qt5 解析Json文件

淩亂°似流年 2022-03-30 19:44 200阅读 0赞

1.  /\* test.json \*/ 
2.  \{
3.  "appDesc": \{ 
4.  "description": "SomeDescription", 
5.  "message": "SomeMessage" 
6.  \},
7.  "appName": \{ 
8.  "description": "Home", 
9.  "message": "Welcome", 
10. "imp":\["awesome","best","good"\] 
11. \}
12. \}
13. 
14. 
15. void readJson() 
16. \{
17. QString val;
18. QFile file;
19. file.setFileName("test.json"); 
20. file.open(QIODevice::ReadOnly | QIODevice::Text);
21. val = file.readAll();
22. file.close();
23. qWarning() << val;
24. QJsonDocument d = QJsonDocument::fromJson(val.toUtf8());
25. QJsonObject sett2 = d.object();
26. QJsonValue value = sett2.value(QString("appName")); 
27. qWarning() << value;
28. QJsonObject item = value.toObject();
29. qWarning() << tr("QJsonObject of description: ") << item; 
30. 
31. /\* incase of string value get value and convert into string\*/ 
32. qWarning() << tr("QJsonObject\[appName\] of description: ") << item\["description"\]; 
33. QJsonValue subobj = item\["description"\]; 
34. qWarning() << subobj.toString();
35. 
36. /\* incase of array get array and convert into string\*/ 
37. qWarning() << tr("QJsonObject\[appName\] of value: ") << item\["imp"\]; 
38. QJsonArray test = item\["imp"\].toArray(); 
39. qWarning() << test\[1\].toString();
40. \}

http://stackoverflow.com/questions/15893040/how-to-create-read-write-json-files-in-qt5

摘于上面的链接，大部分已经能用了。

我来说下其他情况：

**\[javascript\]** [view plain][] [copy][view plain]

1.  \{ "file":"book.png","frames":\{ 
2.  "v1":\{ "x":1,"y":91,"w":68,"h":87,"offX":0,"offY":0,"sourceW":68,"sourceH":87\}, 
3.  "v2":\{ "x":1,"y":1,"w":68,"h":88,"offX":0,"offY":0,"sourceW":68,"sourceH":88\}, 
4.  "v3":\{ "x":209,"y":1,"w":66,"h":87,"offX":0,"offY":0,"sourceW":66,"sourceH":87\}, 
5.  "v4":\{ "x":71,"y":1,"w":67,"h":88,"offX":0,"offY":0,"sourceW":67,"sourceH":88\}, 
6.  "v5":\{ "x":71,"y":91,"w":67,"h":88,"offX":0,"offY":0,"sourceW":67,"sourceH":88\}, 
7.  "v6":\{ "x":140,"y":1,"w":67,"h":87,"offX":0,"offY":0,"sourceW":67,"sourceH":87\}, 
8.  "v7":\{ "x":140,"y":90,"w":67,"h":87,"offX":0,"offY":0,"sourceW":67,"sourceH":87\}\}\}

像这样的json，想要得到frames里所有的内容，因为它不是一个数组，所以要用迭代器来访问，类似这样的代码：

**\[cpp\]** [view plain][] [copy][view plain]

1.  1.  bool MainWindow::parseJsonFile()\{ 
    2.  
    3.  QString val;
    4.  QFile file;
    5.  file.setFileName("test.json"); 
    6.  file.open(QIODevice::ReadOnly | QIODevice::Text);
    7.  val = file.readAll();
    8.  file.close();
    9.  qWarning() << val;
    10. QJsonDocument d = QJsonDocument::fromJson(val.toUtf8());
    11. QJsonObject rootObject = d.object();
    12. QJsonValue pngNameJsonValue = rootObject.value(QString("file")); 
    13. qWarning() << pngNameJsonValue.toString();
    14. 
    15. QJsonValue framesJsonValue = rootObject.value(QString("frames")); 
    16. qWarning() << framesJsonValue;
    17. 
    18. QStringList imgNameList = framesJsonValue.toObject().keys();
    19. QJsonObject frameObject = framesJsonValue.toObject();
    20. int index = 0; 
    21. for(auto beginItr = frameObject.begin(); beginItr != frameObject.end(); ++beginItr)\{ 
    22. 
    23. QJsonValue eachImageJsonValue = \*beginItr;
    24. 
    25. QJsonObject eachImageJsonObject = eachImageJsonValue.toObject();
    26. 
    27. //eachImageJsonObject\["x"\], eachImageJsonObject\["y"\] ... 
    28. \}
    29. return true; 
    30. \}

[view plain]: http://blog.csdn.net/fox64194167/article/details/50193447#