The FSCTL_LOCK_VOLUME DeviceIoControl operation locks a volume. A locked volume can be accessed only through handles to the file object (*hDevice) that locks the volume.
dwIoControlCode = FSCTL_LOCK_VOLUME; // operation code lpInBuffer = NULL; // pointer to input buffer; not used; must be NULL nInBufferSize = 0; // size of input buffer; not used; must be zero lpOutBuffer ; // pointer to output buffer; not used; must be NULL nOutBufferSize ; // size of output buffer; not used; must be zero lpBytesReturned ; // pointer to DWORD used by DeviceIoControl function
If the operation succeeds, DeviceIoControl returns a nonzero value.
If the operation fails, DeviceIoControl returns zero. To get extended error information, call GetLastError.
The hDevice handle passed to DeviceIoControl must be a handle to a volume, opened for direct access. An application can obtain such a handle by calling CreateFile with lpFileName set to a string that looks like this:
where X is a hard-drive partition letter, floppy disk drive, or CD-ROM drive. The application must also specify the FILE_SHARE_READ and FILE_SHARE_WRITE flags in the dwShareMode parameter of CreateFile.
The FSCTL_LOCK_VOLUME operation fails if there are any open files on the volume. Conversely, success of this operation indicates there are no open files.
The operation is useful for applications that need exclusive access to a volume for a period of time¾for example, disk utility programs.
A locked volume remains locked until one of the following occurs:
The system flushes all cached data to the volume before locking it. For example, any data held in a lazy-write cache is written to the volume.
CloseHandle, CreateFile, DeviceIoControl, FSCTL_UNLOCK_VOLUME
|file: /Techref/os/win/api/win32/func/src/f26_9.htm, 4KB, , updated: 2001/8/27 07:07, local time: 2022/5/23 16:46,
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