How to pass a pointer in labview library call function by using dll programmed in Labwindows?

Hi,

I'm trying to interface a camera with Labview.  However, the camera can only be programmed by C, so I'm using Labwindow CVI.

I need to pass a camera handle from one function to another, eg. from a opencamera function to setparameter function.  

/* Load the Qcam driver and Open the First Camera */
void DLLEXPORT LoadDriverAndOpenCamera()
{
QCam_CamListItem cameraList[10];
unsigned long cameraListLength=sizeof(cameraList)/sizeof(cameraList[0]);

//load the driver
QCam_LoadDriver();
//get a list of the cameras
QCam_ListCameras(cameraList,&cameraListLength);
//listLength is now the number of cameras available

QCam_Handle hCam;
//Open the first camera in the list
QCam_OpenCamera(cameraList[0].cameraId, &hCam);
}

Apparently, caemraId is an unsigned long (unsigned 32-bit in Labview 2012 32-bit? ) and QCam_Handle is defined as void*, so it's a pointer that points to an unsigned 32-bit.

When I only use C for programming, I can pass hCam variable to other functions as long as it's declared as global variable.  Ex, the next function can be void SetParameter(QCam_Handle hCam).  However, here I'm trying to make a dll by Labwindows/CVI and then call LoadDriverAndOpenCamera() function through library call in Labview.  

My question is:  How can I pass hCam to other functions in the same dll?  Do I have to add paramter to the function? For example:

void DLLEXPORT LoadDriverAndOpenCamera(unsigned long cameraId, QCam_Handle* cameraHandle)

And then add two lines:

cameraId=cameraList[0].cameraId;
cameraHandle=hCam;

into the function?  Then I can pass cameraHandle out?  However, hCam will still have void* type.

Even if that's the case, how can I set up library call node on Labview?  In the arg parameter set up, I don't see pointers?  It seems I cannot set up an output node to be a pointer that points to a unsigned long.

Thank you very much for your help!

Best,

Charles