Problem with reading OFFSET 0x07D4!

[aband]

Got Problem to read the Autopilot altitude !

my envioroment:VS2008 FSX FSUIPCV4.2

the Autopilot altitude value explained in the manual:FSUIPC4 Offsets Status.pdf

07D4 4 Autopilot altitude value, as metres*65536 Ok Ok

in my project

I declare a struct:

struct AUTOPILOT

{

int Status[6];

UINT uHDG;//heading

TCHAR szHDG[256];

DWORD dwALT;//altitude

TCHAR szALT[256];

UINT uAS;//air speed

TCHAR szAS[256];

long lVS;//vertical speed

TCHAR szVS[256];

}AP;

and I use the following function to get the value of AP' altitude:

if (!FSUIPC_Read(0x07D4,2, &AP.dwALT, &dwResult) ||

// If we wanted other reads/writes at the same time, we could put them here

!FSUIPC_Process(&dwResult)) // Process the request(s)

{

SetDlgItemText(hwnd,IDC_EDIT_AP_ALT,TEXT("FAIL"));

}

else

{

wsprintf(AP.szALT,TEXT("%05d"),AP.dwALT/65536);

SetDlgItemText(hwnd,IDC_EDIT_AP_ALT,AP.szALT);

}

but the AP.szALT always get the "00000"

I make a break point on the "else" line,and check the value of the AP.dwALT in the debug mode,which I read in the offset 0x07D4.

It's so weird,when the AP altitude valued in the FSX is 100,I got 31457(decimal system) from the AP.dwALT,more showed below:

FSX AP.szALT (decimal system)

0 00000

100 31457

200 32915

300 28836

1000 52428

99900 34048

I dont know what is going wrong with my code and very confuse about this. :oops:

Very appreciate if somebody Colud help me!

[aband]

07D4 4 Autopilot altitude value, as metres*65536 Ok Ok

offset 07D4 is 4byte value,I dont know how can I miss this!

Stay up late to work is not wise. :mrgreen:

here is the right function:

if (!FSUIPC_Read(0x07D4,4, &AP.dwALT, &dwResult) ||
// If we wanted other reads/writes at the same time, we could put them here
!FSUIPC_Process(&dwResult)) // Process the request(s)
{
SetDlgItemText(hwnd,IDC_EDIT_AP_ALT,TEXT("FAIL"));
}
else
{
wsprintf(AP.szALT,TEXT("%05d"),AP.dwALT/65536);
SetDlgItemText(hwnd,IDC_EDIT_AP_ALT,AP.szALT);
}

[Andydigital]

my environment:VS2008 FSX FSUIPCV4.2

I hope FSUIPC 4.2 is a typo, if it's not then you are about 3 years out of date. Pete is away till Monday but I can tell you now he wont offer support to anyone using software that is 3 years out of date. Please see the post below to get the latest version of FSUIPC, you will need to download the 4.6 installer first then apply the interim update afterwards if you wish.

http://forums.simflight.com/viewtopic.php?f=54&t=74352

I'm glad you sorted your problem out though :D