[Qt-interest] how to output a user defined struct data to datastream?

[Vincent Cai]

Hi,

        So in the way, if I want to output an big array: quint16 dataArray[1000][1000] to datastream,
        I have to output the dataArray items one by one with a for loop?
        If yes, then the efficiency will be very poor, right?

-----Original Message-----
From: qt-interest-bounces+wcai=cypress.com at qt.nokia.com [mailto:qt-interest-bounces+wcai=cypress.com at qt.nokia.com] On Behalf Of Vincent Cai
Sent: 2011年10月13日 17:09
To: Andre Haupt
Cc: Qt-interest
Subject: Re: [Qt-interest] how to output a user defined struct data to datastream?

You are right, thanks so much!

-----Original Message-----
From: Andre Haupt [mailto:andre at bitwigglers.org]
Sent: 2011年10月13日 17:05
To: Vincent Cai
Cc: Andre Haupt; Samuel Gaist; Qt-interest
Subject: Re: [Qt-interest] how to output a user defined struct data to datastream?

On Thu, Oct 13, 2011 at 04:49:27AM -0400, Vincent Cai wrote:
> Sorry, but I think the endian is controlled by QDataStream which is platform independent, am I wrong?

This is correct, as long as you use it the right way ;-)
You had a 16 bit member in your struct, but in your sample you passed
that member bytewise to QDataStream.

So writing to the stream on a little endian platform and then reading on
big endian would have swapped the bytes of your 16 bit member.

regards,

Andre

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