opencl interop with directx9

OpenCL
1

Hi, all

	IDirect3D9*	d3d	=NULL;
	d3d = Direct3DCreate9(D3D_SDK_VERSION);  
	if (d3d == NULL)  
	{  
		//error handle
	}  
	//set Direct3D presentation parameters  
	D3DPRESENT_PARAMETERS d3dp;   
	ZeroMemory(&d3dp, sizeof(d3dp));  
	d3dp.Windowed = TRUE;  
	d3dp.SwapEffect = D3DSWAPEFFECT_DISCARD;  
	d3dp.BackBufferFormat = D3DFMT_UNKNOWN;  
	//create Direct3D device  
	IDirect3DDevice9*	pDevice	=NULL;
	HRESULT	hr	=d3d->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,  
		D3DCREATE_SOFTWARE_VERTEXPROCESSING,  
		&d3dp, &pDevice );   
	if (pDevice == NULL)  
	{  
		//error handle
	}   

	clGetDeviceIDsFromD3D9NV_fn	clGetDeviceIDsFromD3D9NV	=
	(clGetDeviceIDsFromD3D9NV_fn)clGetExtensionFunctionAddress("clGetDeviceIDsFromD3D9NV");
	if (clGetDeviceIDsFromD3D9NV==NULL) 
	{
		//error handle
	}
	cl_uint	uNum(0);
	err	=clGetDeviceIDsFromD3D9NV(gid, CL_D3D9_DEVICE_NV, pDevice, CL_PREFERRED_DEVICES_FOR_D3D9_NV, 1, &g_Device, &uNum);

I use code above, but when I invoke clGetDeviceIDsFromD3D9NV, I got the return value -1. what`s wrong?thank you.

2

problem solved according to nvidia sample.
thanks to nvidia.