rapidJSON and UNICODE in VisualStudio 2013

Question

I came across a problem I am not sure how to solve. Here is my code.

#include "rapidjson/write.h"
#include "rapidjson/stringbuffer.h"

...

void WriteResultToJSON()
{
  CHAR a[] = "a";
  TCHAR b[] = _T("b");
  WCHAR c[] = L"c";

  StringBuffer s;
  Writer<StringBuffer> writer(s);
  writer.StartObject();
  writer.String("A:");
  writer.String(a);
  writer.String("B");
  writer.String(b);
  writer.String("C");
  writer.String(c);
  write.EndObject();
  printf(s.GetString());
}

When the project character set value is "Use Unicode Character Set", I am not able to compile. Only when it is set to "Use Multi-Byte Character Set".

Error says:

no instance of overloaded function "rapidjson::Writter<OutputStream, SourceEncoding, Target Encoding, StackAllocator>::String [with OutputStream=rapidjson::StringBuffer, SourceEncoding=rapidjson::UTF8<char>,TargetEncoding=rapidjson::UTF8<char>, StackAllocator=rapidjson::CtrAllocator]" matches the argument list
 argument types are (TCHAR  [2])
 object type is: rapidjson::Writter<rapidjson::StringBuffer, rapidjson::UTF8<char>, rapidjson::UTF8<char>, rapidjson::CrtAllocator>

I got a bad feeling that rapidjson supports only utf8 and it wont work with my current project which is all in utf16, or is there a way how to use it when character set is set to unicode?

Thank you

yary

Answer 1

If you look at the various string methods of the Writer class, they all expect const SourceEncoding::Ch* as input. By default, SourceEncoding is rapidjson::UTF8 and Ch is char. To accept wchar_t* input, you have to specify rapidjson::UTF16 (or rapidjson::UTF16LE) as the SourceEncoding, eg:

void WriteResultToJSON()
{
    CHAR a[] = "a";
    TCHAR b[] = TEXT("b");
    WCHAR c[] = L"c";

    StringBuffer s;
    Writer< StringBuffer > writerUTF8(s); // UTF-8 input
    Writer< StringBuffer, UTF16<> > writerUTF16(s); // UTF-16 input

    writerUTF8.StartObject();
    writerUTF8.String("A:");
    writerUTF8.String(a);
    writerUTF8.String("B");

    #ifdef UNICODE
    writerUTF16.String(b);
    #else
    writerUTF8.String(b);
    #endif

    writerUTF8.String("C");
    writerUTF16.String(c);

    writerUTF8.EndObject();
    printf(s.GetString());
}