Question

我想创建一个名为wsm_info的新消息类型。

在此消息类型中，我想要包含一个车辆结构，如下所示：

struct vehicle{
   int vehicle_id;
   Coord vehicle_pos;
   float speed;
};

在静脉示例中，有一个名为prepareWSM的函数，它在BaseWaveApplLayer.h中声明。此函数是virtual WaveShortMessage*类型。

如果wsm_info来自WaveShortMessage，我就不需要为prepareWSM撰写并宣布新的wsm_info了，对吧？

那么我怎样才能将这条wsm_info讯息改为WaveShortMessage？

我试着在wsm_info.h：

中写这样的内容

class wsm_info : public WaveShortMessage

而不是之前写的：

class wsm_info : public ::omnetpp::cPacket

但我得到的错误如下：

cannot initialize a variable of type wsm_info * with an rvalue of type WaveShortMessage

我的msg_info的完整代码如下：

cplusplus {{
#include "veins/base/utils/Coord.h"
#include "veins/modules/messages/WaveShortMessage_m.h"
}}

class noncobject Coord;

class WaveShortMessage;

struct vehicle {
        int vehicle_id;
        Coord vehicle_pos;
        float speed;
    };

message wsm_info extends WaveShortMessage {
    //Version of the Wave Short Message
    int wsmVersion = 0;
    //Determine which security mechanism was used
    int securityType = 0;
    //Channel Number on which this packet was sent
    int channelNumber;
    //Data rate with which this packet was sent
    int dataRate = 1;
    //Power Level with which this packet was sent
    int priority = 3;
    //Unique number to identify the service
    int psid = 0;
    //Provider Service Context
    string psc = "Service with some Data";
    //Length of Wave Short Message
    int wsmLength;

    vehicle data;

    int senderAddress = 0;
    int recipientAddress = -1;
    int serial = 0;
    Coord senderPos;
    simtime_t timestamp = 0;
}

任何人都可以查看我的代码并指出我哪里出错了，为什么？谢谢！

Answer 1

如果我说得对，你想扩展你的wsm_info.msg，这是正确的吗？

根据THIS问题，您可以通过以下方式修改wsm_info.msg：

cplusplus {{
#include "veins/modules/messages/WaveShortMessage_m.h"
}}

class WaveShortMessage;

message wsm_info extends WaveShortMessage {
   int vehicle_id;
   Coord vehicle_pos;
   float speed;
}

Answer 2

msg_info.msg应包含以下内容：

cplusplus {{
#include "veins/modules/messages/WaveShortMessage_m.h"
}}

class noncobject Coord;

struct vehicle {
   int vehicle_id;
   Coord vehicle_pos;
   float speed;
};

class WaveShortMessage;

packet wsm_info extends WaveShortMessage {
    vehicle data;
}

您无法使用prepareWSM()，因为它会创建一个无法转换为WaveShortMessage的{{1}}对象。相反，您可以编写一个新方法，例如：

在wsm_info添加：

/veins/src/veins/modules/application/ieee80211p/BaseWaveApplLayer.h

并在类中添加声明：

#include "veins/modules/messages/wsm_info_m.h"

在wsm_info* prepare_wsm_info(std::string name, int dataLengthBits, t_channel channel, int priority, int rcvId, int serial=0);添加：
```
/veins/src/veins/modules/application/ieee80211p/BaseWaveApplLayer.cc
```
为了设置wsm_info* BaseWaveApplLayer::prepare_wsm_info(std::string name, int lengthBits, t_channel channel, int priority, int rcvId, int serial) { wsm_info* wsm = new wsm_info(name.c_str()); // ... content similar to prepareWSM() }结构，您只需编写：
```
vehicle
```

或者，您可以在wsm_info* info = prepare_wsm_info(/* parameters */); vehicle veh; veh.speed = 60; veh.vehicle_id = 3; // ... info->setData(veh);的定义中添加vehicle的参数。

Answer 3

哪里必须在哪个文件夹中声明wsm_info.msg？

创建WSM inherented消息

3 个答案: