0

这是json形式： 

{"simpleChannels":{"item":[{"channelID":4248,"majorChannelNumber":22,"minorChannelNumber":0,"channelType":"SLL","simpleSchedules":[],"channelKey":"4248_1343210400000","shortName":"KWHY","longName":"A3 Los Angeles 22 KWHY IND","networkAffiliation":["Independent"],"logoID":0,"authCode":"FS","engChlFlag":false,"hasMirror":true,"pgSource":"ACTIVE","hdChlFlag":true,"adultChlFlag":false,"vodProviderId":0,"blackOut":false,"liveStreaming":"N"}]}}

这是尝试解析和提取值的代码：
json 是包含上述内容的 std::string ： 

    m_guideSlice.Parse<0>(json.c_str());
    rapidjson::Value& simpleChannels = m_guideSlice["simpleChannels"];
    if (simpleChannels.IsObject()) {
        SYSLOG_CRITICAL("simpleChannels.IsObject() == true\n");
        rapidjson::Value& channelArray= simpleChannels["item"];
        if (channelArray.IsArray()) {
            SYSLOG_CRITICAL("channelArray.IsArray() == true\n");
            rapidjson::Value& channel = channelArray[0u];
            if (channel.IsObject()) {
                SYSLOG_CRITICAL("channel.isObject() == true\n");
                rapidjson::Value& channelID = channel["channelID"];
                if (channelID.IsInt()) {
                    SYSLOG_CRITICAL("channelID.IsInt() == true, channelID= %d\n", channelID.GetInt());
                }
                else {
                    SYSLOG_CRITICAL("channelID.IsInt() == false, type= %X\n", channelID.GetType());                     
                }
                rapidjson::Value& majorChannelNumber = channel["majorChannelNumber"];
                if (majorChannelNumber.IsInt()) {
                    SYSLOG_CRITICAL("majorChannelNumber.IsInt() == true, majorChannelNumber= %d\n", majorChannelNumber.GetInt());
                }
                else {
                    SYSLOG_CRITICAL("majorChannelNumber.IsInt() == false, type= %X\n", majorChannelNumber.GetType());                       
                }
                rapidjson::Value& channelType = channel["channelType"];
                if (channelType.IsString()) {
                    SYSLOG_CRITICAL("channelType.IsString() == true\n")
                    SYSLOG_CRITICAL("channelType = %s\n", channelType.GetString());
                }
                else {
                    SYSLOG_CRITICAL("channelType.IsString() == false, type= %X\n", channelType.GetType());
                }
                rapidjson::Value& shortName = channel["shortName"];
                if (channelType.IsString()) {
                    SYSLOG_CRITICAL("shortName.IsString() == true\n")
                    SYSLOG_CRITICAL("shortName = %s\n", shortName.GetString());
                }
                else {
                    SYSLOG_CRITICAL("shortName.IsString() == false, type= %X\n", shortName.GetType());
                }
            }
            else {
                SYSLOG_CRITICAL("channel.IsObject() == false, type= %X\n", channel.GetType());
            }
        }
        else {
            SYSLOG_CRITICAL("channelArray.IsArray() == false, type= %X\n", channelArray.GetType());             
        }
    }
    else {
        SYSLOG_CRITICAL("simpleChannels.IsObject() == false, type= %X\n", simpleChannels.GetType());
    }

这是从 syslog 中提取的输出： 

May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]:   (PgwsIngest.cpp:78) getGuide(): simpleChannels.IsObject() == true 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:81) getGuide(): channelArray.IsArray() == true 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:84) getGuide(): channel.isObject() == true 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:87) getGuide(): channelID.IsInt() == true, channelID= 0 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:94) getGuide(): majorChannelNumber.IsInt() == true, majorChannelNumber= 0 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:101) getGuide(): channelType.IsString() == true 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:102) getGuide(): channelType = SLL 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:109) getGuide(): shortName.IsString() == true 
May 19 01:25:38   [BSP] [30578]: [PGWS-GEN LOG_CRIT tid:30744 pthr:0x7033e4f0]: (PgwsIngest.cpp:110) getGuide(): shortName = KWHY

char json 值被正确提取，但 int 值始终为 0。我是第一次 rapidjson 用户，所以我确定我正在犯一个简单的错误，但我没有立即看到它。

谢谢大家，

顺便说一句，json 表单通过http://www.freeformatter.com/json-validator.html所以我认为它是正确的。无论如何，它是机器生成的。

4

2 回答 2

1

我在一个大端机器上，编译器不能传递适当的标志来指示字节顺序。
显式设置标志：

定义 RAPIDJSON_ENDIAN RAPIDJSON_BIGENDIAN

在 rapidsjon.h 中应该解决这个问题。

于 2013-05-20T06:13:35.627 回答
0

我们在此拉取请求中改进了字节序检测。

它将检测更多平台定义的宏。如果无法成功检测，则会生成预处理器错误，然后您必须定义RAPIDJSON_ENDIAN.

您可以将此差异合并到您的版本中，看看它是否有帮助。

于 2014-08-13T15:28:00.710 回答