如何对接jsoncpp?
参考：https://www.cnblogs.com/cuish/p/3888657.html
下载源码
https://sourceforge.net/projects/jsoncpp/files/latest/download
https://sourceforge.net/projects/scons/files/latest/download
解压
$ ls
jsoncpp-src-0.5.0
scons-2.3.4
编译脚本
cd jsoncpp-src-0.5.0
python ../scons-2.3.4/script/scons platform=linux-gcc
gccversion=`gcc --version | grep "^gcc"|awk '{print $3}'`
libPath=`echo "linux-gcc-"${gccversion}`
cp -rf include/* /usr/local/include
cp -f libs/${libPath}/*.a /usr/local/lib/libjson.a
cd -
写个demo测试
(这个是抄别人的,网上有,省的自己写了,而且人家的demo写的还挺好的,一眼就让人知道怎么用了)
#include <stdio.h>
#include <unistd.h>
#include <iostream>
#include <string>
#include <json/json.h>
using namespace std;
int main()
{
string strStudent = "{ \"name\" : \"cuishihao\", \"age\" : 28, \"major\" : \"cs\" }";
Json::Reader reader;
Json::Value value;
bool bRet = reader.parse(strStudent, value);
if (false == bRet)
{
cerr << endl << "read value error \n";
return -1;
}
cout << value["name"].asString()<<endl;
cout << value["age"].asInt()<<endl;
cout << value["major"].asString()<<endl;
cout << endl;
Json::Value json_temp;
json_temp["name"] = Json::Value("cuihao");
json_temp["age"] = Json::Value(28);
Json::Value root;
root["key_string"] = Json::Value("value_string");
root["key_number"] = Json::Value(12345);
root["key_boolean"] = Json::Value(true);
root["key_double"] = Json::Value(12.345);
root["key_object"] = json_temp;
root["key_array"].append("array_string1");
root["key_array"].append("array_string2");
root["key_array"].append(12345);
Json::ValueType type = root.type();
Json::Value arrValue = root["key_array"];
for (Json::Value::UInt i = 0; i < arrValue.size(); ++ i)
{
if (arrValue[i].isString())
cout << arrValue[i].asString();
else if (arrValue[i].isInt())
cout << arrValue[i].asInt();
cout << endl;
}
cout << endl << "----------------------------------- " <<endl;
string strTemp =
"{ \"name\" : \"cuihao\" ," \
" \"age\" : 28 }";
string strRoot =
"{ \"key_string\" : \"value_string\", " \
" \"key_number\" : 28, " \
" \"key_boolean\" : false, " \
" \"key_double\" : 12.345, " \
" \"key_object\" : json_temp, " \
" \"key_array\" : [\"array_string1\", \"array_string2\", 12345]}";
Json::StyledWriter writer;
cout << endl << writer.write(root) << endl;
cout << endl << "----------------------------"<<endl;
Json::Value::Members members = root.getMemberNames();
for(Json::Value::Members::const_iterator iter = members.begin();
iter != members.end();
++ iter)
{
string strName = *iter;
if (root[strName].isInt())
cout << root[strName].asInt();
else if (root[strName].isString())
cout << root[strName].asString();
else if (root[strName].isDouble())
cout << root[strName].asDouble();
else if(root[strName].isBool())
cout << root[strName].asBool();
else if(root[strName].isArray())
{
for(Json::Value::ArrayIndex i = 0; i < root[strName].size(); ++ i)
{
if(root[strName][i].isInt())
cout << root[strName][i].asInt();
else if(root[strName][i].isString())
cout << root[strName][i].asString();
else
cout << "others";
cout << endl;
}
}
else if (root[strName].isObject())
{
Json::Value::Members mbs = root[strName].getMemberNames();
for (Json::Value::Members::const_iterator iter2 = mbs.begin();
iter2 != mbs.end();
++ iter2)
{
string strName2 = *iter2;
if(root[strName][strName2].isInt())
cout << root[strName][strName2].asInt();
else if(root[strName][strName2].isString())
cout << root[strName][strName2].asString();
else
cout << "others";
cout << endl;
} //for
} //else if
else
cout << "others";
cout << endl;
}
return 0;
}
编译
g++ demo.cpp -I /usr/local/include/ -L/usr/local/lib/ -ljson -o demo
#或者
g++ demo.cpp -I /usr/local/include/ /usr/local/lib/libjson.a -o demo
运行
$ ./demo
cuishihao
28
cs
array_string1
array_string2
12345
-----------------------------------
{
"key_array" : [ "array_string1", "array_string2", 12345 ],
"key_boolean" : true,
"key_double" : 12.3450,
"key_number" : 12345,
"key_object" : {
"age" : 28,
"name" : "cuihao"
},
"key_string" : "value_string"
}
----------------------------
array_string1
array_string2
12345
1
12.345
12345
28
cuihao
value_string
如果集成过程中报错：
/usr/include/sys/cdefs.h:42:20: error: missing binary operator before token "("
# if __GNUC_PREREQ (4, 6) && !defined _LIBC
^
/usr/include/sys/cdefs.h:55:44: error: missing binary operator before token "("
# if !defined __cplusplus && __GNUC_PREREQ (3, 3)
^
/usr/include/sys/cdefs.h:60:44: error: missing binary operator before token "("
# if defined __cplusplus && __GNUC_PREREQ (2,8)
^
/usr/include/sys/cdefs.h:144:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (4,3)
^
/usr/include/sys/cdefs.h:157:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (2,97)
^
/usr/include/sys/cdefs.h:219:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (2,96)
^
/usr/include/sys/cdefs.h:228:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (2,96)
^
/usr/include/sys/cdefs.h:235:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (2,5)
^
/usr/include/sys/cdefs.h:244:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (3,1)
^
/usr/include/sys/cdefs.h:253:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (3,2)
^
/usr/include/sys/cdefs.h:265:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (2,8)
^
/usr/include/sys/cdefs.h:275:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (2,97)
^
/usr/include/sys/cdefs.h:284:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (3,3)
^
/usr/include/sys/cdefs.h:292:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (3,4)
^
/usr/include/sys/cdefs.h:306:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (3,2)
^
/usr/include/sys/cdefs.h:314:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (4,3)
^
/usr/include/sys/cdefs.h:329:44: error: missing binary operator before token "("
#if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
^
/usr/include/sys/cdefs.h:348:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (4,3)
^
/usr/include/sys/cdefs.h:357:20: error: missing binary operator before token "("
#if !__GNUC_PREREQ (2,8)
^
/usr/include/sys/cdefs.h:362:20: error: missing binary operator before token "("
#if !__GNUC_PREREQ (2,92)
^
/usr/include/sys/cdefs.h:369:19: error: missing binary operator before token "("
#if __GNUC_PREREQ (3,1) && !defined __GNUG__
^
In file included from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/c++config.h:2097:0,
from /usr/include/c++/4.8.2/iostream:38,
from ../../source/Main.cpp:16:
/usr/include/c++/4.8.2/x86_64-redhat-linux/bits/os_defines.h:44:19: error: missing binary operator before token "("
#if __GLIBC_PREREQ(2,15) && defined(_GNU_SOURCE)
^
In file included from /usr/include/c++/4.8.2/cwchar:44:0,
from /usr/include/c++/4.8.2/bits/postypes.h:40,
from /usr/include/c++/4.8.2/iosfwd:40,
from /usr/include/c++/4.8.2/ios:38,
from /usr/include/c++/4.8.2/ostream:38,
from /usr/include/c++/4.8.2/iostream:39,
from ../../source/Main.cpp:16:
/usr/include/wchar.h:74:43: error: missing binary operator before token "("
# if defined __cplusplus && __GNUC_PREREQ (4, 4)
^
In file included from /usr/include/sched.h:42:0,
from /usr/include/pthread.h:23,
from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/gthr-default.h:35,
from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/gthr.h:148,
from /usr/include/c++/4.8.2/ext/atomicity.h:35,
from /usr/include/c++/4.8.2/bits/ios_base.h:39,
from /usr/include/c++/4.8.2/ios:42,
from /usr/include/c++/4.8.2/ostream:38,
from /usr/include/c++/4.8.2/iostream:39,
from ../../source/Main.cpp:16:
/usr/include/bits/sched.h:132:20: error: missing binary operator before token "("
# if __GNUC_PREREQ (2, 91)
^
/usr/include/bits/sched.h:170:20: error: missing binary operator before token "("
# if __GNUC_PREREQ (2, 91)
^
In file included from ../../source/Main.cpp:22:0:
/usr/include/string.h:35:42: error: missing binary operator before token "("
#if defined __cplusplus && __GNUC_PREREQ (4, 4)
^
那就说明在编译指定include目录时，把json包进去了。比如"-I include/json",因为在头文件引用过程中写的是#include"json/json.h",其实没必要包含json文件夹的。
解决方法编译时改为"-I include"即可。当然，不要觉得多多益善，如果两个目录都包含，文件冲突了，仍然会报上面的错误。
原文链接: https://www.cnblogs.com/bugutian/p/13214295.html
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