It is possible to instruct the debugger to break when an exception occurs, before a handler is invoked. Visual Studio allows you to specify what category or particular exception you want to break on. The Watch windows or the QuickWatch dialog support some special (debugger-recognized) variables called pseudovariables. Sometimes you'd like to watch the value of an object (on the heap) even after the symbol goes of scope. It is possible to continue to watch it in full capability if you know the address of the object. In the example bellow, _foo is no longer accessible in the Watch window after stepping out of do_foo(). Many times when you debug the code you probably step into functions you would like to step over, whether it's constructors, assignment operators or others.
Having this enabled, even when you press to step into take_a_string() in the above example the debugger skips the CString's constructor. Seldom you might need to attach with the debugger to a program, but you cannot do it with the Attach window (maybe because the break would occur too fast to catch by attaching), nor you can start the program in debugger in the first place. DebugBreak() function, but this is not portable, so the intrinsic is the recommended method. When your program executes the intrinsic it stops, and you get a chance to attach a debugger to the process. Memory leaks are an important problem in native development and finding them could be a serious challenging especially in large projects.
It is possible to instruct the debugger to break when data at a certain memory location changes.


In the example below, the value of a pointer is changed, instead of the value of the object it points to.
How Can I Find Out If My Pointers Corrupt a Memory Address?How Can I Find Out Where My Pointer Is Getting Changed? When you debug multi-threaded applications the Threads window shows you what threads are created and which one is currently running. It is also possible to programmatically name a thread, though this is a little bit trickier and must be done after the thread has started, otherwise the debugger will re-initialize it with its default naming convention.
Another helpful technique for multi-threading applications is to filter the breakpoints to certain threads, processes or even computers.
When you watch variables in the Watch or Quick Watch window, the values are displayed using the default pre-defined visualizers. Apart from numbers, the debugger can also show formatted memory values, up to 64 bytes, in the Watch window. The braces can contain any combination of function name, source and module, but the commas must not be omitted.
Run the program and when it breaks, ignore the message that there is no source code associated with the breakpoint. If you want to get memory leak reports in MFC application you can re-defined the new operator with a DEBUG_NEW macro, which is a modified version of the new operator that keeps track of the filename and line number for each object that it allocates. When you develop ATL COM components you can get some help from the debugger to watch calls for QueryInterface, AddRef and Release on your COM objects.
Though the article presents some rather basic tips of debugging with Visual Studio, there are others at least as helpful as those. You can then cast the address to a pointer of the object type and put that in the Watch window.


Visual Studio displays a report of the leaked objects, and running this several times I could see it's always the same allocation number (341). You can use the Call Stack to navigate back to your code where the allocation was triggered.
While a Debug configuration is used for development, a Release configuration, as the name implies should be used for the final version of a program. These tips work with Visual Studio 2005 or newer (and at least some of them with older versions too). Even though you can watch both values on the stack and on the heap, I'd say this feature is mostly helpful to find when values on the heap are changed. To figure out where that happens I set a breakpoint on the memory where the value of the pointer is stored, i.e. When the data changes, which means someone alters the value of the pointer, the debugger breaks and I can figure which piece of code is responsible for that.
When it comes to numbers, these are displayed according to their types (integer, float, double) and using the decimal base.
When those macros are defined information about these calls is displayed in the Output window. You can get additional information about each technique if you follow the recommended readings.



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