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I tracked down the "missing" leak reports and was surprised to see that the DCRT library termination functions call _CrtSetDumpClient with a parameter of NULL, thus clearing out my dump hook before calling _CrtDumpMemoryLeaks I was distressed by this behavior until it dawned on me that I just had to do the final memory leak checking myself Fortunately, I had the perfect place to do it Because I was already using the #pragma init_seg(compiler) directive to get the AutoMatic class initialized before your code and to call the destructor after your code, I just needed to do the leak checking there and then turn off the _CRTDBG_LEAK_CHECK_DF flag so that the DCRT library didn't do its own reporting The only caveat with using this approach is that you need to make sure that the CRT library of your choice comes before BUGSLAYERUTILLIB if you link with the /NODEFAULTLIB switch.

2. 3.

When you link against BUGSLAYERUTILLIB, the CRT libraries can't depend on their #pragma init_seg(compiler) directive to ensure that their data gets initialized first and destroyed last, so you need to enforce the correct ordering yourself If you think about it, having the DCRT library clear out any dump hooks installed makes sense If your dump hook were using any CRT library functions, such as printf, it could crash the termination of your program because the library is in the middle of shutting down when _CrtDumpMemoryLeaks is called If you follow the rules and always link with the DCRT library before any other libraries, you'll be fine because the MemDumperValidator functions are shut down before the DCRT library shuts down To avoid problems, use the _RPTn and _RPTFn macros only in your dumper functions anyway, because _CrtDumpMemoryLeaks uses only these macros.

It s unusual, but you may find a case where you think you need to write your own model. Typically, you d need to do this if you can t provide all the data at once say, because of pending network or file system activity (however, Qt has support for SQL tables and file system directories through models it provides). Creating your own model isn t hard; you need only inherit from the appropriate base class (QAbstractItemModel, QAbstractListModel, or QAbstractTableModel for one- or twodimensional or tree models, respectively) and override the methods that implement the structure appropriate for your data. You ll need to override two kinds of methods: Methods that describe the organization of your data, such as the rowCount and columnCount methods. Methods that permit access and mutation of your data, such as the data and setData methods. In addition, when implementing the data-access methods, you ll want to be sure that you emit the appropriate signals when data changes in your model or the model s size itself changes. The Qt documentation provides good information about how to do this for pointers on creating both a simple list model and a tree model.

Using MemStress Now it's time to add a little stress to your life Believe it or not, stress can be a good thing Unfortunately, stressing Win32 applications is much harder these days than it used to be In the days of 16-bit Windows systems, we could run our programs through their paces with STRESSEXE, a neat program that comes with the SDK STRESSEXE allowed you to torment your application in all sorts of nasty ways, such as eating up disk space, gobbling up the graphics device interface (GDI) heap, and using up file handles It even had a cool icon: an elephant walking a tightrope To stress your Win32 applications, you can hook into the DCRT library's allocation system and control whether allocations succeed or fail The MemStress extension gives you a means to stress your C and C++ memory allocation.

(I'll leave it up to you to write the diskeating code) To make MemStress easy to use, I wrote a Windows Forms front end that lets you specify under exactly what conditions you'd like your allocation to fail The MemStress extension lets you force allocation failures based on various criteria: all allocations, on every n allocation, after x bytes are allocated, on requests over y bytes, on 644.