VB FSUIPC TCAS tables

[craig1231]

I am trying to read TCAS data and tried to read offset F068 (Traffic Range) but it returns 0, see if you can see where I am going wrong :D

Dim dwResult As Long
Dim range As Byte

FSUIPC_Read &HF000, 1, VarPtr(range), dwResult
FSUIPC_Process dwResult
MsgBox range

I have also tried to 'inject' the TCAS structure in to offset 1F80 as it says to in the FSUIPC SDK, but still no avail.

Public Type TCASData
    id As Single
    lat As Long
    lon As Long
    alt As Long
    hdg As Integer
    gs As Integer
    vs As Integer
    comm As Integer
    stat As Byte
    call As String * 15
End Type

    Dim tDat As TCASData
    Dim dwResult As Long

    FSUIPC_Write &H1F80, Len(tDat), VarPtr(tDat), dwResult
    FSUIPC_Process (dwResult)

And then I try reading the offset above and it still doesnt work :? . I hope I have explained it ok and I hope you are able to help.

Thanks

Craig

[Pete Dowson]

I am trying to read TCAS data and tried to read offset F068 (Traffic Range) but it returns 0, see if you can see where I am going wrong :D

Dim dwResult As Long
Dim range As Byte

FSUIPC_Read &HF000, 1, VarPtr(range), dwResult
FSUIPC_Process dwResult
MsgBox range

I can see two things wrong, easily, and I don't know VB at all!

First you say you want to read F068, yet you specify F000!

Second, I'm pretty sure that VB expands &HF000 to make a 32-bit value FFFFF000, which is certainly not what you want. I seem to remember someone saying you needed to postpend another & to stop it doing that, so try &HF068&.

I have also tried to 'inject' the TCAS structure in to offset 1F80 as it says to in the FSUIPC SDK, but still no avail.

Ouchthat's too much VB for me. I wouldn't know if your TCAS datatype matched my C structure at all. However you can check:

Please use the FSUIPC logging facilities to see the results of your endeavours. I'm sure you'll be able to figure it out from that -- use the IPC Read and Write logging options and the FSUIPC Log file will show you what your code results in across the interface.

And then I try reading the offset above and it still doesnt work

Well, the documentation does explicitly say that you cannot read back what you write there, doesn't it. ;-). Also, don't forget that the target is eraed if you don't keep replenishing in within 8 seconds -- use a 2 or 3 second time at most to be safe.

Regards,

Pete

[craig1231]

OK thanks Pete that now works adding the &, but another problem has occured :?

When I read the offset F096 (Aircraft ID) it returns ???4. '4' being the last character in the callsign SKY2304, any suggestions?? :D

Thanks

Craig

[Pete Dowson]

When I read the offset F096 (Aircraft ID) it returns ???4. '4' being the last character in the callsign SKY2304, any suggestions?? :D

Yes. Use FSUIPC logging, PLEASE? I cannot debug your program step by step. I don't even know VB and you've shown none this time in any case.

You need to do your own debugging. It is part of the joy of programming. There are enough tools around surely. Apart from the Logging, there's FSInterrogate where you can look at every byte, and surely VB must have a debugger?

Offhand I have no idea what "F096" should be in any case. The TCAS tables contain an array of structures. Treat them like that.

Regards,

Pete