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.NET Forum / Languages / Managed C++ / June 2004Replace exe and dll in use
Hi all, I have 2 questions: 1) As I know there is no way on Windows to replace a running exe, but somebody told me that this is doable, and I couldn't find any info on how could this be done programmatically. Is something like this possible? And if yes, how? 2) My product has a dll that is used by multimple application from the system. Is there any way in which I could update this dll (without killing all the exe that have loaded this dll)? Or this is doable only over a reboot? If it's only over a reboot, how could I do the following: i have in the same dir dll and dll_new, how could I do in one step: delete dll and rename dll_new with dll? Thanks in advance, Viv > Hi all, > [quoted text clipped - 12 lines] > same dir dll and dll_new, how could I do in one step: delete dll and > rename dll_new with dll? In both cases, you can't. Depending on what operating system you're running you may be able to rename or move the file and copy a new file with the old file name, but the running programs will continue to use the old file until the programs are restarted.  Signature-GJC [MS Windows SDK MVP] -Software Consultant (Embedded systems and Real Time Controls) - http://www.mvps.org/ArcaneIncantations/consulting.htm -gchanson@mvps.org Hi, "MoveFileEx" function is to be used for this purpose. I've been using it to replace system dll by older-versioned dlls that were working better and that windows didn't want to replace due to higher version number ! have a look at this msdn article Q140570 too : http://support.microsoft.com/default.aspx?scid=kb;en-us;140570 regards, arno > Hi all, > [quoted text clipped - 15 lines] > Thanks in advance, > Viv Hi Viviana, MoveFileEx MOVEFILE_DELAY_UNTIL_REBOOT Does this help with question 2? Best regards, Slobodan > Hi all, > [quoted text clipped - 15 lines] > Thanks in advance, > Viv Yes it does. Thx! Looks like the following: MoveFileEx(szDstFile, NULL, MOVEFILE_DELAY_UNTIL_REBOOT); MoveFileEx(szSrcFile, szDstFile, MOVEFILE_DELAY_UNTIL_REBOOT); would make the trick of: deleting the old dll and renaming the new dll as the old one, all of them over a reboot, as those dlls are used by a lot of application and even by the system so they can be done only over a reboot. Viv >Hi Viviana, > [quoted text clipped - 24 lines] >> Thanks in advance, >> Viv >Hi all, > [quoted text clipped - 4 lines] >how could this be done programmatically. Is something like this >possible? And if yes, how? Not directly. But you can have an auxiliary program that stops your main program, replaces it, and restarts it. >2) My product has a dll that is used by multimple application from the >system. Is there any way in which I could update this dll (without >killing all the exe that have loaded this dll)? Or this is doable only >over a reboot? How about renaming the old DLL, copying in (or renaming) the replacement, and letting each program start using the new version whenever it restarted? If you have a list of programs that you want to coerce, you could close and restart them. >If it's only over a reboot, how could I do the following: i have in the >same dir dll and dll_new, how could I do in one step: delete dll and >rename dll_new with dll? > >Thanks in advance, >Viv ----------------------------------------- To reply to me, remove the underscores (_) from my email address (and please indicate which newsgroup and message). Robert E. Zaret, eMVP PenFact, Inc. 500 Harrison Ave., Suite 3R Boston, MA 02118 www.penfact.com >>Hi all, >> [quoted text clipped - 7 lines] >Not directly. But you can have an auxiliary program that stops your >main program, replaces it, and restarts it. Yes, already thought about this being the only way out ... >>2) My product has a dll that is used by multimple application from the >>system. Is there any way in which I could update this dll (without [quoted text clipped - 4 lines] >replacement, and letting each program start using the new version >whenever it restarted? Upss, I didn't know that I could rename a dll that is already loaded by some applications! Because I couldn't replace it I thought that also renaming will fail. Seems not. And the same if for the running exes. But in the dll case, as I don't know all the app that have loaded it, so I can not restart only those, I will need a reboot anyhow, so I could also use the MoveFileEx right? >If you have a list of programs that you want to coerce, you could >close and restart them. [quoted text clipped - 14 lines] >Boston, MA 02118 >www.penfact.com clip >>>2) My product has a dll that is used by multimple application from the >>>system. Is there any way in which I could update this dll (without [quoted text clipped - 11 lines] >I can not restart only those, I will need a reboot anyhow, so I could >also use the MoveFileEx right? Rename is a special case of Move. I use MoveFile, not MoveFileEx. And not for anything tricky. So I'm quite sure you're getting better info about MoveFileEx in another set of responses. ----------------------------------------- To reply to me, remove the underscores (_) from my email address (and please indicate which newsgroup and message). Robert E. Zaret, eMVP PenFact, Inc. 500 Harrison Ave., Suite 3R Boston, MA 02118 www.penfact.com Hi Viviana, MoveFileEx MOVEFILE_DELAY_UNTIL_REBOOT Does this help with question 2? Best regards, Slobodan PS: Sorry if this is second time that I post this but I can't see my yesterdays post. > Hi all, > [quoted text clipped - 15 lines] > Thanks in advance, > Viv
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