how to print elements of the struct in C++/QT?

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I want to print TPCANMsg.ID and DATA of following struct

C++

typedef struct tagTPCANMsg
{
    DWORD             ID;      // 11/29-bit message identifier
    TPCANMessageType  MSGTYPE; // Type of the message
    BYTE              LEN;     // Data Length Code of the message (0..8)
    BYTE              DATA[8]; // Data of the message (DATA[0]..DATA[7])
} TPCANMsg;

Any idea?

Posted 3-Nov-15 21:11pm

Ramiien

Updated 3-Nov-15 22:19pm

Richard MacCutchan

v2

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CPallini 4-Nov-15 3:21am

What is your doubt?

Ramiien 4-Nov-15 3:29am

M idea was that structname.element is the way to print value. e.g cout << TPCANMsg.ID to print the ID of the CAN. but it is not working. i dont know why?

Richard MacCutchan 4-Nov-15 4:19am

What does "not working" mean? Please edit your question, show the code and explain exactly what is happening.

Jochen Arndt 4-Nov-15 4:19am

TPCANMsg is the type. You must use a variable of that type and can then access the elements. Example:

TPCANMsg msg;
CAN_Read(handle, &msg, &timeStamp);
cout << msg.ID;

[no name] 4-Nov-15 4:44am

No it won't work because it won't compile. We need your actual code snippet to understand your question but Jochen Arndt has told you exactly how to do it.

CPallini 4-Nov-15 5:36am

"Is not working" is not working.

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KarstenK · Answer 1 · 2015-11-03T22:30:00

To print it you must understand what the values oft data types are representing. It is best to write converter function for that.

Blueprint-Example:

C++

const char*  TPCANMessageTypeToText( const TPCANMessageType* typ ) {
  if( * typ = 0x00 ) { //PCAN_MESSAGE_STANDARD
    return "The PCAN message is a CAN Standard Frame (11-bit identifier)";
  }
//all the rest
}

The value I have found here.