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<DIV><FONT size=2>Hi.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Actually the chunk of memory returned by pcap_stats_ex should
not be freed by the caller, since it's managed directly by the pcap library.
Basically, it's preallocated inside the pcap_t structure; every call to
pcap_stats_ex fills the array with fresh stats, and returns the same pointer to
the caller.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>You can see the implementation of such function in the online
winpcap documentation, at</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2><A
href="https://www.winpcap.org/docs/docs31beta4/html/Win32-Extensions_8c-source.html#l00062">https://www.winpcap.org/docs/docs31beta4/html/Win32-Extensions_8c-source.html#l00062</A></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Have a nice day</FONT></DIV>
<DIV><FONT size=2>GV</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=cavemangsz@gmail.com href="mailto:cavemangsz@gmail.com">Gal
Szkolnik</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=winpcap-users@winpcap.org
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, June 06, 2005 3:08 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Winpcap-users] freeing memory
allocated by pcap_stats_ex viewpcap.dll</DIV>
<DIV><BR></DIV>Hello.<BR>I've been using WinPCap for a long time now with a C#
application we constructed over here (= my work place), and am very pleased
with it.<BR> <BR>I have one problem which I can't fix gracefully, and was
wondering if anyone can help me. <BR> <BR>As I understand from the code,
pcap_stats_ex allocates the memory for the user, and later the user is
responsible to deallocate it.<BR>My problem is that I am accesing wpcap.dll
through PInvoke and don't have access to the memory managment functions used
in the pcap dll. <BR> <BR>Another issue, is if used from another exe or
dll (this time unmanaged regular C++ or C) if the compiler/libraries are
different from what winpcap.dll was built with they would not be compatible
when freeing memory. <BR> <BR>I would suggest a solution: Use a
free_stats function in wpcap.lib which frees the allocated buffer. The user
still deallocates the structure, but does it via a function call to the dll.
This ensures deallocation is done correctly. <BR> <BR>Tell me what you
think? and if you'll change the source code and add this
function<BR> <BR>-- <BR>Truly Yours<BR>Gal Szkolnik
<P>
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