[winstonma]

Hi all,
It is my first time to use the direct screen access example from nokia to create a program, however, I met some problems when I build the project.
Here is the ERROR and my CODE:
error LNK2001: unresolved external symbol "public: static class CVideoPlayerTest * __cdecl CVideoPlayerTest::NewL(class RWsSession &,class CWsScreenDevice &,class RWindow &,int)" (?NewL@CVideoPlayerTest@@SAPAV1
@AAVRWsSession@@AAVCWsScreenDevice@@AAVRWindow@@H@Z)

My Code:
// VideoPlayerTest.h
#ifndef DIRECTDISPLAYENG_H
#define DIRECTDISPLAYENG_H

#include <w32std.h>
//class CDirectDisplayRender;

enum DirectDisplayPanics{
DirectDisplayStarted = 1,
DirectDisplayStopped
};

const TInt KGenerationInterval = 10000;

_LIT(KDirectDisplayTxt, "Video");

class CVideoPlayerTest : public CTimer, public MDirectScreenAccess{
// Construction & destruction
public:

static VideoPlayerTest* NewL(
// The current window server session owned by the application
RWsSession& aClient,
// The default screen device for the application
CWsScreenDevice& aScreenDevice,
// The RWindow associated with a control.
RWindow& aWindow,
TInt aUserFrameBuffer
);

~CVideoPlayerTest();

private:
// private constructors - use NewL to call it
CVideoPlayerTest(
/*
* Window server handling
*/
// The current window server session owned by the application
RWsSession& aClient,
// The default screen device for the application
CWsScreenDevice& aScreenDevice,
// The RWindow associated with a control.
RWindow& aWindow,
TInt aUserFrameBuffer
);

void ConstructL();

public:
void StartDrawingL();
void StopDrawing();
// Are we drawing?
inline TBool Drawing() {return iDrawing;}

private:
void RunL();
void DoCancel();

private:
// Implement MDirectScreenAccess
void Restart(RDirectScreenAccess::TTerminationReasons aReason);
void AbortNow(RDirectScreenAccess::TTerminationReasons aReason);

private:
// Window Server handling
RWsSession& iClient;
CWsScreenDevice& iScreenDevice;
RWindow& iWindow;

// Direct Screen Access
CDirectScreenAccess* iDirectScreenAccess;
CFbsBitGc* iGc;
RRegion* iRegion;

// Are we drawing?
TBool iDrawing;

TInt iUserFrameBuffer;

TRect iFlagRect;
TInt iFrameBufLen;

TPoint iPosition;
};
#endif

// Following is the code in container
void CVideoPlayerContainer::ConstructL(const TRect& aRect)
{
CreateWindowL();

iLabel = new (ELeave) CEikLabel;
iLabel->SetContainerWindowL( *this );
iLabel->SetTextL( _L("Example View") );

SetRect(aRect);

iTest = CVideoPlayerTest::NewL(iEikonEnv->WsSession(),
*(CCoeEnv::Static()->ScreenDevice()),
Window(), 0);

ActivateL();
}

If i did not run the "iTest = CVideoPlayerTest::NewL();", there was not any problems.
So, that, I wanna ask anyone can help me???
Thanks a lot

[p_madden]

The linker is telling you that the actual code for the NewL function does not exist anywhere in your source files that were compiled. I only see the declaration of the NewL function in your header file but where is the implementation code?