(十) yaml-cpp编译和使用

1、版本选择

建议使用yaml-cpp-0.6.0这个版本。它有以下特点：

1）只需要c++11

2）去掉对boost等其他的依赖，干净

下载链接：https://github.com/jbeder/yaml-cpp/releases/tag/yaml-cpp-0.6.0

2、编译和安装

将yaml-cpp装在指定目录下，工程下有cmakelists.txt文件，新建build，然后cmake

在x86平台：

cmake .. -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=/gzy_mnt/YAML_X86

而使用交叉编译工具进行编译arm链接库

cmake .. -DBUILD_SHARED_LIBS=ON \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_SYSTEM_NAME=Linux \
         -DCMAKE_SYSTEM_VERSION=1 \
         -DCMAKE_SYSTEM_PROCESSOR=aarch64 \
         -DCMAKE_C_COMPILER=/gzy_mnt/aarch64-linux-gds/bin/aarch64-linux-gnu-gcc \
       -DCMAKE_CXX_COMPILER=/gzy_mnt/aarch64-linux-gds/bin/aarch64-linux-gnu-g++ \
         -DCMAKE_INSTALL_PREFIX=/gzy_mnt/YAML_ARM

再make

make -j8

再安装

make install

这样将yaml-cpp安装在指定环境下

3、demo使用

1）config.yaml配置如何

custom_db:
    db_domain: 10.0.0.8
    db_username: root
    db_passwd: my_passwd
    db_schema: test

redis:
    redis_domain: 10.0.0.10
    redis_passwd: 123456

hello:
    num_config: [1141studio]
    name_config: [powered, by, 1141studio]

2）config_test.cpp

#include <iostream>
#include <string>
#include <stdio.h>
#include <unistd.h>
#include "yaml-cpp/yaml.h"
#include <vector>
const std::string DB_CONF = "config.yaml";
int main(int argc, char * argv[]) {
    /*----------------------------------- test yaml ----------------------------------------*/
    printf("hello world\n");
    std::cout << "this code is only for test yaml" << std::endl;

    /* Node conf. */
    YAML::Node conf = YAML::LoadFile(DB_CONF);
    
    /*----------------------------------- display db_config ----------------------------------------*/
    std::cout << "Database:"<< std::endl;
    std::cout << "domain:  " << conf["custom_db"]["db_domain"].as<std::string>() << std::endl;
    std::cout << "username:" << conf["custom_db"]["db_username"].as<std::string>() << std::endl;
    std::cout << "passwd:  " << conf["custom_db"]["db_passwd"].as<std::string>() << std::endl;
    std::cout << "schema:  " << conf["custom_db"]["db_schema"].as<std::string>() << std::endl;

    /*----------------------------------- display redis ----------------------------------------*/
    std::cout << "Redis" << std::endl;
    std::cout << "redis_domain: " << conf["redis"]["redis_domain"].as<std::string>() << std::endl;
    std::cout << "redis_passwd: " << conf["redis"]["redis_passwd"].as<std::string>() << std::endl;
    
    /*----------------------------------- display hello ----------------------------------------*/
    std::cout << "HelloServer" << std::endl;
    
    /* vector of name string. */
    std::vector<std::string> name_vec = conf["hello"]["num_config"].as<std::vector<std::string> >();
    if(!name_vec.empty())
      std::cout << name_vec[0] << std::endl;
    return 0;
}

3)CMakeLists.txt配置情况如下

cmake_minimum_required(VERSION 3.5.1)
project(nanodet-mnn)
SET(CMAKE_BUILD_TYPE "Release")

SET(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall")
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/)

# yaml-cpp的包含目录
include_directories("/gzy_mnt/YAML_X86/include")
file(GLOB SOURCE_FILES *.cpp)
add_executable(${CMAKE_PROJECT_NAME} ${SOURCE_FILES})

target_link_libraries (
        ${CMAKE_PROJECT_NAME}   
        pthread
        /gzy_mnt/YAML_X86/lib/libyaml-cpp.so
)