a problem with dynamicCast

when i using the IceInternal::Handle seens a problem:

there is a shared lib:

// testlib.h
namespace XPP
{

class TestIceBase1 : public Ice::Object
{
int data_;
};
class TestIceBase2
{
int data_;
};

class TestIceObject1 : //virtual public TestBase ,
virtual public Ice::Object
{

};

typedef IceInternal::Handle<TestIceObject1> TestIceObject1Ptr;

class TestIceObject2 : virtual public TestIceBase1
{

};

typedef IceInternal::Handle<TestIceObject2> TestIceObject2Ptr;

TestIceBase1 * g_ice_object1;
TestIceBase1 * g_ice_object2;
TestXPPBase1 * g_XPP_object1;
TestXPPBase1 * g_XPP_object2;

void init_object();

}

// testlib.cpp

#include "testlib.h"

using namespace XPP;

void XPP::init_object()
{
g_ice_object1 = new TestIceObject1;
g_ice_object2 = new TestIceObject2;
g_XPP_object1 = new TestXPPObject1;
g_XPP_object2 = new TestXPPObject2;
}


then there is a exe program:
// test.cpp
int main( char ** argv , int argc )
{
XPP::init_object();

// test ice object1
{
printf("g_ice_object1: ");
// XPP::TestIceObject1Ptr testobj = XPP::TestIceObject1Ptr::dynamicCast( XPP::g_ice_object1 );
XPP::TestIceObject1 * testobj = dynamic_cast<XPP::TestIceObject1 *>( XPP::g_ice_object1.get() );
if( testobj ) {
printf("ok\n");
} else {
printf("failed\n");
}
}

// test ice object1
{
printf("g_ice_object2: ");
XPP::TestIceObject2Ptr testobj = XPP::TestIceObject2Ptr::dynamicCast( XPP::g_ice_object2 );
if( testobj ) {
printf("ok\n");
} else {
printf("failed\n");
}
}
}


after run the test program, the result always failed, can someone can tell me what is the problem is?