[Qt-interest] QTcpSocket Problem

[Tang Ke]

On 2010年01月20日 08:18, Dan Mills wrote:
> On Tue, 2010-01-19 at 18:11 -0500, Anthony Gabrielson wrote:
>
>    
>> -         Server appears to send out the entire file
>>
>> -         Client enters Editor::updateWidget() and successfully enters
>> in getFile (work.cpp)
>>
>> -         getFile correctly pulls in the first 35ish kb of data (I
>> have verified the files)
>>
>> -         At somepoint, in getFile’s while loop it appears that no
>> more bytes are available
>>      
> > From the QT4 documentation:
> "QTcpSocket works asynchronously and emits signals to report status
> changes and errors, just like QHttp and QFtp. It relies on the event
> loop to detect incoming data and to automatically flush outgoing data.
> You can write data to the socket using QTcpSocket::write(), and read
> data using QTcpSocket::read(). QTcpSocket represents two independent
> streams of data: one for reading and one for writing."
>
> The key thing is that the event loop is not being run while you sit and
> spin in the while loop.
>
> Try either using the waitFor... methods in QTcpSocket (which don't need
> an event loop) which will work but will freeze the GUI until the
> download completes, or rewrite using a slot to handle the data when it
> becomes available.
>
>    
waitForbytesWritten which don't need an event loop, and only write the 
data into buffer,but I found that if the io event join the event loop,

sometimes will not work,so I must flush do it youself.
> HTH.
>
> Regards, Dan.
>
>
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