What is this thing in my STRUCT?
-
Hi Qt's,
I did the search and even reread chapter 8 of "The C++ Programming Language".
So I am trying to get up to speed on Qt and C++ and came across this little gem in an example:
//Structure for the response to the QUERY_EXTENDED_INFO command union ExtendedQueryInfo { unsigned char command; struct { unsigned char command; uint16_t bootloaderVersion; uint16_t applicationVersion; uint32_t signatureAddress; uint16_t signatureValue; uint32_t erasePageSize; unsigned char config1LMask; unsigned char config1HMask; unsigned char config2LMask; unsigned char config2HMask; unsigned char config3LMask; unsigned char config3HMask; unsigned char config4LMask; unsigned char config4HMask; unsigned char config5LMask; unsigned char config5HMask; unsigned char config6LMask; unsigned char config6HMask; unsigned char config7LMask; unsigned char config7HMask; unsigned char pad[USB_PACKET_SIZE_WITH_REPORT_ID - 29]; }PIC18; struct { unsigned char command; uint16_t bootloaderVersion; uint16_t applicationVersion; uint32_t signatureAddress; uint16_t signatureValue; uint32_t erasePageSize; uint16_t configxxMask... unsigned char pad[USB_PACKET_SIZE_WITH_REPORT_ID - XX]; }PIC24; };
Can someone explain the purpose of the PIC18 and PIC24 at the end of those 2 struct's?
Regards,
Chris
-
struct { unsigned char command; uint16_t bootloaderVersion; uint16_t applicationVersion; uint32_t signatureAddress; uint16_t signatureValue; uint32_t erasePageSize; uint16_t configxxMask... unsigned char pad[USB_PACKET_SIZE_WITH_REPORT_ID - XX]; } PIC24;
This defines an anonymous structure and declares a variable of this type named "PIC24" .
-
Hi and welcome to devnet,
That's rather a general C/C++ question unrelated to Qt but anyway, here you have the complete explanation
@SGaist thanks for the warm reception.
Thanks for the link. I have written firmware in C and some desktop apps in C#. And since I'm no expert in either, moving to C++ in Qt it becomes a little unclear what code related items are strictly C++ and which are part of the Qt IDE.
I hope to get it sorted without committing to many forum faux pas.
Best regards,
Chris
-
Don't worry for that, you won't be eaten ;)
I've forgotten that there's also the C++ Guru sub forum when you have questions that are more C++ oriented
Happy coding !