CoInitializeEx function fails after calling the HtmlHelp function on the same thread
This article discusses an issue where the CoInitializeEx function fails after calling the HtmlHelp function on the same thread.
Applies to: All supported operating system
Symptoms
If an application calls HtmlHelp before calling CoInitializeEx with the specified COINIT_MULTITHREADED value, CoInitializeEx can return RPC_E_CHANGED_MODE (0x80010106). As a result, the application may crash, hang, or display unexpected behavior.
Cause
If a thread that calls HtmlHelp hasn't been initialized with CoInitialize or CoInitializeEx, HtmlHelp initializes the thread as apartment-threaded with COINIT_APARTMENTTHREADED.
Workaround
To work around the issue and avoid the conflict of COM initialization on a single thread, create a new thread and call HtmlHelp on that thread.
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