How to wait all packet are sent before StreamShutdown/Close

[ami-GS]

API doc said that StreamSend just enqueue data on stream and it is unblocking call.
How can the app wait the enqueued data to be sent before StreamShutdown/Close?

[ThadHouse]

You can call shutdown while there is still data in flight, as long as it's not an abortive shutdown. that will just shut down the send side, you can still receive data. Then you can wait for the ShutdownComplete callback, and close once you receive that.

[ami-GS]

My code example is bellow.
I experimented a bit. You are right, the data was sent as expected by putting sleep before MsQuic->ConnectionShutdown()
This means the data on stream was sent between MsQuic->StreamShutdown() and QUIC_STREAM_EVENT_SHUTDOWN_COMPLETE.
Problem should be come from ConnectionShutdown/Close before QUIC_STREAM_EVENT_SHUTDOWN_COMPLETE on the stream.
Should ConnectionShutdown called after QUIC_STREAM_EVENT_SHUTDOWN_COMPLETE?

void close(Stream, Connection, Configuration, Registration) {
    if (Stream) {
        MsQuic->StreamShutdown(Stream, QUIC_STREAM_SHUTDOWN_FLAG_GRACEFUL, 0);
    }

    //sleep(1);
    if (Connection) {
        MsQuic->ConnectionShutdown(Connection, QUIC_CONNECTION_SHUTDOWN_FLAG_NONE, 0);
    }

    if (Configuration) {
        MsQuic->ConfigurationClose(Configuration);
    }

    if (Registration) {
        MsQuic->RegistrationShutdown(Registration, QUIC_CONNECTION_SHUTDOWN_FLAG_NONE, 0);
    }
}

[ThadHouse]

Yes, you have to wait for the stream shutdown event to complete before calling ConnectionShutdown. ConnectionShutdown will implicitly close all streams. See the remarks docs for connection shutdown (https://github.com/microsoft/msquic/blob/main/docs/api/ConnectionShutdown.md) for a bit more info in this.