c++ - 如何将pusher.com的 "serialized"json解析成qt5 QJsonDocument？

Question

我在我的 qt5 应用程序中从 pusher.com WebSocket 获取一些 json 数据，我正在努力解析他们发送的“序列化”json。我终于确定了问题所在，但不确定如何解决:

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

这个输出:

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"}"
{
    "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。有没有一种方法可以轻松转换输入数据，或者我是否必须尝试使用​​自己的转换器函数？

编辑:以下是针对这个特定数据样本的技巧......但我仍然认为必须有更合适的方法来转换这类东西......

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

Answer 1

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;

但很明显“数据”可以有其他东西，在这个例子中它是一个 json 文档。

祝你好运!