visual 2010 settings for testing a C dll

Hi, 

I am writing a C dll with Visual 2010 and I am not able to test it with TestComplete

The simplest function of this library is "increment" that only returns the input parameter plus 1:

#ifndef mylib_h__
#define mylib_h__

#ifdef __cplusplus
extern "C" {
#endif

#ifdef _WINDOWS
#ifdef  CALLBACKLIBRARY_EXPORTS
#define DLLDIR __declspec (dllexport)
#else
#define DLLDIR __declspec (dllimport)
#endif
#else
#define DLLDIR
#endif


int DLLDIR __stdcall increment(int x);

#ifdef __cplusplus
}
#endif


#endif

In TestComplete, we define a JScript with this code:

function TestSimply()
{
  var def_DLL,ret;
 
  // Defines the dll type
  def_DLL = DLL["DefineDLL"]("callbacklibrary");
  def_DLL["DefineProc"]("increment", vt_int, vt_int);
 
  // Loads the dll.
  Lib = DLL["Load"]("C:\\Tests\\callbacklibrary.dll");  
      
    //Call the function from the library
    ret = Lib["increment"](10);    
 
}

When we run the test, TestComplete shows this error:

"object doesn't support this property or method"

We do not know if it is a bad configuration of Visual or defining test in TestComplete

Could you help me, please?

Thanks in advance

Amparo