Why no drawing in File I/O and Data Analysis?

[songshusen]

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ROOT Version: 6.28
Platform: windows 10
Compiler: visual studio 2022 C++

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Why no drawing in File I/O and Data Analysis?

my_rootfile.root (3.8 KB)
read_from_file.C (252 Bytes)
write_to_file.C (371 Bytes)

[bellenot]

    // Get the Histogram out
    auto h = in_file.Get<TH1F>("my_histogram");
    h->SetDirectory(0);
    // Draw it
    auto myCanvas = new TCanvas();
    h->Draw();