The FSCTL_DISMOUNT_VOLUME DeviceIoControl operation dismounts a volume.
dwIoControlCode = FSCTL_DISMOUNT_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.
If the specified volume is locked, the operation fails.
A dismounted volume has the following properties:
The operating system tries to mount an unmounted volume as soon as any attempt is made to access it. For example, a call to GetLogicalDrives triggers the operating system to mount any unmounted volumes.
Dismounting a volume is useful whenever a volume needs to disappear for a while. For example, an application that changes a volume’s file system from FAT to NTFS might follow these steps:
A dismounting operation removes the volume from the FAT file system’s “awareness.” When the operating system mounts the volume, it appears as an NTFS volume.
CreateFile, DeviceIoControl, ExitThread, GetLogicalDrives
|file: /Techref/os/win/api/win32/func/src/f26_7.htm, 4KB, , updated: 2000/4/7 11:19, local time: 2016/2/7 14:04,
|©2016 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?|
<A HREF="http://www.piclist.com/techref/os/win/api/win32/func/src/f26_7.htm"> FSCTL_DISMOUNT_VOLUME</A>
|Did you find what you needed?|
PICList 2016 contributors:
o List host: MIT, Site host massmind.org, Top posters @20160207 RussellMc, Bob Blick, Peter, alan.b.pearce, embedded systems, Neil, Dwayne Reid, Isaac Marino Bavaresco, IVP, Jean-Paul Louis,
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
Welcome to www.piclist.com!