How to parse with rapidjson from std::string?

Question

How to parse with rapidjson from std::string ? I am trying like (json string is valid, I checked on jsonlint.com)

Document document;
char * writable = new char[contentString.size() + 1];
std::copy(contentString.begin(), contentString.end(), writable);
writable[contentString.size()] = '\0'; // don't forget the terminating 0
std::cout<<writable<<"\n";
if (document.Parse<0>(writable).HasParseError())
    return 1;

contentString is my json std::string, but when I start I always get error ( return 1). I tried also without size()+1 and '\0' but nothing (desperate measure programming). Can anyone help me ?

score 7 · Answer 1 · answered Apr 11 '14 at 10:23

7

Try this for parse std:: string

std::string str = "{ \"hello\" : \"world\" }";
copiedDocument.Parse<0>(str.c_str());

answered Apr 11 '14 at 10:23

Arvind Kanjariya

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score 5 · Answer 2 · answered Sep 24 '13 at 07:48

5

if contentString is std::string, just try

document.Parse<0>(contentString.c_str()).HasParseError()

if contentString is char *, just try

document.Parse<0>(contentString).HasParseError()

and you'd better post your original code snippet

answered Sep 24 '13 at 07:48

stefanie wang

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score 4 · Answer 3 · answered Mar 25 '13 at 16:10

4

Have you tried

if (document.Parse<0>(contentString.c_str()).HasParseError())
    return 1;

?

Because, from the documentation, I fail to see why you want anything "writable"...

answered Mar 25 '13 at 16:10

Daniel Frey

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I have tried that way at first, but error. Then I have started to change – Damir Mar 25 '13 at 16:11
1

In that case, please always post the obvious code, not the complicated version. And show us the contentString, please. – Daniel Frey Mar 25 '13 at 16:12

score 2 · Answer 4 · answered Mar 25 '13 at 16:16

Seems to me there is an error with the string you send json, You are using it correctly, I suggest you try sending it:

const char json[] = "{ \"hello\" : \"world\" }";

And see if it works, if so obviously it's a buffer problem.. you can continue from there I am sure

How to parse with rapidjson from std::string?

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