Re: Memory leak with CAsyncSocket::Create


"r norman" <r_s_norman@xxxxxxxxxxxx> wrote in message
news:2895939efidggi556s7fbje0euhm2jd2d0@xxxxxxxxxx
I have traced a memory leak problem to CAsyncSocket::Create(). Is
this a known problem? Is there a workaround/solution/fix? Here is
sample code:

for (int i=0; i<m_nReopenCount; ++i) {
CAsyncSocket *pAS = new CAsyncSocket;
pAS->Create();
pAS->Close();
delete pAS;
}

Running this 1000 times uses up 1200 KBytes of memory, or just over 1
KByte per call. Commenting out the Create() leaves memory clean. (And
please don't complain about my bracketing style -- I like it.)



This is a known problem, acknowledged by Microsoft.

Apparently, when using CAsyncSocket in a GUI app that also has XP visual
styles (themes), there is a memory leak. The problem seems to be
OS-dependent, and it might exist only under XP (running themes). It did not
manifest itself under Win 2000, and it might be gone now from Vista.

For one report, see "CSocket Consuming Memory Uncontrollably" at
http://www.codeguru.com/forum/showthread.php?t=353944 . I am fairly certain
that this is the same problem that you are seeing, since this report also
includes the exact same number for the amount of leaked memory (i.e., 1200
bytes per call to Create()).

There is a parallel posting in the newsgroups at "HELP!! CSocket and
CAsyncSocket Consumes Memory Uncontrollably" in the
microsoft.public.win32.programmer.networks newsgroup, at
http://groups.google.com/group/microsoft.public.win32.programmer.networks/browse_frm/thread/8490cdb5c4f18c76/b87332dbee0cb54c?tvc=1

The "solution", if you can call it that, is to disable themes. See
"CAsynCSocket Memory Leak Fix" at
http://www.codeguru.com/forum/showthread.php?t=370761

Mike


.

Relevant Pages

  • Re: Memory leak with CAsyncSocket::Create
    ... CAsyncSocket *pAS = new CAsyncSocket; ... Commenting out the Createleaves memory clean. ... there is a memory leak. ... non-child window by CAsyncSocket::AttachHandle. ...
    (microsoft.public.vc.mfc)
  • Re: Memory leak with CAsyncSocket::Create
    ... CAsyncSocket *pAS = new CAsyncSocket; ... Commenting out the Createleaves memory clean. ... see "CSocket Consuming Memory Uncontrollably" at ... There is a parallel posting in the newsgroups at "HELP!! ...
    (microsoft.public.vc.mfc)
  • Re: Memory leak with CAsyncSocket::Create
    ... And many thanks again both to you Joe and you AliR for your major ... CAsyncSocket *pAS = new CAsyncSocket; ... Running this 1000 times uses up 1200 KBytes of memory, ... There is a parallel posting in the newsgroups at "HELP!! ...
    (microsoft.public.vc.mfc)
  • Re: Memory leak with CAsyncSocket::Create
    ... CAsyncSocket *pAS = new CAsyncSocket; ... Commenting out the Createleaves memory clean. ... there is a memory leak. ...
    (microsoft.public.vc.mfc)
  • Re: Memory leak with CAsyncSocket::Create
    ... So you may have located a serious bug in MFC; ... memory and my comments I noted in my code at the time. ... The Create method is creating a socket ... CAsyncSocket *pAS = new CAsyncSocket; ...
    (microsoft.public.vc.mfc)
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