我需要使用 QT 在 C++ 中编辑我的解析器代码。我受到某人的启发。我遇到了一个问题,他只解析了我的 .json 文件的一半。
这是我的代码:
#include <QJsonArray>
#include "mainwindow.h"
#include <QApplication>
#include <stdio.h>
#include <QPushButton>
#include <QFile>
#include <QDebug>
#include <QJsonDocument>
#include <QJsonObject>
#include <QTranslator>
#include "parcer_js.h"
#include <iostream>
#include <QList>
#include <QString>
#include <string>
#include <parcer_js.h>
#include <Mail.hpp>
#include <QDate>
void Parcer::parcerJs()
{
QString val;
QFile file;
file.setFileName("jstest.json");
file.open(QIODevice::ReadOnly | QIODevice::Text);
val = file.readAll();
file.close();
QJsonDocument d = QJsonDocument::fromJson(val.toUtf8());
ParcerByfile(d);
}
void Parcer::ParcerByfile(QJsonDocument d)
{
QJsonObject sett2 = d.object();
qWarning() << sett2;
QJsonValue value = sett2.value(QString("123")); // Problem !!!
QJsonObject item = value.toObject();
QJsonValue subFrom = item["from"];
qWarning() << subFrom.toString();
QJsonArray strTo = item["to"].toArray();
qWarning() << strTo[0].toString();
qWarning() << strTo[1].toString();
}
这是 .json 代码:
{
"123": {
"from": "magellan.dunord@antarctica.com",
"to": [
"lol@hotmail.fr",
"pipo@antartica-base.com"
],
"cc": [
"johndoe@il2.fr",
"gordonfreeman@antarctica.com"
],
"cci": [
"missepitech@antarctica.com"
],
"obj": "trolol > all",
"contenu": "Hello 3301 Word ! !",
"date": "21-1-1993",
"domaine": "antartica-base.com",
"state": "0",
"pseudo_f": "Jd"
},
"456": {
"from": "pipo@antarctica.com",
"to": [
"lol@hotmail.fr",
"pipo@antartica-base.com"
],
"cc": [
"johndoe@flavicon.fr",
"gordonfreeman@qwerty.fr"
],
"cci": [
"missepitech@antarctica.com"
],
"obj": "3301 > all",
"contenu": "Hello 3301 Word ! !",
"date": "21-12-1993",
"domaine": "antartica-base.com",
"state": "0",
"pseudo_f": "Jd"
}
}
问题出在这一行:
QJsonValue value = sett2.value(QString("123"));
我需要先找到这个“:{”后面的ID,然后我会创建一个系统
因为我的代码只解析 .json 文件中的“123”部分。 我想知道如何将“123”和“456”解析为项目或列表。因为通常我不知道 ID 是什么。
最佳答案
这可以通过获取所有键来完成,然后您可以在返回的 QStringList 上使用第一个方法。
有关详细信息,请参阅 documentation。
因此,你会写这样的东西:
QJsonValue value = sett2.value(sett2.keys().first()); // NO Problem !!!
您可能会使用 begin iterator 以及以下内容:
QJsonValue value = sett2.begin().value();
这里是完整的示例项目以供引用:
主.json
{
"123": {
"from": "magellan.dunord@antartica-base.com",
"to": [
"lol@hotmail.fr",
"pipo@antartica-base.com"
],
"cc": [
"johndoe@antartica-base.com",
"gordonfreeman@antartica-base.com"
],
"cci": [
"missepitech@antartica-base.com"
],
"obj": "EpiMTP2017 > all",
"contenu": "Hello 3301 Word ! !",
"date": "21-12-1993",
"domaine": "antartica-base.com",
"state": "0",
"pseudo_f": "Jd"
},
"456": {
"from": "laray.croft@antartica-base.com",
"to": [
"lol@hotmail.fr",
"pipo@antartica-base.com"
],
"cc": [
"johndoe@antartica-base.com",
"gordonfreeman@antartica-base.com"
],
"cci": [
"missepitech@antartica-base.com"
],
"obj": "EpiMTP2017 > all",
"contenu": "Hello 3301 Word ! !",
"date": "21-12-1993",
"domaine": "antartica-base.com",
"state": "0",
"pseudo_f": "Jd"
}
}
主程序
TEMPLATE = app
TARGET = main
QT = core
SOURCES += main.cpp
main.cpp
#include <QFile>
#include <QByteArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QDebug>
int main()
{
QFile file("main.json");
file.open(QIODevice::ReadOnly | QIODevice::Text);
QByteArray jsonData = file.readAll();
file.close();
QJsonDocument d = QJsonDocument::fromJson(jsonData);
QJsonObject sett2 = d.object();
QJsonValue value = sett2.begin().value();
QJsonValue value2 = sett2.value(sett2.keys().first());
qDebug() << value;
qDebug() << " =========== ";
qDebug() << value2;
return 0;
}
构建并运行
qmake && make && ./main
输出
QJsonValue(object, QJsonObject({"cc": ["johndoe@antartica-base.com","gordonfreeman@antartica-base.com"],"cci": ["missepitech@antartica-base.com"],"contenu": "Hello 3301 Word ! !","date": "21-12-1993","domaine": "antartica-base.com","from": "magellan.dunord@antartica-base.com","obj": "EpiMTP2017 > all","pseudo_f": "Jd","state": "0","to": ["lol@hotmail.fr","pipo@antartica-base.com"]}) )
===========
QJsonValue(object, QJsonObject({"cc": ["johndoe@antartica-base.com","gordonfreeman@antartica-base.com"],"cci": ["missepitech@antartica-base.com"],"contenu": "Hello 3301 Word ! !","date": "21-12-1993","domaine": "antartica-base.com","from": "magellan.dunord@antartica-base.com","obj": "EpiMTP2017 > all","pseudo_f": "Jd","state": "0","to": ["lol@hotmail.fr","pipo@antartica-base.com"]}) )
关于c++ - QT 中的 json 解析器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22273734/