Get Product Number using NI-XNET

Question

I'm trying to get the product number and name of the National
Instruments card installed on my computer. According to the manual when
I get the property for nxPropDev_Name I should get NI PCI-8512 (2 ports)
for an NI PCI-8512 device. Instead I get an empty Cstring. For
nxPropDev_ProductNum I should get 8512 for an NI PCI-8512 device, but
instead I get this number: 3435973836.
Below is a snippet of the code I'm using. Is there something I am doing
incorrectly?
Thanks
int propSize;
int cpropSize;
u32 propName;
CString cpropName;
char *l_pSelectedInterface = "CAN2";
char *l_pFrameArray = NULL;
char *l_pSelectedDatabase = ":memory:";
char *l_pSelectedCluster = "";
g_nxStatus = (*m_pNxCreateSession)(l_pSelectedDatabase,
l_pSelectedCluster,
l_pFrameArray,l_pSelectedInterface,
nxMode_FrameInStream, &SessionRef);
g_nxStatus = (*m_pNxGetPropertySize)(SessionRef, nxPropDev_ProductNum,
(u32)(&propSize));
g_nxStatus = (*m_pNxGetProperty)(SessionRef, nxPropDev_ProductNum,
(u32)(propSize),
&propName);
g_nxStatus = (*m_pNxGetPropertySize)(SessionRef, nxPropDev_Name,
(u32)(&cpropSize));  g_nxStatus = (*m_pNxGetProperty)(SessionRef, nxPropDev_Name, (u32)(&cpropSize)); 

Answer 1

This is probably making the impossible difficult, but you cannot get from the session back to the device directly. It is actually a separate API (right now - ideally we can improve this to make it easier in the future) called the system API to get system->device->interface type of properties.Using the system API, I am doing the following:
1) Open System
2) Get all interfaces in the system
3) Loop on the interfaces until I find one that has a name that matches the desired one
4) Once I get the interface, I can get the device that the interface is a part of
5) Once I get the device, I can then query the device for the required information (Name, Number)
6) Close System
Note: This doesn't do any error checking for simplicity, but it does get the status so you could easily apply error checking to prevent any type of ugly unexpected failures.
int l_NumInterfaces;
int l_PropSize;
u32 l_PropProductNum;
char l_PropProductName[1024];
char l_PropInterfaceName[1024];
nxSessionRef_t l_PropInterfaceRefs[32];
nxSessionRef_t l_SystemRef;
nxSessionRef_t l_SelectedDeviceRef;
char *l_pSelectedInterface = "CAN2";
char *l_pFrameArray = NULL;
char *l_pSelectedDatabase = ":memory:";
char *l_pSelectedCluster = "";
int i;
g_Status = nxSystemOpen(&l_SystemRef);
g_Status = nxGetPropertySize(
l_SystemRef,
nxPropSys_IntfRefs,
&l_PropSize
g_Status = nxGetProperty(
l_SystemRef,
nxPropSys_IntfRefs,
l_PropSize,
l_PropInterfaceRefs
l_NumInterfaces = l_PropSize/sizeof(nxSessionRef_t);
for (i = 0; i < l_NumInterfaces; i++)
g_Status = nxGetPropertySize(
l_PropInterfaceRefs[i],
nxPropIntf_Name,
&l_PropSize
g_Status = nxGetProperty(
l_PropInterfaceRefs[i],
nxPropIntf_Name,
l_PropSize,
l_PropInterfaceName
if (!strcmp(l_PropInterfaceName, l_pSelectedInterface))
g_Status = nxGetProperty(
l_PropInterfaceRefs[i],
nxPropIntf_DevRef,
sizeof(nxSessionRef_t),
&l_SelectedDeviceRef
g_Status = nxGetProperty(
l_SelectedDeviceRef,
nxPropDev_ProductNum,
sizeof(u32),
&l_PropProductNum
g_Status = nxGetPropertySize(
l_SelectedDeviceRef,
nxPropDev_Name,
&l_PropSize
g_Status = nxGetProperty(
l_SelectedDeviceRef,
nxPropDev_Name,
l_PropSize,
l_PropProductName
break;
g_Status = nxSystemClose (l_SystemRef);