how to use Qt dll in Win32 project

[Fastman]

Hmmm... but i'am have some trouble:

error LNK2019: unresolved external symbol "public: void __thiscall ISampleClass::DemoFunction1(void)" (?DemoFunction1@ISampleClass@@QAEXXZ) referenced in function _wmain

error LNK2019: unresolved external symbol "public: void __thiscall ISampleClass::DemoFunction1(void)" (?DemoFunction1@ISampleClass@@QAEXXZ) referenced in function _wmain

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#include "stdafx.h"
#include <string.h>
#include <iostream>
#include "../test/ISample.h"
#pragma comment(lib,"D:\\QT_PROJECT\\test\\debug\\test.lib") 
 
using namespace std;
 
 
int _tmain(int argc, _TCHAR* argv[])
{
	ISampleClass a;
	a.DemoFunction1();
	return 0;
}

#include "stdafx.h"
#include <string.h>
#include <iostream>
#include "../test/ISample.h"
#pragma comment(lib,"D:\\QT_PROJECT\\test\\debug\\test.lib") 

using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
	ISampleClass a;
	a.DemoFunction1();
	return 0;
}

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What wrong ???