简单的ini文件解析

int GetKeyVal(const string strCfg, const string strKey, string& strVal)
{
    int nRet = em_succ;
    if (strKey.length() <= 0)
    {
        return em_err_param;
    }
    
    FILE* fp = fopen(strCfg.c_str(), "rt");        
    if (NULL == fp)
    {
        return em_err_open_file;
    }
    
    char szReadLine[ROLE_DEF_MAX_LINE_LEN] = {0};    
    memset(szReadLine, 0, ROLE_DEF_MAX_LINE_LEN);
    nRet = em_err_no_result;
        
    while (EOF != (fscanf(fp, "%[^\n]", szReadLine)))
    {
        fgetc(fp);//read '\n'
        string strLine = szReadLine;
        memset(szReadLine, 0, sizeof(szReadLine));
        
        vector<string> vtSec = SplitString(strLine, "=");
        if ((vtSec.size() <= 1) || (vtSec.size() > 2))
        {
            continue;
        }
        else if (strKey == vtSec[0])
        {
            strVal = vtSec[1];
            nRet = em_succ;
            break;
        }
    }    
    
    if (NULL != fp)
    {
        fclose(fp);
        fp = NULL;
    }
    
    return nRet;
}