// StopwatchClient.cpp : 
//   Defines the entry point for the console application.
//
// Changes to #include "Stopwatch.h" and #define TIMERSDLL to set path

// std::out etc
#include <iostream>

#include "Stopwatch.h"

// NOTE:  The following line will vary depending on 
// where the Timers.dll is located.
#define TIMERSDLL "C:\\CIS630\\Chapter2\\Part1\\Timers\\Debug\\Timers.dll"

typedef HRESULT (__stdcall *DLLGETCLASSOBJECT)(REFCLSID rclsid, 
  REFIID riid, LPVOID* ppv);

// Instantiates a stopwatch object and returns it by reference
HRESULT CreateInstance(void** ppv)
{
  HRESULT hr = E_FAIL;
  HINSTANCE hinstDll;
  DLLGETCLASSOBJECT DllGetClassObject;
  GUID guid;

  hinstDll = LoadLibrary(TIMERSDLL);
  if (hinstDll == NULL) 
    std::cout << "Unable to load \"" TIMERSDLL "\"" << std::endl;
  else
  {
    DllGetClassObject = 
      (DLLGETCLASSOBJECT) GetProcAddress(hinstDll, 
        "DllGetClassObject");
    if (DllGetClassObject != NULL) 
      hr = DllGetClassObject(guid, guid, ppv);
  } 
  return hr;
}


int main(int argc, char* argv[])
{
  float nElapsedTime;
  HRESULT hr;
  IStopwatch* pStopwatch = NULL;

  hr = CreateInstance((void**) &pStopwatch);

  if ( !SUCCEEDED(hr) )
    std::cout << "ERROR: Unable to create Stopwatch!!";

  else
  {
    pStopwatch->Start();
    pStopwatch->ElapsedTime( &nElapsedTime );

    std::cout << "The overhead time is "  
      << nElapsedTime << std::endl;

    pStopwatch->Release();
    
    pStopwatch = NULL;

  }

  return 0;
}