Problems using a DLL

[prosass]

Hello everyone. I´m using Qt 4.2.2 and VisualStudio 2005.
My problem is I wanna make use of a Dll and I only get linking errors related to it.
I want to load the dll at compiling time, so I guess I don´t need to use QLibrary, am I right?
I have a header file with the name of the functions I can call.

Here it is the .h file (loc.h):

#ifndef LOC_H
#define LOC_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <windows.h>
#define LOC_ERR_FRAME_INCOMPL     -1
#define LOC_ERR_LONG              -2
#define LOC_ERR_CRC               -3
 
typedef struct loc_position_t {
  float x;
  float y;
} loc_position_t;
 
 
int loc_getposition(loc_position_t *p);
int loc_ini(void);
int loc_end(void);
 
#ifdef __cplusplus
}
#endif
 
#endif //LOC_H

#ifndef LOC_H
#define LOC_H

#ifdef __cplusplus
extern "C" {
#endif

#include <windows.h>
#define LOC_ERR_FRAME_INCOMPL     -1
#define LOC_ERR_LONG              -2
#define LOC_ERR_CRC               -3

typedef struct loc_position_t {
  float x;
  float y;
} loc_position_t;


int loc_getposition(loc_position_t *p);
int loc_ini(void);
int loc_end(void);

#ifdef __cplusplus
}
#endif

#endif //LOC_H

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I also include the dll file so you can see what it´s wrong.

I have used this code in Code::blocks without a problem, but now I wanna use it with Qt/VisualStudio and I get linking problems everytime I try to compile it.

Can anyone please help me?