c++ - 错误 : Cannot add two pointers

Question

它给出了关于这段代码的标题中的错误:

string DDateTime::date2OracleDate(DATE Date)
{
    string s;
    s="TO_DATE('" + DateFormat("%d/%m/%Y",Date) + "','dd/MM/YYYY')";
    return s;
}

我不明白这是怎么可能的，不涉及任何指针......

编辑:

string DDateTime::DateFormat(string sFormat,DATE Date)
{
    struct tm tmTemp;
    RipOf_AfxTmFromOleDate(Date, tmTemp);
    RipOf_AfxTmConvertToStandardFormat(tmTemp);
    char sFormatted[MAX_TIME_BUFFER_SIZE];
    strftime(sFormatted, MAX_TIME_BUFFER_SIZE, sFormat.c_str(), &tmTemp);
    return sFormatted;
}

Answer 1

以下应该工作得更好:

string DDateTime::date2OracleDate(DATE Date)
{
    string s = "TO_DATE('";
    s += DateFormat("%d/%m/%Y",Date);
    s += "','dd/MM/YYYY')";
    return s;
}