Brew Interview Question:

When reading from a socket the phone reads whatever it can in one go, while the emulator reads large packets in chunks. Why?

Submitted by: Administrator

This is a limitation of the phone.

Program should call ISOCKET_Readable() to be informed when more data can be read from the stream. The callback routine registered by ISOCKET_Readable() will be invoked whenever data becomes available---you can usually call ISOCKET_Read() at this point. Continue calling ISOCKET_Readable() for as long as your program expects more data.

rv = ISOCKET_Read(piSock, (byte *)szBuf, sizeof(szBuf));

if (rv == AEE_NET_WOULDBLOCK) {
// WOULDBLOCK => no more data available at the moment
// Register the callback to read the data later.
ISOCKET_Readable(piSock, CommonReadCB, (void*)pMe);
return;
}
else if (rv == AEE_NET_ERROR) {
// error reading from socket
ReleaseNetAndSocket (pMe);
}
else if (rv > 0) {
// rv bytes of data has been read from the socket into
// szBuf

// Read remaining data
ISOCKET_Readable(piSock, CommonReadCB, (void*)pMe);
}
else { // rv == 0
// There is no more data to be received.
// The peer has shut down the connection.
ReleaseNetAndSocket (pMe);
}
Submitted by: Administrator