直接读取扇区来拷贝文件的例子

使用函数
DeviceIoControl(hFile, FSCTL_GET_RETRIEVAL_POINTERS, &InBuf, 
  sizeof(InBuf), OutBuf, OutSize, &Bytes, NULL))
就可以查询文件的簇链

下面是个例如直接读取扇区来拷贝文件的例子
用法：FileCopy("C://boot.ini", "D://boot.ini");

C/C++ code

ULONGLONG *GetFileClusters(    LPCSTR lpFileName,    ULONG ClusterSize,     ULONG *ClCount,    ULONG *FileSize     ){    HANDLE  hFile;    ULONG   OutSize;    ULONG   Bytes, Cls, CnCount, r;    ULONGLONG *Clusters = NULL;    BOOLEAN Result = FALSE;    LARGE_INTEGER PrevVCN, Lcn;    STARTING_VCN_INPUT_BUFFER  InBuf;    PRETRIEVAL_POINTERS_BUFFER OutBuf;    hFile = CreateFile(lpFileName, FILE_READ_ATTRIBUTES,                       FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,                       NULL, OPEN_EXISTING, 0, 0);    if (hFile != INVALID_HANDLE_VALUE)    {        *FileSize = GetFileSize(hFile, NULL);        OutSize = sizeof(RETRIEVAL_POINTERS_BUFFER) + (*FileSize / ClusterSize) * sizeof(OutBuf->Extents);        OutBuf = (PRETRIEVAL_POINTERS_BUFFER)malloc(OutSize);        InBuf.StartingVcn.QuadPart = 0;                if (DeviceIoControl(hFile, FSCTL_GET_RETRIEVAL_POINTERS, &InBuf,                             sizeof(InBuf), OutBuf, OutSize, &Bytes, NULL))        {            *ClCount = (*FileSize + ClusterSize - 1) / ClusterSize;            Clusters = (PULONGLONG)malloc(*ClCount * sizeof(ULONGLONG));            PrevVCN = OutBuf->StartingVcn;            for (r = 0, Cls = 0; r < OutBuf->ExtentCount; r++)            {                Lcn = OutBuf->Extents[r].Lcn;                for (CnCount = (ULONG)(OutBuf->Extents[r].NextVcn.QuadPart - PrevVCN.QuadPart);                     CnCount; CnCount--, Cls++, Lcn.QuadPart++) Clusters[Cls] = Lcn.QuadPart;                PrevVCN = OutBuf->Extents[r].NextVcn;            }        }                    free(OutBuf);            CloseHandle(hFile);    }        return Clusters;}BOOL FileCopy(LPCSTR lpSrcName, LPCSTR lpDstName){    BOOL bResult = FALSE;    ULONG         ClusterSize, BlockSize;    ULONGLONG    *Clusters;    ULONG         ClCount, FileSize, Bytes;    HANDLE        hDrive, hFile;    ULONG         SecPerCl, BtPerSec, r;    PVOID         Buff;    LARGE_INTEGER Offset;    CHAR          Name[7];        Name[0] = lpSrcName[0];    Name[1] = ':';    Name[2] = 0;    GetDiskFreeSpace(Name, &SecPerCl, &BtPerSec, NULL, NULL);    ClusterSize = SecPerCl * BtPerSec;    Clusters = GetFileClusters(lpSrcName, ClusterSize, &ClCount, &FileSize);    if(Clusters)    {        Name[0] = '//';        Name[1] = '//';        Name[2] = '.';        Name[3] = '//';        Name[4] = lpSrcName[0];        Name[5] = ':';        Name[6] = 0;        hDrive = CreateFile(Name, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, 0);        if (hDrive != INVALID_HANDLE_VALUE)        {            hFile = CreateFile(lpDstName, GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, 0);            if (hFile != INVALID_HANDLE_VALUE)            {                Buff = malloc(ClusterSize);                for (r = 0; r < ClCount; r++, FileSize -= BlockSize)                {                    Offset.QuadPart = ClusterSize * Clusters[r];                    SetFilePointer(hDrive, Offset.LowPart, &Offset.HighPart, FILE_BEGIN);                    ReadFile(hDrive, Buff, ClusterSize, &Bytes, NULL);                    BlockSize = FileSize < ClusterSize ? FileSize : ClusterSize;                    WriteFile(hFile, Buff, BlockSize, &Bytes, NULL);                }                free(Buff);                CloseHandle(hFile);                bResult = TRUE;            }            CloseHandle(hDrive);        }        free(Clusters);    }    else    {        printf("GetFileClusters fail./n");    }    return bResult;}