There are two types of descriptors: heap descriptors (HBufC) and
stack descriptors (TBuf). All descriptors use one of
these types for storage. When the stack overflows, 90 percent of the time
it is caused by large descriptors on the stack. Be aware of operations that
cause implicit copying of descriptors, and avoid them where possible. It may
be better in some situations to allocate HBufCs to work
on rather than TBufs
Some related Symbian OS classes, such as TParse,
can also use up a lot of stack space. Consider using alternative versions
that use less stack space (for example, TParseBase).
Passing descriptors by reference is preferred to passing by value.