From 7033314f386778b42bc4e0c388d07252364e7ae3 Mon Sep 17 00:00:00 2001
From: daleclack <daleclack1@foxmail.com>
Date: Wed, 11 Aug 2021 10:45:11 +0800
Subject: [PATCH] Add cfgfile2

---
 cpp/cfgfile2.cpp | 158 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 cpp/cfgfile2.cpp

diff --git a/cpp/cfgfile2.cpp b/cpp/cfgfile2.cpp
new file mode 100644
index 0000000..09f2b30
--- /dev/null
+++ b/cpp/cfgfile2.cpp
@@ -0,0 +1,158 @@
+// A Test to read Config files
+// This is a modified version
+// The Config File Should be a text file 
+// and the content as follows
+// key=value
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <map>
+
+typedef void (*pfun)();//The Function Pointer
+typedef std::map<std::string,std::string> conf_map;//Container of configs
+
+void Trim(std::string &str){
+    if(str.empty()){//String is empty
+        return;
+    }
+    int i;
+    size_t start_pos,end_pos;
+
+    for(i=0;i<str.size();i++){//Get Start Position
+        if(!isspace(str[i])){
+            break;
+        }
+    }
+
+    if(i==str.size()){//Only Space and Tabs in string
+        return;
+    }
+
+    start_pos=i;
+
+    for(i=str.size()-1;i>=0;i--){//Get End Position
+        if(!isspace(str[i])){
+            break;
+        }
+    }
+
+    end_pos=i;
+
+    str=str.substr(start_pos,end_pos+1);
+}
+
+bool readCfgFile(const char * cfgfilePath,conf_map &configs){
+    //Open The Config File and load config to map
+    std::fstream cfgfile;
+    cfgfile.open(cfgfilePath);
+    if(!cfgfile.is_open()){
+        std::cout<<"Failed to open the file!"<<std::endl;
+        return false;
+    }
+
+    //If Map is not empty,clear it
+    if(!configs.empty()){
+        configs.clear();
+    }
+
+    //Read each line of config file and get value
+    char tmp[1000];
+    while(!cfgfile.eof()){
+        cfgfile.getline(tmp,1000);
+        std::string line(tmp),value;
+        std::size_t pos = line.find('=');//Get the position of '='
+
+        if(pos == std::string::npos){//No Configs
+            continue;
+        }
+
+        std::string key=line.substr(0,pos);
+        value=line.substr(pos+1);
+
+        //Clear Spaces
+        Trim(key);Trim(value);
+
+        configs[key]=value;
+    }
+
+    cfgfile.close();
+    return true;
+}
+
+void readcfg(){
+    //Input Config File Path and Key
+    char filename[1000];
+    std::string cfgkey;
+    conf_map test_config;
+
+    std::cout<<"Input Config File Name:";//Config File Name
+    std::cin.get();//Clear the cin to read line
+    std::cin.getline(filename,1000);
+
+    std::cout<<"Input Config Key:";//Config Key
+    std::cin>>cfgkey;
+
+    //Get The Config
+    if(readCfgFile(filename,test_config)){
+        std::cout<<"The Config Of "<<cfgkey<<" is "<<test_config[cfgkey]<<std::endl;
+    }else{
+        std::cout<<"Failed to Read Config!"<<std::endl;
+    }
+}
+
+void appendcfg(){
+    //Input Config File Path and Key
+    char filename[1000];
+    std::string cfgkey,cfgvalue;
+
+    std::cout<<"Input Config File Name:";
+    std::cin.get();//Clear the cin to read line
+    std::cin.getline(filename,1000);
+
+    //Append Config
+    std::fstream cfgfile;
+    cfgfile.open(filename,std::ios_base::app);
+
+    if(cfgfile.is_open()){
+        std::cout<<"Input Config Key And Config Value:";
+        std::cin>>cfgkey>>cfgvalue;
+        cfgfile<<std::endl;
+        cfgfile<<cfgkey<<"="<<cfgvalue;
+        cfgfile.close();
+    }else{
+        std::cout<<"Config File Open Failed!"<<std::endl;
+    }
+}
+
+void show_configs(){
+    //Input Config File Path and Key
+    char filename[1000];
+    conf_map test_config;
+
+    std::cout<<"Input Config File Name"<<std::endl;//Config File Name
+    std::cin.get();//Clear the cin to read line
+    std::cin.getline(filename,1000);
+
+    //Get The Config and Show all Config in map
+    if(readCfgFile(filename,test_config)){
+        auto mite=test_config.begin();
+        for(;mite!=test_config.end();mite++){
+            std::cout<<mite->first<<"="<<mite->second<<std::endl;
+        }
+        
+    }else{
+        std::cout<<"Failed to Read Config!"<<std::endl;
+    }
+}
+
+int main(int argc,char **argv){
+    //Function Pointer to select mode
+    pfun feature[]={readcfg,appendcfg,show_configs};
+    //Get Selection and execute a mode
+    int selection;
+    std::cout<<"0.Read a Config 1.Append a Config 2.Show all Configs"<<std::endl<<"Selection a mode:";
+    std::cin>>selection;
+    feature[selection]();
+    return 0;
+}