mfc 裸写sd卡扇区

#include "stdafx.h"
#include
#include "stdafx.h"
#include "types_def.h"
#include "compat_error.h"
#include "compat_sem.h"
#include
#include




extern void HexDump(char *buf, int len, int addr);


#define READ   0
#define WRITE  1


//通过给定磁盘的编号,获取到磁盘的句柄                
HANDLE GetDiskHandle( int iDiskNo, int op_mode )
{         
    char szDriverBuffer[128];
    memset( szDriverBuffer, 0, 128 );
    //格式化设备文件名称
    sprintf_s( szDriverBuffer, "\\\\.\\PhysicalDrive%d", iDiskNo );
    HANDLE m_hDevice = NULL;
    //CreateFile获取到设备句柄
    if( op_mode == READ ){
        m_hDevice = CreateFileA( szDriverBuffer, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
            NULL, OPEN_EXISTING, NULL, NULL );
    }else if( op_mode == WRITE ){
        m_hDevice = CreateFileA( szDriverBuffer, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
            NULL, OPEN_EXISTING, NULL, NULL );
    }
    //szDriverBuffer --> 设备名称,这里指第一块硬盘,多个硬盘的自己修改就好了
    //GENERIC_READ --> 指定读访问方式
    //GENERIC_WRITE  --> 指定写访问方式
    //FILE_SHARE_READ | FILE_SHARE_WRITE --> 共享模式为读|写,0表示不能共享
    //NULL --> NULL表示该句柄不能被子程序继承
    //OPEN_EXISTING --> 打开已经存在的文件,文件不存在则函数调用失败
    //NULL --> 指定文件属性
    //NULL
    if( m_hDevice == INVALID_HANDLE_VALUE ){                      
        m_hDevice = NULL;
        //无效
        return INVALID_HANDLE_VALUE;
    }
    //设备句柄
    return m_hDevice;
}         






        










//通过磁盘的句柄,给定读取的位置,获取到扇区512字节数据返回
//readpos:扇区的逻辑地址
//lpOutBuffer512:用于返回读取的数据
BOOL ReadSectorData( HANDLE& hDevice, UINT64 readpos, __out char *lpOutBuffer512 )
{
    LARGE_INTEGER li;
    DWORD DCount;
    BOOL bResult;
    memset( lpOutBuffer512, 0, 512 );
    li.QuadPart = readpos*0x200;
    //0x200 = 512,求出扇区的字节地址,通过设置读取的地址和长度进行read
    SetFilePointer( hDevice, li.LowPart, &li.HighPart, FILE_BEGIN );          
    DCount = 0;
    //计数
    bResult = ReadFile( hDevice, lpOutBuffer512, 512, &DCount, NULL );    
    HexDump(&lpOutBuffer512[0], 512, 0);
    return bResult;
}






//通过磁盘的句柄,给定写入数据的位置,写入512字节数据到指定扇区
//writepos:写入扇区的逻辑地址
//lpInBuffer512:准备写入的数据buff
BOOL WriteSectorData( HANDLE& hDevice, UINT64 writepos, __in char *lpInBuffer512 )
{      
    LARGE_INTEGER li;
    DWORD DCount;
    BOOL bResult;
    li.QuadPart = writepos * 0x200;
    //0x200 = 512,求出扇区的字节地址,通过设置写入的地址和长度进行write
    SetFilePointer( hDevice, li.LowPart, &li.HighPart, FILE_BEGIN );             
    DCount = 0;
    //计数
    bResult = WriteFile( hDevice, lpInBuffer512, 512, &DCount, NULL );
    return bResult;
}










int mytestudisk_main( void )
{        
    char *lpInOutBuffer512;
    HANDLE m_hDevice = NULL;
    TRACE( "in mytestudisk_main\r\n" );
    lpInOutBuffer512 = (char *)malloc(512+1);
    m_hDevice = GetDiskHandle( 1, READ );
    ReadSectorData( m_hDevice, 14, lpInOutBuffer512 );
    CloseHandle(m_hDevice);
    HexDump( &lpInOutBuffer512[0],512, 0);


    
    m_hDevice = GetDiskHandle( 1, WRITE );
    lpInOutBuffer512[0] = 0x5a;
    HexDump(&lpInOutBuffer512[0], 512, 0);
    WriteSectorData(m_hDevice, 14, &lpInOutBuffer512[0]);
    CloseHandle(m_hDevice);
    free(lpInOutBuffer512);
    lpInOutBuffer512 = NULL;
    return 0;
}