Re: MultiUse ActiveX Exe creates multiple instances (Round 2)
From: Niall Quiggin (niall.quiggin_at_puzuma.xtek.xray.com)
Date: 03/10/04
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Date: Wed, 10 Mar 2004 17:29:55 -0000
Thank you once again. I think that I have now got it sorted now.
Best regards,
Niall Quiggin
"Alexander Nickolov" <agnickolov@mvps.org> wrote in message
news:uY6GwzWBEHA.1548@TK2MSFTNGP12.phx.gbl...
GetObject is your problem. It tries to find an entry in the ROT
for your object, it fails and then starts another instance, which
promptly exits thus the CO_E_SERVER_EXEC_FAILURE code. Simply
put - do not use GetObject. You can register your main object
in ROT (and create it at startup), but that means you want all
of your clients to share the same object instance. OTOH, if
you use CoCreateInsance (e.g. CreateObject from VB), you can
have many objects living in the same server.
-- ===================================== Alexander Nickolov Microsoft MVP [VC], MCSD email: agnickolov@mvps.org MVP VC FAQ: http://www.mvps.org/vcfaq ===================================== "Niall Quiggin" <niall.quiggin@puzuma.xtek.xray.com> wrote in message news:UY63c.2500$m56.1149@newsfe1-win... > Thanks for the reply and to Tian Min Huang. I know that the problem is not a > race condition when registering the classes. I have confirmed this by mking > the change. > > I have changed the DCOM configuration to be the interactive user and made > the changes as suggested. Go the code in the InitInstance method now reads > as follows. > > if ( !mFirstInstance ) > { > // Signal to existing intance to show GUI and then exit. > } > else > { > // Register class factories via CoRegisterClassObject(). > if (FAILED(_AtlModule.RegisterClassObjects(CLSCTX_LOCAL_SERVER, > REGCLS_MULTIPLEUSE))) > return FALSE; > // Handle various start up cases > // Createdialog > // Show dialog in modal manner. > // ... > } > return FALSE; > > Now the way I test if this working OK is that I run up an instance to the > application from Explorer. When it is running, I then run the test harness > application that is written in VB and I debug it using VS.NET 2003 IDE. When > I try to use GetObject() to connect to the code, I get an exception ("Cannot > create ActiveX component at Microsoft.VisualBasic.Interaction.GetObject"). I > have also tried just making a new object of the required type. When I do > this, there is a long time lag of some 10 or so seconds and then I get an > exception ("System.Runtime.InteropServices.COMException (0x80080005). Server > execution failed."). > > So as you can see, I still cannot connect to an existing instance which is > vital to me. What am I doing wrong? > > Best regards, > Niall Quiggin. > > "Alexander Nickolov" <agnickolov@mvps.org> wrote in message > news:eDbnpIUBEHA.3256@TK2MSFTNGP09.phx.gbl... > First comment is, you must use the interactive user for your > server's identity. That's because you want manual startup from > the interactive user. > > Second comment is, you must check if an instance of your server > is already running if started by the interactive user (e.g. no > /Embedding command-line argument). If your server is already > running, instead of registering your class objects and proceeding, > you have to signal the other instance to show its GUI, and then > exit the new instance. Of course, you also need to implement the > code that accepts such signals and shows the GUI so this executes > in the hidden running server. Note, you may even have the server > showing GUI and the interactive user starting another instance > (or trying at least). In that case, simply use SetForegroundWindow > to bring the other process' main window to the foreground, then > exit. > > -- > ===================================== > Alexander Nickolov > Microsoft MVP [VC], MCSD > email: agnickolov@mvps.org > MVP VC FAQ: http://www.mvps.org/vcfaq > ===================================== > > "Niall Quiggin" <niall.quiggin@puzuma.xtek.xray.com> wrote in message > news:FmH2c.1602$7g5.908@newsfe3-win.server.ntli.net... > > I made a post about this on 13 February and got a very helpful reply. I > > thought that I had the answer that I needed, but I never tested it as I > had > > other things more pressing to do. To re-iterate the problem: > > > > I have created an ActiveX server written in C++. This is an MFC based > > executable that has a number of COM interfaces. I am using VS.NET 2003 to > > build this application and testing with a test harness written in VB.NET > > (original it was to be C#). I need this server application to run as a > local > > server, and to be manually run up (this is simple as the application can > be > > run when the user logs on). Periodically the VB code will be executed and > it > > will connect to the COM server using GetObject(), does some work and then > > disconnects. The server is to stay running. > > > > To create the COM server in C++, I made a new MFC executable application > > with automation selected. I then added ATL objects for the separate COM > > interfaces (which automatically added ATL support). In the InitInstance > > method of the application class there is the following code: > > > > // Register class factories via CoRegisterClassObject(). > > if (FAILED(_AtlModule.RegisterClassObjects(CLSCTX_LOCAL_SERVER, > > REGCLS_MULTIPLEUSE))) > > return FALSE; > > > > It would seem that this is all that is required to make the server only > have > > one instance. But it is not. I found out in the reply to the last post > that > > I needed to configure DCOM so that it ran up the server application as a > > specific user (interactive or specified user and *not* the launching user > > which is the default). I have tried both settings and neither work for me > as > > the multiple instances of the server are run up. > > > > I am wondering if the problem is that I manually run up the initial > instance > > of the server application, i.e. run it directly from Explorer before > running > > the VB code. > > How do I achieve just one instance of the server for all? > > > > Best regards, > > Niall Quiggin > > > > > > > > > >
- Next message: John Phillips: "Re: How to get the current module name"
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- In reply to: Alexander Nickolov: "Re: MultiUse ActiveX Exe creates multiple instances (Round 2)"
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