CODEWITHSUNDEEP
cpointersstruct
Vincenzo Cristiano
Vincenzo Cristiano

Reputation: 87

Dereferencing pointer to incomplete type while using nested structs

I'm using a library developed by Xsens in order to use in my project their mti710-GNSS-INS. This library has the following structures (inside the headers xbusmessage.h xbusparser.h)

struct XbusParser {
    struct XbusParserCallback callbacks;
    struct XbusMessage currentMessage;
    uint16_t payloadReceived;
    uint8_t checksum;
    enum XbusParserState state;
};

struct XbusParserCallback{
    void* (*allocateBuffer)(size_t bufSize);
    void (*deallocateBuffer)(void const* buffer);
    void (*handleMessage)(struct XbusMessage const* message);
};

struct XbusMessage{
    enum XsMessageId mid;
    uint16_t length;
    void* data;
};

In my code, I have a struct XbusParser* xSensBusParser; as a global variable. Every time I try to access any field of the "parser struct" I get the following error: error: dereferencing pointer to incomplete type. Below an example code:

bool mti710WakeUp(struct XbusParser* parser, const uint32_t timeout_ms){

    mti710ReadData(parser, sizeof(struct XbusMessage));
    blockingDelay(timeout_ms, TIME_MS); 
    return parser->currentMessage.mid == XMID_Wakeup ? true : false;
}

Note that in mti710ReadData there is a UART Read function that fills a buffer and then a parsing function that changes the parser fields according to the received buffer.

Upvotes: 0

Views: 73

Answers (1)

Vincenzo Cristiano
Vincenzo Cristiano

Reputation: 87

As suggested by @Lundin in the comments above, there is a hidden struct definition in xbusparser.c while in the related header file there is only a

struct XbusParser;

So I moved the definition from the .c to the .h file and it works well.

Regards.

Upvotes: 0

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