Calling a C++ DLL function from VB.NET having structure pointer

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VB

Hi,

I am using C++ DLL from my VB.NET project using DLLImport. But I have not experience of how to handle the pointer in VB.NET.

The C++ function call & declaration is a below.

EXTERNC T_PDU_ERROR PDUGetModuleIds(PDU_MODULE_ITEM **pModuleIdList)

where 

typedef struct {
T_PDU_IT ItemType; 
UNUM32 NumEntries; 
PDU_MODULE_DATA *pModuleData; 
} PDU_MODULE_ITEM;

typedef struct {
UNUM32 ModuleTypeId; 
UNUM32 hMod; 
CHAR8 *pVendorModuleName; 
CHAR8 *pVendorAdditionalInfo; 
T_PDU_STATUS ModuleStatus; 
} PDU_MODULE_DATA;

Please tell me how to use the C++ DLL from my VB.NET application.

Thanks in advance