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Editorial Team
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Asked: 2026-05-17T20:42:43+00:00

I am updating an old MFC application that used WinHelp so that it now

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I am updating an old MFC application that used WinHelp so that it now uses HtmlHelp. I’ve changed the constructor of CWinApp-based class so that it calls EnableHtmlHelp(). Then I’ve changed the old calls from WinHelp( IDH_CONTENTS, HELP_CONTEXT) to HtmlHelp( IDH_CONTENTS, HH_HELP_CONTEXT). Unfortunately, whenever I try to open the help from my application, I see the help window appear and then it and my application immediately close. If I step through the code line-by-line, the help file appears and stays visible. Does anybody have any idea what’s happening here and how I can fix it? Thanks.

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1 Answer

  1. Editorial Team

    Ok. I found it. I finally paid attention to this statement in the MSDN documentation:

    When using the HTML Help API, set the
    stack size of the hosting executable
    to at least 100k. If the defined stack
    size is too small, then the thread
    created to run HTML Help will also be
    created with this stack size, and
    failure could result.

    I changed my project settings to remove the Stack Reserve Size and now the help opens correctly.

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