Using keyhelp.ocx to display popup HtmlHelp in a modern Visual Studio C++ application fails.
I get a COM exception with no sensible error code. Looking at the debug output, there seems to be an Access Violation behind the scenes.
Why is keyhelp.ocx failing in my Visual Studio C++ application?
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Your executable is build with Data Execution Prevention enabled, via
/NXCOMPAT. That's the default in Visual Studio.keyhelp.ocxis built using ATL7, which is incompatible with DEP - see http://support.microsoft.com/kb/948468You need to disable DEP (
/NXCOMPAT:NO) for your executable or find an alternative tokeyhelp.ocx(I don't know of one).(Note that's it's possible to enforce DEP system-wide - your code will still fail on such machines.)