Sending AudioBuffer to server

I’ve been trying to send audio selected from the host to our server. For that my idea is to first convert buffer to file and then load it using flac_file.loadFileAsData() and send this over network.

juce::MemoryOutputStream memstream;
        juce::MemoryBlock memblock;
        juce::String flac = memstream.toString();

So here I am loading flac data to a memory block , now how do I convert it to memory Stream?
Or is there a more efficient/easier way to do this?