Example of a COM Memory Leak

An example of COM Memory leakage.

Variant var;

Variantinit (& var );

Var. Vt = vt_bstr;

Var. bstrval =: sysallocstring ("2222");/* Memory leakage */

Variantclear (VAR );

Required

Sysfreestring (var. bstrval );

Variantclear (VAR );

For such leaks, VC ide will be powerless, because it is only good at matching new and delete.

We also recommend that you use the ATL or C ++ packaging classes whenever possible. Let them manage the application and release of your BSTR and variant variables.

Because in the process of writing, if you writeCodeMore than one, it is easy to forget to release the variable. In this case, the root cause of the problem is hard to find.