c++基础(七）：字符串拼接，json对象组装

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("}");
}

原文：简书ThinkinLiu 博客: IT老五