如何解析pusher.com的“序列化” json into qt5 QJsonDocument？ [英] How to parse pusher.com's "serialized" json into qt5 QJsonDocument?

问题描述

我从一个pusher.com WebSocket获取一些json数据在我的qt5应用程序，我正在努力解析他们发送的序列化json。我终于找到了问题，但我不知道如何解决它：

我做了一个小测试程序来演示：

  QString str1 ={\event\：\message\，\data\：\{\\\ \\\channel\\\：\\\trade.3 \\\，\\\trade\\\：{\ \\tradeid\\\：\\\86364698\\\，\\\timestamp\\\：1425420405，\ \\datetime\\\：\\\2015-03-03 17:06:45 EDT\\\，\\\marketid\ \\：\\\3 \\\，\\\marketname\\\：\\\LTC \\ \\ / BTC \\\，\\\quantity \\\：\\\0.24680554\\\，\\ \price\\\：\\\0.00694988\\\，\\\total \\\：\\\ 0.00171527\\\，\\\type\\\：\\\Buy\\\}} \，\ channel\：\trade.3\}; 
 
 QString str2 ={\event\：\message\，\data\：{\channel\：\trade .3 \，\trade\：{\tradeid\：\86364698\，\timestamp\：1425420405，\datetime\：\\ \\2015-03-03 17:06:45 EDT\，\marketid\：\3\，\marketname\：\LTC \\ / BTC \，\quantity\：\0.24680554\，\price\：\0.00694988\，\total\：\0.00171527 \\，\type\：\Buy\}}，\channel\：\trade.3 \} 
 
 QJsonDocument doc1 = QJsonDocument :: fromJson（str1.toUtf8（））; 
 QJsonDocument doc2 = QJsonDocument :: fromJson（str2.toUtf8（））; 
 
 qDebug（％s，qPrintable（QString（Str1：\％1 \）arg（str1）））; 
 qDebug（％s，qPrintable（QString（doc1toJson（））））; 
 qDebug（）<< ------------------------------------------------- ----------; 
 qDebug（％s，qPrintable（QString（Str2：\％1 \）arg（str2）））; 
 qDebug（％s，qPrintable（QString（doc2.toJson（））））; 
  

这会输出：

  Str1：{event：message，data：{\channel\：\trade.3 \，\trade\ {\tradeid\：\86364698\，\timestamp\：1425420405，\datetime\：\2015-03-03 17:06:45 EDT\\ \\，\marketid \：\3 \，\marketname\：\LTC \\ / BTC \，\quantity \：\\ \\0.24680554 \，\price\：\0.00694988\，\total\：\0.00171527\，\type\：\ Buy\}}，channel：trade.3}
 {
channel：trade.3，
data：{\ channel\：\trade.3 \，\trade\：{\tradeid\：\86364698\，\timestamp\：1425420405 ，\datetime\：\2015-03-03 17:06:45 EDT\，\marketid\：\3\，\marketname\ ：\LTC \\ / BTC \，\quantity\：\0.24680554\，\price\：\0.00694988\，\ total \：\0.00171527\，\type\：\Buy\}}，
event：message
} 
 
 -------------------------------------------- --------------- 
 Str2：{event：message，data：{channel：trade.3，trade： {tradeid：86364698，timestamp：1425420405，datetime：2015-03-03 17:06:45 EDT，marketid：3，marketname：LTC \ / BTC，quantity：0.24680554，price：0.00694988，total：0.00171527，type：Buy}}，channel：trade.3 $ b {
channel：trade.3，
data：{
channel：trade.3，
trade：{
datetime：2015-03-03 17:06:45 EDT，
marketid：3，
marketname：LTC / BTC，
price：0.00694988，
quantity：0.24680554，
timestamp：1425420405，
total：0.00171527，
tradeid ：86364698，
type：Buy
} 
}，
event：message
} 
  

显然第二个版本是我的目标。有一种方法可以轻松地转换输入数据，或者我将不得不尝试和滚动我自己的转换器功能？

编辑：以下是关于这个特定数据样本...但我仍然认为必须有一个更适当的方式来转换这种东西...

  str1.replace（\\\，\）; 
 str1.replace（\\\\，\\）; 
 str1.replace（\{，{）; 
 str1.replace（} \，}）; 
  

解决方案

您的数据实际上是另一个JSON文档。

只需从doc1.object（）[data]。toString（）;

创建另一个QJsonDocument。但它接缝清楚，数据可以有其他东西，这是一个json doc在这个例子中。

好运！

I'm getting some json data from a pusher.com WebSocket in my qt5 app and I'm struggling to parse the "serialized" json they send. I finally identified the problem but I'm not sure how to solve it:

I made a small test program to demonstrate:

QString str1 = "{\"event\":\"message\",\"data\":\"{\\\"channel\\\":\\\"trade.3\\\",\\\"trade\\\":{\\\"tradeid\\\":\\\"86364698\\\",\\\"timestamp\\\":1425420405,\\\"datetime\\\":\\\"2015-03-03 17:06:45 EDT\\\",\\\"marketid\\\":\\\"3\\\",\\\"marketname\\\":\\\"LTC\\\\/BTC\\\",\\\"quantity\\\":\\\"0.24680554\\\",\\\"price\\\":\\\"0.00694988\\\",\\\"total\\\":\\\"0.00171527\\\",\\\"type\\\":\\\"Buy\\\"}}\",\"channel\":\"trade.3\"}";

QString str2="{\"event\":\"message\",\"data\": {\"channel\":\"trade.3\",\"trade\":{\"tradeid\":\"86364698\",\"timestamp\":1425420405,\"datetime\":\"2015-03-03 17:06:45 EDT\",\"marketid\":\"3\",\"marketname\":\"LTC\\/BTC\",\"quantity\":\"0.24680554\",\"price\":\"0.00694988\",\"total\":\"0.00171527\",\"type\":\"Buy\"}},\"channel\":\"trade.3\"}";

QJsonDocument doc1 = QJsonDocument::fromJson(str1.toUtf8());
QJsonDocument doc2 = QJsonDocument::fromJson(str2.toUtf8());

qDebug("%s", qPrintable(QString("Str1: \"%1\"").arg(str1)));
qDebug("%s", qPrintable(QString(doc1.toJson())));
qDebug() << "-----------------------------------------------------------";
qDebug("%s", qPrintable(QString("Str2: \"%1\"").arg(str2)));
qDebug("%s", qPrintable(QString(doc2.toJson())));

This outputs:

Str1: "{"event":"message","data":"{\"channel\":\"trade.3\",\"trade\":{\"tradeid\":\"86364698\",\"timestamp\":1425420405,\"datetime\":\"2015-03-03 17:06:45 EDT\",\"marketid\":\"3\",\"marketname\":\"LTC\\/BTC\",\"quantity\":\"0.24680554\",\"price\":\"0.00694988\",\"total\":\"0.00171527\",\"type\":\"Buy\"}}","channel":"trade.3"}"
{
    "channel": "trade.3",
    "data": "{\"channel\":\"trade.3\",\"trade\":{\"tradeid\":\"86364698\",\"timestamp\":1425420405,\"datetime\":\"2015-03-03 17:06:45 EDT\",\"marketid\":\"3\",\"marketname\":\"LTC\\/BTC\",\"quantity\":\"0.24680554\",\"price\":\"0.00694988\",\"total\":\"0.00171527\",\"type\":\"Buy\"}}",
    "event": "message"
}

-----------------------------------------------------------
Str2: "{"event":"message","data": {"channel":"trade.3","trade": {"tradeid":"86364698","timestamp":1425420405,"datetime":"2015-03-03 17:06:45 EDT","marketid":"3","marketname":"LTC\/BTC","quantity":"0.24680554","price":"0.00694988","total":"0.00171527","type":"Buy"}},"channel":"trade.3"}"
{
    "channel": "trade.3",
    "data": {
        "channel": "trade.3",
        "trade": {
            "datetime": "2015-03-03 17:06:45 EDT",
            "marketid": "3",
            "marketname": "LTC/BTC",
            "price": "0.00694988",
            "quantity": "0.24680554",
            "timestamp": 1425420405,
            "total": "0.00171527",
            "tradeid": "86364698",
            "type": "Buy"
        }
    },
    "event": "message"
}

Obviously the second version is my goal. Is there a way to easily convert the input data or am I going to have to try and roll my own converter function?

EDIT: The following does the trick on this particular data sample... but I'm still thinking there must be a more proper way to convert this sort of stuff...

str1.replace("\\\"", "\"");
str1.replace("\\\\", "\\");
str1.replace("\"{", "{");
str1.replace("}\"", "}");

解决方案

Your "data" is in fact another JSON document.

Just create another QJsonDocument from doc1.object()["data"].toString();

But it seams clear that "data" can have other things, it is a json doc in this example.

Good Luck!

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