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POGetting missing component error in a VB6 application
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copied!<p>I have a VB6 app that has a ton of 3rd party components. The app works well, but on exit (and only when running as a standalone EXE, e.g. not in the IDE), it pops up an error message:</p> <p><img src="https://i.stack.imgur.com/KIWiJ.png" alt="enter image description here"></p> <p>I've seen errors like these before but typically it says which component is missing dependencies or is not registered properly.</p> <p>I ran it through Process Monitor and got the following files that it cannot find:</p> <p><img src="https://i.stack.imgur.com/6EM5Y.png" alt="enter image description here"></p> <p>And then it quits. I googled the file names that it cannot find and can't seem to find anything. It seems like its searching for a variation of MSComENU, MSComEN and MSCOENU dlls.</p> <p>I checked and rechecked to make sure that all the the 3rd party components are there and they are - the application functions fine, it wouldn't if they weren't there.</p> <p>It is worth noting that error occurs after the last line of VB6 code (in <code>Form_Unload</code> event) has fired. I know this because the last line is a message box that does appear.</p> <p><strong>Much, much later EDIT</strong>: I finally got back to dealing with the problem and figured it out by process of elimination (and it was a loooong process). In the end it had nothing to do with any MSCOMM*.dll entries. In fact, I do not know why they still show up in Process Monitor. The problem was much simpler. </p> <p>I had several 3rd party controls on the main form. In an effort not to pollute the main form with a ton of event handling code, I delegated these controls to a new class, like so:</p> <pre><code>' declaration code in main form' Private WithEvents moDelegateObject as clsDelegateObject ' still in the main form, after initialization' Set moDelegateObject = new clsDelegateObject With moDelegateObject Set .ThirdPartyCtlHandler1 = me.ThirdPartyCtl1 Set .ThirdPartyCtlHandler2 = me.ThirdPartyCtl2 Set .ThirdPartyCtlHandler3 = me.ThirdPartyCtl3 end with ' declarations and properties inside of clsDelegateObject' Private WithEvents moThirdPartyCtlHandler1 as ThirdPartyCtl Private WithEvents moThirdPartyCtlHandler2 as ThirdPartyCtl Private WithEvents moThirdPartyCtlHandler3 as ThirdPartyCtl Public Event FooEvent() ' other various events as well ' Public Property Set ThirdPartyCtlHandler1(o as ThirdPartyCtl) moThirdPartyCtlHandler1 = o End Property Public Property Get ThirdPartyCtlHandler1() as ThirdPartyCtl ThirdPartyCtlHandler1 = moThirdPartyCtlHandler1 End Property ' ... Repeat for each handler ...' </code></pre> <p>What was missing was code to explicitly deallocate these objects prior to closing. This is something that Visual Basic typically does. So I added the following in the Form_QueryClose in the main form:</p> <pre><code>With moDelegateObject Set .ThirdPartyCtlHandler1 = Nothing Set .ThirdPartyCtlHandler2 = Nothing Set .ThirdPartyCtlHandler3 = Nothing End with Set moDelegateObject = Nothing </code></pre> <p>Last line turned out to be superflous, but I threw it in there for completeness sake. I think it was a combination of delegating controls to a delegate class and receiving events from it in the Main form and using a good number of really obscure 3rd party controls which contributed to this problem. It is probable that the 3rd party control does not cleanly deallocates itself. Anyway, lesson learned. </p>

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