jsoncpp如何获取大数（1亿亿）

kaede_1

之前用jsoncpp解释json串，主要用asInt(),asString()两个函数来获取数据，可是今天遇到一个1亿亿的数，无法获取，请问如何处理？
报错：Real out of unsigned integer range

难道改用其他库？

cokeboL

数据来源方写成字符串，得到字符串，用大数库

fender0107401

这就算大了，不会吧。

kaede_1

回复 2# cokeboL


    不是一个部门，这个有点难度。。。

kaede_1

fender0107401 发表于 2015-11-11 08:49
这就算大了，不会吧。

。。。。请问用jsoncpp怎么处理？

hellioncu

  Int asInt() const;
  UInt asUInt() const;
#if defined(JSON_HAS_INT64)
  Int64 asInt64() const;
  UInt64 asUInt64() const;
#endif // if defined(JSON_HAS_INT64)
  LargestInt asLargestInt() const;
  LargestUInt asLargestUInt() const;

cokeboL

     

kaede_1

hellioncu 发表于 2015-11-11 09:48
Int asInt() const;
  UInt asUInt() const;
#if defined(JSON_HAS_INT64)

。。。你用的是哪个版本？？
我的是jsoncpp-src-0.5.0，value.h文件中只有
      int compare( const Value &other );

      const char *asCString() const;
      std::string asString() const;
# ifdef JSON_USE_CPPTL
      CppTL::ConstString asConstString() const;
# endif
      Int asInt() const;
      UInt asUInt() const;
      double asDouble() const;
      bool asBool() const;

hellioncu

kaede_1 发表于 2015-11-11 13:19
。。。你用的是哪个版本？？
我的是jsoncpp-src-0.5.0，value.h文件中只有
      int compare( const ...

刚下的，看样子是新增加的特性

  New in JsonCpp 0.6.0:
  ---------------------

* Compilation

  - LD_LIBRARY_PATH and LIBRARY_PATH environment variables are now
    propagated to the build environment as this is required for some
    compiler installation.

  - Added support for Microsoft Visual Studio 2008 (bug #2930462):
    The platform "msvc90" has been added.

    Notes: you need to setup the environment by running vcvars32.bat
    (e.g. MSVC 2008 command prompt in start menu) before running scons.
   
  - Added support for amalgamated source and header generation (a la sqlite).
    Refer to README.md section "Generating amalgamated source and header"
    for detail.
   
* Value

  - Removed experimental ValueAllocator, it caused static
    initialization/destruction order issues (bug #2934500).
    The DefaultValueAllocator has been inlined in code.
   
  - Added support for 64 bits integer:
  
    Types Json::Int64 and Json::UInt64 have been added. They are aliased
        to 64 bits integers on system that support them (based on __int64 on
        Microsoft Visual Studio platform, and long long on other platforms).
       
        Types Json::LargestInt and Json::LargestUInt have been added. They are
        aliased to the largest integer type supported:
        either Json::Int/Json::UInt or Json::Int64/Json::UInt64 respectively.
       
        Json::Value::asInt() and Json::Value::asUInt() still returns plain
        "int" based types, but asserts if an attempt is made to retrieve
        a 64 bits value that can not represented as the return type.
       
        Json::Value::asInt64() and Json::Value::asUInt64() have been added
        to obtain the 64 bits integer value.
       
        Json::Value::asLargestInt() and Json::Value::asLargestUInt() returns
        the integer as a LargestInt/LargestUInt respectively. Those functions
        functions are typically used when implementing writer.
       
        The reader attempts to read number as 64 bits integer, and fall back
        to reading a double if the number is not in the range of 64 bits
        integer.
   
    Warning: Json::Value::asInt() and Json::Value::asUInt() now returns
    long long. This changes break code that was passing the return value
    to *printf() function.
  
    Support for 64 bits integer can be disabled by defining the macro
        JSON_NO_INT64 (uncomment it in json/config.h for example), though
        it should have no impact on existing usage.
   

kaede_1

果然，多谢

之前一时没有方法，直接字符串匹配了