57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
/*
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EXAMPLE osmium_read_with_progress
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Reads the contents of the input file showing a progress bar.
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DEMONSTRATES USE OF:
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* file input
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* ProgressBar utility function
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SIMPLER EXAMPLES you might want to understand first:
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* osmium_read
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LICENSE
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The code in this example file is released into the Public Domain.
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*/
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#include <cstdlib> // for std::exit
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#include <iostream> // for std::cerr
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// Allow any format of input files (XML, PBF, ...)
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#include <osmium/io/any_input.hpp>
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// Get access to isatty utility function and progress bar utility class.
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#include <osmium/util/file.hpp>
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#include <osmium/util/progress_bar.hpp>
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int main(int argc, char* argv[]) {
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if (argc != 2) {
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std::cerr << "Usage: " << argv[0] << " OSMFILE\n";
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std::exit(1);
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}
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// The Reader is initialized here with an osmium::io::File, but could
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// also be directly initialized with a file name.
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osmium::io::File input_file{argv[1]};
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osmium::io::Reader reader{input_file};
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// Initialize progress bar, enable it only if STDERR is a TTY.
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osmium::ProgressBar progress{reader.file_size(), osmium::util::isatty(2)};
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// OSM data comes in buffers, read until there are no more.
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while (osmium::memory::Buffer buffer = reader.read()) {
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// Update progress bar for each buffer.
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progress.update(reader.offset());
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}
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// Progress bar is done.
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progress.done();
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// You do not have to close the Reader explicitly, but because the
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// destructor can't throw, you will not see any errors otherwise.
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reader.close();
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}
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