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VB Forum / Win API / November 2008Create a persistant Virtual Drive
I am working on a data storage application which will manager CD/DVD changer (Jukebox). The changer has two drives one of which will be used to write data and the other will be used to handle read requests. Additionaly the changer has 200 slots in which to store discs. What I want to do is to present the changer as a drive on the host PC. This drive will need to be a virtual drive. I would then like to map each disc in the chager as a folder within the virtual drive. This virtual drive could then be shared and thereby make the contents of the changer available to all on the network. Writing to the discs will be done via IMAPI2 and I think I will be able to figure that one out as there are many examples on MSDN. However I can not seem to find a way to create a virtual drive mapped (sort of) to the changer. I am aware of the technique of using the subst DOS command but that has a couple of problems. The first problem is that mappings made that way are not persistated. When I reboot the system the mapping is gone. The second problem with this technique is that it maps a folder to the virtual drive not a device. Can anybody suggest a technique for creating this virtual drive mapped to the changer? Thanks, Steve > Can anybody suggest a technique for creating this virtual drive > mapped to the changer? I have no idea if this is optimal, but if you can share the drive, NET will let you create a persistent mapping to it: NET USE X: \\server\share /persistent:yes Nothing says that the share can't be on the same machine... You can do this in code as well using the net API.  SignatureJim Mack MicroDexterity Inc www.microdexterity.com > > Can anybody suggest a technique for creating this virtual drive > > mapped to the changer? [quoted text clipped - 12 lines] > MicroDexterity Inc > www.microdexterity.com Will this work for a device? If so what would the syntax be. Also what is the specific API for doing this? Thanks, Steve >>> Can anybody suggest a technique for creating this virtual drive >>> mapped to the changer? [quoted text clipped - 9 lines] > > Will this work for a device? If so what would the syntax be. No idea. If it's a shareable resource, then maybe. I was reacting to your mention of SUBST, for which NET USE is an analog. However, this won't create a drive where none exists. Nero, among others, allows you to create virtual CDs from disk files, but this isn't quite a match for that either. > Also what is the specific API for doing this? The API equivalent of NET USE is WNetAddConnection2. SignatureJim Mack MicroDexterity Inc www.microdexterity.com > Will this work for a device? If so what would the syntax be. Also > what is the specific API for doing this? Check this VB6 sample: http://vbnet.mvps.org/code/network/wnetaddconnection2.htm Also, check MSDN for DefineDosDevice() and SetVolumeMountPoint(). I have never used them, so I don't know if they are suitable to your situation. They require NT or Windows 2000 or above. Another way is to use Shell() to run subst. Use "subst /?" to the list of commands. Hello! You wrote on Thu, 13 Nov 2008 14:31:39 -0800 (PST): S> Can anybody suggest a technique for creating this virtual drive mapped S> to the changer? Please check Callback File System ( http://www.eldos.com/cbfs/ ) which lets you create virtual drives with whatever data you have. Mapper sample will give you a tip regarding how to map the individual "real" disks to the folders of the virtual disk. With best regards, Eugene Mayevski http://www.eldos.com/ - security and virtual storage components > Hello! > You wrote on Thu, 13 Nov 2008 14:31:39 -0800 (PST): [quoted text clipped - 9 lines] > With best regards, > Eugene Mayevskihttp://www.eldos.com/- security and virtual storage components That looks like exactly what I need...bit too pricey for me though. thanks, Steve Hello! You wrote on Fri, 14 Nov 2008 16:48:38 -0800 (PST): S> That looks like exactly what I need...bit too pricey for me though. The product is very complex internally. You are welcome to apply for a private business license on http://www.eldos.com/cbfs/price-list.php . If you are a small company or an individual developer, you will get a huge discount. With best regards, Eugene Mayevski http://www.eldos.com/ - security and virtual storage components > Hello! > You wrote on Fri, 14 Nov 2008 16:48:38 -0800 (PST): [quoted text clipped - 8 lines] > With best regards, > Eugene Mayevskihttp://www.eldos.com/- security and virtual storage components Eugene, As I say, your product does look like it would do what I need. However I am developing an application whose sole purpose is a "proof of concept" application for a project I am working on. If I can make this work (and thereby prove the concept) my employer would most likely go with a canned package that provides all the required functionality. That said I am not totaly convinced there is such a canned package so I may still wind up having to "roll my own". I would like it very much if we could take this conversation offline and we could discuss the detaiks of my requirements and you could describe how your product could meet those needs. If you care to do this you can email me at "s redmyer AT yahoo DOT com". Obviously you will need to remove the spaces and such to get a valid email address. Thanks, Steve |
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