how to receive a big data by socket?

[lmyuanhang]

how to receive a big data by socket?

i want receive a big data by socke, about 50K.

in socetReader

void CSocketsReader::RunL()
{
// Active object request complete handler
switch ( iStatus.Int() )
{
case KErrNone:
// Character has been read from socket
//TBuf8<512> iBuffer;
iEngineNotifier.ResponseReceived( iBuffer );
if(iBuffer'data is not enough)
{
iSocket.RecvOneOrMore( iBuffer, 0, iStatus, iDummyLength );
}
break;
case KErrDisconnected:

break;
default:

break;
}
}


is it can do it ?
thanks !!

[wizard_hu_]

In its current form it will not work (RecvOneOrMore overwrites the buffer, and SetActive is also missing). Otherwise yes, it is normal to RecvOneOrMore multiple times, and to collect the data fragments into an other buffer (you can use TBuf8 if you know the desired length in build-time, but HBufC8 or CBufFlat can be useful too), until the accumulated length meets your expectations.

[lmyuanhang]

In its current form it will not work (RecvOneOrMore overwrites the buffer, and SetActive is also missing). Otherwise yes, it is normal to RecvOneOrMore multiple times, and to collect the data fragments into an other buffer (you can use TBuf8 if you know the desired length in build-time, but HBufC8 or CBufFlat can be useful too), until the accumulated length meets your expectations.

thanks , what is the iDummyLength effect?
can I appoint the amount of the data, once time receive?

[wizard_hu_]

It is a mandatory argument of RecvOneOrMore, it gives you the amount of received data. Since iBuffer.Length also tells you that, it is rarely useful. But RecvOneOrMore needs it, and it should be a member variable.

[lmyuanhang]

It is a mandatory argument of RecvOneOrMore, it gives you the amount of received data. Since iBuffer.Length also tells you that, it is rarely useful. But RecvOneOrMore needs it, and it should be a member variable.

HI, wizard_hu_

my english is not enough good.

the data like

data head 1B
date length 2B
date content 5K

in my CSocketReader

int receiveLength = 0;
int totallength = 0;
TBuf<512> iBuffer;
iBuffer.Zero(); //yh
iSocket.RecvOneOrMore (iBuffer, 0, iStatus, iDummyLength);

in
void RunL()
{
if( totallength == 0 )
{
parse (iBuffer) //get totallength by the date length 2B
receiveLength = iBuffer.Length();
}
else
{
receiveLength += iBuffer.Length();
}

if(receiveLength >= totallength )
{
receiveLength = 0;
totallength = 0;
}
else
{
iSocket.RecvOneOrMore (iBuffer, 0, iStatus, iDummyLength);
setActive();
}
}

by the cod can i get the all data ?
when the data is bigger than 512. i get the by the date length 2B
is not the really data length .
how can i do it .thanks!!!!!!!!!!!

[wizard_hu_]

TBuf8<512>+RecvOneOrMore = receive some (one or more, up to 512) bytes, and complete as soon as possible
TBuf8<512>+Read = receive 512 bytes

[wizard_hu_]

What you can do is this:

// .h
TBuf<512> iBuffer;
CBufFlat *iData;

// .cpp

RunL()
{
    if(iStatus==KErrNone)
    {
        iData->InsertL(iData->Size(),iBuffer);
        if(iData->Size()>=3) // header and length field is ready
        {
            TPtr8 data(iData>Ptr(0));
            TUint8 head1B=data[0];
            TUint16 length2B=256*data[2]+data[1];
            if(iData->Size()>=length2B+3)
            {
                // you have the complete data in "data.Mid(3,length2B)"
            }
            else RecvMore();
        }
        else RecvMore();
    }
}

RecvMore()
{
    iSocket.RecvOneOrMore(iBuffer,0,iStatus,iLen);
    SetActive();
}