json-c-0.9 在linux上编译使用
总结json-c-0.9 在linux上编译使用的方法,和一个简单的例子。
1.
将json-c-0.9解压,这里选择目录/home/lesterpang/fs/json-c-0.9
2.
指令下述命令
- # cd /home/lesterpang/fs/json-c-0.9/
- # ./configure
- # make
- # make install
我这里执行命令使用的root用户,在使用个人用户执行时,在make install处出现错误。
3.
查看install是否正确完成
在目录/usr/local/include/json/下有如下文件:
json.h
bits.h
debug.h
linkhash.h
arraylist.h
printbuf.h
json_util.h
json_object.h
json_object_private.h
json_tokener.h
在目录/usr/local/lib/下有如下文件:
libjson.so.0.0.1
libjson.so.0 -> libjson.so.0.0.1
libjson.so -> libjson.so.0.0.1
libjson.la
libjson.a
4.
在/etc/ld.so.conf文件中添加此lib目录
- include /usr/local/lib
执行完上述步骤并未出现错误后,编译安装完成,下面给一使用例子。
5.
此代码来自《JSON c 语言开发指南》,作者不详。
代码如下:
- 1 #include <stdio.h>
- 2 #include <stdlib.h>
- 3 #include <stddef.h>
- 4 #include <string.h>
- 5
- 6 #include "json.h"
- 7
- 8 int main(int argc, char **argv)
- 9 {
- 10 struct json_tokener *tok;
- 11 struct json_object *my_string, *my_int, *my_object, *my_array;
- 12 struct json_object *new_obj;
- 13 int i;
- 14
- 15 my_string = json_object_new_string("\t");
- 16
- 17 printf("my_string=%s\n", json_object_get_string(my_string));
- 18 printf("my_string.to_string()=%s\n", json_object_to_json_string(my_string));
- 19 json_object_put(my_string);
- 20
- 21 my_string = json_object_new_string("\\");
- 22 printf("my_string=%s\n", json_object_get_string(my_string));
- 23 printf("my_string.to_string()=%s\n", json_object_to_json_string(my_string));
- 24 json_object_put(my_string);
- 25
- 26 my_string = json_object_new_string("foo");
- 27 printf("my_string=%s\n", json_object_get_string(my_string));
- 28 printf("my_string.to_string()=%s\n", json_object_to_json_string(my_string));
- 29
- 30 my_int = json_object_new_int(9);
- 31 printf("my_int=%d\n", json_object_get_int(my_int));
- 32 printf("my_int.to_string()=%s\n", json_object_to_json_string(my_int));
- 33
- 34 my_array = json_object_new_array();
- 35 json_object_array_add(my_array, json_object_new_int(1));
- 36 json_object_array_add(my_array, json_object_new_int(2));
- 37 json_object_array_add(my_array, json_object_new_int(3));
- 38 json_object_array_put_idx(my_array, 4, json_object_new_int(5));
- 39 printf("my_array=\n");
- 40 for(i=0; i < json_object_array_length(my_array); i++) {
- 41 struct json_object *obj = json_object_array_get_idx(my_array, i);
- 42 printf("\t[%d]=%s\n", i, json_object_to_json_string(obj));
- 43 }
- 44 printf("my_array.to_string()=%s\n", json_object_to_json_string(my_array));
- 45
- 46 my_object = json_object_new_object();
- 47 json_object_object_add(my_object, "abc", json_object_new_int(12));
- 48 json_object_object_add(my_object, "foo", json_object_new_string("bar"));
- 49 json_object_object_add(my_object, "bool0", json_object_new_boolean(0));
- 50 json_object_object_add(my_object, "bool1", json_object_new_boolean(1));
- 51 json_object_object_add(my_object, "baz", json_object_new_string("bang"));
- 52 json_object_object_add(my_object, "baz", json_object_new_string("fark"));
- 53 json_object_object_del(my_object, "baz");
- 54
- 55 printf("my_object=\n");
- 56 json_object_object_foreach(my_object, key, val) {
- 57 printf("\t%s: %s\n", key, json_object_to_json_string(val));
- 58 }
- 59 printf("my_object.to_string()=%s\n", json_object_to_json_string(my_object));
- 60
- 61 new_obj = json_tokener_parse("\"\003\"");
- 62 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 63 json_object_put(new_obj);
- 64
- 65 new_obj = json_tokener_parse("/* hello */\"foo\"");
- 66 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 67 json_object_put(new_obj);
- 68
- 69 new_obj = json_tokener_parse("// hello\n\"foo\"");
- 70 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 71 json_object_put(new_obj);
- 72
- 73 new_obj = json_tokener_parse("\"\\u0041\\u0042\\u0043\"");
- 74 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 75 json_object_put(new_obj);
- 76
- 77 new_obj = json_tokener_parse("null");
- 78 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 79 json_object_put(new_obj);
- 80
- 81 new_obj = json_tokener_parse("True");
- 82 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 83 json_object_put(new_obj);
- 84
- 85 new_obj = json_tokener_parse("12");
- 86 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 87 json_object_put(new_obj);
- 88
- 89
- 90 new_obj = json_tokener_parse("12.3");
- 91
- 92 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 93 json_object_put(new_obj);
- 94
- 95 new_obj = json_tokener_parse("[\"\\n\"]");
- 96 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 97 json_object_put(new_obj);
- 98
- 99 new_obj = json_tokener_parse("[\"\\nabc\\n\"]");
- 100 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 101 json_object_put(new_obj);
- 102
- 103 new_obj = json_tokener_parse("[null]");
- 104 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 105 json_object_put(new_obj);
- 106
- 107 new_obj = json_tokener_parse("[]");
- 108 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 109 json_object_put(new_obj);
- 110
- 111 new_obj = json_tokener_parse("[false]");
- 112 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 113 json_object_put(new_obj);
- 114
- 115 new_obj = json_tokener_parse("[\"abc\",null,\"def\",12]");
- 116 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 117 json_object_put(new_obj);
- 118
- 119 new_obj = json_tokener_parse("{}");
- 120 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 121 json_object_put(new_obj);
- 122
- 123 new_obj = json_tokener_parse("{ \"foo\": \"bar\" }");
- 124 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 125 json_object_put(new_obj);
- 126
- 127 new_obj = json_tokener_parse("{ \"foo\": \"bar\", \"baz\": null, \"bool0\": true }");
- 128 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 129 json_object_put(new_obj);
- 130
- 131 new_obj = json_tokener_parse("{ \"foo\": [null, \"foo\"] }");
- 132 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 133 json_object_put(new_obj);
- 134
- 135 new_obj = json_tokener_parse("{ \"abc\": 12, \"foo\": \"bar\", \"bool0\": false, \"bool1\": true, \"arr\": [ 1, 2, 3, null, 5 ] }");
- 136 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 137 json_object_put(new_obj);
- 138
- 139 new_obj = json_tokener_parse("{ foo }");
- 140 if(is_error(new_obj)) printf("got error as expected\n");
- 141
- 142 new_obj = json_tokener_parse("foo");
- 143 if(is_error(new_obj)) printf("got error as expected\n");
- 144
- 145 new_obj = json_tokener_parse("{ \"foo");
- 146 if(is_error(new_obj)) printf("got error as expected\n");
- 147
- 148 tok = json_tokener_new();
- 149 new_obj = json_tokener_parse_ex(tok, "{ \"foo", 6);
- 150 if(is_error(new_obj)) printf("got error as expected\n");
- 151 new_obj = json_tokener_parse_ex(tok, "\": {\"bar", 8);
- 152 if(is_error(new_obj)) printf("got error as expected\n");
- 153 new_obj = json_tokener_parse_ex(tok, "\":13}}", 6);
- 154 printf("new_obj.to_string()=%s\n", json_object_to_json_string(new_obj));
- 155 json_object_put(new_obj);
- 156 json_tokener_free(tok);
- 157
- 158 json_object_put(my_string);
- 159 json_object_put(my_int);
- 160 json_object_put(my_object);
- 161 json_object_put(my_array);
- 162
- 163 return 0;
- 164 }
Makefile文件内容如下:
- 1 json_test:json_test.c
- 2 <span style="white-space:pre"> </span>gcc -g -D__STRICT_ANSI__ -ljson -I/usr/local/include/json/ -L/usr/local/lib/ json_test.c -o json_test
其中 -D__STRICT_ANSI__ 是为了消除c99的编译选项。
编译后执行结果如下:
my_string=
my_string.to_string()="\t"
my_string=\
my_string.to_string()="\\"
my_string=foo
my_string.to_string()="foo"
my_int=9
my_int.to_string()=9
my_array=
[0]=1
[1]=2
[2]=3
[3]=null
[4]=5
my_array.to_string()=[ 1, 2, 3, null, 5 ]
my_object=
abc: 12
foo: "bar"
bool0: false
bool1: true
my_object.to_string()={ "abc": 12, "foo": "bar", "bool0": false, "bool1": true }
new_obj.to_string()="\u0003"
new_obj.to_string()="foo"
new_obj.to_string()="foo"
new_obj.to_string()="ABC"
new_obj.to_string()=null
new_obj.to_string()=true
new_obj.to_string()=12
new_obj.to_string()=12.300000
new_obj.to_string()=[ "\n" ]
new_obj.to_string()=[ "\nabc\n" ]
new_obj.to_string()=[ null ]
new_obj.to_string()=[ ]
new_obj.to_string()=[ false ]
new_obj.to_string()=[ "abc", null, "def", 12 ]
new_obj.to_string()={ }
new_obj.to_string()={ "foo": "bar" }
new_obj.to_string()={ "foo": "bar", "baz": null, "bool0": true }
new_obj.to_string()={ "foo": [ null, "foo" ] }
new_obj.to_string()={ "abc": 12, "foo": "bar", "bool0": false, "bool1": true, "arr": [ 1, 2, 3, null, 5 ] }
got error as expected
got error as expected
got error as expected
new_obj.to_string()={ "foo": { "bar": 13 } }
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