 0;
}
void ShowByteInform(PBYTE pBuf,UINT uSize)
{
    for(UINT i=1;i<=uSize;i++)
    {
        printf("%02X",pBuf[i-1]);
        if(i%16==0)
            putchar('\n');
        else if(i%8==0)
            printf(" ");
    }
}