C++读取硬盘信息

MBR结构，在数据库恢复中，若要手工填写分区表的话，只注意四个重要的地方，其它的可随便填。

#pragma pack(1) //字节对齐
typedef struct _PARTITION_ENTRY//分区表结构
{
    UCHAR active; //状态（是否被激活）   重要
    UCHAR StartHead; //分区起始磁头号
    //UCHAR StartSector; //分区起始扇区和柱面号,高2位为柱面号的第 9,10 位, 高字节为柱面号的低 8 位
    //UCHAR StartCylinder; // 起始磁盘柱面
    USHORT StartSecCyli; //与63相位与得出的是开始扇区，把它右移6位就是开始柱面
    UCHAR PartitionType; // 分区类型   重要
    UCHAR EndHead; //分区结束磁头号
    //UCHAR EndSector; //分区结束扇区
    //UCHAR EndCylinder; // 结束柱面号
    USHORT EndSecCyli; //与63相位与得出的就是结束扇区，把它右移6位就是结束柱面
    ULONG StartLBA; // 扇区起始逻辑地址   重要
    ULONG TotalSector; // 分区大小      重要
} PARTITION_ENTRY, *PPARTITION_ENTRY;

//引导区512BYTE结构
typedef struct _MBR_SECTOR
{
    UCHAR BootCode[440];//启动记录440 Byte
    ULONG DiskSignature;//磁盘签名
    USHORT NoneDisk;//二个字节
    PARTITION_ENTRY Partition[4];//分区表结构64 Byte
    USHORT Signature;//结束标志2 Byte 55 AA
} MBR_SECTOR, *PMBR_SECTOR;
#pragma pack()

扩展分区暂时未写，代码基本上copy+理解，主要是学习并理解分区表

运行如图

void _ReadMbrPartiton(CListBox *listbox)
{
    TCHAR   szDevicename[64]={0};
    char *drive = "1";
    MBR_SECTOR _ReadMbr;
    wsprintf(szDevicename,"\\.\\PHYSICALDRIVE%c",*drive);
    HANDLE hDevice=CreateFile(szDevicename,
                          GENERIC_READ|GENERIC_WRITE,
                          FILE_SHARE_READ|FILE_SHARE_WRITE,
                          NULL,
                          OPEN_EXISTING,
                          0,
                          NULL);
    if(hDevice == INVALID_HANDLE_VALUE)
    {
        //MessageBox("打开设备出错");
        return;
    }

    memset(&_ReadMbr,0,sizeof(MBR_SECTOR));
    DWORD leng = 512;
    DWORD count;
    DeviceIoControl(hDevice,FSCTL_LOCK_VOLUME,NULL,0,NULL,0,&count,NULL);
    BOOL bcheck = ReadFile(hDevice,&_ReadMbr,512,&leng,NULL);
    if (bcheck==FALSE || leng<512)
    {
        //MessageBox("读取MBR出错！");
        DeviceIoControl(hDevice, FSCTL_UNLOCK_VOLUME, NULL, 0, NULL, 0, &count, NULL);
        CloseHandle(hDevice);
        return;
    }
    listbox->ResetContent();//清除
    TCHAR * szTemp = new TCHAR[64];
    //char * Temp = new char[64];
    //for
    for (int i=0;i<4;i++)
    {
        if (_ReadMbr.Partition[i].PartitionType==0)
        {
            continue;
        }
        memset(szTemp,0,64);
        //memset(Temp,0,64);
        if (_ReadMbr.Partition[i].active == 128)
        {
            strcat(szTemp,"Active ");
        } else
        {
            strcat(szTemp,"NotActive ");
        }

        if (_ReadMbr.Partition[i].PartitionType==5 || _ReadMbr.Partition[i].PartitionType==15 )
        {
            strcat(szTemp,"Extended ");
        }

        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"80=active partition:%02X",_ReadMbr.Partition[i].active);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"Start head:%d",_ReadMbr.Partition[i].StartHead);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        int temp = _ReadMbr.Partition[i].StartSecCyli;
        wsprintf(szTemp,"Start sector:%d",temp & 63);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"Start cylinder:%d",temp>>6);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"Partition type indicator (hex):%02d",_ReadMbr.Partition[i].PartitionType);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"End head:%d",_ReadMbr.Partition[i].EndHead);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        temp = _ReadMbr.Partition[i].EndSecCyli;
        wsprintf(szTemp,"End sector:%d",temp & 63);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"End cylinder:%d",temp>>6);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"Sectors preceding partition 1:%d",_ReadMbr.Partition[i].StartLBA);
        listbox->AddString(szTemp);
        memset(szTemp,0,64);
        wsprintf(szTemp,"Sectors in partition 1:%d",_ReadMbr.Partition[i].TotalSector);
        listbox->AddString(szTemp);
        //若是扩展分区
        if (_ReadMbr.Partition[i].PartitionType=15 || _ReadMbr.Partition[i].PartitionType==5)
        {
            BOOL bcon = TRUE;
            //第一次进来保存 0扇区到扩展分区的绝对扇区

            while (bcon)
            {

            }
        }

    }
    //for

    DeviceIoControl(hDevice, FSCTL_UNLOCK_VOLUME, NULL, 0, NULL, 0, &count, NULL);
    CloseHandle(hDevice);

}