Xceed Zip for COM/ActiveX on x86/x64 Documentation
Direct DLL API / DLL API Event handling by callback functions
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    DLL API Event handling by callback functions
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    Event notification by callback functions can be selected by calling the XzSetXceedZipCallback function with a pointer to your callback function in the second parameter. Your callback function must have this form:

    void CALLBACK YourXceedZipCallback( WPARAM wXceedMessage, LPARAM lParam )

    Your callback function will be called whenever an event is triggered. Your callback function's wXceedMessage parameter will contain the event index number, and the lParam parameter will contain a pointer to the corresponding parameter structure. Depending on the value of wXceedMessage, you should typecast lParam to the correct structure pointer.