概述

文件可以存储任何非结构化字节序列，这个比较简单，就一个写一个读；学习到此，留个记录，以后可以直接抄代码，哈哈

Demo代码

#include <fstream>
#include <iostream>
#include <thread>
#include <vector>#include <unistd.h>std::string kSharedFile = "/tmp/test.bin";template<class T>
class Writer {private:std::ofstream out;public:Writer(std::string& name):out(name, std::ofstream::binary) {}void Write(const T& data) {out.write(reinterpret_cast<const char*>(&data), sizeof(T));}
};template<class T>
class Reader {private:std::ifstream in;public:Reader(std::string& name) {for(int count=10; count && !in.is_open(); count--) {in.open(name, std::ifstream::binary);std::this_thread::sleep_for(std::chrono::milliseconds(10));}}T Read() {int count = 10;for (;count && in.eof(); count--) {std::this_thread::sleep_for(std::chrono::milliseconds(10));}T data;in.read(reinterpret_cast<char*>(&data), sizeof(data));if (!in) {throw std::runtime_error("Failed to read a message");}return data;}
};struct Message {int x, y;
};std::ostream& operator<<(std::ostream& o, const Message& m) {o << "(x=" << m.x << ", y=" << m.y << ")";
}void DoWrites() {std::vector<Message> messages {{1, 0}, {0, 1}, {1, 1}, {0, 0}};Writer<Message> writer(kSharedFile);for (const auto& m : messages) { std::cout << "Write " << m << std::endl;writer.Write(m);}
}void DoReads() {Reader<Message> reader(kSharedFile);try {while(true) {std::cout << "Read " << reader.Read() << std::endl;}} catch (const std::runtime_error& e) {std::cout << e.what() << std::endl;}
}int main(int argc, char** argv) {if (fork()) {DoWrites();} else {DoReads();}
}

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