讀取config.yaml文件中參數內容,並賦值給程序中相關參數。
如果不存在key,會報錯:
terminate called after throwing an instance of 'YAML::TypedBadConversion<int>'
what(): yaml-cpp: error at line 0, column 0: bad conversion
已放棄 (核心已轉儲)
示例:
yaml_test.cpp
#include <iostream>
#include "yaml-cpp/yaml.h"
#include <fstream>
using namespace std;
typedef struct
{
int cpp;
int java;
int android;
int python;
}Skills;
typedef struct
{
string name;
string sex;
int age;
Skills skills;
} Config;
int test_base()
{
YAML::Node config;
try{
config = YAML::LoadFile("../config.yaml");
}catch(YAML::BadFile &e){
std::cout<<"read error!"<<std::endl;
return -1;
}
cout << "Node type " << config.Type() << endl;
cout << "skills type " << config["skills"].Type() << endl;
//可以用string類型作爲下表,讀取參數
string age = "age";
cout << "age when string is label:" << config[age].as<int>() << endl;
cout << "name:" << config["name"].as<string>() << endl;
cout << "sex:" << config["sex"].as<string>() << endl;
cout << "age:" << config["age"].as<int>() << endl;
//讀取不存在的node值,報YAML::TypedBadConversion異常
try{
string label = config["label"].as<string>();
}catch(YAML::TypedBadConversion<string> &e){
std::cout<<"label node is NULL"<<std::endl;
}//TypedBadConversion是模板類,讀取什麼類型的參數就傳入什麼類型
cout << "skills cpp:" << config["skills"]["cpp"].as<int>() << endl;
cout << "skills java:" << config["skills"]["java"].as<int>() << endl;
cout << "skills android:" << config["skills"]["android"].as<int>() << endl;
cout << "skills python:" << config["skills"]["python"].as<int>() << endl;
for(YAML::const_iterator it= config["skills"].begin(); it != config["skills"].end();++it)
{
cout << it->first.as<string>() << ":" << it->second.as<int>() << endl;
}
YAML::Node test1 = YAML::Load("[1,2,3,4]");
cout << " Type: " << test1.Type() << endl;
YAML::Node test2 = YAML::Load("1");
cout << " Type: " << test2.Type() << endl;
YAML::Node test3 = YAML::Load("{'id':1,'degree':'senior'}");
cout << " Type: " << test3.Type() << endl;
ofstream fout("./testconfig.yaml"); //保存config爲yaml文件
config["score"] = 99;//添加新元素
fout << config;
fout.close();
return 0;
}
int use_yaml_config()
{
YAML::Node config;
try{
config = YAML::LoadFile("../config.yaml");
}catch(YAML::BadFile &e){
std::cout<<"read error!"<<std::endl;
return -1;
}
Config param;
//提取, 賦值
param.age = config["age"].as<int>();
param.name = config["name"].as<string>();
param.sex = config["sex"].as<string>();
param.skills.android = config["skills"]["android"].as<int>();
param.skills.java = config["skills"]["java"].as<int>();
param.skills.python = config["skills"]["python"].as<int>();
param.skills.cpp = config["skills"]["cpp"].as<int>();
//查看結果
cout<< " param.age = "<<param.age <<endl;
cout<< " param.name = "<<param.name <<endl;
cout<< " param.sex = "<<param.sex <<endl;
cout<< "param.skills.android = "<<param.skills.android <<endl;
cout<< " param.skills.java = "<<param.skills.java <<endl;
cout<< " param.skills.python = "<<param.skills.python <<endl;
cout<< " param.skills.cpp = "<<param.skills.cpp <<endl;
return 0;
}
int main(int argc,char** argv)
{
use_yaml_config();
return 0;
}
config.yaml
name: frank
sex: male
age: 18
skills:
cpp: 1
java: 2
android: 3
python: 4
CMakeLists.txt 配置
cmake_minimum_required(VERSION 3.2)
project(yaml_test)
add_definitions(-std=c++11)
if(NEW_YAMLCPP_FOUND)
add_definitions(-DHAVE_NEW_YAMLCPP)
endif(NEW_YAMLCPP_FOUND)
link_directories(
/usr/lib/
)
include_directories(
include
yaml-cpp
)
set(SRCS ./src/yaml_test.cpp)
add_executable(yamltest ${SRCS})
target_link_libraries(yamltest ${catkin_LIBRARIES} yaml-cpp)
執行結果:
yuan@linx-c:~/VSCode/CPP_Learning/yaml/yaml_test/build$ ./yamltest
param.age = 18
param.name = frank
param.sex = male
param.skills.android = 3
param.skills.java = 2
param.skills.python = 4
param.skills.cpp = 1
參考:
C++ 解析yaml文件的使用方法 https://blog.csdn.net/sunlin972913894/article/details/103038082
c++ 開發中利用yaml-cpp讀寫yaml配置文件 https://blog.csdn.net/briblue/article/details/89515470