c++算法使用json输出最终结果给java使用，于是，开始了json对象的组装之旅...
首先，对不同数据类型，封装不同的数据组装函数
/**
* 拼接int
*/std::string getKeyValue(std::string sKey, int iValue){ char szDoubleQutoes[] = "\""; char szColon[] = ":"; char szValue[50] = { 0 }; std::string strResult;
strResult.append(szDoubleQutoes);
strResult.append(sKey);
strResult.append(szDoubleQutoes);
strResult.append(szColon); sprintf(szValue, "%d", iValue);
strResult.append(szValue); return strResult;
}/**
* 拼接float，保留3位
*/std::string getKeyValue(std::string sKey, float fValue){ char szDoubleQutoes[] = "\""; char szColon[] = ":"; char szValue[50] = { 0 }; std::string strResult;
strResult.append(szDoubleQutoes);
strResult.append(sKey);
strResult.append(szDoubleQutoes);
strResult.append(szColon); sprintf(szValue, "%0.3f", fValue);
strResult.append(szValue); return strResult;
}/**
* 拼接string
*/std::string getKeyValue(std::string sKey, std::string sValue){ char szDoubleQutoes[] = "\""; char szColon[] = ":"; std::string strResult;
strResult.append(szDoubleQutoes);
strResult.append(sKey);
strResult.append(szDoubleQutoes);
strResult.append(szColon);
strResult.append(szDoubleQutoes);
strResult.append(sValue);
strResult.append(szDoubleQutoes); return strResult;
}/**
* 拼接object
*/std::string getKeyValueObject(std::string sKey, std::string sObject){ char szDoubleQutoes[] = "\""; char szColon[] = ":"; std::string strResult;
strResult.append(szDoubleQutoes);
strResult.append(sKey);
strResult.append(szDoubleQutoes);
strResult.append(szColon);
strResult.append(sObject); return strResult;
}/**
* 拼接array
*/std::string getKeyValueArray(std::string sKey, std::string sArray){ char szDoubleQutoes[] = "\""; char szColon[] = ":"; std::string strResult;
strResult.append(szDoubleQutoes);
strResult.append(sKey);
strResult.append(szDoubleQutoes);
strResult.append(szColon);
strResult.append("[");
strResult.append(sArray);
strResult.append("]"); return strResult;
}调用，及最终json组装，增加 { }及，分隔符
int main() { int value1 = 1; float value2 = 1.0f; std::string strJsonResult("{");
strJsonResult.append(getKeyValue("key1", value1));
strJsonResult.append(",");
strJsonResult.append(getKeyValue("key2", value2));
strJsonResult.append("}");
}
作者：ThinkinLiu
链接：https://www.jianshu.com/p/4022b807c6e7
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