Dear Friends,

I have a Dll written in VC++ and now I want to access that dll from my Vb application.

I have so many calls in that vc++ dll.

Example :

typedefstruct tripWireSettings_Tag{
bool bTripWireAnalytic;
U8 u8NoOfTripWires;
StructU32Point stStartPoint[MAX_NUM_TRIP_WIRES];
StructU32Point stEndPoint[MAX_NUM_TRIP_WIRES];
EnumDirection eTripwireDirection[MAX_NUM_TRIP_WIRES];
} tripWireSettings;

this structure internally calls one more structure "StructU32Point "

typedefstruct StructU32Point_Tag
{
U32 u32X;
U32 u32Y;
}StructU32Point;

Now I am trying to access this strcuture from my Vb application, as following,

I declared these structures in module as

Public Type tripWireSettings_Tag
bTripWireAnalytic As Boolean
u8NoOfTripWires As Byte
stStartPoint(MAX_NUM_TRIP_WIRES) As StructU32Point_Tag
stEndPoint(MAX_NUM_TRIP_WIRES) As StructU32Point_Tag
eTripwireDirection(MAX_NUM_TRIP_WIRES) As EnumDirection_Tag
End Type

and

Public Type StructU32Point_Tag
u32X As Long
u32Y As Long
End Type

Public Declare Function va_set_tripwire_info Lib "Intrulib.dll" (ByVal lCamHandle As Long, Byref g_sParam As tripWireSettings_Tag) As Long

In VB form,

I will Call a Dll function as below,

Dim tSettings As tripWireSettings_Tag
tSettings.bTripWireAnalytic = True
tSettings.u8NoOfTripWires = 1
tSettings.stStartPoint(0).u32X = 50
tSettings.stStartPoint(0).u32Y = 40
tSettings.stEndPoint(0).u32X = 299
tSettings.stEndPoint(0).u32Y = 199
tSettings.eTripwireDirection(0) = Right

lRet = va_set_tripwire_info(lCamHandle, tSettings)

After this when i run my Vb application, I'm not able to get proper values from VC++ Dll, its returning Junk values,

Really I am serachng for answers from so many days. Please help me "How to pass complex structres as parameters to a VC++ dll from Vb application."

Thanks in advance....