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Add values to map using rapidjson
0
I get a raw json string
{"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}}
from a get call i make.
I read that rapidjson is the best way to parse a json string in cpp.
So I tried doing something like this:
const char* json = data.c_str();
rapidjson::Document document;
if (document.Parse(json).HasParseError()) {
cout << "has parse error" << endl;
return 1;
}
else {
assert(document.IsObject());
}
Here it says that the json has a parse error. Any idea why this could be?
Also once I am able to parse the values I want to add them as key value pairs to a standard map. Could anyone point me in the right direction to proceed with this?
c++ json stdmap rapidjson
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
add a comment |
0
I get a raw json string
{"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}}
from a get call i make.
I read that rapidjson is the best way to parse a json string in cpp.
So I tried doing something like this:
const char* json = data.c_str();
rapidjson::Document document;
if (document.Parse(json).HasParseError()) {
cout << "has parse error" << endl;
return 1;
}
else {
assert(document.IsObject());
}
Here it says that the json has a parse error. Any idea why this could be?
Also once I am able to parse the values I want to add them as key value pairs to a standard map. Could anyone point me in the right direction to proceed with this?
c++ json stdmap rapidjson
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
RapidJSON allows you to check what the error is. Have you tried looking at the specific error code? The list is pretty extensive: rapidjson.org/md_doc_dom.html#ParseError
– ahota
Nov 19 '18 at 21:35
As far as the map is concerned, I've been working on something similar recently. The closest I found to a true JSON (and Python dictionary) is anstd::unordered_mapwith a key typestd::stringand a value type ofstd::variant<>, where the variant could be int, float, string, vector, etc.std::variantrequires C++17, though.
– ahota
Nov 19 '18 at 21:39
@ahota the error says "invalid values". Although i suspect this could be because I am converting a standard string to const char*? Also i am restricted to cpp 11
– hal9000
Nov 19 '18 at 21:47
add a comment |
0
0
0
I get a raw json string
{"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}}
from a get call i make.
I read that rapidjson is the best way to parse a json string in cpp.
So I tried doing something like this:
const char* json = data.c_str();
rapidjson::Document document;
if (document.Parse(json).HasParseError()) {
cout << "has parse error" << endl;
return 1;
}
else {
assert(document.IsObject());
}
Here it says that the json has a parse error. Any idea why this could be?
Also once I am able to parse the values I want to add them as key value pairs to a standard map. Could anyone point me in the right direction to proceed with this?
c++ json stdmap rapidjson
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
I get a raw json string
{"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}}
from a get call i make.
I read that rapidjson is the best way to parse a json string in cpp.
So I tried doing something like this:
const char* json = data.c_str();
rapidjson::Document document;
if (document.Parse(json).HasParseError()) {
cout << "has parse error" << endl;
return 1;
}
else {
assert(document.IsObject());
}
Here it says that the json has a parse error. Any idea why this could be?
Also once I am able to parse the values I want to add them as key value pairs to a standard map. Could anyone point me in the right direction to proceed with this?
c++ json stdmap rapidjson
c++ json stdmap rapidjson
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
asked Nov 19 '18 at 21:18
hal9000hal9000
64112
64112
RapidJSON allows you to check what the error is. Have you tried looking at the specific error code? The list is pretty extensive: rapidjson.org/md_doc_dom.html#ParseError
– ahota
Nov 19 '18 at 21:35
As far as the map is concerned, I've been working on something similar recently. The closest I found to a true JSON (and Python dictionary) is anstd::unordered_mapwith a key typestd::stringand a value type ofstd::variant<>, where the variant could be int, float, string, vector, etc.std::variantrequires C++17, though.
– ahota
Nov 19 '18 at 21:39
@ahota the error says "invalid values". Although i suspect this could be because I am converting a standard string to const char*? Also i am restricted to cpp 11
– hal9000
Nov 19 '18 at 21:47
add a comment |
RapidJSON allows you to check what the error is. Have you tried looking at the specific error code? The list is pretty extensive: rapidjson.org/md_doc_dom.html#ParseError
– ahota
Nov 19 '18 at 21:35
As far as the map is concerned, I've been working on something similar recently. The closest I found to a true JSON (and Python dictionary) is anstd::unordered_mapwith a key typestd::stringand a value type ofstd::variant<>, where the variant could be int, float, string, vector, etc.std::variantrequires C++17, though.
– ahota
Nov 19 '18 at 21:39
@ahota the error says "invalid values". Although i suspect this could be because I am converting a standard string to const char*? Also i am restricted to cpp 11
– hal9000
Nov 19 '18 at 21:47
RapidJSON allows you to check what the error is. Have you tried looking at the specific error code? The list is pretty extensive: rapidjson.org/md_doc_dom.html#ParseError
– ahota
Nov 19 '18 at 21:35
RapidJSON allows you to check what the error is. Have you tried looking at the specific error code? The list is pretty extensive: rapidjson.org/md_doc_dom.html#ParseError
– ahota
Nov 19 '18 at 21:35
As far as the map is concerned, I've been working on something similar recently. The closest I found to a true JSON (and Python dictionary) is an
std::unordered_map with a key type std::string and a value type of std::variant<>, where the variant could be int, float, string, vector, etc. std::variant requires C++17, though.– ahota
Nov 19 '18 at 21:39
As far as the map is concerned, I've been working on something similar recently. The closest I found to a true JSON (and Python dictionary) is an
std::unordered_map with a key type std::string and a value type of std::variant<>, where the variant could be int, float, string, vector, etc. std::variant requires C++17, though.– ahota
Nov 19 '18 at 21:39
@ahota the error says "invalid values". Although i suspect this could be because I am converting a standard string to const char*? Also i am restricted to cpp 11
– hal9000
Nov 19 '18 at 21:47
@ahota the error says "invalid values". Although i suspect this could be because I am converting a standard string to const char*? Also i am restricted to cpp 11
– hal9000
Nov 19 '18 at 21:47
add a comment |
1 Answer
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This gave me no error:
#include <iostream>
#include "rapidjson/document.h"
#include "rapidjson/error/en.h"
using namespace rapidjson;
int main() {
Document d;
std::string json = R"raw({"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}})raw";
if (d.Parse(json.c_str()).HasParseError()) {
std::cout << "has errorn";
} else {
std::cout << "no errorn";
}
}
Tried C++11 - C++20 and it all seems fine. My guess is that you've got some non UTF8 character in the data.
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
Oh nice this worked for me too. I there a significance to the R and the prefixed and suffixed raw here? Thing is, I get the json string from a get call. {"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}} I don't actually have this in the code. can I append R or "raw" like we do in java? I am kinda cpp newbie so out of my depth here.
– hal9000
Nov 19 '18 at 22:07
TheR"delimiter( raw_characters )delimiter"only does you good with string literals so my guess is that you've got some non UTF8 character in the data but it's hard to say. But at least you know the parser is working. The string you get, can you save it in binary mode to a file and then perhaps validate it so that it is UTF8 encoded?
– Ted Lyngmo
Nov 19 '18 at 22:18
That was it! I was being rather stupid and returning VERBOSE and HEADER in libcurl get call. With just the JSON string in the body it works correctly!
– hal9000
Nov 19 '18 at 22:50
Have you ever played around with pulling out the the json key value pairs? Trying to figure out a way to iterate them into a standard map.
– hal9000
Nov 19 '18 at 22:51
Great! Sorry to say, I have very little experience with rapidjson. I settled with JSON for Modern C++ eventually but I don't know how to do that there either. I've only been doing very basic stuff with it.
– Ted Lyngmo
Nov 19 '18 at 23:22
add a comment |
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This gave me no error:
#include <iostream>
#include "rapidjson/document.h"
#include "rapidjson/error/en.h"
using namespace rapidjson;
int main() {
Document d;
std::string json = R"raw({"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}})raw";
if (d.Parse(json.c_str()).HasParseError()) {
std::cout << "has errorn";
} else {
std::cout << "no errorn";
}
}
Tried C++11 - C++20 and it all seems fine. My guess is that you've got some non UTF8 character in the data.
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
Oh nice this worked for me too. I there a significance to the R and the prefixed and suffixed raw here? Thing is, I get the json string from a get call. {"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}} I don't actually have this in the code. can I append R or "raw" like we do in java? I am kinda cpp newbie so out of my depth here.
– hal9000
Nov 19 '18 at 22:07
TheR"delimiter( raw_characters )delimiter"only does you good with string literals so my guess is that you've got some non UTF8 character in the data but it's hard to say. But at least you know the parser is working. The string you get, can you save it in binary mode to a file and then perhaps validate it so that it is UTF8 encoded?
– Ted Lyngmo
Nov 19 '18 at 22:18
That was it! I was being rather stupid and returning VERBOSE and HEADER in libcurl get call. With just the JSON string in the body it works correctly!
– hal9000
Nov 19 '18 at 22:50
Have you ever played around with pulling out the the json key value pairs? Trying to figure out a way to iterate them into a standard map.
– hal9000
Nov 19 '18 at 22:51
Great! Sorry to say, I have very little experience with rapidjson. I settled with JSON for Modern C++ eventually but I don't know how to do that there either. I've only been doing very basic stuff with it.
– Ted Lyngmo
Nov 19 '18 at 23:22
add a comment |
1
This gave me no error:
#include <iostream>
#include "rapidjson/document.h"
#include "rapidjson/error/en.h"
using namespace rapidjson;
int main() {
Document d;
std::string json = R"raw({"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}})raw";
if (d.Parse(json.c_str()).HasParseError()) {
std::cout << "has errorn";
} else {
std::cout << "no errorn";
}
}
Tried C++11 - C++20 and it all seems fine. My guess is that you've got some non UTF8 character in the data.
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
Oh nice this worked for me too. I there a significance to the R and the prefixed and suffixed raw here? Thing is, I get the json string from a get call. {"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}} I don't actually have this in the code. can I append R or "raw" like we do in java? I am kinda cpp newbie so out of my depth here.
– hal9000
Nov 19 '18 at 22:07
TheR"delimiter( raw_characters )delimiter"only does you good with string literals so my guess is that you've got some non UTF8 character in the data but it's hard to say. But at least you know the parser is working. The string you get, can you save it in binary mode to a file and then perhaps validate it so that it is UTF8 encoded?
– Ted Lyngmo
Nov 19 '18 at 22:18
That was it! I was being rather stupid and returning VERBOSE and HEADER in libcurl get call. With just the JSON string in the body it works correctly!
– hal9000
Nov 19 '18 at 22:50
Have you ever played around with pulling out the the json key value pairs? Trying to figure out a way to iterate them into a standard map.
– hal9000
Nov 19 '18 at 22:51
Great! Sorry to say, I have very little experience with rapidjson. I settled with JSON for Modern C++ eventually but I don't know how to do that there either. I've only been doing very basic stuff with it.
– Ted Lyngmo
Nov 19 '18 at 23:22
add a comment |
1
1
1
This gave me no error:
#include <iostream>
#include "rapidjson/document.h"
#include "rapidjson/error/en.h"
using namespace rapidjson;
int main() {
Document d;
std::string json = R"raw({"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}})raw";
if (d.Parse(json.c_str()).HasParseError()) {
std::cout << "has errorn";
} else {
std::cout << "no errorn";
}
}
Tried C++11 - C++20 and it all seems fine. My guess is that you've got some non UTF8 character in the data.
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
This gave me no error:
#include <iostream>
#include "rapidjson/document.h"
#include "rapidjson/error/en.h"
using namespace rapidjson;
int main() {
Document d;
std::string json = R"raw({"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}})raw";
if (d.Parse(json.c_str()).HasParseError()) {
std::cout << "has errorn";
} else {
std::cout << "no errorn";
}
}
Tried C++11 - C++20 and it all seems fine. My guess is that you've got some non UTF8 character in the data.
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
edited Nov 19 '18 at 23:23
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
answered Nov 19 '18 at 21:53
Ted LyngmoTed Lyngmo
2,0621317
2,0621317
Oh nice this worked for me too. I there a significance to the R and the prefixed and suffixed raw here? Thing is, I get the json string from a get call. {"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}} I don't actually have this in the code. can I append R or "raw" like we do in java? I am kinda cpp newbie so out of my depth here.
– hal9000
Nov 19 '18 at 22:07
TheR"delimiter( raw_characters )delimiter"only does you good with string literals so my guess is that you've got some non UTF8 character in the data but it's hard to say. But at least you know the parser is working. The string you get, can you save it in binary mode to a file and then perhaps validate it so that it is UTF8 encoded?
– Ted Lyngmo
Nov 19 '18 at 22:18
That was it! I was being rather stupid and returning VERBOSE and HEADER in libcurl get call. With just the JSON string in the body it works correctly!
– hal9000
Nov 19 '18 at 22:50
Have you ever played around with pulling out the the json key value pairs? Trying to figure out a way to iterate them into a standard map.
– hal9000
Nov 19 '18 at 22:51
Great! Sorry to say, I have very little experience with rapidjson. I settled with JSON for Modern C++ eventually but I don't know how to do that there either. I've only been doing very basic stuff with it.
– Ted Lyngmo
Nov 19 '18 at 23:22
add a comment |
Oh nice this worked for me too. I there a significance to the R and the prefixed and suffixed raw here? Thing is, I get the json string from a get call. {"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}} I don't actually have this in the code. can I append R or "raw" like we do in java? I am kinda cpp newbie so out of my depth here.
– hal9000
Nov 19 '18 at 22:07
TheR"delimiter( raw_characters )delimiter"only does you good with string literals so my guess is that you've got some non UTF8 character in the data but it's hard to say. But at least you know the parser is working. The string you get, can you save it in binary mode to a file and then perhaps validate it so that it is UTF8 encoded?
– Ted Lyngmo
Nov 19 '18 at 22:18
That was it! I was being rather stupid and returning VERBOSE and HEADER in libcurl get call. With just the JSON string in the body it works correctly!
– hal9000
Nov 19 '18 at 22:50
Have you ever played around with pulling out the the json key value pairs? Trying to figure out a way to iterate them into a standard map.
– hal9000
Nov 19 '18 at 22:51
Great! Sorry to say, I have very little experience with rapidjson. I settled with JSON for Modern C++ eventually but I don't know how to do that there either. I've only been doing very basic stuff with it.
– Ted Lyngmo
Nov 19 '18 at 23:22
Oh nice this worked for me too. I there a significance to the R and the prefixed and suffixed raw here? Thing is, I get the json string from a get call. {"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}} I don't actually have this in the code. can I append R or "raw" like we do in java? I am kinda cpp newbie so out of my depth here.
– hal9000
Nov 19 '18 at 22:07
Oh nice this worked for me too. I there a significance to the R and the prefixed and suffixed raw here? Thing is, I get the json string from a get call. {"vehicle": {"brand": "zonda","color": "blue"},"username": {"brand": "doyota","color": "red"}} I don't actually have this in the code. can I append R or "raw" like we do in java? I am kinda cpp newbie so out of my depth here.
– hal9000
Nov 19 '18 at 22:07
The
R"delimiter( raw_characters )delimiter" only does you good with string literals so my guess is that you've got some non UTF8 character in the data but it's hard to say. But at least you know the parser is working. The string you get, can you save it in binary mode to a file and then perhaps validate it so that it is UTF8 encoded?– Ted Lyngmo
Nov 19 '18 at 22:18
The
R"delimiter( raw_characters )delimiter" only does you good with string literals so my guess is that you've got some non UTF8 character in the data but it's hard to say. But at least you know the parser is working. The string you get, can you save it in binary mode to a file and then perhaps validate it so that it is UTF8 encoded?– Ted Lyngmo
Nov 19 '18 at 22:18
That was it! I was being rather stupid and returning VERBOSE and HEADER in libcurl get call. With just the JSON string in the body it works correctly!
– hal9000
Nov 19 '18 at 22:50
That was it! I was being rather stupid and returning VERBOSE and HEADER in libcurl get call. With just the JSON string in the body it works correctly!
– hal9000
Nov 19 '18 at 22:50
Have you ever played around with pulling out the the json key value pairs? Trying to figure out a way to iterate them into a standard map.
– hal9000
Nov 19 '18 at 22:51
Have you ever played around with pulling out the the json key value pairs? Trying to figure out a way to iterate them into a standard map.
– hal9000
Nov 19 '18 at 22:51
Great! Sorry to say, I have very little experience with rapidjson. I settled with JSON for Modern C++ eventually but I don't know how to do that there either. I've only been doing very basic stuff with it.
– Ted Lyngmo
Nov 19 '18 at 23:22
Great! Sorry to say, I have very little experience with rapidjson. I settled with JSON for Modern C++ eventually but I don't know how to do that there either. I've only been doing very basic stuff with it.
– Ted Lyngmo
Nov 19 '18 at 23:22
add a comment |
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RapidJSON allows you to check what the error is. Have you tried looking at the specific error code? The list is pretty extensive: rapidjson.org/md_doc_dom.html#ParseError
– ahota
Nov 19 '18 at 21:35
As far as the map is concerned, I've been working on something similar recently. The closest I found to a true JSON (and Python dictionary) is an
std::unordered_mapwith a key typestd::stringand a value type ofstd::variant<>, where the variant could be int, float, string, vector, etc.std::variantrequires C++17, though.– ahota
Nov 19 '18 at 21:39
@ahota the error says "invalid values". Although i suspect this could be because I am converting a standard string to const char*? Also i am restricted to cpp 11
– hal9000
Nov 19 '18 at 21:47