每日科技英文53: crow库(一个仿照python flask的C++ micro web framework)

1. demo

#include "crow.h"

int main()
{
    crow::SimpleApp app;

    CROW_ROUTE(app, "/")([](){
        return "Hello world";
    });

    app.port(18080).multithreaded().run();
}

很熟悉的代码吧，和python flask库如此相像！

2. crow简介:

Crow is very fast and easy to use C++ micro web framework (inspired by Python Flask)

3. 特点:

• Easy routing
  Similiar to Flask
  Type-safe Handlers

• Very Fast

  
  
  

  并发连接数.png

• You can also use json11 or rapidjson for better speed or readability

• Mustache based templating library (crow::mustache)【html模板引擎】

• Header only

• Provide an amalgamated header file crow_all.h with every features (Download from here )

• Middleware support

• Websocket support 【支持websocket】

4. 编译要求:

• C++ compiler with good C++11 support (tested with g++>=4.8)

• boost library【crow内部使用boost::asio异步文件流库】

• CMake for build examples

• Linking with tcmalloc/jemalloc is recommended for speed.【高效的c语言内存分配库，可以替换掉crt(c语言运行时)中的default实现】

• Now supporting VS2013 with limited functionality (only run-time check for url is available.)【vs2013属于阉割版的c++11实现编译器，因此请使用vs2015或更高版本来编译crow库】

CROW_ROUTE(app, "/add_json")
.methods("POST"_method)
([](const crow::request& req){
    auto x = crow::json::load(req.body);
    if (!x)
        return crow::response(400);
    int sum = x["a"].i()+x["b"].i();
    std::ostringstream os;
    os << sum;
    return crow::response{os.str()};
});

5. 我的应用:

树莓派、嵌入式及乐高机器人视频专辑v0.1
集合中的第一篇视频有演示和为什么使用crow原因