Hi,

I am new to xpcom. I have two mozilla installation environments on
which only one of my mozilla executables work. The other one crashes.
When I follow the function call chain I cannot go any further than the
call:

mStreamListener->OnDataAvailable(request,
                                 NULL,
                                 NS_STATIC_CAST(nsIInputStream *,
this),
                                 mOffset,
                                 aLen);

where, the declarations are:

nsCOMPtr<nsIStreamListener> mStreamListener;
nsCOMPtr<nsIRequest> request;

because I don't know what this call does. How can I follow the
execution flow _within_ this call? Can someone clearly explain what it
does? Where does the execution flow go from here?

Its important because when I get a stack trace for the crashing
executable, I find out that neither of the function calls on the stack
during crash have been called from the working executable. So I need
to know what the working one does within this function call that the
crashing one doesn't do.

Many thanks for your help,
Bahadir
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