How to Play Sound??

#define INITGUID
#include <dmusici.h>


IDirectMusicLoader8* g_pLoader      = NULL;
IDirectMusicPerformance8* g_pPerformance = NULL;
IDirectMusicSegment8*  g_pSegment    = NULL;


INT APIENTRY WinMain( HINSTANCE hInst, HINSTANCE hPrevInst, 
 LPSTR pCmdLine, INT nCmdShow )
{
 CoInitialize(NULL);
 
 CoCreateInstance(CLSID_DirectMusicLoader, NULL, 
    CLSCTX_INPROC, IID_IDirectMusicLoader8,
    (void**)&g_pLoader);

 CoCreateInstance(CLSID_DirectMusicPerformance, NULL,
    CLSCTX_INPROC, IID_IDirectMusicPerformance8,
    (void**)&g_pPerformance );

if (!g_pPerformance) // This will always execute when I compile... so NULL pointer is here.
{
MessageBox(NULL, "Could not create performance!!", "Debug Test", 48);
return 0;
}

 g_pPerformance->InitAudio( 
  NULL,       // IDirectMusic interface not needed.
  NULL,       // IDirectSound interface not needed.
  NULL,       // Window handle.
  DMUS_APATH_SHARED_STEREOPLUSREVERB, // Default audiopath type.
  64,        // Number of performance channels.
  DMUS_AUDIOF_ALL,  // Features on synthesizer.
  NULL        // Audio parameters; use defaults.
 );

  // Find the Windows media directory.
 
 CHAR strPath[512];
 if( GetWindowsDirectory( strPath, MAX_PATH+1 ) == 0 )
    return 0;
 strcat( strPath, "\\media" );
 
 // Convert to Unicode.
 
 WCHAR wstrSearchPath[MAX_PATH + 1];
 MultiByteToWideChar( CP_ACP, 0, strPath, -1, 
     wstrSearchPath, MAX_PATH );
 wstrSearchPath[MAX_PATH] = 0;

 // Set the search directory.
 
 g_pLoader->SetSearchDirectory( 
  GUID_DirectMusicAllTypes, // Types of files sought.
  wstrSearchPath,      // Where to look.
  FALSE           // Don't clear object data.
 );

 WCHAR wstrFileName[MAX_PATH] = L"ding.wav";
 
 if (FAILED(g_pLoader->LoadObjectFromFile(
  CLSID_DirectMusicSegment, // Class identifier.
  IID_IDirectMusicSegment8, // ID of desired interface.
  wstrFileName,       // Filename.
  (LPVOID*) &g_pSegment   // Pointer that receives interface.
 )))
 {
  MessageBox( NULL, "Media not found, sample will now quit.", 
     "DirectMusic Tutorial", MB_OK );
  g_pPerformance->CloseDown();
  g_pLoader->Release(); 
  g_pPerformance->Release();
  CoUninitialize();
  return 0;
 }

  g_pSegment->Download( g_pPerformance );

 g_pPerformance->PlaySegmentEx(
   g_pSegment, // Segment to play.
   NULL,    // Not used.
   NULL,    // For transitions. 
   0,      // Flags.
   0,      // Start time; 0 is immediate.
   NULL,    // Pointer that receives segment state.
   NULL,    // Object to stop.
   NULL     // Audiopath, if not default.
 ); 
 MessageBox( NULL, "Click OK to Exit.", "Play Audio", MB_OK );
 
  g_pPerformance->Stop(
   NULL, // Stop all segments.
   NULL, // Stop all segment states.
   0,  // Do it immediately.
   0   // Flags.
 );
 
 g_pSegment->Unload(g_pPerformance);
 g_pPerformance->CloseDown();
 
 g_pLoader->Release(); 
 g_pPerformance->Release();
 g_pSegment->Release();
 
 CoUninitialize();
  
 return 0; // Return value for WinMain.
}   // End of WinMain.