c++：json字符串拼接，json對象組裝

c++算法使用json輸出最終結果給java使用，於是，開始了json對象的組裝之旅...

首先，對不同數據類型，封裝不同的數據組裝函數

 

/**
 * 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;
}

調用，及最終json組裝，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("}");
}