cJSON结构体构建

一：cJSON的构建。

1 int create_objects()

2 {

3 cJSON *root, *fmt, *img, *thm, *fld;

4 char *out;

5 int i; /* The index number. */

6 int ret = 0;

7

8 /* Here we construct several JSON objects. */

9

10 // ------------------构建第1个----------------------

11 /* The "Video" data type: */

12 root = cJSON_CreateObject();

13 cJSON_AddItemToObject(root, "name", cJSON_CreateString("Jack (\"Bee\") Nimble"));

14 cJSON_AddItemToObject(root, "format", fmt = cJSON_CreateObject());

15 cJSON_AddStringToObject(fmt, "type", "rect");

16 cJSON_AddNumberToObject(fmt, "width", 1920);

17 cJSON_AddNumberToObject(fmt, "height", 1080);

18 cJSON_AddFalseToObject (fmt, "interlace");

19 cJSON_AddNumberToObject(fmt, "frame rate", 24);

20

21 out = cJSON_Print(root); /* Print to text */

22 cJSON_Delete(root); /* Delete the cJSON object */

23 LOG_I(cjson_example, "%s\n", out); /* Print out the text */

24 cJSON_free(out); /* Release the string. */

25

26 // ------------------构建第2个----------------------

27 /* The "days of the week" array: */

28 const char *strings[7] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

29 root = cJSON_CreateStringArray(strings, 7);

30

31 out = cJSON_Print(root);

32 cJSON_Delete(root);

33 LOG_I(cjson_example, "%s\n", out);

34 cJSON_free(out);

35

36 // ------------------构建第3个----------------------

37 /* The matrix: */

38 int numbers[3][3] = {{0, -1, 0}, {1, 0, 0}, {0, 0, 1}};

39 root = cJSON_CreateArray();

40 for (i = 0; i < 3; i++) {

41 cJSON_AddItemToArray(root, cJSON_CreateIntArray(numbers[i], 3));

42 }

43

44 /* cJSON_ReplaceItemInArray(root,1,cJSON_CreateString("Replacement")); */

45 out = cJSON_Print(root);

46 cJSON_Delete(root);

47 LOG_I(cjson_example, "%s\n", out);

48 cJSON_free(out);

49

50 // ------------------构建第4个----------------------

51 /* The "gallery" item: */

52 int ids[4] = {116, 943, 234, 38793};

53 root = cJSON_CreateObject();

54 cJSON_AddItemToObject(root, "Image", img = cJSON_CreateObject());

55 cJSON_AddNumberToObject(img, "Width", 800);

56 cJSON_AddNumberToObject(img, "Height", 600);

57 cJSON_AddStringToObject(img, "Title", "View from 15th Floor");

58 cJSON_AddItemToObject(img, "Thumbnail", thm = cJSON_CreateObject());

59 cJSON_AddStringToObject(thm, "Url", "http:/*www.example.com/image/481989943");

60 cJSON_AddNumberToObject(thm, "Height", 125);

61 cJSON_AddStringToObject(thm, "Width", "100");

62 cJSON_AddItemToObject(img, "IDs", cJSON_CreateIntArray(ids, 4));

63

64 out = cJSON_Print(root);

65 cJSON_Delete(root);

66 LOG_I(cjson_example, "%s\n", out);

67 cJSON_free(out);

68

69 // ------------------构建第5个----------------------

70 /* The array of "records": */

71 struct record fields[2] = {

72 {"zip", 37.7668, -1.223959e+2, "", "SAN FRANCISCO", "CA", "94107", "US"},

73 {"zip", 37.371991, -1.22026e+2, "", "SUNNYVALE", "CA", "94085", "US"}

74 };

75

76 root = cJSON_CreateArray();

77 for (i = 0; i < 2; i++) {

78 cJSON_AddItemToArray(root, fld = cJSON_CreateObject());

79 cJSON_AddStringToObject(fld, "precision", fields[i].precision);

80 cJSON_AddNumberToObject(fld, "Latitude", fields[i].lat);

81 cJSON_AddNumberToObject(fld, "Longitude", fields[i].lon);

82 cJSON_AddStringToObject(fld, "Address", fields[i].address);

83 cJSON_AddStringToObject(fld, "City", fields[i].city);

84 cJSON_AddStringToObject(fld, "State", fields[i].state);

85 cJSON_AddStringToObject(fld, "Zip", fields[i].zip);

86 cJSON_AddStringToObject(fld, "Country", fields[i].country);

87 }

88

89 /* cJSON_ReplaceItemInObject(cJSON_GetArrayItem(root,1),"City",cJSON_CreateIntArray(ids,4)); */

90 out = cJSON_Print(root);

91 cJSON_Delete(root);

92 LOG_I(cjson_example, "%s\n", out);

93 cJSON_free(out);

94 return ret;

95 }

二：打印如下

1 {

2

3 "name": "Jack (\"Bee\") Nimble",

4

5 "format": {

6

7 "type": "rect",

8

9 "width": 1920,

10

11 "height": 1080,

12

13 "interlace": false,

14

15 "frame rate": 24

16

17 }

18

19 }

20

21 ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]

22

23 [[0, -1, 0], [1, 0, 0], [0, 0, 1]]

24

25 {

26

27 "Image": {

28

29 "Width": 800,

30

31 "Height": 600,

32

33 "Title": "View from 15th Floor",

34

35 "Thumbnail": {

36

37 "Url": "http:/*www.example.com/image/481989943",

38

39 "Height": 125,

40

41 "Width": "100"

42

43 },

44

45 "IDs": [116, 943, 234, 38793]

46

47 }

48

49 }

50

51 [{

52

53 "precision": "zip",

54

55 "Latitude": 37.7668,

56

57 "Longitude": -122.3958999999999,

58

59 "Address": "",

60

61 "City": "SAN FRANCISCO",

62

63 "State": "CA",

64

65 "Zip": "94107",

66

67 "Country": "US"

68

69 }, {

70

71 "precision": "zip",

72

73 "Latitude": 37.371991,

74

75 "Longitude": -122.02

76 。。。

标签：cJSON,root,out,AddStringToObject,fld,fields,AddNumberToObject

来源： https://www.cnblogs.com/LiuYanYGZ/p/10259733.html