binary_reader3.cpp

Show how to use xtd::io::binary_reader class.

#include <xtd/xtd>

using namespace std;
using namespace xtd;
using namespace xtd::io;

class program {
  inline static const ustring file_name = "app_settings.dat";
public:
  static auto main() {
    write_default_values();
    display_values();
  }
  
  static void write_default_values() {
    using_(fstream fs = file::open(file_name, ios::out | ios::binary | ios::trunc)) {
      binary_writer writer(fs);
      writer << 1.250F;
      writer << R"(c:\Temp)";
      writer << 10;
      writer << true;
    }
  }
  
  static void display_values() {
    float aspect1, aspect2;
    ustring temp_directory;
    int auto_save_time;
    bool show_status_bar;
    
    if (file::exists(file_name)) {
      using_(fstream fs = file::open(file_name, ios::in | ios::binary)) {
        binary_reader reader(fs);
        reader >> aspect1;
        reader >> temp_directory;
        console::write_line("Pushing current position: {}", reader.tellg());
        reader.push();
        console::write_line("Rewinding position to: {}", std::ios_base::beg);
        reader.rewind();
        reader >> aspect2;
        console::write_line("Restoring position to: {}", reader.pop());
        reader >> auto_save_time;
        reader >> show_status_bar;
      }
      
      if(aspect1 != aspect2)
        console::write_line("Reader stack aspect ratio mismatch: {} != {}", aspect1, aspect2);
      else
        console::write_line("Aspect ratios set to: {} == {}", aspect1, aspect2);
      
      console::write_line("Temp directory is: {}", temp_directory);
      console::write_line("Auto save time set to: {}", auto_save_time);
      console::write_line("Show status bar: {}", show_status_bar);
    }
  }
};

startup_(program);

// This code produces the following output :
//
// Pushing current position: 15
// Rewinding position to: 0
// Restoring position to: 15
// Aspect ratios set to: 1.25 == 1.25
// Temp directory is: c:\Temp
// Auto save time set to: 10
// Show status bar: true