Qt jsoncpp 对象拷贝、删除、函数调用 demo

/*****************************************************************************************************
*                       Qt jsoncpp 对象拷贝、删除、函数调用 demo
* 声明：
*     本程序主要就是为了验证jsoncpp中Json::Value对象中的append、等号赋值是拷贝内容，还是赋值指针，
* 就测试而言，从目前的情况来看应该是拷贝内容，代码得以验证。
*
*                                              2015-11-15 晴 深圳 南山平山村  曾剑锋
****************************************************************************************************/

/**
* 参考文档：
*    1. JsonCpp ambiguous overload only in Windows
*        http://stackoverflow.com/questions/18901781/jsoncpp-ambiguous-overload-only-in-windows *    2. QT 使用jsoncpp
*        http://www.cnblogs.com/foxhengxing/archive/2011/12/02/2272020.html *    3. Using JsonCpp and Qt Together (Problems with Unicode)
*        http://stackoverflow.com/questions/4191528/using-jsoncpp-and-qt-together-problems-with-unicode *    4. ambiguous overload for 'operator[]'
*        http://www.gamedev.net/topic/618752-ambiguous-overload-for-operator/ *    5. 一个C++编译错误
*        http://blog.chinaunix.net/uid-7865778-id-2038882.html */

#include <QCoreApplication>
#include "json/json.h"
#include <QString>
#include <QFile>
#include <QDebug>

#define ICON_PATH   "apps\/images\/"
#define SHELL_PATH  "\/usr\/share\/web\/lighttpd\/webpages\/shell\/"
#define JSON_FILE   "F:\/QT\/json.txt"

void jsonUpdateApp(Json::Value *programs, int index, QString icon, QString exec) {

// 名字相同了，自然不需要再重新赋值了
//(*programs)[index]["Name"]   = name.toStdString();
(*programs)[index]["Icon"]     = QString(ICON_PATH).append(icon).toStdString();
(*programs)[index]["Exec"]     = QString(SHELL_PATH) .append(exec).append(".sh").toStdString();

}

void jsonAddApp(Json::Value *programs, QString name, QString icon, QString exec) {

// 合成新的数据并加入json对象中
Json::Value item;
item["Name"]                = name.toStdString();
item["Order"]               = 999;
item["Icon"]                = QString(ICON_PATH).append(icon).toStdString();
item["Type"]                = "application";
item["Exec"]                = QString(SHELL_PATH).append(exec).append(".sh").toStdString();
item["ProgramType"]         = "gui";
item["Description_Link"]    = -1;
item["Lock"]                = -1;

programs->append(item);

}

void copyItem(Json::Value *programs, Json::Value *newPrograms, int index) {

// 合成新的数据并加入json对象中
Json::Value newItem;
newItem["Name"]                 = (*programs)[index]["Name"];
newItem["Order"]                = (*programs)[index]["Order"];
newItem["Icon"]                 = (*programs)[index]["Icon"];
newItem["Type"]                 = (*programs)[index]["Type"];
newItem["Exec"]                 = (*programs)[index]["Exec"];
newItem["ProgramType"]          = (*programs)[index]["ProgramType"];
newItem["Description_Link"]     = (*programs)[index]["Description_Link"];
newItem["Lock"]                 = (*programs)[index]["Lock"];

newPrograms->append(newItem);

}

bool checkAndAddUpdateAppByName(Json::Value *oldRoot, Json::Value *newRoot, QString name,
QString icon, QString exec) {

bool ret             = false;
Json::Value programs = ((*oldRoot)["main_menu"])["apps"];
Json::Value newPrograms;

int i = 0;
for ( i = 0; i < programs.size(); i++ ) {

// 如果有name对应的app，那么就对app进行更新
if ( QString::fromStdString(programs[i]["Name"].asString()).trimmed().compare(name.trimmed()) == 0 ) {
jsonUpdateApp(&programs, i, icon, exec);
ret = true;
}

copyItem(&programs, &newPrograms, i);
}

// 如果name没有重复的，那么添加一个这个app
if ( i >= programs.size() )
jsonAddApp(&newPrograms, name, icon, exec);

Json::Value newApps;
newApps["apps"]         = newPrograms;
(*newRoot)["main_menu"] = newApps;

return ret;
}

bool checkAndRemoveAppName(Json::Value *oldRoot, Json::Value *newRoot, QString name) {

bool ret             = false;
Json::Value programs = ((*oldRoot)["main_menu"])["apps"];
Json::Value newPrograms;

int i = 0;
for ( i = 0; i < programs.size(); i++ ) {

if ( QString::fromStdString(programs[i]["Name"].asString()).trimmed().compare(name.trimmed()) == 0 ) {
ret = true;
continue;
}

/*
* // 合成新的数据并加入json对象中
* Json::Value newItem;
* newItem["Name"]                = programs[i]["Name"];
* newItem["Order"]               = programs[i]["Order"];
* newItem["Icon"]                = programs[i]["Icon"];
* newItem["Type"]                = programs[i]["Type"];
* newItem["Exec"]                = programs[i]["Exec"];
* newItem["ProgramType"]         = programs[i]["ProgramType"];
* newItem["Description_Link"]    = programs[i]["Description_Link"];
* newItem["Lock"]                = programs[i]["Lock"];
*
* newPrograms.append(newItem);
*
* 下面这个函数是从上面的代码中重构出来的
*/
copyItem(&programs, &newPrograms, i);
}

Json::Value newApps;
newApps["apps"]         = newPrograms;
(*newRoot)["main_menu"] = newApps;

return ret;
}

int main(int argc, char *argv[])
{

QCoreApplication a(argc, argv);

// 检查文件是否存在
QFile jsonFileObject("F:/QT/json.txt");
if ( !jsonFileObject.exists() ) {
qDebug() << "Please check json.txt file already exist." << endl;
return -1;
}

// 打开并读取文件
QString jsonString;
if ( jsonFileObject.open(QIODevice::ReadOnly | QIODevice::Text) ) {
jsonString.append(jsonFileObject.readAll());
jsonFileObject.close();
} else {
qDebug() << "Open json file failt." << endl;
return -1;
}

// 解析json数据
Json::Value root;
Json::Reader reader;
bool parsingSuccessful = reader.parse(jsonString.toStdString(), root);
if ( !parsingSuccessful ) {
qDebug() << "Failed to parse configure.\n ";
return -1;
}

// 测试获取json数据
Json::Value programs = root["main_menu"]["apps"];
qDebug() << "programs size: " << programs.size();
// 这里的获取数据数据索引后面一定要加一个小写的u，目前还不知道具体的原因
std::cout << "Exec: " << programs[0u]["Exec"].asString() << std::endl;

Json::Value outRootWithRemove;
checkAndRemoveAppName(&root, &outRootWithRemove, "Network");
Json::Value outRootWithRemoveAndAdd;
checkAndAddUpdateAppByName(&outRootWithRemove, &outRootWithRemoveAndAdd, "zengjf", "zengjf", "zengjf");

// 生成写入文件的字符串
Json::StyledWriter writer;
std::string outputJsonstring = writer.write(outRootWithRemoveAndAdd);

// 将输出字符串输出到console上查看效果
std::cout << outputJsonstring << std::endl;

// 如果仅仅是测试，不需要写入文件，省的每次还要去换json.txt文件
if ( jsonFileObject.open(QIODevice::WriteOnly | QIODevice::Text) ) {
jsonFileObject.write(outputJsonstring.data());
jsonFileObject.close();
} else {
qDebug() << "Open json file failt." << endl;
return -1;
}

return a.exec();
}

/**
* json.txt
* {
*    "main_menu" : {
*       "apps" : [
*          {
*             "Description_Link" : -1,
*             "Exec" : "/usr/share/web/lighttpd/webpages/shell/browser.sh http://processors.wiki.ti.com", *             "Icon" : "apps/images/web-icon.png",
*             "Lock" : -1,
*             "Name" : "Browser",
*             "Order" : 999,
*             "ProgramType" : "gui",
*             "Type" : "application"
*          },
*          {
*             "Description_Link" : -1,
*             "Exec" : "/usr/share/web/lighttpd/webpages/shell/network.sh",
*             "Icon" : "apps/images/network-icon.png",
*             "Lock" : -1,
*             "Name" : "Network",
*             "Order" : 999,
*             "ProgramType" : "gui",
*             "Type" : "application"
*          }
*     ]
* }
*/

/**
* 输出结果：
* json.txt
* {
*    "main_menu" : {
*       "apps" : [
*          {
*             "Description_Link" : -1,
*             "Exec" : "/usr/share/web/lighttpd/webpages/shell/browser.sh http://processors.wiki.ti.com", *             "Icon" : "apps/images/web-icon.png",
*             "Lock" : -1,
*             "Name" : "Browser",
*             "Order" : 999,
*             "ProgramType" : "gui",
*             "Type" : "application"
*          },
*          {
*             "Description_Link" : -1,
*             "Exec" : "/usr/share/web/lighttpd/webpages/shell/zengjf.sh",
*             "Icon" : "apps/images/zengjf",
*             "Lock" : -1,
*             "Name" : "zengjf",
*             "Order" : 999,
*             "ProgramType" : "gui",
*             "Type" : "application"
*          }
*     ]
* }
*/