Setting Types in C

No way with Byte Ptr, my Strings are alway empty :(

So whats with C++? I've tested this:
Ref.cpp

#include <brl.mod/blitz.mod/blitz.h>
#include <windows.h>

class TTest {
public:
	BBString *a;
	BBString *b;
	BBString *c;

	TTest() {
		a = &bbEmptyString;
		b = &bbEmptyString;
		c = &bbEmptyString;
	}

	virtual ~TTest() {
		a = &bbEmptyString;
		b = &bbEmptyString;
		c = &bbEmptyString;
	}
	
	virtual void getTest() {
		a = bbStringFromCString("Foo");
		b = bbStringFromCString("Bar");
	
		char info[255];
		sprintf(info, "%d ms", GetTickCount());
		c = bbStringFromCString(info);
	}
};


extern "C" {

TTest *CreateTTest(){
	return new TTest;
}

void DestroyTTest(TTest *test) {
	delete test;
}

}

Ref.bmx

SuperStrict

Framework BRL.Blitz

Import "ref.cpp"

Extern 

Type TTest
	Field a : String
	Field b : String
	Field c : String

	Method _pad1() ' padding for virtual destructors
	Method _pad2()
	Method getTest()
End Type

Function CreateTTest:TTest()
Function DestroyTTest(test:TTest)

End Extern

Local test:TTest = CreateTTest()
For Local i:Int = 0 Until 1000
	test.getTest()
	DebugLog test.a + " " + test.b + " " + test.c
	Delay 10
Next

DestroyTTest(test)

Getting some times output like:

DebugLog:FooDebugLog:Foo Bar 4498281 ms
...
DebugLog:Foo 4500109 ms 4500109 ms

Whats wrong?

cu olli