CPPUNIT_ASSERT(pMemInStream2->IsOk());
CPPUNIT_ASSERT_EQUAL((wxFileOffset)len2, pMemInStream2->GetLength());
pMemInStream2->Read(dat, len2);
CPPUNIT_ASSERT(pMemInStream2->IsOk());
CPPUNIT_ASSERT_EQUAL((wxFileOffset)len2, pMemInStream2->GetLength());
pMemInStream2->Read(dat, len2);