Hi,

I have a managed package that deals with project output groups. Output
groups are accessed through IVsProjectCfg2.get_OutputGroups() method using
following code:

private IVsOutputGroup[] GetOutputGroups( IVsProjectCfg2 config )
{
   uint[] elementCount = new uint[1];
   IVsOutputGroup[] groups;

   NativeMethods.ThrowOnFailure( config.get_OutputGroups( 0, null,
elementCount ) ); // Getting total number of output groups
   groups = new IVsOutputGroup[elementCount[0]]; // Allocating target array
   NativeMethods.ThrowOnFailure( config.get_OutputGroups( elementCount[0],
groups, null ) ); // Filling out array

   return groups;
}

Everything is OK with C#, VB and even Setup projects, but as soon as I pass
configuration object from C++ project I've got an NullReferenceException at
the second call to get_OutputGroups. First call reports that this
configuration has 5 output groups, second call (to fill array) fails. I just
can't understand where the problem is. Another strange thing is that if (in
debugger) I'll change elementCount[0] from 5 to 1 just before second call
(when array is allocated) than reference to one of the groups is placed to
groups array. I've experimented with other values (from 2 to 5 :-) but in
all other cases error is reported by the call.

Can anybody point me to workaround or provide any hint?

Regards,
Gregory.