• json数据解析

    目录

    一、读数据

     1、简单对象读取

    2、数组读取

    3、对象读取

    二、写数据

    1、简单生成JSON

    2、对象数组JSON

    3、嵌套对象

    三、一个综合例子

    1、读JSON

    2、写JSON

    一、读数据

     1、简单对象读取

    1. {
    2.   "app": "xnwVideo",
    3.   "src": "C:\\build-video\\Output",
    4.   "dest": "C:\\build-video\\1.0.32",
    5.   "version": "1.0.32",
    6.   "build": 32,
    7.   "note": "布局json读取",
    8.   "act": "All"
    9. }

    1. 		CBinBuf buf;
    2. 		buf.ReadFile("jsonInfo.json");
    3. 		CJsonObj json(buf);
    4.  
    5. 		CBinBuf app, src, des, note, build, fullVersion, act;
    6. 		json.getString("app", app);
    7. 		json.getString("src", src);
    8. 		json.getString("dest", des);
    9. 		json.getString("note", note);
    10. 		json.getString("build", build);
    11. 		json.getString("version", fullVersion);
    12. 		json.getString("act", act);

    2、数组读取

    文件如下：

    1. [
    2.   {
    3.     "id": "Integrated Webcam:\\\\?\\usb#22vid_0c45&pid_671f&mi_00#226&8c5ffc6&0&0000#22{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global",
    4.     "res": "1280x720"
    5.   },
    6.   {
    7.     "id": "XSplit VCam:\\\\?\\root#22image#220000#22{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global",
    8.     "res": "1280x720"
    9.   },
    10.   {
    11.     "id": "YY开播:",
    12.     "res": "1280x720"
    13.   },
    14.   {
    15.     "id": "c922 Pro Stream Webcam:\\\\?\\usb#22vid_046d&pid_085c&mi_00#227&1e59b99a&0&0000#22{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global",
    16.     "res": "1920x1080"
    17.   }
    18. ]

    读取方式：

    1. 	std::map camIDResMap_;
    2.  
    3.  
    4. 	CBinBuf buf;
    5. 	buf.ReadFile(jsonPath.c_str());
    6. 	CJsonObj json(buf);
    7.  
    8. 	for (int i = 0; i < json.get_arry_size(); ++i)
    9. 	{
    10. 		CJsonObj * pJson = json.get_arry_at(i);
    11. 		string id, res;
    12. 		pJson->getString("id", id);
    13. 		pJson->getString("res", res);
    14.  
    15. 		camIDResMap_[id] = res;
    16. 	}

    类似的还有：

    1. 			for (int i = 0; i < class_info->get_arry_size(); ++i) {
    2. 				CJsonObj* pJson = class_info->get_arry_at(i);
    3.  
    4. 				std::string courseID, chapterID, qID, chapterName, startTime, endTime, className, imgUrl;
    5. 				int nStatus;
    6.  
    7. 				pJson->getString("course.id", courseID);
    8. 				pJson->getString("id", chapterID);				
    9. 				pJson->getString("class.qid", qID);
    10.  
    11.  
    12. 				pJson->getString("name", chapterName);
    13. 				
    14. 				pJson->getString("start_time", startTime);
    15. 				pJson->getString("end_time", endTime);
    16. 				nStatus = pJson->getInt("live_status");
    17.  
    18. 				/*
    19. 								CJsonObj* pCourseJson = pJson->getObj("course", err);
    20. 								pCourseJson->getString("name", className);								
    21. 								pCourseJson->getString("cover_url", imgUrl);
    22. 				*/
    23. 				
    24. 				pJson->getString("course.name", className);
    25. 				pJson->getString("course.cover_url", imgUrl);
    26. 				
    27.  
    28.  
    29. 				//time
    30. 				long iStartTime = atoi(startTime.c_str());
    31. 				long iEndTime = atoi(endTime.c_str());
    32. 				std::string timeStr = GetTimeStr(iStartTime, iEndTime);
    33.  
    34. 				//添加列表中
    35. 				ui::ListContainerElement* pItem = dynamic_cast(ui::GlobalManager::CreateBoxWithCache(L"myClass/myclass_list_item.xml"));
    36. 				myClass_list->Add(pItem);
    37.  
    38.  
    39. 				if (curCourseId==courseID&&curChapterId==chapterID)
    40. 				{
    41. 					m_pCurItem = pItem; //刷新后，重置当前节点
    42.  
    43. 					bCurItemReseted = TRUE;
    44. 				}
    45.  
    46.  
    47. 			
    48. 				//详细信息设置
    49. 				SetText(pItem, L"courseName", nbase::UTF8ToUTF16(className).c_str());
    50. 				SetText(pItem, L"chapterName", nbase::UTF8ToUTF16(chapterName).c_str());
    51. 				SetText(pItem, L"time", MyString::stows(timeStr).c_str());//asic->utf
    52. 				SetDataID(pItem, L"time", startTime);
    53. 				SetDataID(pItem, L"courseName", endTime);    //此项利用上，保存这节课结束时间
    54.  
    55.  
    56. 				std::wstring statusStr;
    57. 				switch (nStatus)
    58. 				{
    59. 				case 0:
    60. 					statusStr = L"未开始";
    61. 					break;
    62.  
    63. 				case 1:
    64. 					statusStr = L"正在直播";
    65. 					break;
    66. 				case 4:
    67. 					statusStr = L"正在直播";
    68. 					break;
    69.  
    70. 				case 2:
    71. 					statusStr = L"已结束";
    72. 					break;
    73.  
    74. 				case 3:
    75. 					statusStr = L"缺课";
    76. 					break;
    77. 				}
    78. 				SetText(pItem, L"live_status", statusStr);
    79.  
    80.  
    81. 				ui::Control* pClassPhoto = (ui::Control*)pItem->FindSubControl(L"classPhoto");
    82. 				if (pClassPhoto)
    83. 				{
    84. 					//根据Json  传来的照片网址，与本地地址映射
    85. 					//之所以加?做分隔符，是因为文件名不能包含?
    86.  
    87. 					std::wstring url = nbase::UTF8ToUTF16(imgUrl);
    88.  
    89. 					//此段代码用于线程下载时使用
    90. 					std::wstring IndexStr = std::to_wstring(i);
    91. 					std::wstring pathTemp = MyString::format(L"tmp\\classPhoto%s.png", IndexStr.c_str());
    92. 					std::wstring localPath = IndexStr + L"?" + localFoldPathW + pathTemp;
    93. 					std::wstring remotePath = IndexStr + L"|" + url;
    94. 					AddMapItem(remotePath, localPath);
    95. 					///
    96.  
    97. 					xnw_http_download(imgUrl.c_str(), GetHWND(), i);
    98. 				}
    99.  
    100. 				ui::Button* pEnterLSRoomBtn = (ui::Button*)pItem->FindSubControl(L"enterLiveRoom_Btn");				
    101. 				pEnterLSRoomBtn->AttachClick(nbase::Bind(&MyClassForm::EnterRoom, this, std::placeholders::_1));
    102. 			
    103. 				pItem->SetUTF8DataID(courseID); //设置item标识为章节ID
    104. 				pEnterLSRoomBtn->SetUTF8DataID(chapterID);
    105. 				pClassPhoto->SetUTF8DataID(qID);
    106. 			}
    107.  
    108. 			if (!bCurItemReseted)
    109. 			{
    110. 				m_pCurItem = NULL;
    111. 			}
    112. 		}

    3、对象读取

    1. {
    2.   "list": [
    3.     {
    4.       "name": "亮度92",
    5.       "props": {
    6.         "BacklightCompensation": 1,
    7.         "Brightness": 92,
    8.         "ColorEnable": 16,
    9.         "Contrast": 91,
    10.         "Gain": 16,
    11.         "Gamma": 62,
    12.         "Hue": 91,
    13.         "Saturation": 255,
    14.         "Sharpness": 62,
    15.         "WhiteBalance": -1
    16.       },
    17.       "control": {
    18.         "Exposure": -4,
    19.         "Focus": 0,
    20.         "Iris": 100,
    21.         "Pan": 0,
    22.         "Roll": 0,
    23.         "Tilt": 0,
    24.         "Zoom": 100
    25.       }
    26.     },
    27.     {
    28.       "name": "高亮170",
    29.       "props": {
    30.         "BacklightCompensation": 0,
    31.         "Brightness": 170,
    32.         "ColorEnable": 3,
    33.         "Contrast": 128,
    34.         "Gain": 3,
    35.         "Gamma": 188,
    36.         "Hue": 128,
    37.         "Saturation": 128,
    38.         "Sharpness": 188,
    39.         "WhiteBalance": -1
    40.       },
    41.       "control": {
    42.         "Exposure": -4,
    43.         "Focus": 0,
    44.         "Iris": 100,
    45.         "Pan": 0,
    46.         "Roll": 0,
    47.         "Tilt": 0,
    48.         "Zoom": 100
    49.       }
    50.     }
    51.   ]
    52. }

    对象的值又是数组的情况下，读取方式

    1.  
    2. 	CJsonObj ampJson(jsonS.c_str());
    3.  
    4. 	{
    5. 		int nCount = 0;
    6. 		int err;
    7.  
    8. 		CJsonObj* arry = ampJson.getObj("list", err);
    9. 		if (arry && arry->isarray()) {
    10. 			nCount = arry->get_arry_size();
    11. 			std::string s;
    12. 			std::wstring name;
    13.  
    14. 			for (int i = 0; i < arry->get_arry_size(); ++i) {
    15.  
    16. 				CJsonObj* pJson = arry->get_arry_at(i);
    17. 				pJson->getString("name", s);
    18. 				name = to_wchar_t(s);
    19.  
    20. 				g_SelfCamAmpPropNameVec.push_back(name);
    21. 			}
    22.  
    23. 		}
    24. 	}

    类似的还有

    1.     CBinBuf bfJson;
    2.     if(bfJson.ReadFile(m_file)) {
    3.         load(bfJson, 0);
    1.     void load(const char* jstr, int merge) {
    2.         uint32_t now = (uint32_t)time(0);
    3.         CJsonObj js(jstr);
    4.         m_tm = js.getInt("tm", 0);
    5.         m_tmReport = js.getInt("tmReport", now);
    6.         int err;
    7.         CJsonObj* pList = js.getObj("list", err);
    8.         if(pList) {
    9.             std::vector v, vOld;
    10.             if(merge) {
    11.                 for(int i=0; isize(); ++i) vOld.push_back(m_vCdn[i]);
    12.             }
    13.             m_vCdn.clear();
    14.             for(int i=0; iget_arry_size(); ++i) {
    15.                 CDNINFO c;
    16.                 CJsonObj* pItem = pList->get_arry_at(i);
    17.                 c.from(pItem);
    18.                 add(c, merge, vOld);
    19.             }
    20.         }
    21.     }


     

    二、写数据

    1、简单生成JSON

    1. 	CJsonString bf("{");
    2. 	bf.append_item("file", szUtf8);
    3. 	bf.append_item("url", cbitem->url);
    4. 	bf.append_item("wparam",(uint64_t)cbitem->wParam);
    5. 	bf.close("}");

      又如，

    1. void MakeDefaultJson(CJsonString &jsonStr){
    2.  
    3. 	jsonStr.append_item("is_beauty_on", 1); //美颜全局开关，0为关，1为开，默认为1
    4.  
    5. 	//滤镜 
    6. 	jsonStr.append_item("filter_level", 0);   //0-10  ->[0,1] 取值范围 0.0-1.0,0.0为无效果，1.0为最大效果，默认值1.0
    7. 	jsonStr.append_item("filter_name", "origin");
    8.  
    9. 	//美白
    10. 	jsonStr.append_item("color_level", 2);    //0-20  [0,2.0] 取值范围 0.0-2.0,0.0为无效果，2.0为最大效果，默认值0.2
    11. 	//红润
    12. 	jsonStr.append_item("red_level", 5);      //0-20  [0,2.0] 取值范围 0.0-2.0,0.0为无效果，2.0为最大效果，默认值0.5
    13.  
    14. 	//磨皮程度
    15. 	jsonStr.append_item("blur_level", 60);        //[0,6.0] 磨皮程度，取值范围0.0-6.0，默认6.0
    16. 	jsonStr.append_item("skin_detect", 0);        //肤色检测开关，0为关，1为开 默认0
    17. 	jsonStr.append_item("nonskin_blur_scale", 0); //0-10 [0,1]肤色检测之后非肤色区域的融合程度，取值范围0.0-1.0，默认0.0
    18.  
    19. 	jsonStr.append_item("heavy_blur", 0);         //朦胧磨皮开关，0为清晰磨皮，1为朦胧磨皮
    20. 	jsonStr.append_item("blur_type", 2);          //此参数优先级比heavy_blur低，在使用时要将heavy_blur设为0，0 清晰磨皮  1 朦胧磨皮  2精细磨皮
    21. 	jsonStr.append_item("blur_use_mask", 0);      //ios端默认为1，其他端默认为0。1为开启基于人脸的磨皮mask，0为不使用mask正常磨皮。只在blur_type为2时生效。
    22.  
    23. 	jsonStr.append_item("sharpen", 2);            //锐化程度，取值范围0.0-1.0，默认0.2
    24.  
    25. 	jsonStr.close();
    26. 	//jsonStr.WriteFile("jsonInfoRes.json");
    27. }

    参考： c++  一个经典的json库 生成json串方法

    1.  
    2. 	Json::Value value;
    3. 	value["x"] = 1;
    4. 	value["y"] = 2;
    5. 	value["w"] = 3;
    6.  
    7. 	std::string  styleS = value.toStyledString();

    2、对象数组JSON

    1. 	CJsonString jsonStr;
    2. 	jsonStr.begin("[");
    3.  
    4. 	for (auto &it : camIDResMap)
    5. 	{
    6. 		CJsonString camJson;
    7. 		camJson.begin("{");
    8. 		camJson.append_item("id", it.first.c_str());
    9. 		camJson.append_item("res", it.second.c_str());
    10.  
    11. 		camJson.close("}");
    12. 		jsonStr.append_obj(camJson);
    13. 	}
    14.  
    15. 	jsonStr.close("]");
    16.  
    17. 	jsonStr.WriteFile(m_camjsonPath);

    3、嵌套对象

    1. {
    2.   "list": [
    3.     {
    4.       "name": "亮度92",
    5.       "props": {
    6.         "BacklightCompensation": 1,
    7.         "Brightness": 92
    8.       },
    9.       "control": {
    10.         "Exposure": -4,
    11.         "Zoom": 100
    12.       }
    13.     },
    14.     {
    15.       "name": "高亮170",
    16.       "props": {
    17.         "BacklightCompensation": 0,
    18.         "WhiteBalance": -1
    19.       },
    20.       "control": {
    21.         "Exposure": -4,
    22.         "Zoom": 100
    23.       }
    24.     }
    25.   ]
    26. }

    1.  
    2. 	CJsonString jsonStr;
    3. 	jsonStr.begin("[");
    4.  
    5. 	int nCount = 0;
    6.  
    7. 	for (auto &it : selfCamPros_)
    8. 	{
    9. 		std::mapint> &Map = it.second;
    10. 		std::wstring nameW = it.first;
    11.  
    12. 		std::mapint> &ctlMap = selfCamControls_[nameW];
    13.  
    14. 		std::string name = to_string(nameW);
    15.  
    16. 		CJsonString camAllJson;
    17. 		camAllJson.begin("{");
    18. 		camAllJson.append_item("name", name.c_str());
    19.  
    20. 		CJsonString ampJsonObj;
    21. 		ampJsonObj.begin("{");
    22. 		auto oneAmpIt = ampMap.begin();
    23. 		while (oneAmpIt != ampMap.end())
    24. 		{
    25. 			ampJsonObj.append_item(oneAmpIt->first.c_str(), oneAmpIt->second);
    26. 			oneAmpIt++;
    27. 		}
    28.  
    29. 		ampJsonObj.close("}");
    30. 		camAllJson.append_obj("props", ampJsonObj);
    31.  
    32.  
    33. 		CJsonString ctlJsonObj;
    34. 		ctlJsonObj.begin("{");
    35. 		auto oneCtlIt = ctlMap.begin();
    36. 		while (oneCtlIt != ctlMap.end())
    37. 		{
    38. 			ctlJsonObj.append_item(oneCtlIt->first.c_str(), oneCtlIt->second);
    39. 			oneCtlIt++;
    40. 		}
    41. 		ctlJsonObj.close("}");
    42. 		camAllJson.append_obj("control", ctlJsonObj);
    43.  
    44.  
    45.  
    46. 		camAllJson.close("}");
    47.  
    48.  
    49. 		jsonStr.append_obj(camAllJson);
    50. 	}
    51.  
    52. 	jsonStr.close("]");
    53.  
    54.  
    55. 	CJsonString listObjJsonS;
    56. 	listObjJsonS.begin("{");
    57. 	listObjJsonS.append_obj("list", jsonStr);
    58. 	listObjJsonS.close("}");
    59.  
    60.  
    61. 	listObjJsonS.WriteFile(sysJsonPath);

    又如，

    1.         CJsonString js, list;
    2.         js.append_item_u32("tm", m_tm);
    3.         js.append_item_u32("tmReport", m_tmReport);
    4.         format_json(list);
    5.         js.append_obj("list", list);
    6.         js.close("}");
    7.         js.WriteFile(m_file);
    1.     void format_json(CJsonString& js) {
    2.         js.begin("[");
    3.         size_t n = m_vCdn.size();
    4.         for(int i=0; i
    5.             CDNINFO& c = m_vCdn[i];
    6.             CJsonString cdn;
    7.             c.format(cdn);
    8.             js.append_obj(cdn);
    9.         }
    10.         js.close("]");
    11.     }
    12.  
    13.

    又如，

    1. 		CJsonString js,list;
    2. 		list.begin("[");
    3.  
    4. 		for (auto it = nameVec.begin(); it != nameVec.end(); it++)
    5. 		{
    6.  
    7. 			CJsonString jsObj;
    8. 			std::wstring name = *it;
    9.  
    10. 			if (name == L"类别")
    11. 				continue;
    12.  
    13. 			std::string name8 = nbase::UTF16ToUTF8(name);
    14.  
    15. 			jsObj.begin("{");
    16. 			jsObj.append_item("name", name8.c_str());
    17. 			jsObj.close("}");
    18.  
    19. 			list.append_obj(jsObj);
    20. 		}
    21. 		list.close("]");
    22.  
    23. 		js.append_obj("list", list);
    24. 		js.close("}");
    25. 		js.WriteFile("d:\\name.json");

    三、一个综合例子

    1、JSON路径

    1. std::string GetXnwAccountJsonPath(){
    2.  
    3. 	static std::string path;	
    4. 	if (!path.empty())
    5. 	{
    6. 		return path;
    7. 	}
    8.  
    9. 	std::wstring pathaW;
    10.  
    11. 	if (BCurDirHaveWriteAuthority())
    12. 		pathaW = appFolderW + L"\\account.json";
    13. 	else
    14. 		pathaW = GetXnwSysAppDataDirW() + L"\\account.json";
    15.  
    16. 	path = nbase::UTF16ToUTF8(pathaW);
    17. 	return path;
    18. }

    2、读JSON

    1. 	std::set acountSet_;
    2.  
    3. 	std::set acountPhoneSet_;
    4.  
    5. void ReadAcountSet()
    6. {
    7. 	std::string path = GetXnwAccountJsonPath();
    8.  
    9. 	CBinBuf buf;
    10. 	if (buf.Read(path.c_str()))
    11. 	{
    12. 		CJsonObj json(buf);
    13. 		int err;
    14. 		CJsonObj* arry = json.getObj("nameArr", err);
    15. 		if (arry && arry->isarray())
    16. 		{
    17. 		
    18. 			for (int i = 0; i < arry->get_arry_size(); ++i)
    19. 			{
    20. 				CJsonObj * pJson = arry->get_arry_at(i);
    21. 				std::string name;
    22. 				pJson->getString("account", name);
    23.  
    24. 				if (!name.empty())
    25. 				{
    26. 					std::wstring namew = nbase::UTF8ToUTF16(name);
    27. 					acountSet_.insert(namew);
    28. 				}
    29.  
    30.  
    31. 			}
    32.  
    33. 		}
    34.  
    35. 		arry = json.getObj("phoneArr", err);
    36. 		if (arry && arry->isarray())
    37. 		{
    38.  
    39. 			for (int i = 0; i < arry->get_arry_size(); ++i)
    40. 			{
    41. 				CJsonObj * pJson = arry->get_arry_at(i);
    42. 				std::string name;
    43. 				pJson->getString("account", name);
    44.  
    45. 				std::wstring namew = nbase::UTF8ToUTF16(name);
    46. 				acountPhoneSet_.insert(namew);
    47.  
    48. 			}
    49.  
    50. 		}
    51.  
    52.          arry = json.getObj("apiArr", err);
    53. 		if (arry && arry->isarray())
    54. 		{
    55.  
    56. 			for (int i = 0; i < arry->get_arry_size(); ++i)
    57. 			{
    58. 				CJsonObj* pJson = arry->get_arry_at(i);
    59. 				std::string account;
    60. 				std::string api;
    61. 				pJson->getString("account", account);
    62. 				pJson->getString("api", api);
    63. 				g_AccoutApiMap[account] = api;
    64.  
    65. 			}
    66. 		}
    67.  
    68. 	}
    69.  
    70.  
    71.  
    72. }

    3、保存JSON

    1. void SaveAcountSet()
    2. {
    3.  
    4. 	std::string path = GetXnwAccountJsonPath();
    5.  
    6. 	CJsonString listJsonStr;
    7. 	listJsonStr.begin("{");
    8.  
    9. 	CJsonString jsonStr;
    10. 	jsonStr.begin("[");
    11.  
    12.  
    13. 	for (auto &it : acountSet_)
    14. 	{
    15. 		std::string name = nbase::UTF16ToUTF8(it);
    16. 		CJsonString json;
    17.  
    18. 		json.begin("{");
    19. 		json.append_item("account", name.c_str());
    20. 		json.close("}");
    21.  
    22. 		jsonStr.append_obj(json);
    23. 	}
    24.  
    25. 	jsonStr.close("]");
    26.  
    27. 	listJsonStr.append_obj("nameArr", jsonStr);
    28.  
    29.  
    30. 	CJsonString jsonStr2;
    31. 	jsonStr2.begin("[");
    32. 	for (auto &it : acountPhoneSet_)
    33. 	{
    34. 		std::string name = nbase::UTF16ToUTF8(it);
    35. 		CJsonString json;
    36.  
    37. 		json.begin("{");
    38. 		json.append_item("account", name.c_str());
    39. 		json.close("}");
    40.  
    41. 		jsonStr2.append_obj(json);
    42. 	}
    43.  
    44. 	jsonStr2.close("]");
    45. 	listJsonStr.append_obj("phoneArr", jsonStr2);
    46.  
    47.  
    48. 	CJsonString jsonStr3;
    49. 	jsonStr3.begin("[");
    50. 	for (auto& it : g_AccoutApiMap)
    51. 	{
    52. 		std::string account = it.first;
    53. 		std::string api = it.second;
    54.  
    55. 		CJsonString json;
    56.  
    57. 		json.begin("{");
    58. 		json.append_item("account", account.c_str());
    59. 		json.append_item("api", api.c_str());
    60. 		json.close("}");
    61.  
    62. 		jsonStr3.append_obj(json);
    63. 	}
    64.  
    65. 	jsonStr3.close("]");
    66.  
    67. 	listJsonStr.append_obj("apiArr", jsonStr3);
    68.  
    69.  
    70.  
    71. 	listJsonStr.close("}");
    72.  
    73. 	listJsonStr.WriteFile(path.c_str());
    74. }

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  • 原文地址：https://blog.csdn.net/shuilan0066/article/details/98732237