SDK Discussion: How to retrieve a string from SimConnect in C#?

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The solution I posted here works with strings, it may provide some assistance.

Below are snippets from that code, relevant to your problem.

I submit the initial request using:

    var unit = request.Unit;
    if (unit?.IndexOf("string") > -1)
    {
        unit = null;
    }
    // Fetch the values suitable for transmission to SimConnect
    var simReq = new SimVarRequest
    {
        ID = RequestID++,
        Request = request
    };
    // Submit the SimVar request to SimConnect
    simConnect.AddToDataDefinition(simReq.DefID, request.Name, unit, simReq.SimType, 0.0f, SimConnect.SIMCONNECT_UNUSED);

I submit the Data Structure using:

simConnect.RegisterDataDefineStruct<SimVarString>(simReq.DefID);

Finally, below is my model class for SimVarString above:

internal struct SimVarString
{
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
    public string Value;
}

Note: I have not declared the structure with [StructLayout…], only the [MarshalAs…] is required.

Hope this helps…

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