Download file as stream

Download file as stream.

C++ example

#include <iostream>
#include <memory>
#include <istream>
#include <fstream>

#include "independentsoft/graph/graph_client.hpp"
#include "independentsoft/graph/graph_exception.hpp"
#include "independentsoft/graph/files/drive_id.hpp"

using namespace independentsoft::graph;
using namespace independentsoft::graph::files;

int main()
{
    try
    {
        GraphClient client;

        client.client_id = "63333333-209e-454e-b7bd-55a4d201270f";
        client.tenant = "independentsoft.onmicrosoft.com";
        client.client_secret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

        std::shared_ptr<std::istream> inputStream = sync_wait(client.get_drive_item_as_stream("/Folder1/Test.pdf", DriveId("b!T7ZW_FMzJ02x_G6HteZHZ")));

        std::ofstream outputStream("e:\\Test-download.pdf", std::ios::out | std::ios::binary);

        char buffer[1024];
        inputStream->read(buffer, sizeof(buffer));
        std::streamsize bytesRead = inputStream->gcount();

        while (bytesRead > 0)
        {
            outputStream.write(buffer, bytesRead);

            inputStream->read(buffer, sizeof(buffer));
            bytesRead = inputStream->gcount();
        }
    }
    catch (const GraphException& ex)
    {
        std::cout << "Error: " << ex.code << std::endl;
        std::cout << "Message: " << ex.message << std::endl;
    }

    return 0;
}

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