Need help understanding setDataOnSimObject()

[yourcptainspeaking]

I'm trying to use this function to set lvars using the setDataOnSimObject() method but I keep getting a SIMCONNECT_EXCEPTION_INVALID_DATA_SIZE error. Any idea what I'm doing wrong and how to fix this? Thanks!

public setLVar(name: string, value: number, units: string): void {
	const definitionId = this.generateDefId(2000)

	this.api.handle.addToDataDefinition(
		definitionId,
		`L:${name}`,
		units,
		SimConnectDataType.FLOAT64
	)

	const dataToSet = new RawBuffer(4)
	dataToSet.writeInt32(value)
	this.api.handle.setDataOnSimObject(
		definitionId,
		SimConnectConstants.OBJECT_ID_USER,
		{
			buffer: dataToSet,
			arrayCount: 0,
			tagged: false
		}
	)
}

[EvenAR]

Hi! I see you specify FLOAT64 (8 bytes) in the data definition, but when writing to the rawbuffer you use writeInt32 (4 bytes). This will cause a size mismatch between the RawBuffer and the data definition, which could be related to the exception you are getting. Try replacing it with writeFloat64 (or alternatively use INT32 in the data definition).

[yourcptainspeaking]

Thanks, this worked great! Pretty sure I was thinking of the "L variables are only FLOAT64." note on the SDK docs when I wrote the data definition but forgot about it when doing the buffer. On an unrelated note, is it currently possible to see what specific request caused a simconnect exception?

[EvenAR]

Great! 🎉

On an unrelated note, is it currently possible to see what specific request caused a simconnect exception?

Yes, it's possible. All SDK function calls returns a send id, and whenever you receive an exception this ID is included in the payload (sendId) so you can tell which exact function call that caused the error.

[yourcptainspeaking]

Perfect, thanks!