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Question and Data Structure Summary

S

sandwind

Messages
15
Country
china
Hi everybody:

I had seriously read the manual of SDK, I found that the use of the Message cycle on data collection.

There are 16 kinds of data structures

as follow:

SIMCONNECT_RECV_OPEN structure.

SIMCONNECT_RECV_EVENT structure.

SIMCONNECT_RECV_EVENT_FILENAME structure.

SIMCONNECT_RECV_EVENT_OBJECT_ADDREMOVE structure.

SIMCONNECT_RECV_EVENT_FRAME structure.

SIMCONNECT_RECV_SIMOBJECT_DATA structure.

SIMCONNECT_RECV_SIMOBJECT_DATA_BYTYPE structure.

SIMCONNECT_RECV_EXCEPTION structure.

SIMCONNECT_RECV_WEATHER_OBSERVATION structure.

....

So different Message of data to different data structures.

In the sample of SDK, it call SimConnect_CallDispatch in circular loop for data your desired .

I want to say whetherthe corresponding to different data structures to obtain data after the event can be requested,Rather than call switch() in the circular loop.
:rolleyes:
 
Hello,

The structures are primarily used to map the data (I think of them as a C type union really) to make some sense of the bits returned by SimConnect where one pointer fits all, thus needs to be cast to the right data structure to be usable, hence the case statement. Case statements are typically pretty efficient if they can use a lookup table. The mapping only occurs in the receive event, because simconnect is asynchronous in nature so you can't readily make a call, and get the data back immediately when the call returns. You can fake this with threading of course to make it a sort of synchronous, yet that perhaps defeats the purpose.

The data model is that of event driven, so you make the request, and at some point, and in another part of your code, you get a response or an error.

Can you clarify the problem/question?

Thanks,

Etienne
 
Last edited:
Thank you very much for your help,Etienne

I understood the how simconnect was running.It's Similar to the establishment of a memory-mapped between client and server.

I had developped a progam to record data (exam: alitude,longitude,latitude,pitch,bank ...ect.)in dat file:cool:
 
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