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error simconnect_open

D

DiscDur

Messages
2
hello,

I'm trying to open a conection with simconnect and when I use the instruction "simconnect_open", the system display an error called: "Declare DLL call caused an exception". Anybody knows what's happening?

firstly I defined the api function like:

Declare SimConnect_Open IN SimConnect.dll long phSimConnect , string szName , long hWnd , long UserEventWin32 , long hEventHandle , long ConfigIndex

and then I call the funtion with the next instruction:

hr = SimConnect_Open(hSimConnect, "MYAPP", 0, 0, 0, 0)

I'm programming in Visual FoxPro.

Can anybody help me?

Thank's
 
Now that is an interesting twist! Visual FoxPro - I haven't done that in years, but I still have a pair of mugs from Fox software before MS bought the company. I'm needless to say a bit rusty on the VFP language, and I'll give it a shot anyway :)

You may have a couple of problems:

The declaration of SimConnect_Open is this in C/C++:
HRESULT SimConnect_Open(
HANDLE* phSimConnect,
LPCSTR szName,
HWND hWnd,
DWORD UserEventWin32,
HANDLE hEventHandle,
DWORD ConfigIndex
);

Your declare statement should look more like this:

DECLARE INTEGER SimConnect_Open IN simconnect.dll INTEGER @ phSimConnect, STRING app, INTEGER handle, INTEGER eventID, INTEGER evenHandle, INTEGER index

The first parameter must be passed by reference to get the value back.

If you still get an error, make sure that VFP can find the DLL in the proper path.

Lastly, VFP is probably unicode these days, simconnect isn't - make sure the srings you send to the SimConnect API are single byte strings.

Hope this helps,

Etienne
 
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