在使用poco version 1.6.0时 Poco::JSON::Array 在object 设置preserveInsertionOrder =true 时
调用 array.stringify出错.
在使用poco::json 输出字符串
std::string str1 = "\r"; std::string str2 = "\n"; Poco::JSON::Object obj1, obj2; obj1.set("payload", str1); obj2.set("payload", str2); std::ostringstream oss1, oss2; Poco::JSON::Stringifier::stringify(obj1, oss1); Poco::JSON::Stringifier::stringify(obj2, oss2); string srxxx=oss1.str()//正常输出...
poco::json::array 输出 字符串:
Object jObj2(true); std::string strValue2="[{\"backspace1\":\"bs2222\",\"1backspace1\":\"1bs2222\"},{\"te1\":\"t1\",\"t2\":\"t2\"}]"; jObj2.set("car", "这是中文abc@qwe.com1231"); jObj2.set("baz", "fas"); std::stringstream ss2222; jObj2.stringify(ss2222); strxxx.clear(); strxxx=CMyCodeConvert::Gb2312ToUtf8(ss2222.str());//gbk->utf8 Object jObj3(true); jObj3.set("5", "2"); jObj3.set("2", "2"); Object jObj4(false); jObj4.set("51", "2"); jObj4.set("21", "2"); Poco::JSON::Array array1; //array1.add(resultxxx); array1.add(jObj2); array1.add(jObj3); array1.add(jObj4); //jObj.set("arrar",array1); std::stringstream ssArray1; Stringifier::stringify(array1,ssArray1); //array1.stringify(ssArray1); std::string strArray1=ssArray1.str();//->>>>>>输出字符串出错.
but run time is error
追踪代码发现:
\JSON\src\Object.cpp:
Object(bool preserveInsertionOrder = false); //在map 中排序 ,输出时按字母大小顺序.
/// Default constructor. If preserveInsertionOrder, object
/// will preserve the items insertion order. Otherwise, items
/// will be sorted by keys.
preserveInsertionOrder = false 这个我比较反感,因为之前用jsoncpp 处理 某些东东时,因为输出时入 输入的json顺序不 一致 走了不少弯路.
所以 preserveInsertionOrder = true 是我的爱 .
Stringifier::stringify(array1,ssArray1);
----->
JSON\src\Stringifier.cpp:
else if ( any.type() == typeid(Array) )
{
const Array& a = any.extract<Array>();
a.stringify(out, indent == 0 ? 0 : indent, step);
}
--->
if ( any.type() == typeid(Object) )
{
const Object& o = any.extract<Object>();
o.stringify(out, indent == 0 ? 0 : indent, step);
}
--->
\JSON\src\Object.cpp:
void Object::stringify(std::ostream& out, unsigned int indent, int step) const
{
if (step < 0) step = indent;
if(!_preserveInsOrder)
doStringify(_values, out, indent, step); // 不用代码添加顺序 ,则使用map窗口..jsoncpp也是map
else
doStringify(_keys, out, indent, step);//保留原有代码添加顺序, 则使用 std::deque<Dynamic::Var*> KeyPtrList
}
--->
\Poco\JSON\Object.h
template <typename C>
void doStringify(const C& container, std::ostream& out, unsigned int indent, unsigned int step) const
{
....
Stringifier::stringify(getKey(it), out); //这儿 getKey(it), 出了问题
out << ((indent > 0) ? " : " : ":");
Stringifier::stringify(getValue(it), out, indent + step, step);
...
}
\JSON\src\Object.cpp:
const std::string& Object::getKey(KeyPtrList::const_iterator& iter) const
{
ValueMap::const_iterator it = _values.begin();
ValueMap::const_iterator end = _values.end();
for (; it != end; ++it)
{
if (it->second == **iter) return it->first;
}
throw NotFoundException((*iter)->convert<std::string>()); //----->这儿报错
}
--->
Object.cpp中:
void Object::set(const std::string& key, const Dynamic::Var& value)
{
_values[key] = value;
if (_preserveInsOrder)
{
KeyPtrList::iterator it = _keys.begin();
KeyPtrList::iterator end = _keys.end();
for (; it != end; ++it)
{
if (key == **it) return;
}
_keys.push_back(&_values[key]); //->这儿的内存地址发生了变化.
}
}
示例代码中:
array1.add(jObj2); -->Object 转到 (const Dynamic::Var& value)时
Foundation\include\Poco\Dynamic\Var.h:
Var(const T& val)
/// Creates the Var from the given value.
#ifdef POCO_NO_SOO
: _pHolder(new VarHolderImpl<T>(val)) --->>>发生了拷贝所以内存地址变化了.
{
}
后面在 https://github.com/pocoproject/poco/commit/3553a86d608321c1a06262c721aa766f1808cf2c
作者说
const std::string& Object::getKey(KeyPtrList::const_iterator& iter) const 中
if (&it->second == *iter) return it->first;
改成
if (it->second == **iter) return it->first;
注意 这个==是
poco开发版本地址:
https://github.com/pocoproject/poco/blob/develop/JSON/include/Poco/JSON/Object.h
https://github.com/pocoproject/poco/blob/develop/JSON/src/Object.cpp
以下只贴出了 重要更新的代码.
// // Object.h
如果是vs08的环境:
inline const Dynamic::Var& Object::getValue(KeyPtrList::const_iterator& it) const
{
return _values.at(**it); //map.at 是C++ 11的标准,这儿不支持.
}
改成:
inline const Dynamic::Var& Object::getValue(KeyPtrList::const_iterator& it) const
{
const std::string & strKey=**it;
ValueMap ::const_iterator iter = _values.find(strKey);
if(iter!=_values.end())
return iter->second;
throw NotFoundException(strKey);
}
// // Object.cpp // // $Id$ ............ void Object::stringify(std::ostream& out, unsigned int indent, int step) const { if (step < 0) step = indent; if(!_preserveInsOrder) doStringify(_values, out, indent, step); else doStringify(_keys, out, indent, step); } const std::string& Object::getKey(KeyPtrList::const_iterator& iter) const { ValueMap::const_iterator it = _values.begin(); ValueMap::const_iterator end = _values.end(); for (; it != end; ++it) { if (it->first == **iter) return it->first; } throw NotFoundException(**iter); } void Object::set(const std::string& key, const Dynamic::Var& value) { std::pair<ValueMap::iterator, bool> ret = _values.insert(ValueMap::value_type(key, value)); if (_preserveInsOrder) { KeyPtrList::iterator it = _keys.begin(); KeyPtrList::iterator end = _keys.end(); for (; it != end; ++it) { if (key == **it) return; } _keys.push_back(&ret.first->first); } }
测试结果:
Object jObj2(true);//-------->use preserveInsertionOrder=true jObj2.set("car", "这是中文abc@qwe.com1231"); jObj2.set("baz", "fas"); jObj2.set("baz1", "fas"); jObj2.set("1baz11", "fas"); Poco::JSON::Array array1; array1.add(jObj2); std::ostringstream oss122; array1.stringify(oss122); std::string fdsafsa=oss122.str(); std::cout<<"array1="<<fdsafsa<<std::endl; //输出:[{"car":"这是中文abc@qwe.com1231","baz":"fas","baz1":"fas","1baz11":"fas"}]
本以为到这儿就已经结束了....
然而我错了...
上篇附笔中:
poco json 中文字符，抛异常JSON Exception -->iconv 转换 备忘录。
http://www.cnblogs.com/bleachli/p/4646092.html
中的 suite()作下改变:
std::string suite() { std::string json = ""; //"{" //"\"id\": 1123," //"\"jsonrpc\": \" 123.abc@hello.com,大圣归来.. \"," //"\"total\": 2," //"\"result\": " //"[" //"{" //"\"id\": null," //"\"picture\": \"http://placehold.it/32x32\"," //"\"name\": \"这是中文测试.Crossman\"," //"\"about\": \"《西游记之大圣归来》是根据中国传统神话故事进行拓展和演绎的3D动画电影.xxxx Consectetuer suscipit volutpat eros dolor .\"," //"\"friends\": " //"[" //"{" //"}," //"{" //"\"id\": 2," //"\"name\": \"Bailey Oldridge2\"" //"}," //"{" //"\"id\": 3," //"\"name\": \"Makayla Campbell3\"" //"}" //"]" //"}," //"{" //"\"id\": 2," //"\"picture\": \"http://placehold.it/32x32\"," //"\"name\": \"2中名 欢迎 \"," //"\"about\": \"2北京你好 dolor .\"," //"\"friends\": " //"[" //"]" //"}" //"]" //"}"; std::string strUtf8=GetJsonSource(true); Parser parser; Var result; try { result = parser.parse(strUtf8);//json转换... } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; return "result==NULL"; } Object::Ptr object = result.extract<Object::Ptr>(); int nObjectSize=object->size(); //assert(object->size() > 0); DynamicStruct ds = *object; //遍历... for(DynamicStruct::Iterator itBegin=ds.begin();itBegin!=ds.end();itBegin++) { //std::string strvalue=itBegin; //Var var= itBegin->second; //std::cout<<"type:"<<var.type()<<std::endl; std::cout<<"K:" << itBegin->first << " , value: " <<CMyCodeConvert::Utf8ToGb2312( itBegin->second.toString()) << std::endl; } std::cout<<std::endl<<std::endl<<std::endl; std::cout<<"+++++++++++++++++++++++++++++++++++++++++++++++++++"<<std::endl; json=""; std::string strlation1xxxx; std::string strjstostring=strUtf8; std::string strTemp; std::string strKey; //std::string strKey="id"; //key 是否存在 strKey="id"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; } strKey="id2232"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; } strKey="jsonrpc"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; std::string strxxx; std::cout<<"jsonrpc 编码:"<<std::endl; std::string strxxxx=strTemp; for(int nxxx=0;nxxx<strxxxx.size();++nxxx) { unsigned char chTemp=strxxxx[nxxx]; std::string strTemp=Poco::format("%hX",(unsigned short )chTemp); strTemp+=" "; //std::cout<<strTemp; } std::cout<<std::endl; //strjstostring+=strTemp; std::cout<<"object333->get("<<strKey<<")="<<strTemp<<std::endl; } strKey="total"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; } strKey="result"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; Var vResult=object->get("result"); Poco::JSON::Array::Ptr arrayResult = object->getArray("result"); Poco::JSON::Array::Ptr arr22222 = vResult.extract<Poco::JSON::Array::Ptr>(); Poco::Dynamic::Array dsarrayResult = *arrayResult; std::cout<<"arr22222->size()"<<arr22222->size()<<std::endl; std::cout<<"arrayResult->size()"<<arrayResult->size()<<std::endl; std::cout<<"arrayResult->size()"<<dsarrayResult.size()<<std::endl; for(int nIndex=0;nIndex<arrayResult->size();++nIndex) { Object::Ptr object = arrayResult->getObject(nIndex); strKey="id"; if(object->has(strKey)) { strTemp=""; if(!object->get(strKey).isEmpty()) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; } } strKey="picture"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; } strKey="name"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; } strKey="about"; if(object->has(strKey)) { strTemp=CMyCodeConvert::Utf8ToGb2312( object->get(strKey).toString()); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; } strKey="friends"; if(object->has(strKey)) { strTemp=object->get(strKey).toString(); std::cout<<"object->get("<<strKey<<")="<<strTemp<<std::endl; Poco::JSON::Array::Ptr arrayFriends = object->getArray(strKey); for(int nIndex=0;nIndex<arrayFriends->size();++nIndex) { Object::Ptr objectFriends = arrayFriends->getObject(nIndex); DynamicStruct dsTemp = *objectFriends; for(DynamicStruct::Iterator itBegin=dsTemp.begin();itBegin!=dsTemp.end();itBegin++) { std::cout<<"K:" << itBegin->first << " , value: " << CMyCodeConvert::Utf8ToGb2312(itBegin->second.toString() )<< std::endl; } } } std::cout<<std::endl<<std::endl<<std::endl; std::cout<<"+++++++++++++++++++++++++++++++++++++++++++++++++++"<<std::endl; std::cout<<std::endl<<std::endl<<std::endl; } } return strjstostring; }
GetJsonSource()代码:
std::string GetJsonSource(bool bUtf8) { bool bIspreserveInsertionOrder=true; Object jObjRoot(bIspreserveInsertionOrder);//-------->use preserveInsertionOrder=true jObjRoot.set("id", 1123); jObjRoot.set("car", ("这是中文abc@qwe.com1231,123.abc@hello.com,大圣归来..") ); jObjRoot.set("total", 2); Poco::JSON::Array arrayResult; for(int nIndex=0;nIndex<2;nIndex++) { Object jArrayObj(bIspreserveInsertionOrder); jArrayObj.set("id", nIndex); jArrayObj.set("picture",("http://placehold.it/111.abc.") ); jArrayObj.set("name",("这是中文测试.Crossman.") ); jArrayObj.set("about",("《西游记之大圣归来》是根据中国传统神话故事进行拓展和演绎的3D动画电影.xxxx Consectetuer suscipit volutpat eros dolor .") ); Poco::JSON::Array arrayFriends; for(int i=0;i<5;++i) { Object jarrayFriendsObj(bIspreserveInsertionOrder); jarrayFriendsObj.set("id", i); jarrayFriendsObj.set("name", (Poco::format("name%d,这是无可奈何花落去!",i))); arrayFriends.add(jarrayFriendsObj); } jArrayObj.set("friends",arrayFriends); arrayResult.add(jArrayObj); } jObjRoot.set("result",arrayResult); std::string strObjRoot; std::ostringstream ojObjRoot; // //bIspreserveInsertionOrder =false时程序正常运行. //bIspreserveInsertionOrder =true 时程序出错 //Poco\JSON\Object.cpp //const std::string& Object::getKey(KeyPtrList::const_iterator& iter) const //iter is null. //产生memcpy 错误.. // jObjRoot.stringify(ojObjRoot);// strObjRoot=ojObjRoot.str(); if(bUtf8) strObjRoot=CMyCodeConvert::Gb2312ToUtf8(strObjRoot); //std::string strGbkTemp=CMyCodeConvert::Utf8ToGb2312(strObjRoot); return strObjRoot; }
原因是
typedef std::deque<const std::string*> KeyPtrList; 这儿是指针地址,临时变量内容已经over了.
so...再改改代码:
poco\JSON\include\Poco\JSON\Object.h 改动部分
typedef std::deque< std::string> KeyPtrList; inline const Dynamic::Var& Object::getValue(KeyPtrList::const_iterator& it) const { const std::string & strKey=*it; ValueMap ::const_iterator iter = _values.find(strKey); if(iter!=_values.end()) return iter->second; throw NotFoundException(strKey); }
poco\JSON\src\Object.cpp 中改动部分:
const std::string& Object::getKey(KeyPtrList::const_iterator& iter) const { ValueMap::const_iterator it = _values.begin(); ValueMap::const_iterator end = _values.end(); for (; it != end; ++it) { if (it->first == *iter) return it->first; } throw NotFoundException(*iter); } void Object::set(const std::string& key, const Dynamic::Var& value) { std::pair<ValueMap::iterator, bool> ret = _values.insert(ValueMap::value_type(key, value)); if (_preserveInsOrder) { KeyPtrList::iterator it = _keys.begin(); KeyPtrList::iterator end = _keys.end(); for (; it != end; ++it) { if (key == *it) return; } _keys.push_back(ret.first->first); } }
GetJsonSource()输出的结果可在 http://www.bejson.com/ 中校验.
-_- 终于成功了...
把代码在debian下编译看下 通过http访问结果:
然而作者又回复了我:
Don't nest objects and arrays by value, it won't work properly - use smart pointers (Object::Ptr and Array::Ptr). See this issue for explanation.
object.h,object.cpp还是用作者的code.
poco开发版本地址:
https://github.com/pocoproject/poco/blob/develop/JSON/include/Poco/JSON/Object.h
https://github.com/pocoproject/poco/blob/develop/JSON/src/Object.cpp
然后测试代码如下:
std::string GetJsonSource(bool bUtf8) { bool bIspreserveInsertionOrder=true; //Object result(bIspreserveInsertionOrder);//-------->use preserveInsertionOrder=true //result.set("id", 1123); //Poco::JSON::Object::Ptr inner= new Poco::JSON::Object(bIspreserveInsertionOrder) ; //inner->set("some_number", 5); //inner->set("some_string", "xyz"); //std::string key = "new_object"; //result.set(key, inner); // OK ////assert (result.isObject()); // OK // //std::string strOxxxxx; //std::ostringstream oxxxxx; //result.stringify(oxxxxx);// //strOxxxxx=oxxxxx.str(); //return ""; Object jObjRoot(bIspreserveInsertionOrder);//-------->use preserveInsertionOrder=true jObjRoot.set("id", 1123); jObjRoot.set("car", ("这是中文abc@qwe.com1231,123.abc@hello.com,大圣归来..") ); jObjRoot.set("total", 2); //Poco::JSON::Array arrayResult; Poco::JSON::Array::Ptr parrayResult= new Poco::JSON::Array() ; for(int nIndex=0;nIndex<2;nIndex++) { Poco::JSON::Object::Ptr pjArrayObj= new Poco::JSON::Object(bIspreserveInsertionOrder) ; //Object jArrayObj(bIspreserveInsertionOrder); pjArrayObj->set("id", nIndex); pjArrayObj->set("picture",("http://placehold.it/111.abc.") ); pjArrayObj->set("name",("这是中文测试.Crossman.") ); pjArrayObj->set("about",("《西游记之大圣归来》是根据中国传统神话故事进行拓展和演绎的3D动画电影.xxxx Consectetuer suscipit volutpat eros dolor .") ); Poco::JSON::Array::Ptr parrayFriends= new Poco::JSON::Array() ; //Poco::JSON::Array arrayFriends; for(int i=0;i<5;++i) { Poco::JSON::Object::Ptr pjarrayFriendsObj= new Poco::JSON::Object(bIspreserveInsertionOrder) ; //Object jarrayFriendsObj(bIspreserveInsertionOrder); pjarrayFriendsObj->set("id", i); pjarrayFriendsObj->set("name", (Poco::format("name%d,这是无可奈何花落去!",i))); parrayFriends->add(pjarrayFriendsObj); } pjArrayObj->set("friends",parrayFriends); parrayResult->add(pjArrayObj); } jObjRoot.set("result",parrayResult); std::string strObjRoot; std::ostringstream ojObjRoot; //// jObjRoot.stringify(ojObjRoot);// strObjRoot=ojObjRoot.str(); if(bUtf8) strObjRoot=CMyCodeConvert::Gb2312ToUtf8(strObjRoot); //std::string strGbkTemp=CMyCodeConvert::Utf8ToGb2312(strObjRoot); return strObjRoot; }
这个问题终于得到解决...