How do I import this vc++ dll file in vc# in VS2012

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I want to use the functions setmap of dll in vc# applciation.
How can i import the class used in this dll.
please guide for the same.
Thankyou.

// Test.h

#pragma once

#ifdef COMPILE_TEST_DLL
#define TEST_DLL __declspec(dllexport)
#else
#define TEST_DLL __declspec(dllimport)
#endif

class TEST_DLL test_map {

public:

test_map(int amplifiersNumber);
~test_map();
bool setmap1(float val1,char val2, float val3, char val4);
bool setmap2(float val5);

float * calculatemap3();

};