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Editorial Team
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Asked: 2026-05-16T10:50:07+00:00

I’m running Delphi 2009. When I try to view a form in the form

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I’m running Delphi 2009. When I try to view a form in the form editor I keep getting a stack overflow. So I did what anyone else would do. I used Delphi to debug itself or rather another instance of the IDE.

So I know where the overflow is occuring I just don’t know what to do about it. There is a custom component on this form that is intercepting calls to TForm.WindowProc so it can respond to certain winapi messages. The stack overflow is occuring when the component invokes the real WindowProc.

When I break on the exception the call stack is filled with hundreds of calls to:

delphicoreide120.@Comppalmgr@TComponentPalettePageItemDelegate@CheckValid

So far I haven’t had any luck tracking down the actual message being passed to WindowProc.

Any help would be appreciated.

Update

I’ve made some progress. Tracked down the message that appears to be setting this off. It’s WM_CHILDACTIVATE. When this message gets passed to the form’s WindowProc it sets off a series of calls within the IDE that ends with a stack overflow. Now I just need to figure out why.

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1 Answer

  1. Editorial Team

    Ugh! It wound up being a third party component package I had recently installed and was completely unrelated to where the exception was occurring. Tried viewing a blank form in a new project with the same results.

    Something went wrong either with the compilation or installation of the package. Rebuilding/reinstalling it made the exception disappear.

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