Question

I am trying to send 2 request one by one at same time. My code is following (this is example code):

QTcpSocket client;
...
client->write(block);
client->write(block);

Problem is following. Server receives only first request. There is no second request. I sniffed using wireshark and see that there is no second request in tcp packets.

What must i do to send many requests via QTcpSocket one by one?

UPD: I inserted qDebug() << this->bytesAvailable() << "bytes"; to server in readyRead() and qDebug() << this->bytesToWrite(); after each client->write(block); in client. Also, I added this to client:

connect(this, SIGNAL(bytesWritten(qint64)), this, SLOT(bytesWritten(qint64)));

void Connection::bytesWritten(qint64 count)
{
    qDebug() << count << "bytes written";
}

I send ORDER_STATUS_GET_LIST constant in first request and ORDER_GET_LIST in second. I added data output in server. I received first command.

There is output listing:

Client:

Sending ORDER_STATUS_GET_LIST 
11 bytes to write 
Sending ORDER_GET_LIST 
68 bytes to write
68 bytes written

Server:

68 bytes 
ORDER_STATUS_GET_LIST received

Answer 1

According to the documentation, you need to flush() the socket IF you don’t return to the event loop between multiple writes.

The proper solution would be to buffer your blocks into, e.g., a QByteArray and send the buffer at once.

QTcpSocket client;
QByteArray buffer;
...
buffer << block;
buffer << block;
client->write(buffer);